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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 262. Отображено 168.
15-04-2014 дата публикации

Detecting a probe-off event in a measurement system

Номер: US0008696585B2
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

According to embodiments, techniques for detecting probe-off events are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, an energy decrease, a broadscale high-energy cone, a regular, repeated high-scale pattern, a low-scale information pattern; and a pulse band. The absence or presence of these and other characteristics, along with information about the characteristics, may be analyzed to detect a probe-off event. A confidence indicator may be calculated in connection with probe-off event detections and alarms may be generated when probe-off events occur.

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Номер записи: 1
11-06-2013 дата публикации

Systems and methods for normalizing a plethysmograph signal for improved feature analysis

Номер: US0008463347B2
Автор: James N. Watson, Rakesh Sethi, Robert Stoughton, Paul Stanley Addison, WATSON JAMES N, SETHI RAKESH, STOUGHTON ROBERT, ADDISON PAUL STANLEY, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES N, SETHI RAKESH, STOUGHTON ROBERT, ADDISON PAUL STANLEY, NELLCOR PURITAN BENNETT IE, WATSON JAMES N., NELLCOR PURITAN BENNETT IRELAND

The present disclosure relates to systems and methods for analyzing and normalizing signals, such as PPG signals, for use in patent monitoring. The PPG signal may be detected using a continuous non-invasive blood pressure monitoring system and the normalized signals may be used to determine whether a recalibration of the system should be performed.

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Номер записи: 2
07-06-2016 дата публикации

Simultaneous measurement of pulse and regional blood oxygen saturation

Номер: US0009357954B2
Автор: Youzhi Li, Bo Chen, Edward M. McKenna, Paul Stanley Addison, LI YOUZHI, CHEN BO, MCKENNA EDWARD M, ADDISON PAUL STANLEY, MCKENNA EDWARD M.
Принадлежит: Covidien LP, COVIDIEN LP

Methods and systems are provided that allow for the simultaneous calculation of pulse and regional blood oxygen saturation. An oximeter system that includes a sensor with a plurality of emitters and detectors may be used to calculate a pulse and/or regional blood oxygen saturation. A plurality of light signals may be emitted from light emitters. A first light signal may be received at a first light detector and a second light signal may be received at a second light detector. A pulse and/or regional blood oxygen saturation value may be calculated based on the received first and/or second light signals. The pulse and regional blood oxygen saturation values may be calculated substantially simultaneously. The calculated pulse and regional blood oxygen saturation values as well as other blood oxygen saturation values may be displayed simultaneously in a preconfigured portion of a display.

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Номер записи: 3
30-09-2010 дата публикации

SYSTEMS AND METHODS FOR MONITORING PAIN MANAGEMENT

Номер: US20100249544A1
Автор: Rakesh Sethi, Paul Stanley Addison, James N. Watson, Paul A. Edney, SETHI RAKESH, ADDISON PAUL STANLEY, WATSON JAMES N, EDNEY PAUL A, WATSON JAMES N., EDNEY PAUL A.
Принадлежит: Nellcor Puritan Bennett Ireland

The present disclosure relates to systems and methods for monitoring pain management using measurements of physiological parameters based on a PPG signal. A reference physiological parameter may be compared against a later measurement to identify a change in condition that may indicate a pain management problem.

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Номер записи: 4
01-10-2015 дата публикации

SYSTEMS AND METHODS FOR HIGH-PASS FILTERING A PHOTOPLETHYSMOGRAPH SIGNAL

Номер: US20150272507A1
Автор: James N. Watson, Paul Stanley Addison
Принадлежит:

According to embodiments, systems and methods for high-pass filtering a plethysmograph or photoplethysmograph (PPG) signal are disclosed. A sensor or probe may be used to obtain a plethysmograph or PPG signal from a subject. The sensor may be placed at any suitable location on the body, e.g., the forehead, finger, or toe. The PPG signal generated by the sensor may be high-pass filtered to disambiguate certain features of the PPG signal, including one or more characteristic points. The cut-off frequency for the high-pass filter may be greater than 0.75 Hz and less than 15 Hz. The cut-off frequency for the high-pass filter may be selected to be greater than the subject's computed pulse rate. These characteristic points on the filtered PPG signal may be used to compute non-invasive blood pressure measurements continuously or on a periodic basis. For example, the time difference between two or more characteristic points in a high-pass filtered version of the generated PPG signal may be computed. The time difference may be used to compute non-invasive blood pressure measurements continuously or on a periodic basis. 1. A system for high-pass filtering a photoplethysmograph (PPG) signal used for determining blood pressure value of a subject comprising:a sensor configured to generate the PPG signal; and receive the PPG signal from the sensor;', 'determine a pulse frequency value indicative of a pulse rate of the subject;', 'compute a cut-off frequency for a high-pass filter based at least in part on the pulse frequency value, such that the cut-off frequency is approximately equal to the sum of the pulse frequency value and a selected frequency value, wherein the selected frequency value is one of: 0.5 Hz, 1 Hz, 2 Hz, 3 Hz, 4 Hz, 5 Hz, 10 Hz, and 15 Hz;', 'generate a filtered PPG signal by applying the high-pass filter to the PPG signal; and', 'determine, based at least in part on the filtered PPG signal, the blood pressure value of the subject., 'a pulse oximeter configured ...

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Номер записи: 5
21-01-2010 дата публикации

SIGNAL PROCESSING SYSTEMS AND METHODS USING BASIS FUNCTIONS AND WAVELET TRANSFORMS

Номер: US20100014724A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland, Mervue

According to embodiments, systems and methods are provided that use continuous wavelet transforms and basis functions to provide an optimized system for the determination of physiological information. In an embodiment, the basis functions may be used to refine an area of interest in the signal in frequency or in time, and the continuous wavelet transform may be used to identify a maxima ridge in the scalogram at scales with characteristic frequencies proximal to the frequency or frequencies of interest. In another embodiment, a wavelet transform may be used to identify regions of a signal with the morphology of interest while basis functions may be used to focus on these regions to determine or filter information of interest. In yet another embodiment, basis functions and continuous wavelet transforms may be used concurrently and their results combined to form optimized information or a confidence metric for determined physiological information.

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Номер записи: 6
21-01-2010 дата публикации

Systems And Methods For Identifying Pulse Rates

Номер: US20100016693A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, techniques for using continuous wavelet transforms and spectral transforms to identify pulse rates from a photoplethysmographic (PPG) signal are disclosed. According to embodiments, candidate pulse rates of the PPG signal may be identified from a wavelet transformed PPG signal and a spectral transformed PPG signal. A pulse rate may be determined from the candidate pulse rates by selecting one of the candidate pulse rates or by combining the candidate pulse rates. According to embodiments, a spectral transform of a PPG signal may be performed to identify a frequency region associated with a pulse rate of the PPG signal. A continuous wavelet transform of the PPG signal at a scale corresponding to the identified frequency region may be performed to determine a pulse rate from the wavelet transformed signal.

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Номер записи: 7
30-12-2010 дата публикации

SYSTEMS AND METHODS FOR ASSESSING MEASUREMENTS IN PHYSIOLOGICAL MONITORING DEVICES

Номер: US20100332173A1
Автор: James N. Watson, Clark R. Baker, JR., Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland

Methods and systems are provided for deriving and analyzing shape metrics, including skewness metrics, from physiological signals and their derivatives to determine measurement quality, patient status and operating conditions of a physiological measurement device. Such determinations may be used for any number of functions, including indicating to a patient or care provider that the measurement quality is low or unacceptable, alerting a patient or care provider to a change in patient status, triggering or delaying a recalibration of a monitoring device, and adjusting the operating parameters of a monitoring system.

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Номер записи: 8
20-03-2014 дата публикации

SENSOR SYSTEM

Номер: US20140081098A1
Автор: Kristi Cohrs, James Nicholas Watson, Paul Stanley Addison, Mark Su, COHRS KRISTI, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, SU MARK
Принадлежит: Nellcor Puritan Bennett LLC

A sensor system is provided for determining a pulse transit time measurement of a patient. The sensor system includes a carotid sensor device configured to be positioned on a neck of the patient over a carotid artery of the patient. The carotid sensor device is configured to detect a plethysmograph waveform from the carotid artery. The sensor system includes a temporal sensor device that is operatively connected to the carotid sensor device. The temporal sensor device is configured to be positioned on the patient over a temporal artery of the patient. The temporal sensor device is configured to detect a plethysmograph waveform from the temporal artery. 1. A sensor system for determining a pulse transit time measurement of a patient , the sensor system comprising:a carotid sensor device configured to be positioned on a neck of the patient over a carotid artery of the patient, the carotid sensor device being configured to detect a plethysmograph waveform from the carotid artery; anda temporal sensor device operatively connected to the carotid sensor device, the temporal sensor device being configured to be positioned on the patient over a temporal artery of the patient, wherein the temporal sensor device is configured to detect a plethysmograph waveform from the temporal artery.2. The sensor system of claim 1 , further comprising a pulse transit time determination module operatively connected to the carotid sensor device and the temporal sensor device claim 1 , the pulse transit time determination module being configured to determine the pulse transit time measurement based claim 1 , at least in part claim 1 , on the plethysmograph waveforms from the carotid and temporal arteries.3. The sensor system of claim 1 , wherein the temporal sensor device comprises a housing and a sensor held by the housing claim 1 , the sensor being configured to detect the plethysmograph waveform from the temporal artery claim 1 , the housing defining an ear clip that is configured to be ...

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Номер записи: 9
23-10-2014 дата публикации

System and method for displaying fluid responsivenss predictors

Номер: US20140316287A1
Автор: James Nicholas Watson, Paul Stanley Addison, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY
Принадлежит: COVIDIEN LP

Embodiments provide systems and methods for displaying a fluid responsiveness predictor (FRP) based on an analysis a physiological signal detected by a physiological sensor applied to a patient. A method may include detecting the signal of the patient with the physiological sensor, determining an FRP with a FRP determination module, wherein the determining operation comprises analyzing at least one characteristic of the physiological signal over time to determine the FRP, receiving a report request to report the FRP at a requested time through a user interface, generating a reported FRP in relation to the requested time using the FRP determination module, and displaying the reported FRP on a display. The displaying operation may include displaying the FRP using at least one graphic representation. 1. A method for displaying a fluid responsiveness predictor (FRP) based on an analysis of one or more physiological signals , the method comprising:receiving a physiological signal of the patient;determining an FRP, including analyzing at least one characteristic of the physiological signal over time to determine the FRP;receiving through a user interface a request to report the FRP at a requested time;generating a reported FRP; anddisplaying the reported FRP on a display until a cease report input is received through the user interface or until a defined end time for a reported FRP, wherein displaying comprises displaying the FRP using at least one graphic representation.2. The method of claim 1 , further comprising refraining from displaying the FRP in the absence of a received user request.3. The method of claim 1 , wherein the reported FRP is based on a considered time period that extends from an initial time to at least the requested time.4. The method of claim 1 , wherein generating the reported FRP comprises discarding a noisy portion of the physiological signal.5. The method of claim 1 , wherein generating the reported FRP comprises generating an average of the FRP ...

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Номер записи: 10
24-09-2015 дата публикации

SYSTEM AND METHOD FOR DETECTING FLUID RESPONSIVENESS OF A PATIENT

Номер: US20150265196A1
Автор: Mark Su, James Nicholas Watson, Paul Stanley Addison
Принадлежит:

A system is configured to determine a fluid responsiveness index of a patient from a physiological signal. The system may include a sensor configured to be secured to an anatomical portion of the patient, and a monitor operatively connected to the sensor. The sensor is configured to sense a physiological characteristic of the patient. The monitor is configured to receive a physiological signal from the sensor. The monitor may include an index-determining module configured to determine the fluid responsiveness index through formation of a ratio of one or both of amplitude or frequency modulation of the physiological signal to baseline modulation of the physiological signal. 1. A medical monitor for determining a fluid responsiveness index of a subject , the monitor comprising:an electrical input to receive a physiological signal from a sensor; determine a value indicative of fluid responsiveness based on modulations of the physiological signal;', 'determine a value indicative of changes in vascular tone of the subject based on one or more metrics of the physiological signal; and', 'determine a fluid responsiveness index of the subject based on the value indicative of fluid responsiveness and the value indicative of changes in vascular tone., 'a processor configured to2. The monitor of claim 1 , wherein the one or more metrics comprise a relative amplitude ratio of the physiological signal.3. The monitor of claim 1 , wherein the one or more metrics comprise a width of at least one primary peak of the physiological signal.4. The monitor of claim 1 , wherein the one or more metrics comprise a time difference between at least one primary peak of the physiological signal and a trailing peak of the physiological signal.5. The monitor of claim 1 , wherein the one or more metrics comprise a pleth modulation ratio of the physiological signal.6. The monitor of claim 1 , wherein the processor is configured to determine the fluid responsiveness index of the subject by ...

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Номер записи: 11
07-06-2022 дата публикации

Combined physiological sensor systems and methods

Номер: US0011350830B2
Автор: Edward M. McKenna, Bo Chen, Youzhi Li, Paul Stanley Addison
Принадлежит: COVIDIEN LP, Covidien LP

A combined physiological sensor and methods for detecting one or more physiological characteristics of a subject are provided. The combined sensor (e.g., a forehead sensor) may be used to detect and/or calculate at least one of a pulse blood oxygen saturation level, a regional blood oxygen saturation level, a respiration rate, blood pressure, an electrical physiological signal (EPS), a pulse transit time (PTT), body temperature associated with the subject, a depth of consciousness (DOC) measurement, any other suitable physiological parameter, and any suitable combination thereof. The combined sensor may include a variety of individual sensors, such as electrodes, optical detectors, optical emitters, temperature sensors, and/or other suitable sensors. The sensors may be advantageously positioned in accordance with a number of different geometries. The combined sensor may also be coupled to a monitoring device, which may receive and/or process one or more output signals from the individual ...

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Номер записи: 12
07-06-2022 дата публикации

Systems and methods for video-based monitoring of vital signs

Номер: US0011350850B2
Автор: Dominique Jacquel, Paul Stanley Addison, David Foo
Принадлежит: Covidien, LP, Covidien LP

The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals. Examples include flood fill methods and skin tone filtering methods.

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Номер записи: 13
31-12-2009 дата публикации

SYSTEMS AND METHODS FOR ARTIFACT DETECTION IN SIGNALS

Номер: US20090326871A1
Автор: James Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, a method and system for artifact detection in signals is disclosed. The artifacts may take the form of movement artifacts in physiological (e.g., pulse oximetry) signals. Artifacts in the wavelet space of the physiological signal may be removed, replaced, ignored, filtered, or otherwise modified by determining the energy within a predefined moving area of the wavelet scalogram, comparing the determined energy within the predefined moving area of the wavelet scalogram to a threshold value, and masking at least one area of artifact in the wavelet scalogram based, at least in part, on the comparison. From the enhanced signal, physiological parameters, for example, respiration, respiratory effort, pulse, and oxygen saturation, may be more reliably and accurately derived or computed.

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Номер записи: 14
21-01-2010 дата публикации

Signal Processing Systems and Methods for Analyzing Multiparameter Spaces to Determine Physiological States

Номер: US20100016680A1
Автор: Paul Stanley Addison, James Nicholas Watson, Edward M. McKenna
Принадлежит: Nellcor Puritan Bennett Ireland

The present disclosure relates to signal processing systems and methods, and more particularly, to systems and methods for analyzing multiparameter spaces to determine changes in a physiological state. In embodiments, a first signal and a second signal may be obtained, from which a first plurality of values of a physiological parameter may be determined. At least one of the signals also may be used to generate a scalogram derived at least in part from the signal. A second plurality of values may be determined based at least in part on a feature in the scalogram. The first and second plurality of values may then be associated, and a physiological state may be analyzed using the associated first and second values. In an embodiment, the signals may be PPG signals and the associated first and second values may include a parameter scatter plot that may permit a user to determine changes in a patient's ventilation state over time.

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Номер записи: 15
02-09-2014 дата публикации

Methods and systems for recalibrating a blood pressure monitor with memory

Номер: US0008825428B2
Автор: Paul Stanley Addison, James N. Watson
Принадлежит: Neilcor Puritan Bennett Ireland

Systems and methods are provided for storing and recalling metrics associated with physiological signals. It may be determined that the value of a monitored physiological metric corresponds to a stored value. In such cases, a patient monitor may determine that a calibration is not desired. In some cases, a patient monitor may recall calibration parameters associated with the stored value if it determined that the stored value corresponds to the monitored metric value.

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Номер записи: 16
24-07-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING RESPIRATORY EFFORT

Номер: US20140207004A1
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Covidien LP

A system for determining respiratory effort of an individual may include a pressure signal determination module configured to determine a physiological pressure signal of the individual, a wavelet transform module configured to transform the physiological pressure signal into a scalogram using at least one wavelet transform, and a respiratory effort determination module configured to determine the respiratory effort of the individual through an analysis of scalogram. 1. A system for determining respiratory effort of an individual , the system comprising:a pressure signal determination module configured to determine a physiological pressure signal of the individual;a wavelet transform module configured to transform the physiological pressure signal into a scalogram using at least one wavelet transform; anda respiratory effort determination module configured to determine the respiratory effort of the individual through an analysis of the scalogram.2. The system of claim 1 , further comprising a pressure detection sub-system configured to directly detect a physiological pressure of the individual claim 1 , wherein the pressure signal determination module determines the physiological pressure signal from the directly-detected physiological pressure of the individual.3. The system of claim 2 , wherein the pressure signal determination module is operatively connected to the pressure detection sub-system claim 2 , and wherein the pressure signal determination module is configured to receive the physiological pressure from the pressure detection sub-system.4. The system of claim 2 , wherein the pressure detection sub-system comprises a pressure detection device including an arterial line (A-line) catheter configured to be implanted within vasculature of the individual claim 2 , and wherein the A-line catheter directly detects the physiological pressure within the vasculature of the patient.5. The system of claim 1 , wherein the scalogram decouples the physiological pressure ...

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Номер записи: 17
30-09-2010 дата публикации

SYSTEMS AND METHODS FOR MONITORING PAIN MANAGEMENT

Номер: US20100249543A1
Автор: Rakesh Sethi, Paul Stanley Addison, James N. Watson, Paul A. Edney, SETHI RAKESH, ADDISON PAUL STANLEY, WATSON JAMES N, EDNEY PAUL A, WATSON JAMES N., EDNEY PAUL A.
Принадлежит: Nellcor Puritan Bennett Ireland

The present disclosure relates to systems and methods for monitoring pain management using measurements of physiological parameters based on a PPG signal. A reference physiological parameter may be compared against a later measurement to identify a change in condition that may indicate a pain management problem.

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Номер записи: 18
28-06-2016 дата публикации

Processing and detecting baseline changes in signals

Номер: US0009378332B2
Автор: James Nicholas Watson, Paul Stanley Addison, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett Ireland, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

Systems and methods for detecting the occurrence of events from a signal are provided. A signal processing system may analyze baseline changes and changes in signal characteristics to detect events from a signal. The system may also detect events by analyzing energy parameters and artifacts in a scalogram of the signal. Further, the system may detect events by analyzing both the signal and its corresponding scalogram.

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Номер записи: 19
09-09-2010 дата публикации

SYSTEMS AND METHODS FOR MONITORING HEART RATE AND BLOOD PRESSURE CORRELATION

Номер: US20100228102A1
Автор: Paul Stanley Addison, James Watson, Rakesh Sethi, ADDISON PAUL STANLEY, WATSON JAMES, SETHI RAKESH
Принадлежит: Nellcor Puritan Bennett Ireland

Systems and methods are provided for monitoring a correlation between heart rate and blood pressure in a patient. When a characteristic of the correlation exceeds a threshold, a patient status indicator signal is sent to a monitoring device In some embodiments, the patient status indicator signal indicates a particular medical condition or alerts a care provider to a change in status. In some embodiments, the heart rate signal is used to improve a blood pressure estimate generated by a different signal. In some embodiments, the heart rate, blood pressure and correlation signals are used in a predictive mathematical model to estimate patient status or outcome.

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Номер записи: 20
30-06-2015 дата публикации

Systems and methods for high-pass filtering a photoplethysmograph signal

Номер: US0009066660B2
Автор: James N. Watson, Paul Stanley Addison, WATSON JAMES N, ADDISON PAUL STANLEY, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES N, ADDISON PAUL STANLEY, NELLCOR PURITAN BENNETT IE, WATSON JAMES N., NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems and methods for high-pass filtering a plethysmograph or photoplethysmograph (PPG) signal are disclosed. A sensor or probe may be used to obtain a plethysmograph or PPG signal from a subject. The sensor may be placed at any suitable location on the body, e.g., the forehead, finger, or toe. The PPG signal generated by the sensor may be high-pass filtered to disambiguate certain features of the PPG signal, including one or more characteristic points. The cut-off frequency for the high-pass filter may be greater than 0.75 Hz and less than 15 Hz. The cut-off frequency for the high-pass filter may be selected to be greater than the subject's computed pulse rate. These characteristic points on the filtered PPG signal may be used to compute non-invasive blood pressure measurements continuously or on a periodic basis. For example, the time difference between two or more characteristic points in a high-pass filtered version of the generated PPG signal may be computed ...

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Номер записи: 21
06-03-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING CARDIAC OUTPUT

Номер: US20140066732A1
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Nellcor Puritan Bennett LLC

A system is configured to determine cardiac output of a patient. The system may include a first sub-system configured to detect a first physiological signal, and a second sub-system configured to detect a second physiological signal that differs from the first physiological signal. The first and second sub-systems may be separate and distinct from one another. The system may also include a cardiac output determination module that is configured to determine the cardiac output based, at least in part, on the first and second physiological signals. 1. A system for determining cardiac output of a patient , the system comprising:a first sub-system configured to detect a first physiological signal;a second sub-system configured to detect a second physiological signal that differs from the first physiological signal, wherein the first and second sub-systems are separate and distinct from one another; anda cardiac output determination module that is configured to determine the cardiac output based, at least in part, on the first and second physiological signals.2. The system of claim 1 , wherein the first sub-system comprises a blood pressure sub-system and the first physiological signal comprises a blood pressure signal claim 1 , and wherein the second sub-system comprises a photoplethsymogram (PPG) sub-system and the second physiological signal comprises a PPG signal claim 1 , and wherein the cardiac output determination module is configured to determine driving pressure from the blood pressure signal claim 1 , and resistance to flow through an analysis of the PPG signal and the blood pressure signal.3. The system of claim 2 , wherein the blood pressure sub-system comprises a blood pressure monitor operatively connected to a blood pressure detection device claim 2 , and wherein the blood pressure detection device is one or more of a non-invasive claim 2 , minimally-invasive claim 2 , or invasive blood pressure detection device.4. The system of claim 2 , wherein the PPG ...

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Номер записи: 22
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046185A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component. 1100-. (canceled)101. A method for determining an artifact pertaining to physiological movement , comprising:obtaining a biosignal from a subject at least in part using a signal acquisition unit;decomposing the biosignal at least in part using a wavelet transform analysis to obtain transform data;identifying a plurality of maxima points in the transform data with respect to time;setting an amplitude threshold; anddetermining the artifact pertaining to physiological movement based at least in part on the plurality of maxima points and the amplitude threshold.102. The method of claim 101 , wherein the signal acquisition unit comprises a photodetector and wherein the biosignal is a photoplethysmogram signal.103. The method of claim 101 , wherein the transform data comprises data for a set of scales.104. The method of claim 103 , wherein the set of scales includes one or more scales corresponding to a pulse ridge and the amplitude threshold is based at least in part on a mean value of the pulse ridge.105. The method of claim 103 , wherein the ...

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Номер записи: 23
16-09-2014 дата публикации

Systems and methods for determining respiratory effort

Номер: US0008834378B2
Автор: Paul Stanley Addison, James N. Watson, ADDISON PAUL STANLEY, WATSON JAMES N, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES N, NELLCOR PURITAN BENNETT IE, WATSON JAMES N., NELLCOR PURITAN BENNETT IRELAND

Systems and methods for calculating a measure of respiratory effort of a subject are provided. The measure of respiratory effort may be calculated based on a differential pulse transit time (DPTT) calculated for received photoplethysmograph signals. The systems and methods may allow for the calculation of respiratory effort in absolute units, and without the need for calibrations from a device that measures blood pressure (e.g., a non-invasive blood pressure cuff).

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Номер записи: 24
26-06-2014 дата публикации

Methods and Systems for Detecting a Sensor Off Condition Using A Reference Ambient Characteristic

Номер: US20140180042A1
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Covidien LP

A physiological monitoring system may use photonic signals at one or more wavelengths to determine physiological parameters. During monitoring, a physiological sensor may become improperly positioned, which may affect the physiological attenuation of the photonic signals, and accordingly a detected light signal. The detected light signal may include an ambient light component and a signal component corresponding to the one or more wavelengths of light. The physiological monitoring system may determine a reference characteristic based on the ambient light component, and compare the signal component with the ambient light component to determine a sensor-off condition. 1. A method for determining whether a physiological sensor is properly positioned on a subject , the method comprising:receiving a detected light signal, wherein the light signal comprises an ambient light signal component and a signal component corresponding to a wavelength of light emitted by the physiological sensor;processing the detected light signal, using processing equipment, to generate a first signal corresponding to the ambient light signal component;processing the detected light signal, using the processing equipment, to generate a second signal corresponding to the ambient light signal component and the signal component;determining, using the processing equipment, at least one reference characteristic based on the first signal;comparing, using the processing equipment, the second signal to the at least one reference characteristic; anddetermining, using the processing equipment, whether the physiological sensor is properly positioned based on the comparison.2. The method of claim 1 , wherein the physiological sensor comprises a pulse oximetry sensor.3. The method of claim 1 , wherein determining the at least one reference characteristic comprises generating a threshold based on at least one particular value of the first signal.4. The method of claim 3 , wherein the at least one particular ...

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Номер записи: 25
09-12-2010 дата публикации

Signal Processing Techniques For Aiding The Interpretation Of Respiration Signals

Номер: US20100312075A1
Автор: Scott McGonigle, Paul Stanley Addison, James Watson
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, a respiration signal may be processed to normalize respiratory feature values in order to improve and/or simplify the interpretation and subsequent analysis of the signal. Data indicative of a signal may be received at a sensor and may be used to generate a respiration signal. Signal peaks in the respiration signal may be identified and signal peak thresholds may be determined. The identified signal peaks may be adjusted based on the signal peak threshold values to normalize the respiration signal.

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Номер записи: 26
03-02-2011 дата публикации

SYSTEMS AND METHODS FOR NON-INVASIVE DETERMINATION OF BLOOD PRESSURE

Номер: US20110028854A1
Автор: Paul Stanley Addison, James Watson
Принадлежит: Nellcor Puritain Bennett Ireland

Methods and systems for determining blood pressure from a pressure signal are disclosed. A patient's blood pressure may be determined by analyzing features of a wavelet transformation of a pressure signal obtained during an occlusion procedure. Ridges in a scalogram of the transformed signal may be identified and used to determine an envelope of a pressure oscillation signal, to which oscillometric blood pressure determination techniques may be applied.

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Номер записи: 27
09-03-2017 дата публикации

SYSTEM AND METHOD FOR REDUCING ALARM FATIGUE

Номер: US20170069188A1
Автор: Paul Stanley Addison, James N. Watson, ADDISON PAUL STANLEY, WATSON JAMES N, Addison Paul Stanley, Watson James N.
Принадлежит:

A method for reducing alarm fatigue, specifically, combining multiple physiological parameters, such as heart rate and respiratory rate, into one index number indicative of the patient's condition. The method includes detecting the severity of the patient's condition, generating, and displaying a scaled version of that index number relative to the severity of the patient's condition. The scaled index number is displayed on a patient monitor device. The scaled index number may have a size and color value. 1. A computer-implemented method for monitoring a patient , comprising:integrating, at a patient monitor device, at least two physiological parameters to generate at least one index number indicative of a patient condition;detecting a severity of the patient condition based on the at least one index number;generating a scale factor for the at least one index number based on the detected severity;generating a scaled index number based on the generated scale factor, the scaled index number having a size and a color value; andtransmitting the scaled index number to a display.2. The method of claim 1 , wherein the size of the scaled index number changes corresponding to the detected severity of the patient condition.3. The method of claim 1 , wherein the color value of the scaled index number changes corresponding to the detected severity of the patient condition.4. The method of claim 1 , further comprising triggering an alarm when the scaled index number passes a certain threshold.5. The method of claim 1 , wherein the displayed index number increases in size claim 1 , while together displayed patient parameters decrease in size claim 1 , as the detected severity of the patient condition increases.6. A patient monitor device claim 1 , comprising:a processor; integrate at least two physiological parameters to generate at least one index number indicative of a patient condition;', 'detect a severity of the patient condition based on the at least one index number;', ' ...

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Номер записи: 28
10-01-2023 дата публикации

Systems and methods for video-based patient monitoring during surgery

Номер: US0011547313B2
Автор: Paul Stanley Addison, David Ming Hui Foo, Dominique Jacquel
Принадлежит: Covidien LP

The present invention relates to the field of medical monitoring, and in particular non-contact monitoring of one or more physiological parameters in a region of a patient during surgery. Systems, methods, and computer readable media are described for generating a pulsation field and/or a pulsation strength field of a region of interest (ROI) in a patient across a field of view of an image capture device, such as a video camera. The pulsation field and/or the pulsation strength field can be generated from changes in light intensities and/or colors of pixels in a video sequence captured by the image capture device. The pulsation field and/or the pulsation strength field can be combined with indocyanine green (ICG) information regarding ICG dye injected into the patient to identify sites where blood flow has decreased and/or ceased and that are at risk of hypoxia.

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Номер записи: 29
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046187A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.

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Номер записи: 30
13-10-2015 дата публикации

Methods and apparatus for calibrating respiratory effort from photoplethysmograph signals

Номер: US0009155493B2
Автор: Paul Stanley Addison, James N. Watson, ADDISON PAUL STANLEY, WATSON JAMES N, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES N, NELLCOR PURITAN BENNETT IE, WATSON JAMES N., NELLCOR PURITAN BENNETT IRELAND

Breathing effort of a patient, as determined (for example) from a photoplethysmograph (PPG) signal from the patient, can be calibrated in relation to air pressure in the patient's respiratory system. This calibration can be done by subjecting the patient to varying amounts of breathing resistance; and for each such amount, concurrently measuring (1) air pressure in the respiratory system (e.g., in the oral/nasal cavity) and (2) breathing effort (from the PPG signal). Use can be made of this calibration, e.g., during a sleep study of the patient. During such a study, breathing effort, again determined from the PPG signal and occurring, for example, during an apneic event of the patient, can be used to infer air pressure in the respiratory system by using the above calibration.

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Номер записи: 31
31-07-2014 дата публикации

WAVELET-BASED SYSTEM AND METHOD FOR ANALYZING A PHYSIOLOGICAL SIGNAL

Номер: US20140213862A1
Автор: Paul Stanley Addison, James Ochs, James Nicholas Watson, ADDISON PAUL STANLEY, OCHS JAMES, WATSON JAMES NICHOLAS
Принадлежит: Covidien LP

Certain embodiments of the present disclosure provide a system and method for analyzing a physiological signal detected from an individual. The system may include a physiological signal detection module configured to detect the physiological signal of the individual, a wavelet formation module configured to form a wavelet based on the physiological signal, and a wavelet transform module configured to generate a scalogram by transforming the physiological signal with the wavelet based on the physiological signal. 1. A system for analyzing a physiological signal detected from an individual , the system comprising:a physiological signal detection module configured to detect the physiological signal of the individual;a wavelet formation module configured to form a wavelet based on the physiological signal; anda wavelet transform module configured to generate a scalogram by transforming the physiological signal with the wavelet based on the physiological signal.2. The system of claim 1 , further comprising a physiological parameter determination module configured to determine one or more physiological parameters of the individual through an analysis of the scalogram.3. The system of claim 1 , further comprising a detection sub-system in communication with the physiological signal detection module claim 1 , wherein the physiological signal detection module is configured to receive the physiological signal from the detection sub-system.4. The system of claim 3 , wherein the detection sub-system comprises a photoplethysmograph (PPG) sub-system claim 3 , and wherein the physiological signal comprises a PPG signal.5. The system of claim 3 , wherein the detection sub-system comprises a blood pressure detection sub-system claim 3 , and wherein the physiological signal comprises a blood pressure signal.6. The system of claim 3 , wherein the detection sub-system comprises an electrocardiogram (EKG) sub-system claim 3 , and wherein the physiological signal comprises an EKG signal. ...

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Номер записи: 32
17-05-2012 дата публикации

METHODS AND SYSTEMS FOR DISCRIMINATING BANDS IN SCALOGRAMS

Номер: US20120123689A1
Автор: Paul Stanley Addison, James Watson, David Clifton, ADDISON PAUL STANLEY, WATSON JAMES, CLIFTON DAVID
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

The present disclosure is directed towards embodiments of systems and methods for discriminating (e.g., masking out) scale bands that are determined to be not of interest from a scalogram derived from a continuous wavelet transform of a signal. Techniques for determining whether a scale band is not of interest include, for example, determining whether a scale band's amplitude is being modulated by one or more other bands in the scalogram. Another technique involves determining whether a scale band is located between two other bands and has energy less than that of its neighboring bands. Another technique involves determining whether a scale band is located at about half the scale of another, more dominant (i.e., higher energy) band. 120-. (canceled)21. A method comprising:generating a scalogram based at least in part on a continuous wavelet transform of a signal;determining whether a first band of scales in the scalogram is negatively affected by a second band of scales; andextracting the first band of scales in response to determining that the first band is negatively affected by the second band.22. The method of further comprising:identifying the first band of scales from the scalogram; andin response to determining that the first band of scales is negatively affected by the second band of scales, identifying a third band of scales from the scalogram.23. The method of claim 21 , wherein the determining is performed at least in part by a mod-max discriminator.24. The method of claim 21 , wherein the first band of scales is negatively affected by the second band of scales when the first band's energy amplitude is modulated by the second band.25. The method of claim 21 , wherein the determining further comprises:computing energy of a source ridge candidate;determining a threshold from the computed energy of the source ridge candidate;computing energy of a profile ridge candidate; andcomparing the computed energy of the profile ridge candidate to the threshold.26. The ...

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Номер записи: 33
09-08-2012 дата публикации

SYSTEMS AND METHODS FOR MONITORING DEPTH OF CONSCIOUSNESS

Номер: US20120203087A1
Автор: Edward M. McKenna, Bo Chen, Youzhi Li, Paul Stanley Addison, James N. Watson, MCKENNA EDWARD M, CHEN BO, LI YOUZHI, ADDISON PAUL STANLEY, WATSON JAMES N, MCKENNA EDWARD M., WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett LLC

During patient monitoring, a depth of consciousness (DOC) measure, such as a bispectral index, may be used in conjunction with additional information obtained from an awareness metric derived from one or more physiological signals, such as a photoplethysmograph signal. In an embodiment, a DOC measure may be combined with information from an awareness metric to produce a combined DOC measure. In an embodiment, information from an awareness metric derived from one or more physiological signals may be used to provide an indication of confidence in a DOC measure. In an embodiment, a DOC measure may be used to provide an indication of confidence in a depth of consciousness assessment based on an awareness metric. In an embodiment, one or the other of a DOC measure and an awareness metric may be used to provide an indication of a patient's depth of consciousness (e.g., by one “overriding” the other). 1. A physiological monitoring method comprising:receiving a physiological signal;deriving an awareness metric based at least in part on the physiological signal;deriving at least one depth of consciousness measure;evaluating the awareness metric and the depth of consciousness measure; andproviding depth of consciousness information based at least in part on the evaluation.2. The method of wherein the physiological signal comprises a photoplethysmograph signal.3. The method of wherein the awareness metric is a change in morphology of the photoplethysmograph4. The method of wherein the awareness metric indicates a change in vasotone.5. The method of claim 1 , wherein the depth of consciousness measure is based at least in part on an electrophysiological signal.6. The method of wherein the depth of consciousness measure is a bispectral index value.7. The method of wherein evaluating the awareness metric and the depth of consciousness measure comprises determining a confidence for at least one of the awareness metric and the depth of consciousness measure.8. The method of wherein ...

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Номер записи: 34
27-02-2014 дата публикации

SYSTEM AND METHOD FOR DETECTING FLUID RESPONSIVENESS OF A PATIENT

Номер: US20140058229A1
Автор: Mark Su, James Nicholas Watson, Paul Stanley Addison, SU MARK, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett LLC

A system is configured to determine a fluid responsiveness index of a patient from a physiological signal. The system may include a sensor configured to be secured to an anatomical portion of the patient, and a monitor operatively connected to the sensor. The sensor is configured to sense a physiological characteristic of the patient. The monitor is configured to receive a physiological signal from the sensor. The monitor may include an index-determining module configured to determine the fluid responsiveness index through formation of a ratio of one or both of amplitude or frequency modulation of the physiological signal to baseline modulation of the physiological signal. 1. A system for determining a fluid responsiveness index of a patient from a physiological signal , the system comprising:a sensor configured to be secured to an anatomical portion of the patient, wherein the sensor is configured to sense a physiological characteristic of the patient; anda monitor operatively connected to the sensor, the monitor configured to receive a physiological signal from the sensor, the monitor comprising an index-determining module configured to determine the fluid responsiveness index through formation of a ratio of one or both of amplitude modulation or frequency modulation of the physiological signal with respect to baseline modulation of the physiological signal.2. The system of claim 1 , wherein the monitor further comprises a normalization module configured to normalize the fluid responsiveness index.3. The system of claim 2 , wherein the normalization module is configured to normalize the fluid responsiveness index to correct for changes in one or both of vascular tone or motion artifacts.4. The system of claim 2 , wherein the normalization module is configured to normalize the fluid responsiveness index based on one or more of a relative amplitude ratio of the physiological signal claim 2 , a width of at least one primary peak of the physiological signal claim 2 , ...

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Номер записи: 35
22-01-2013 дата публикации

Systems and methods for evaluating a physiological condition using a wavelet transform and identifying a band within a generated scalogram

Номер: US0008358213B2
Автор: James Nicholas Watson, Paul Stanley Addison, Edward M. McKenna, James P. Ochs, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, MCKENNA EDWARD M, OCHS JAMES P, MCKENNA EDWARD M., OCHS JAMES P.
Принадлежит: Covidien LP, COVIDIEN LP, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, MCKENNA EDWARD M, OCHS JAMES P, MCKENNA EDWARD M., OCHS JAMES P.

A method and system are provided for evaluating in patient monitoring whether a signal is sensed optimally by receiving a signal, transforming the signal using a wavelet transform, generating a scalogram based at least in part on the transformed signal, identifying a pulse band in the scalogram, identifying a characteristic of the pulse band, determining, based on the characteristic of the pulse band, whether the signal is sensed optimally; and triggering an event. The characteristics of the pulse band and scalogram may be used to provide an indication of monitoring conditions.

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Номер записи: 36
23-05-2013 дата публикации

Methods and Systems for Determining Whether to Trigger an Alarm

Номер: US20130127621A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

According to embodiment, systems and methods for processing a physiological measurement and generating alarms based on the measurement are provided. Multiple features of a single physiological measurement may be concurrently monitored to generate alarms. One or more of the features may be based on a trend of the physiological measurement. One or more of the features may be based on a wavelet transform of the physiological measurement. Different features may be used in different combinations to lower the percentage of false alarms while still recognizing valid alarm events. 1. A method for determining whether to trigger an alarm , the method comprising: [{'sub': '2', 'receiving an SpOsignal;'}, {'sub': '2', 'determining at least one feature of the SpOsignal;'}, {'sub': '2', 'performing a wavelet transform of the SpOsignal to generate a scalogram;'}, 'determining at least one feature of the scalogram; and', {'sub': '2', 'determining whether to trigger an alarm based at least in part on the at least one feature of the SpOsignal and the at least one feature of the scalogram.'}], 'using a processor for2. The method of claim 1 , wherein the at least one feature of the scalogram comprises signal quality.3. The method of claim 1 , wherein the at least one feature of the scalogram comprises a feature indicative of a probe condition.4. The method of claim 1 , wherein the at least one feature of the scalogram comprises a moving average of the scalogram.5. The method of claim 1 , wherein the at least one feature of the scalogram comprises a slope of the scalogram.6. The method of claim 1 , wherein the feature of the SpOsignal comprises a moving average of the SpOsignal.7. The method of claim 1 , wherein the feature of the SpOsignal comprises a value of the SpOsignal.8. The method of claim 1 , wherein the feature of the SpOsignal comprises a slope of the SpOsignal.9. The method of claim 1 , further comprising determining whether the at least one feature of the SpOsignal is below ...

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Номер записи: 37
08-04-2010 дата публикации

Extraction Of Physiological Measurements From A Photoplethysmograph (PPG) Signal

Номер: US20100087720A1
Автор: Paul Stanley Addison, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett Ireland, Mervue

The present disclosure relates to signal processing and, more particularly, to determining the value of a physiological parameter, such as the blood oxygen saturation (SpO2) of a subject. In an embodiment, a first baseline for a first waveform and a second baseline for a second waveform are determined. In this embodiment, the first and second waveforms are indicative of the physiological parameter of the subject. The first and second waveforms are filtered to obtain a first direct-current (DC) component for the first waveform and a second DC component for the second waveform. A measured value for the physiological parameter is derived from the first and second baseline signals, and the first and second DC components. In an embodiment, the measured value for the physiological parameter is determined based on a ratio of the normalized difference between the DC component and the baseline signal for the first waveform with respect to same for the second waveform.

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Номер записи: 38
25-02-2020 дата публикации

Combined physiological sensor systems and methods

Номер: US0010568526B2
Автор: Edward M. McKenna, Bo Chen, Youzhi Li, Paul Stanley Addison, MCKENNA EDWARD M, CHEN BO, LI YOUZHI, ADDISON PAUL STANLEY, McKenna, Edward M., Chen, Bo, Li, Youzhi, Addison, Paul Stanley
Принадлежит: Covidien LP, COVIDIEN LP

A combined physiological sensor and methods for detecting one or more physiological characteristics of a subject are provided. The combined sensor (e.g., a forehead sensor) may be used to detect and/or calculate at least one of a pulse blood oxygen saturation level, a regional blood oxygen saturation level, a respiration rate, blood pressure, an electrical physiological signal (EPS), a pulse transit time (PTT), body temperature associated with the subject, a depth of consciousness (DOC) measurement, any other suitable physiological parameter, and any suitable combination thereof. The combined sensor may include a variety of individual sensors, such as electrodes, optical detectors, optical emitters, temperature sensors, and/or other suitable sensors. The sensors may be advantageously positioned in accordance with a number of different geometries. The combined sensor may also be coupled to a monitoring device, which may receive and/or process one or more output signals from the individual ...

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Номер записи: 39
19-12-2019 дата публикации

SYSTEMS AND METHODS FOR VIDEO-BASED PATIENT MONITORING DURING SURGERY

Номер: US20190380599A1
Автор: Paul Stanley Addison, David Ming Hui Foo, Dominique Jacquel, ADDISON PAUL STANLEY, FOO DAVID MING HUI, JACQUEL DOMINIQUE, Addison, Paul Stanley, Foo, David Ming Hui, Jacquel, Dominique
Принадлежит:

The present invention relates to the field of medical monitoring, and in particular non-contact monitoring of one or more physiological parameters in a region of a patient during surgery. Systems, methods, and computer readable media are described for generating a pulsation field and/or a pulsation strength field of a region of interest (ROI) in a patient across a field of view of an image capture device, such as a video camera. The pulsation field and/or the pulsation strength field can be generated from changes in light intensities and/or colors of pixels in a video sequence captured by the image capture device. The pulsation field and/or the pulsation strength field can be combined with indocyanine green (ICG) information regarding ICG dye injected into the patient to identify sites where blood flow has decreased and/or ceased and that are at risk of hypoxia. 1. A method for assessing physiological parameter strength in a region of interest (ROI) , the method comprising:locking an image capture device in a first position;capturing a red, green, blue (RGB) video sequence of the ROI using the image capture device, andgenerating a physiological strength field of a physiological parameter of the ROI from the RGB video sequence.2. The method of claim 1 , further comprising activating a physiological strength field feature of a video-based patient monitoring system.3. The method of claim 2 , wherein activating the physiological strength field feature comprises actuating a hardware component on the video-based patient monitoring system claim 2 , pressing a software button on a display of the video-based patient monitoring system claim 2 , and/or instructing the video-based patient monitoring system to activate the physiological strength field feature via a voice command.4. The method of claim 1 , wherein locking the image capture device in the first position includes locking the image capture device in the first position for a predetermined amount of time.5. The method ...

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Номер записи: 40
05-04-2016 дата публикации

Systems and methods for recalibrating a non-invasive blood pressure monitor

Номер: US0009301697B2
Автор: Clark R. Baker, Jr., James Nicholas Watson, Paul Stanley Addison, BAKER JR CLARK R, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, BAKER, JR. CLARK R.
Принадлежит: Nellcor Puritan Bennett Ireland, BAKER JR CLARK R, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, NELLCOR PURITAN BENNETT IE, BAKER, JR. CLARK R., NELLCOR PURITAN BENNETT IRELAND

Techniques for non-invasive blood pressure monitoring are disclosed. Data corresponding to a patient may be received from a hospital information system. The data may include, for example, drug administration data, medical procedure data, medical equipment data, or a combination thereof. Whether a blood pressure monitoring system needs to be recalibrated may be determined, based at least in part on the received data. If it is determined that the blood pressure monitoring system needs to be recalibrated, the recalibration may be performed and at least one blood pressure measurement of the patient may be computed using the recalibrated blood pressure monitoring system.

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Номер записи: 41
27-01-2011 дата публикации

SYSTEMS AND METHODS FOR RESPIRATION MONITORING

Номер: US20110021892A1
Автор: Paul Stanley Addison, James N. Watson, Scott McGonigle
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, techniques for determining respiratory parameters are disclosed. More suitable probe locations for determining respiratory parameters, such as respiration rate and respiratory effort, may be identified. The most suitable probe location may be selected for probe placement. A scalogram may be generated from the detected signal at the more suitable location, resulting in an enhanced breathing band for determining respiratory parameters. Flexible probes that allow for a patient's natural movement due to respiration may also be used to enhance the breathing components of the detected signal. From the enhanced signal, more accurate and reliable respiratory parameters may be determined.

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Номер записи: 42
31-12-2015 дата публикации

DEVICE AND SYSTEM COMMUNICATING WITH A SUBJECT

Номер: US20150379220A1
Автор: Paul Stanley Addison, Michal Ronen, Konstantin Goulitski
Принадлежит:

Provided are device, system and method for communicating with a subject, based on the condition of the subject, by providing instructions to the subject and/or to a health care provider. 1. A system for communicating with a subject , the system comprising:one or more medical monitoring devices configured to measure one or more physiological parameters of the subject;a communicating device configured to integrate the one or more physiological parameters of the subject to determine the condition of the subject and/or changes to the condition of the subject, based on the measured parameters and provide instructions to the subject or to a health care provider, wherein the instructions are related to the condition of the subject.2. The system of claim 1 , wherein the medical monitoring device comprises: capnograph claim 1 , pulse oximeter claim 1 , Electrocardiogram (ECG) claim 1 , Brain activity monitoring device claim 1 , or combinations thereof.3. The system of claim 1 , wherein the physiological parameters of the subject comprises: breath related parameters claim 1 , heart related parameters claim 1 , blood related parameters claim 1 , brain electrical activity claim 1 , parameters derived therefrom claim 1 , or combinations thereof.4. The system of claim 1 , wherein the instructions comprise visual and/or audible instructions.5. The system of claim 1 , wherein the instructions comprise instructions for an intervention procedure to be taken by the subject claim 1 , instructions for an intervention procedure to be taken by the health care provider; an indication to the subject claim 1 , or combinations thereof.6. The system of claim 1 , wherein the communicating device comprises a display unit and/or an audio unit.7. The system of claim 1 , wherein the instructions are selected from a predetermined set of instructions.8. The system of claim 7 , wherein the display unit is configured to display one or more of: one or more of the measured parameters claim 7 , parameters ...

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Номер записи: 43
13-01-2015 дата публикации

Systems and methods for monitoring heart rate and blood pressure correlation

Номер: US0008932219B2
Автор: Paul Stanley Addison, James Watson, Rakesh Sethi, ADDISON PAUL STANLEY, WATSON JAMES, SETHI RAKESH
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES, SETHI RAKESH, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

Systems and methods are provided for monitoring a correlation between heart rate and blood pressure in a patient. When a characteristic of the correlation exceeds a threshold, a patient status indicator signal is sent to a monitoring device. In some embodiments, the patient status indicator signal indicates a particular medical condition or alerts a care provider to a change in status. In some embodiments, the heart rate signal is used to improve a blood pressure estimate generated by a different signal. In some embodiments, the heart rate, blood pressure and correlation signals are used in a predictive mathematical model to estimate patient status or outcome.

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Номер записи: 44
15-12-2011 дата публикации

Systems And Methods For Wavelet Transform Using Mean-Adjusted Wavelets

Номер: US20110306858A1
Автор: James N. Watson, Dominique Jacquel, Paul Stanley Addison, WATSON JAMES N, JACQUEL DOMINIQUE, ADDISON PAUL STANLEY, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland

Methods and systems are disclosed for transforming a signal using a continuous wavelet transform based at least in part on a truncated, mean-adjusted wavelet. A wavelet may be truncated to a finite support to generate a truncated wavelet. The real part of the truncated wavelet may be forced to have a zero mean to generate a truncated, mean-adjusted wavelet. The signal may be transformed using a continuous wavelet transform based at least in part on the truncated mean-adjusted wavelet. Information may be derived about the signal from the transformed signal.

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Номер записи: 45
22-03-2016 дата публикации

Methods and systems for recalibrating a blood pressure monitor with memory

Номер: US0009289136B2
Автор: Paul Stanley Addison, James N. Watson, ADDISON PAUL STANLEY, WATSON JAMES N, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

Systems and methods are provided for storing and recalling metrics associated with physiological signals. It may be determined that the value of a monitored physiological metric corresponds to a stored value. In such cases, a patient monitor may determine that a calibration is not desired. In some cases, a patient monitor may recall calibration parameters associated with the stored value if it determined that the stored value corresponds to the monitored metric value.

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Номер записи: 46
17-06-2014 дата публикации

Methods and apparatus for producing and using lightly filtered photoplethysmograph signals

Номер: US0008755854B2
Автор: Paul Stanley Addison, James Watson, ADDISON PAUL STANLEY, WATSON JAMES
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

One or more physiological conditions of a patient can be observed by obtaining a photoplethysmograph (PPG) signal from the patient and by only lightly filtering that signal. The light filtering of the PPG may be such as to only remove (for example) high frequency noise from that signal, while leaving in the signal most or all frequency components that are due to physiological events in the patient. In this way, such physiological events can be observed via a visual display of the lightly filtered PPG signal and/or via other signal processing of the lightly filtered PPG signal to automatically extract certain physiological parameters or characteristics from that signal.

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Номер записи: 47
30-10-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING HEMODYNAMIC STATUS THROUGH A BLOOD PRESSURE RELATED INDEX

Номер: US20140323846A1
Автор: Kathleen H. Niebel, James Nicholas Watson, Paul Stanley Addison, NIEBEL KATHLEEN H, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, NIEBEL KATHLEEN H.
Принадлежит: COVIDIEN LP

A system for determining a hemodynamic status of an individual may include a photoplethysmography (PPG) sub-system configured to detect a PPG signal and a response triggering module configured to analyze the PPG signal and output one or more response triggers based on a changing feature of the PPG signal within a time window. Each of the one or more response triggers may relate to an instruction to initiate detection of at least one physiological characteristic of the individual. A blood pressure (BP) variability index determination module is configured to determine a BP variability index related to a hemodynamic status of the individual based on a frequency or pattern of the one or more response triggers. 1. A system for determining a hemodynamic status of an individual , the system comprising:a photoplethysmography (PPG) sub-system configured to detect a PPG signal;a response triggering module configured to analyze the PPG signal and output one or more response triggers based on a changing feature of the PPG signal within a time window, wherein each of the one or more response triggers relates to an instruction to initiate detection of at least one physiological characteristic of the individual; anda blood pressure (BP) variability index determination module configured to determine a BP variability index related to the hemodynamic status of the individual based on a frequency or pattern of the one or more response triggers.2. The system of claim 1 , wherein the physiological characteristic of the individual includes a blood pressure of the individual.3. The system of claim 1 , wherein the BP variability index is based on the frequency of the one or more response triggers output by the response triggering module during the time window.4. The system of claim 1 , further comprising a BP detection unit operatively connected to the response trigger module and the BP variability index determination module claim 1 , wherein the BP detection unit is configured to initiate ...

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Номер записи: 48
19-04-2016 дата публикации

Detecting sleep events using localized blood pressure changes

Номер: US0009314168B2
Автор: James Nicholas Watson, Rakesh Sethi, Paul Stanley Addison, WATSON JAMES NICHOLAS, SETHI RAKESH, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES NICHOLAS, SETHI RAKESH, ADDISON PAUL STANLEY, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

Techniques for detecting sleep events are disclosed. In some embodiments, a continuous non-invasive blood pressure (CNIBP) monitoring system may be used to obtain blood pressure values from a subject during a sleep study. Changes in the blood pressure over time may be determined and analyzed in order to identify a sleep event. The localized blood pressure changes may be interpreted in isolation or in combination with other signals collected from the subject.

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Номер записи: 49
22-10-2019 дата публикации

System and method for determining stroke volume of a patient

Номер: US0010448851B2
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, Addison, Paul Stanley, Watson, James Nicholas
Принадлежит: Covidien LP, COVIDIEN LP

A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time.

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Номер записи: 50
15-12-2011 дата публикации

LOW PERFUSION SIGNAL PROCESSING SYSTEMS AND METHODS

Номер: US20110307184A1
Автор: James Nicholas Watson, Paul Stanley Addison, Edward M McKenna, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, MCKENNA EDWARD M
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

In some embodiments, systems and methods for identifying a low perfusion condition are provided by transforming a signal using a wavelet transform to generate a scalogram. A pulse band and adjacent marker regions in the scalogram are identified. Characteristics of the marker regions are used to detect the existence of a lower perfusion condition. If such a condition is detected, an event may be triggered, such as an alert or notification.

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Номер записи: 51
11-10-2016 дата публикации

Methods and systems for determining a probe-off condition in a medical device

Номер: US0009462976B2
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, Addison Paul Stanley, Watson James Nicholas
Принадлежит: Covidien LP, COVIDIEN LP

A physiological monitoring system may determine a probe-off condition. A physiological sensor may be used to emit one or more wavelengths of light. A received light signal may be processed to obtain a light signal corresponding to the emitted light and an ambient signal. The signals may be analyzed to identify similar behavior. The system may determine whether the physiological sensor is properly positioned based on the analysis.

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Номер записи: 52
23-10-2012 дата публикации

Systems and methods for ridge selection in scalograms of signals

Номер: US0008295567B2
Автор: James Watson, Paul Stanley Addison, David Clifton, WATSON JAMES, ADDISON PAUL STANLEY, CLIFTON DAVID
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES, ADDISON PAUL STANLEY, CLIFTON DAVID, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems, devices, and methods for ridge selection in scalograms are disclosed. Ridges or ridge components are features within a scalogram which may be computed from a signal such as a physiological (e.g., photoplethysmographic) signal. Ridges may be identified from one or more scalograms of the signal. Parameters characterizing these ridges may be determined. Based at least in part on these parameters, a ridge density distribution function is determined. A ridge is selected from analyzing this ridge density distribution function. In some embodiments, the selected ridge is used to determine a physiological parameter such as respiration rate.

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Номер записи: 53
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046186A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component. 1100-. (canceled)101. A method for determining physiological information , comprising:obtaining a biosignal from a subject at least in part using a signal acquisition unit;decomposing the biosignal at least in part using a wavelet transform analysis to generate transform data;identifying a path in a band based at least in part on the transform data;decomposing the path into the frequency domain; anddetermining a dominant peak of the frequency domain to determine physiological information of the subject.102. The method of claim 101 , wherein the path comprises a ridge of the band or a path in a vicinity of a ridge of the band.103. The method of claim 102 , wherein the path comprises time-scale points.104. The method of claim 102 , wherein the path comprises time-amplitude points.105. The method of claim 101 , wherein the signal acquisition unit comprises a photodetector and wherein the biosignal is a photoplethysmogram signal.106. The method of claim 101 , wherein decomposing the biosignal at least in part using the wavelet transform analysis ...

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Номер записи: 54
02-04-2013 дата публикации

Systems and methods for monitoring pain management

Номер: US0008412295B2
Автор: Rakesh Sethi, Paul Stanley Addison, James N. Watson, Paul A. Edney, SETHI RAKESH, ADDISON PAUL STANLEY, WATSON JAMES N, EDNEY PAUL A, WATSON JAMES N., EDNEY PAUL A.
Принадлежит: Covidien LP, SETHI RAKESH, ADDISON PAUL STANLEY, WATSON JAMES N, EDNEY PAUL A, COVIDIEN LP, WATSON JAMES N., EDNEY PAUL A.

The present disclosure relates to systems and methods for monitoring pain management using measurements of physiological parameters based on a PPG signal. A reference physiological parameter may be compared against a later measurement to identify a change in condition that may indicate a pain management problem.

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Номер записи: 55
03-11-2011 дата публикации

SYSTEMS AND METHODS FOR PPG SENSORS INCORPORATING EKG SENSORS

Номер: US20110270048A1
Автор: Paul Stanley Addison, James N. Watson, Rakesh Sethi, ADDISON PAUL STANLEY, WATSON JAMES N, SETHI RAKESH, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland

Techniques and structures are disclosed for using photoplethysmograph (PPG) and electrocardiographic (EKG)-based readings of a subject to determine one or more physiological characteristics of the subject. In an arrangement, a combined PPG-EKG sensor unit may be used to detect both PPG and EKG signals of the subject. The sensor unit may include a PPG sensor, an EKG sensor, and a support structure for connecting or fastening the sensor unit to the subject. The detected readings may be provided to an electronic monitor. In an arrangement, a PPG-EKG monitoring system, including the electronic monitor, may be used to determine the physiological parameters of the subject. The monitoring system may first determine an auxiliary parameter based at least in part on the EKG signal, and then compute the one or more physiological characteristics of the subject based at least in part on both the PPG signal and the auxiliary parameter.

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Номер записи: 56
09-07-2013 дата публикации

Systems and methods for ridge selection in scalograms of signals

Номер: US0008483459B2
Автор: James Nicholas Watson, Paul Stanley Addison, David Clifton, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, CLIFTON DAVID
Принадлежит: Nèllcor Puritan Bennett Ireland, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, CLIFTON DAVID, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems, devices, and methods for ridge selection in scalograms are disclosed. Ridges or ridge components are features within a scalogram which may be computed from a signal such as a physiological (e.g., photoplethysmographic) signal. Ridges may be identified from one or more scalograms of the signal. Parameters characterizing these ridges may be determined. Based at least in part on these parameters, a ridge density distribution function is determined. A ridge is selected from analyzing this ridge density distribution function. In some embodiments, the selected ridge is used to determine a physiological parameter such as respiration rate.

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Номер записи: 57
03-02-2011 дата публикации

Systems And Methods For Determining Physiological Information Using Selective Transform Data

Номер: US20110026784A1
Автор: Braddon M. Van Slyke, Paul Stanley Addison, James Nicholas Watson, Scott McGonigle
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, a pulse band region is identified in a wavelet scalogram of a physiological signal (e.g., a plethysmograph or photoplethysmograph signal). Components of the scalogram at scales larger than the identified pulse band region are then used to determine a baseline signal in wavelet space. The baseline signal may then be used to normalize the physiological signal. Physiological information may be determined from the normalized signal. For example, oxygen saturation may be determined using a ratio of ratios or any other suitable technique.

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Номер записи: 58
30-06-2015 дата публикации

Using a continuous wavelet transform to generate a reference signal

Номер: US0009066691B2
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems and methods for generating reference signals are provided. A signal may be transformed using a continuous wavelet transform. Regions of interest may be selected from a transform or the resulting scalogram that may be used to generate a reference signal to use in filtering the signal or other signals. Cross-correlation techniques may be used to cancel noise components or isolate non-noise components from the signal. A physiological parameter may then be determined from the filtered signal or isolated components in the signal.

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Номер записи: 59
11-12-2014 дата публикации

METHODS AND SYSTEMS FOR RECALIBRATING A BLOOD PRESSURE MONITOR WITH MEMORY

Номер: US20140364746A1
Автор: Paul Stanley Addison, James N. Watson, ADDISON PAUL STANLEY, WATSON JAMES N, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland ULC

Systems and methods are provided for storing and recalling metrics associated with physiological signals. It may be determined that the value of a monitored physiological metric corresponds to a stored value. In such cases, a patient monitor may determine that a calibration is not desired. In some cases, a patient monitor may recall calibration parameters associated with the stored value if it determined that the stored value corresponds to the monitored metric value.

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Номер записи: 60
01-12-2015 дата публикации

Determining a characteristic physiological parameter

Номер: US0009198582B2
Автор: James N. Watson, Paul Stanley Addison, Rakesh Sethi, WATSON JAMES N, ADDISON PAUL STANLEY, SETHI RAKESH, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES N, ADDISON PAUL STANLEY, SETHI RAKESH, NELLCOR PURITAN BENNETT IE, WATSON JAMES N., NELLCOR PURITAN BENNETT IRELAND

The present disclosure relates to monitoring a characteristic physiological parameter of a patient during a suitable time period that either precedes or follows a triggering event, such as a clinician/patient interaction, that may negatively impact the physiological parameter. In some embodiments, physiological parameter values falling between one or more pre-set thresholds may be used to derive the characteristic physiological parameter. In some embodiments, tracking the physiological parameter may provide additional information about the patient's status. In some embodiments, confidence measures may be associated with, or may be used to analyze features of the patient signal to derive information about, the characteristic physiological parameter. The patient signal used to derive a patient's physiological parameter may be of an oscillatory nature or may include oscillatory features that may be analyzed to derive a characteristic blood pressure or a characteristic respiration rate.

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Номер записи: 61
03-11-2011 дата публикации

METHODS AND APPARATUS FOR CALIBRATING RESPIRATORY EFFORT FROM PHOTOPLETHYSMOGRAPH SIGNALS

Номер: US20110270114A1
Автор: Paul Stanley Addison, James N. Watson, ADDISON PAUL STANLEY, WATSON JAMES N, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland

Breathing effort of a patient, as determined (for example) from a photoplethysmograph (PPG) signal from the patient, can be calibrated in relation to air pressure in the patient's respiratory system. This calibration can be done by subjecting the patient to varying amounts of breathing resistance; and for each such amount, concurrently measuring (1) air pressure in the respiratory system (e.g., in the oral/nasal cavity) and (2) breathing effort (from the PPG signal). Use can be made of this calibration, e.g., during a sleep study of the patient. During such a study, breathing effort, again determined from the PPG signal and occurring, for example, during an apneic event of the patient, can be used to infer air pressure in the respiratory system by using the above calibration.

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Номер записи: 62
26-11-2013 дата публикации

Systems and methods for resolving the continuous wavelet transform of a signal

Номер: US0008594759B2
Автор: Braddon M. Van Slyke, Paul Stanley Addison, James Nicholas Watson, VAN SLYKE BRADDON M, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, VAN SLYKE BRADDON M.
Принадлежит: Nellcor Puritan Bennett Ireland, VAN SLYKE BRADDON M, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, NELLCOR PURITAN BENNETT IE, VAN SLYKE BRADDON M., NELLCOR PURITAN BENNETT IRELAND

According to an embodiment, techniques for estimating scalogram energy values in a wedge region of a scalogram are disclosed. A pulse oximetry system including a sensor or probe may be used to receive a photoplethysmograph (PPG) signal from a patient or subject. A scalogram, corresponding to the obtained PPG signal, may be determined. In an approach, energy values in the wedge region of the scalogram may be estimated by performing convolution-based or convolution-like operations on the obtained PPG signal, or a transformed version thereof, and the scalogram may be updated according to the estimated values. In an approach, a deskewing technique may be used to align data prior to adding the data to the scalogram. In an approach, one or more signal parameters may be determined based on the resolved and estimated values of the scalogram.

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Номер записи: 63
15-08-2013 дата публикации

SYSTEMS AND METHODS FOR GATING AN IMAGING DEVICE

Номер: US20130211235A1
Автор: Robert Stoughton, Paul Stanley Addison, James Watson
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A method and system for automatically gating an imaging device is disclosed. Physiological process information of a patient may be derived from a plethysmographic signal, for example, by analyzing the plethysmographic signal transformed by a continuous wavelet transform. Other techniques for deriving physiological process information of a patient include, for example, analyzing a scalogram derived from the continuous wavelet transform. The physiological process information may be used to automatically gate imaging data acquired from an imaging device in order to synchronize the imaging data with the physiological process information. 1. A method of obtaining imaging data from a patient , the method comprising:receiving from a sensor a plethysmographic signal;determining, using a processor, respiration information based on the plethysmographic signal; andgating an imaging device based on the respiration information.2. The method of claim 1 , wherein the imaging device comprises one of a computed tomography device claim 1 , a positron emission tomography device claim 1 , and a magnetic resonance imaging device.3. The method of claim 1 , wherein the respiration information comprises respiration rate.4. The method of claim 1 , wherein the respiration information comprises phase information of the patient's respiratory cycle.5. The method of claim 4 , wherein the imaging device is gated in phase with the patient's respiratory cycle.6. The method of claim 4 , wherein the imaging device is gated to obtain images of the patient at the beginning of inspiration or expiration.7. The method of claim 1 , wherein the respiration information comprises identification of atypical breaths.8. The method of claim 1 , further comprising determining claim 1 , using the processor claim 1 , cardiac information based on the plethysmographic signal claim 1 , wherein gating the imaging device comprises gating the imaging device based on the respiration information and the cardiac information. ...

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Номер записи: 64
25-03-2014 дата публикации

Systems and methods for pulse processing

Номер: US0008679027B2
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

According to embodiments, techniques for using continuous wavelet transforms to process pulses from a photoplethysmographic (PPG) signal are disclosed. The continuous wavelet transform of the PPG signal may be used to identify and characterize features and their periodicities within a signal. Regions, phases and amplitudes within the scalogram associated with these features may then be analyzed to identify, locate, and characterize a true pulse within the PPG signal. Having characterized and located the pulse in the PPG (possibly also using information gained from conventional pulse processing techniques such as, for example, by identifying turning points for candidate pulse maxima and minima on the PPG, frequency peak picking for candidate scales of pulses, etc.), the PPG may be parameterized for ease of future processing.

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Номер записи: 65
11-10-2012 дата публикации

Systems and Methods for Monitoring Heart Rate and Blood Pressure Correlation

Номер: US20120259235A1
Автор: Paul Stanley Addison, James Watson, Rakesh Sethi, ADDISON PAUL STANLEY, WATSON JAMES, SETHI RAKESH
Принадлежит: Nellcor Puritan Bennett LLC

Systems and methods are provided for monitoring a correlation between heart rate and blood pressure in a patient. When a characteristic of the correlation exceeds a threshold, a patient status indicator signal is sent to a monitoring device. In some embodiments, the patient status indicator signal indicates a particular medical condition or alerts a care provider to a change in status. In some embodiments, the heart rate signal is used to improve a blood pressure estimate generated by a different signal. In some embodiments, the heart rate, blood pressure and correlation signals are used in a predictive mathematical model to estimate patient status or outcome.

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Номер записи: 66
05-03-2015 дата публикации

SYSTEMS AND METHODS FOR RESPIRATION MONITORING

Номер: US20150065829A1
Автор: Paul Stanley Addison, James N. Watson, Scott McGonigle, ADDISON PAUL STANLEY, WATSON JAMES N, MCGONIGLE SCOTT, WATSON JAMES N.
Принадлежит:

According to embodiments, techniques for determining respiratory parameters are disclosed. More suitable probe locations for determining respiratory parameters, such as respiration rate and respiratory effort, may be identified. The most suitable probe location may be selected for probe placement. A scalogram may be generated from the detected signal at the more suitable location, resulting in an enhanced breathing band for determining respiratory parameters. Flexible probes that allow for a patient's natural movement due to respiration may also be used to enhance the breathing components of the detected signal. From the enhanced signal, more accurate and reliable respiratory parameters may be determined. 1. A system for determining a respiratory parameter of a patient , comprising: a first photoplethysmograph (PPG) signal from a first probe location, wherein the first PPG signal comprises a first respiratory component; and', 'a second PPG signal from a second probe location, wherein the second PPG signal comprises a second respiratory component; and, 'one or more probes configured to receive compute a first index for the first probe location, wherein the first index is based at least in part on the first respiratory component, and wherein the first index is indicative of energy level consistency of the first respiratory component over time;', 'compute a second index for the second probe location, wherein the second index is based at least in part on the second respiratory component, and wherein the second index is indicative of energy level consistency of the second respiratory component over time; and', 'select, based at least in part on the first index and the second index, one of the first probe location and the second probe location for determining at least one respiratory parameter., 'a processor configured to2. The system of wherein the processor is additionally configured to determine the at least one respiratory parameter at the selected probe location.3. ...

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Номер записи: 67
24-06-2014 дата публикации

Systems and methods for determining oxygen saturation

Номер: US0008761855B2
Автор: James Nicholas Watson, Paul Stanley Addison, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, NELLCOR PURITAN BENNETT, NELLCOR PURITAN BENNETT IRELAND

According to embodiments, techniques for using continuous wavelet transforms and spectral transforms to determine oxygen saturation from photoplethysmographic (PPG) signals are disclosed. According to embodiments, a first oxygen saturation may be determined from wavelet transformed PPG signals and a second oxygen saturation may be determined from spectral transformed PPG signals. An optimal oxygen saturation may be determined by selecting one of the first and the second oxygen saturation or by combining the first and the second oxygen saturation. According to embodiments, a spectral transform of PPG signals may be performed to identify a frequency region associated with a pulse rate of the PPG signal. A continuous wavelet transform of the PPG signals at a scale corresponding to the identified frequency region may be performed to determine oxygen saturation from the wavelet transformed signal.

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Номер записи: 68
12-05-2011 дата публикации

SYSTEMS AND METHODS FOR PROVIDING SENSOR ARRAYS FOR DETECTING PHYSIOLOGICAL CHARACTERISTICS

Номер: US20110112379A1
Автор: Youzhi Li, Bo Chen, Edward M. McKenna, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett LLC

Systems and methods for determining physiological parameters of a subject using a sensor array. In an embodiment, a sensor array may contain sensor elements for determining multiple physiological parameters. A combination of sensor elements and the physiological parameters determined may be selected based on signals obtained from the sensor elements of the sensor array. A sensor array may be connected to a monitoring device that may select an optimal sensor element or combination of sensor elements and one or more physiological parameters to be determined. The monitoring device may then determine physiological parameters using the selected combination of sensor elements and display information associated with the parameters on a monitor for use, for example, in monitoring a medical patient.

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Номер записи: 69
24-08-2017 дата публикации

SYSTEMS AND METHODS FOR VIDEO-BASED MONITORING OF VITAL SIGNS

Номер: US20170238805A1
Автор: Paul Stanley Addison, David Foo, Dominique Jacquel, ADDISON PAUL STANLEY, FOO DAVID, JACQUEL DOMINIQUE, Addison Paul Stanley, Foo David, Jacquel Dominique
Принадлежит:

The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals. 1. A video-based method of measuring a patient's vital sign , comprising:receiving a video signal from a video camera, the video signal having a field of view that includes exposed skin of a patient;extracting from the video signal a time-varying color signal for each of a plurality of regions, each region including exposed skin of the patient;identifying a frequency content of each color signal;selecting two or more non-adjacent regions that have a shared frequency content comprising a modulation at a shared frequency;combining the color signals of the selected regions;measuring a vital sign from the combined color signal; andoutputting the vital sign for further processing or display.2. The method of claim 1 , wherein combining comprises averaging the color signals from the selected regions.3. The method of claim 2 , wherein the selected regions have different sizes.4. The method of claim 1 , wherein the vital sign comprises heart rate.5. The method of claim 4 , wherein measuring the heart rate comprises accumulating frequency peaks from the combined signal claim 4 , selecting a median frequency claim 4 , and updating a running average heart rate from the selected frequency.6. The method of claim 3 , further comprising updating the selected regions by adding or removing regions from the selected regions based on the frequency content of each region.7. The method of claim 1 , further comprising calculating a statistic of the combined color signal claim 1 , wherein the statistic comprises an amplitude claim 1 , a variability claim 1 , a skew claim 1 , or a ...

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Номер записи: 70
23-12-2010 дата публикации

Fluid Responsiveness Measure

Номер: US20100324827A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: Nellcor Puritan Bennett Ireland

A method and system for measuring fluid responsiveness of a patient is disclosed. Information related to fluid responsiveness of a patient may be derived from a PPG signal, for example, by analyzing the PPG signal transformed by a continuous wavelet transform. Other techniques for deriving information related to fluid responsiveness of a patient include, for example, analyzing the amplitude modulation, frequency modulation, and/or baseline changes of a PPG signal.

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Номер записи: 71
20-04-2017 дата публикации

SYSTEM AND METHOD FOR IDENTIFYING AUTOREGULATION ZONES

Номер: US20170105672A1
Автор: Paul Stanley Addison, James N. Watson, Dean Montgomery, ADDISON PAUL STANLEY, WATSON JAMES N, MONTGOMERY DEAN, Addison Paul Stanley, Watson James N., Montgomery Dean
Принадлежит:

A system configured to monitor autoregulation includes a medical sensor configured to be applied to a patient and to generate a regional oxygen saturation signal. The system includes a controller having a processor configured to receive the regional oxygen saturation signal and a blood pressure signal and to determine a cerebral oximetry index (COx) based on the blood pressure signal and the regional oxygen saturation signal. The processor is also configured to apply a data clustering algorithm to cluster COx data points over a range of blood pressures, identify a first cluster of COx data points that corresponds to an intact autoregulation zone for the patient, and provide a first output indicative of the intact autoregulation zone for the patient. 1. A system configured to monitor autoregulation comprising:a medical sensor configured to be applied to a patient and to generate a regional oxygen saturation signal; receive the regional oxygen saturation signal and a blood pressure signal;', 'determine a cerebral oximetry index (COx) based on the blood pressure signal and the regional oxygen saturation signal;', 'apply a data clustering algorithm to cluster COx data points over a range of blood pressures;', 'identify a first cluster of COx data points that corresponds to an intact autoregulation zone for the patient; and', 'provide a first output indicative of the intact autoregulation zone for the patient., 'a controller comprising a processor configured to2. The system of claim 1 , wherein the processor is configured to identify a second cluster of COx data points that corresponds to an impaired autoregulation zone for the patient and to provide a second output indicative of the impaired autoregulation zone for the patient.3. The system of claim 1 , wherein the processor is configured to identify a boundary between the first cluster and a second cluster and to provide a second output indicative of the boundary.4. The system of claim 1 , wherein the processor is ...

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Номер записи: 72
02-06-2020 дата публикации

Systems and methods for video-based monitoring of vital signs

Номер: US0010667723B2
Автор: Dominique Jacquel, Paul Stanley Addison, David Foo, JACQUEL DOMINIQUE, ADDISON PAUL STANLEY, FOO DAVID, Jacquel, Dominique, Addison, Paul Stanley, Foo, David
Принадлежит: COVIDIEN LP

The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals. Examples include flood fill methods and skin tone filtering methods.

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Номер записи: 73
07-06-2016 дата публикации

Systems and methods for physiological event marking

Номер: US0009357934B2
Автор: James N. Watson, Paul Stanley Addison, Rakesh Sethi, Keith Manning, WATSON JAMES N, ADDISON PAUL STANLEY, SETHI RAKESH, MANNING KEITH, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES N, ADDISON PAUL STANLEY, SETHI RAKESH, MANNING KEITH, NELLCOR PURITAN BENNETT IE, WATSON JAMES N., NELLCOR PURITAN BENNETT IRELAND

Systems and methods are provided for storing event markers. The value of a monitored physiological metric may be monitored and compared to a reference value. A patient monitoring system may compute a difference between a monitored metric and a reference value, and compare the difference to a threshold value to determine whether a physiological event has occurred. Based on the determination, a patient monitoring system may store an event marker, trigger a response, update a metric value, or perform any other suitable function.

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Номер записи: 74
21-01-2010 дата публикации

SYSTEMS AND METHODS FOR PULSE PROCESSING

Номер: US20100016738A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, techniques for using continuous wavelet transforms to process pulses from a photoplethysmographic (PPG) signal are disclosed. The continuous wavelet transform of the PPG signal may be used to identify and characterize features and their periodicities within a signal. Regions, phases and amplitudes within the scalogram associated with these features may then be analyzed to identify, locate, and characterize a true pulse within the PPG signal. Having characterized and located the pulse in the PPG (possibly also using information gained from conventional pulse processing techniques such as, for example, by identifying turning points for candidate pulse maxima and minima on the PPG, frequency peak picking for candidate scales of pulses, etc.), the PPG may be parameterized for ease of future processing.

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Номер записи: 75
07-06-2012 дата публикации

SYSTEMS AND METHODS FOR PHYSIOLOGICAL EVENT MARKING

Номер: US20120143012A1
Автор: James N. Watson, Paul Stanley Addison, Rakesh Sethi, Keith Manning, WATSON JAMES N, ADDISON PAUL STANLEY, SETHI RAKESH, MANNING KEITH, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland

Systems and methods are provided for storing event markers. The value of a monitored physiological metric may be monitored and compared to a reference value. A patient monitoring system may compute a difference between a monitored metric and a reference value, and compare the difference to a threshold value to determine whether a physiological event has occurred. Based on the determination, a patient monitoring system may store an event marker, trigger a response, update a metric value, or perform any other suitable function. 1. A method for providing a physiological event marker , the method comprising:receiving a physiological signal;monitoring using electronic processing equipment at least one value derived from the physiological signal, wherein the at least one value comprises a combination of pulse rate, pulse wave area, pulse statistical moment, and/or DC offset;determining using the electronic processing equipment that a physiological event has occurred based at least in part on the at least one value and based at least in part on at least one corresponding threshold; andstoring the physiological event marker indicative of when the physiological event occurred.2. The method of claim 1 , wherein the combination comprises a weighted sum.3. The method of claim 1 , further comprising triggering an alarm based at least in part on the occurrence of the physiological event.4. The method of claim 1 , further comprising triggering a recalibration of a medical monitoring apparatus based at least in part on the occurrence of the physiological event.5. The method of claim 1 , further comprising recording physiological data beginning at a time based at least in part on the occurrence of the physiological event.6. The method of claim 1 , wherein determining that the physiological event has occurred is based at least in part on a change in the at least one value.7. The method of claim 6 , wherein the at least one corresponding threshold is based at least in part on whether ...

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Номер записи: 76
28-08-2014 дата публикации

SYSTEMS AND METHODS FOR GENERATING AN ARTIFICIAL PHOTOPLETHYSMOGRAPH SIGNAL

Номер: US20140244205A1
Автор: Braddon M. Van Slyke, Ronald Kadlec, Scott McGonigle, Michael Mestek, Paul Stanley Addison, James Nicholas Watson, VAN SLYKE BRADDON M, KADLEC RONALD, MCGONIGLE SCOTT, MESTEK MICHAEL, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, VAN SLYKE BRADDON M.
Принадлежит: Covidien LP

A test unit may generate a pulse signal based on a pulsatile profile and a frequency modulation component of a respiratory profile. A respiration modulated signal may be generated from the pulse signal, an amplitude modulation component, and a baseline modulation component. A patient modulated signal may be generated based on the respiration modulated signal and a patient profile. The artificial PPG signal may be generated based on the patient modulated signal and an artifact profile. The artificial PPG signal may be output to an electronic device. 1. A method for generating an artificial photoplethysmograph (PPG) signal , the method comprising:generating, using the processing equipment, a frequency modulation component, an amplitude modulation component, and a baseline modulation component based on a respiratory profile;generating, using processing equipment, a pulse signal based on a pulsatile profile and the frequency modulation component;modifying, using the processing equipment, the pulse signal based at least in part on the amplitude modulation component and the baseline modulation component to generate a respiration modulated signal; andoutputting the artificial PPG signal based at least in part on the respiration modulated signal.2. The method of claim 1 , wherein generating the pulse signal comprises:generating a heart rate signal based on the pulsatile profile and the frequency modulation component;generating a dichrotic notch signal based on the pulsatile profile and the frequency modulation component; andcombining the heart rate signal and the dichrotic notch signal.3. The method of claim 1 , wherein modifying the pulse signal comprises:multiplying, with a multiplier, the pulse signal and the amplitude modulation component; andcombining, with an adder, the pulse signal and the baseline modulation component to generate the respiration modulated signal.4. The method of claim 3 , further comprising modifying the respiration modulated signal based on a ...

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Номер записи: 77
30-09-2010 дата публикации

SYSTEMS AND METHODS FOR MONITORING PAIN MANAGEMENT

Номер: US20100249556A1
Автор: Rakesh Sethi, Paul Stanley Addison, James N. Watson, Paul A. Edney, SETHI RAKESH, ADDISON PAUL STANLEY, WATSON JAMES N, EDNEY PAUL A, WATSON JAMES N., EDNEY PAUL A.
Принадлежит: Nellcor Puritan Bennett Ireland

The present disclosure relates to systems and methods for monitoring pain management using measurements of physiological parameters based on a PPG signal. A reference physiological parameter may be compared against a later measurement to identify a change in condition that may indicate a pain management problem.

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Номер записи: 78
03-11-2011 дата публикации

SYSTEMS AND METHODS FOR SIGNAL MONITORING USING LISSAJOUS FIGURES

Номер: US20110270579A1
Автор: James N. Watson, Paul Stanley Addison, WATSON JAMES N, ADDISON PAUL STANLEY, WATSON JAMES N.
Принадлежит: Nellcor Puritan Bennett Ireland

Methods and systems are provided for generating Lissajous figures based on monitored signals and identifying features of Lissajous figures. Features may include similarity metrics, shape change metrics and noise metrics, and may be used to determine information about the monitored signal. Features may also be used in monitoring operations, such as measurement quality assessment and recalibration.

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Номер записи: 79
20-12-2011 дата публикации

Low perfusion signal processing systems and methods

Номер: US0008082110B2
Автор: James Nicholas Watson, Paul Stanley Addison, Edward M. McKenna, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, MCKENNA EDWARD M, MCKENNA EDWARD M.
Принадлежит: Nellcor Puritan Bennett Ireland, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, MCKENNA EDWARD M, NELLCOR PURITAN BENNETT IE, MCKENNA EDWARD M., NELLCOR PURITAN BENNETT IRELAND

In some embodiments, systems and methods for identifying a low perfusion condition are provided by transforming a signal using a wavelet transform to generate a scalogram. A pulse band and adjacent marker regions in the scalogram are identified. Characteristics of the marker regions are used to detect the existence of a lower perfusion condition. If such a condition is detected, an event may be triggered, such as an alert or notification.

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Номер записи: 80
31-12-2009 дата публикации

Systems And Methods For Processing Signals With Repetitive Features

Номер: US20090326388A1
Автор: James Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland

The present disclosure relates to systems and methods for detecting features of a signal. According to embodiments, by transposing segments of a signal, such as segments representing pulses in a PPG signal, such that they are stacked next to each other, various characteristics about the signal may be discerned such as information about repetitive features of the signal. According to an embodiment, from a PPG signal respiration information may be determined about individual breaths, blood pressure changes may be determined, and information about other physiological parameters affecting the PPG signal may be determined.

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Номер записи: 81
21-01-2010 дата публикации

SYSTEMS AND METHODS FOR COMPUTING A PHYSIOLOGICAL PARAMETER USING CONTINUOUS WAVELET TRANSFORMS

Номер: US20100016692A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, systems and methods for computing a physiological parameter are provided. The physiological parameter may be calculated using a continuous wavelet transform technique as well as using a non-continuous wavelet transform technique. More than one value for the physiological parameter may be calculated using various techniques. The values may be evaluated to select a desired value, or an average or weighted average of the values may be computed to generate a desired value.

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Номер записи: 82
21-01-2010 дата публикации

Systems and Methods Using Induced Perturbation to Determine Physiological Parameters

Номер: US20100016734A1
Автор: Rakesh Sethi, Paul Stanley Addison, James Nicholas Watson
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, systems and methods for non-invasive blood pressure monitoring are disclosed. An exciter may induce perturbations in a subject, and a sensor or probe may be used to obtain a detected signal from the subject. The detected signal may then be used to measure one or more physiological parameters of the patient. For example if the perturbations are based on a known signal, any differences between the known signal and the input signal may be attributable to the patient's physiological parameters. A phase drift between the perturbation signal and the detected signal may be determined from a comparison of the scalograms of the exciter location and the sensor or probe location. From the scalogram comparison, more accurate and reliable physiological parameters may be determined.

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Номер записи: 83
01-01-2013 дата публикации

Systems and methods for estimating values of a continuous wavelet transform

Номер: US0008346333B2
Автор: James Nicholas Watson, Paul Stanley Addison, Braddon M. Van Slyke, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, VAN SLYKE BRADDON M, VAN SLYKE BRADDON M.
Принадлежит: Nellcor Puritan Bennett Ireland, NELLCOR PURITAN BENNETT IE, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY, VAN SLYKE BRADDON M, NELLCOR PURITAN BENNETT IRELAND, VAN SLYKE BRADDON M.

According to embodiments, techniques for estimating scalogram energy values in a wedge region of a scalogram are disclosed. A pulse oximetry system including a sensor or probe may be used to receive a photoplethysmograph (PPG) signal from a patient or subject. A scalogram, corresponding to the obtained PPG signal, may be determined. In an arrangement, energy values in the wedge region of the scalogram may be estimated by calculating a set of estimation locations in the wedge region and estimating scalogram energy values at each location. In an arrangement, scalogram energy values may be estimated based on an estimation scheme and by combining scalogram values in a vicinity region. In an arrangement, the vicinity region may include energy values in a resolved region of the scalogram and previously estimated energy values in the wedge region of the scalogram. In an arrangement, one or more signal parameters may be determined based on the resolved and estimated values of the scalogram.

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Номер записи: 84
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046184A1
Автор: Paul Stanley Addison, James Nicholas Watson
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.

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Номер записи: 85
11-11-2010 дата публикации

USING COLORED PROBES IN PATIENT MONITORING

Номер: US20100286494A1
Автор: Paul Stanley Addison, James Watson, Rakesh Sethi
Принадлежит: Nellcor Puritan Bennett Ireland

The present disclosure provides a sensor with color-coded indications that various patient physiological parameters are being monitored, such as blood oxygen saturation, blood pressure, respiration rate, and respiration effort. The sensor may sense a physical characteristic used to monitor the physiological parameter, and a visible light emitter emits visible light of a first color that is color-coded to the physiological parameter, but is not used to sense the physical characteristic. The visible light emitter may emit visibly flashing light in response to the sensor sensing a threshold value of the physical characteristic. The sensor may include a second light emitter that may sense the physical characteristic, and may emit light of a second color that is color-coded to a first or second physiological parameter. In some embodiments, the first and second colors may visibly mix. The first and second visible light emitters may emit light independently, including visibly flashing light.

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Номер записи: 86
25-06-2024 дата публикации

Systems and methods for video-based monitoring of vital signs

Номер: US0012016674B2
Автор: Dominique Jacquel, Paul Stanley Addison, David Foo
Принадлежит: Covidien LP

The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals. Examples include flood fill methods and skin tone filtering methods.

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Номер записи: 87
28-01-2014 дата публикации

Systems and methods for processing physiological signals in wavelet space

Номер: US0008636667B2
Автор: James P. Ochs, Paul Stanley Addison, James Nicholas Watson, OCHS JAMES P, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, OCHS JAMES P.
Принадлежит: Nellcor Puritan Bennett Ireland, OCHS JAMES P, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, NELLCOR PURITAN BENNETT IE, OCHS JAMES P., NELLCOR PURITAN BENNETT IRELAND

Methods and systems are disclosed for analyzing multiple scale bands in the scalogram of a physiological signal in order to obtain information about a physiological process. An analysis may be performed to identify multiple scale bands that are likely to contain the information sought. Each scale band may be assessed to determine a band quality, and multiple bands may be combined based on the band quality. Information about a physiological process may determined based on the combined band. In an embodiment, analyzing multiple scale bands in a scalogram arising from a wavelet transformation of a photoplethysmograph signal may yield clinically relevant information about, among other things, the blood oxygen saturation of a patient.

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Номер записи: 88
29-01-2013 дата публикации

Estimating transform values using signal estimates

Номер: US0008364225B2
Автор: Paul Stanley Addison, James Nicholas Watson, Braddon M. Van Slyke, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, VAN SLYKE BRADDON M, VAN SLYKE BRADDON M.
Принадлежит: Nellcor Puritan Bennett Ireland, NELLCOR PURITAN BENNETT IE, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, VAN SLYKE BRADDON M, NELLCOR PURITAN BENNETT IRELAND, VAN SLYKE BRADDON M.

According to embodiments, estimated values for a signal transform may be generated using estimated values for the signal. Signal parameters may then be determined based on the estimated signal transform. A first portion of a signal may be obtained. A second portion of the signal may be estimated. The second portion of the signal may correspond to a portion of the that is unknown, that is not yet available and/or that is obscured by noise and/or artifacts. A transform (e.g., a continuous wavelet transform) of both of the signal portions may be performed. One or more parameters corresponding to the signal may then be determined from transformed signal.

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Номер записи: 89
28-11-2017 дата публикации

Using colored probes in patient monitoring

Номер: US0009826905B2
Автор: Paul Stanley Addison, James Watson, Rakesh Sethi, ADDISON PAUL STANLEY, WATSON JAMES, SETHI RAKESH, Addison Paul Stanley, Watson James, Sethi Rakesh
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES, SETHI RAKESH, NELLCOR PURITAN BENNETT IE, Addison Paul Stanley, Watson James, Sethi Rakesh

The present disclosure provides a sensor with color-coded indications that various patient physiological parameters are being monitored, such as blood oxygen saturation, blood pressure, respiration rate, and respiration effort. The sensor may sense a physical characteristic used to monitor the physiological parameter, and a visible light emitter emits visible light of a first color that is color-coded to the physiological parameter, but is not used to sense the physical characteristic. The visible light emitter may emit visibly flashing light in response to the sensor sensing a threshold value of the physical characteristic. The sensor may include a second light emitter that may sense the physical characteristic, and may emit light of a second color that is color-coded to a first or second physiological parameter. In some embodiments, the first and second colors may visibly mix. The first and second visible light emitters may emit light independently, including visibly flashing light.

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Номер записи: 90
26-12-2017 дата публикации

Apnea analysis system and method

Номер: US0009848820B2
Автор: Bo Chen, Michael L. Mestek, Ron J. Kadlec, Niranjan Maharajh, Mark E. Kolnsberg, Corinne H. Johnson, James P. Ochs, Paul Stanley Addison, James N. Watson, CHEN BO, MESTEK MICHAEL L, KADLEC RON J, MAHARAJH NIRANJAN, KOLNSBERG MARK E, JOHNSON CORINNE H, OCHS JAMES P, ADDISON PAUL STANLEY, WATSON JAMES N, Chen Bo, Mestek Michael L., Kadlec Ron J., Maharajh Niranjan, Kolnsberg Mark E., Johnson Corinne H., Ochs James P., Addison Paul Stanley, Watson James N.
Принадлежит: COVIDIEN LP, Covidien LP

An apnea analysis system may include a photoplethysmographic (PPG) sub-system, a breath detection sub-system, and an apnea analysis module. An apnea analysis system includes a photoplethysmographic (PPG) sub-system, a breath detection sub-system, and an apnea analysis module. The PPG sub-system is configured to be operatively connected to an individual and output a PPG signal from the individual. The breath detection sub-system is configured to be operatively connected to the individual and output a breath signal from the individual. The apnea analysis module is in communication with the PPG sub-system and the breath detection sub-system. The apnea analysis module analyzes the breath signal and a respiratory component of the PPG signal and, based on the analysis, identifies a presence of apnea, differentiates between obstructive apnea and central apnea, and provides an indication of the identified apnea.

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Номер записи: 91
08-04-2010 дата публикации

REDUCING CROSS-TALK IN A MEASUREMENT SYSTEM

Номер: US20100087714A1
Автор: James Watson, Paul Stanley Addison, WATSON JAMES, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, techniques for determining one or more physiological characteristics in a measurement system which may include cross-talk are disclosed. A sensor or probe may be used to generate two or more a plethysmograph or photoplethysmograph (PPG) signals from a patient. The obtained signals may include an infrared signal and a red signal, and may be subject to an additional measurement noise. The obtained signal may be combined to form a detected signal. The detected signal may be filtered to partially or fully remove noise. The filtered detected signal may be demodulated to separate the red signal and the infrared signal. The recovered red and infrared signals may be processed by additional filters to partially or fully remove cross-talk. The processed red and infrared signals may then be used to determine physiological characteristics of a patient such as a pulse rate, a respiration rate, and a blood oxygen saturation level using the wavelet transform and/or scalogram ...

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Номер записи: 92
09-10-2012 дата публикации

Systems and methods for identifying pulse rates

Номер: US0008285352B2
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Nellcor Puritan Bennett LLC, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS, NELLCOR PURITAN BENNETT LLC

According to embodiments, techniques for using continuous wavelet transforms and spectral transforms to identify pulse rates from a photoplethysmographic (PPG) signal are disclosed. According to embodiments, candidate pulse rates of the PPG signal may be identified from a wavelet transformed PPG signal and a spectral transformed PPG signal. A pulse rate may be determined from the candidate pulse rates by selecting one of the candidate pulse rates or by combining the candidate pulse rates. According to embodiments, a spectral transform of a PPG signal may be performed to identify a frequency region associated with a pulse rate of the PPG signal. A continuous wavelet transform of the PPG signal at a scale corresponding to the identified frequency region may be performed to determine a pulse rate from the wavelet transformed signal.

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Номер записи: 93
17-05-2011 дата публикации

Systems and methods for a wavelet transform viewer

Номер: US0007944551B2
Автор: Paul Stanley Addison, James Watson, ADDISON PAUL STANLEY, WATSON JAMES
Принадлежит: Nellcor Puritan Bennett Ireland, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

Techniques for the display of a signal with a wavelet transform of that signal in a wavelet transform viewer are disclosed, according to embodiments. According to embodiments, the wavelet transform viewer can display a plot of physiological signals such as a photoplethysmograph (PPG) signal. A portion of the plot of the signal can be selected. A wavelet transform the selected portion of the signal can be calculated and a wavelet plot of the tranformed signal can be displayed simultaneously with that signal. A plot of the selected portion of the signal can also be simultaneously displayed with both the plot of the signal and the wavelet plot.

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Номер записи: 94
16-01-2014 дата публикации

SYSTEMS AND METHODS FOR RIDGE SELECTION IN SCALOGRAMS OF SIGNALS

Номер: US20140016840A1
Автор: James Watson, Paul Stanley Addison, David Clifton, WATSON JAMES, ADDISON PAUL STANLEY, CLIFTON DAVID
Принадлежит: Nellcor Puritan Bennett Ireland

According to embodiments, systems, devices, and methods for ridge selection in scalograms are disclosed. Ridges or ridge components are features within a scalogram which may be computed from a signal such as a physiological (e.g., photoplethysmographic) signal. Ridges may be identified from one or more scalograms of the signal. Parameters characterizing these ridges may be determined. Based at least in part on these parameters, a ridge density distribution function is determined. A ridge is selected from analyzing this ridge density distribution function. In some embodiments, the selected ridge is used to determine a physiological parameter such as respiration rate. 1. A method for determining a physiological parameter , the method comprising:generating at least one scalogram based at least in part on a wavelet transform of an input signal;identifying ridges in the at least one scalogram;determining at least one ridge parameter for the identified ridges;characterizing the identified ridges as a function of scale, wherein the characterizing is based at least in part on the at least one ridge parameter for the identified ridges; anddetermining a physiological parameter based at least in part on the characterizing of the identified ridges.2. The method of further comprising:determining at least one ridge relationship parameter for the identified ridges; andcharacterizing the identified ridges based at least in part on the at least one ridge parameter for a given scale and based at least in part on the at least one ridge relationship parameter.3. The method of claim 2 , wherein the at least one ridge relationship parameter is a correlation between a first identified ridge and a second identified ridge of the identified ridges.4. The method of claim 2 , wherein the at least one ridge relationship parameter is a degree of cohesion between a first identified ridge and a second identified ridge of the identified ridges.5. The method of claim 1 , wherein characterizing the ...

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Номер записи: 95
13-03-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING STROKE VOLUME OF A PATIENT

Номер: US20140073962A1
Автор: Paul Stanley Addison, James Nicholas Watson, ADDISON PAUL STANLEY, WATSON JAMES NICHOLAS
Принадлежит: Nellcor Puritan Bennett LLC

A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time. 1. A photoplethysmogram (PPG) system for determining a stroke volume of a patient , the PPG system comprising:a PPG sensor configured to be secured to an anatomical portion of the patient, wherein the PPG sensor is configured to sense a physiological characteristic of the patient; anda monitor operatively connected to the PPG sensor, the monitor receiving a PPG signal from the PPG sensor, wherein the PPG signal includes a primary peak separated from a trailing peak by a dichrotic notch, the monitor comprising a pulse trending module configured to determine a slope transit time of an upslope of the primary peak of the PPG signal, the pulse trending module configured to determine a stroke volume as a function of the slope transit time.2. The PPG system of claim 1 , wherein the slope transit time is calculated based upon an inverse of a gradient of the upslope of the primary peak of the PPG signal.3. The PPG system of claim 1 , wherein the slope transit time is calculated by the pulse trending module as a temporal gradient of the PPG signal.4. The PPG system of claim 1 , wherein the slope transit time is calculated by the pulse trending module as an inverse of a gradient of the upslope of the primary peak of the PPG signal.5. The PPG system of claim 1 , wherein the PPG signal forms a PPG waveform claim 1 , the pulse trending module analyzing a contour of the PPG waveform along ...

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Номер записи: 96
06-03-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING STROKE VOLUME OF AN INDIVIDUAL

Номер: US20140066785A1
Автор: James Nicholas Watson, Paul Stanley Addison, WATSON JAMES NICHOLAS, ADDISON PAUL STANLEY
Принадлежит: Nellcor Puritan Bennett LLC

A system for determining stroke volume of an individual. The system includes a skew-determining module that is configured to calculate a first derivative of photoplethysmogram (PPG) signals of the individual. The first derivative forms a derivative waveform. The skew-determining module is configured to determine a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one pulse wave detected from blood flow of the individual in the derivative waveform. The system also includes an analysis module that is configured to determine a stroke volume of the individual. The stroke volume is a function of the skew metric of the first derivative. 1. A system for determining stroke volume of an individual , the system comprising:a skew-determining module configured to calculate a first derivative of photoplethysmogram (PPG) signals of the individual, the first derivative forming a derivative waveform, the skew-determining module configured to determine a skew metric of the first derivative, wherein the skew metric is indicative of a morphology of at least one pulse wave detected from blood flow of the individual in the derivative waveform; andan analysis module configured to determine a stroke volume of the individual, the stroke volume being a function of the skew metric of the first derivative.2. The system of claim 1 , wherein the skew metric is determined for each pulse wave or from a pulse-ensemble average that is based on a plurality of the pulse waves.3. The system of claim 1 , further comprising an identification module that identifies individual pulse waves from at least one of the derivative waveform or a PPG waveform that is formed by the PPG signals claim 1 , wherein the pulse waves are approximately defined from a first upstroke to a second claim 1 , adjacent upstroke in the corresponding waveform claim 1 , each the first and second upstrokes corresponding to an increase in blood volume caused by a heartbeat.4. The ...

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Номер записи: 97
13-12-2011 дата публикации

Methods and systems for discriminating bands in scalograms

Номер: US0008077297B2
Автор: Paul Stanley Addison, James Watson, David Clifton, ADDISON PAUL STANLEY, WATSON JAMES, CLIFTON DAVID
Принадлежит: Nellcor Puritan Bennett Ireland, ADDISON PAUL STANLEY, WATSON JAMES, CLIFTON DAVID, NELLCOR PURITAN BENNETT IE, NELLCOR PURITAN BENNETT IRELAND

The present disclosure is directed towards embodiments of systems and methods for discriminating (e.g., masking out) scale bands that are determined to be not of interest from a scalogram derived from a continuous wavelet transform of a signal. Techniques for determining whether a scale band is not of interest include, for example, determining whether a scale band's amplitude is being modulated by one or more other bands in the scalogram. Another technique involves determining whether a scale band is located between two other bands and has energy less than that of its neighboring bands. Another technique involves determining whether a scale band is located at about half the scale of another, more dominant (i.e., higher energy) band.

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Номер записи: 98
06-04-2017 дата публикации

SYSTEM AND METHOD FOR MONITORING AUTOREGULATION UTILIZING NORMALIZED REGIONAL OXYGEN SATURATION VALUES

Номер: US20170095161A1
Автор: Paul Stanley Addison, James N. Watson, Dean Montgomery, ADDISON PAUL STANLEY, WATSON JAMES N, MONTGOMERY DEAN, Addison Paul Stanley, Watson James N., Montgomery Dean
Принадлежит:

A method for monitoring autoregulation includes, using a processor, receiving a blood pressure signal an oxygen saturation signal, and a regional oxygen saturation signal from a patient. The method also includes normalizing the regional oxygen saturation signal to correct for variation in the oxygen saturation signal based on a relationship between the oxygen saturation signal and the regional oxygen saturation signal. The method further includes determining a linear correlation between the blood pressure signal and the normalized regional oxygen saturation signal. The method still further includes providing a signal indicative of the patient's autoregulation status to an output device based on the linear correlation. 1. A method for monitoring autoregulation , comprising: receiving a blood pressure signal, an oxygen saturation signal, and a regional oxygen saturation signal from a patient;', 'normalizing the regional oxygen saturation signal to correct for variation in the oxygen saturation signal based on a relationship between the oxygen saturation signal and the regional oxygen saturation signal;', 'determining a linear correlation between the blood pressure signal and the normalized regional oxygen saturation signal; and', "providing a signal indicative of the patient's autoregulation status to an output device based on the linear correlation."], 'utilizing a processor to execute one or more routines encoded on a memory for2. The method of claim 1 , comprising providing a cerebral oximetry index value to the output device.3. The method of claim 2 , comprising providing a normalized regional oxygen saturation value derived from the normalized regional oxygen saturation signal to the output device.4. The method of claim 3 , comprising providing a regional oxygen saturation value derived from the regional oxygen saturation signal and corresponding to the normalized regional oxygen saturation value to the output device.5. The method of claim 1 , comprising ...

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Номер записи: 99
31-12-2009 дата публикации

Signal Processing Mirroring Technique

Номер: US20090326351A1
Автор: Paul Stanley Addison, James Watson
Принадлежит: Nellcor Puritan Bennett Ireland

Embodiments may include systems and methods capable of processing an original signal by selecting and mirroring portions of the signal to create a new signal for further analysis. In an embodiment, the signal may be a photoplethysmograph (PPG) signal and the new signal may be further analyzed using continuous wavelet transforms. Any suitable number of reconstructed new signals may be created from the original signal and scalograms may be derived at least in part from the new signals. Ridges may be extracted from the scalograms of the new signals and secondary scalograms may be further derived from the ridges. A sum along amplitudes technique may be applied to a selected scalogram and may be plotted as a function of the scale of the scalogram. Desired information, such as respiration information within the original signal, may be identified from the plot.

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Номер записи: 100
02-02-2012 дата публикации

Systems and methods for processing multiple physiological signals

Номер: US20120029320A1
Автор: James N. Watson, Paul Stanley Addison, Robert S. Stoughton
Принадлежит: Nellcor Puritan Bennett LLC

Systems and methods are provided for patient monitors which apply different sets of signal processing operations to signals to identify multiple fiducials in physiological signals. PPG signals measured at two sensor sites may be processed with a first set of processing operations and analyzed to identify fiducials that allow the calculation of a diastolic DPTT. These PPG signals may then be processed with a different set of processing operations and the results analyzed to identify fiducials that allow the calculation of a systolic DPTT.

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Номер записи: 101
10-05-2012 дата публикации

SYSTEMS AND METHODS FOR PRODUCING AUDIBLE INDICATORS THAT ARE REPRESENTATIVE OF MEASURED BLOOD PRESSURE

Номер: US20120116235A1
Автор: Addison Paul Stanley, Galen Peter, Trumble David, Watson James N.
Принадлежит: Nellcor Puritan Bennett LLC

Systems and methods are disclosed for producing audible indicators that are based on a subject's measured blood pressure. Audible properties of the indicators are processed to represent blood pressure. For example, the duration or volume of the audible indicators may be varied based on the values of the subject's blood pressure. The audible indicators may further be varied based on the subject's blood pressure's deviation from a normal blood pressure and/or previously calculated blood pressure. For example, the audible indicators may be indicative of changes in the subject's blood pressure over time. The audible indicators representing blood pressure may be synchronized with other audible indicators that represent other physiological parameters of the subject, such as, the subject's heart rate. 1. A method for providing audible indicators of blood pressure of a subject , comprising:receiving data representative of the blood pressure of the subject from a sensor;determining the subject's blood pressure based on the received data using a processor; andproducing an audible indicator that comprises at least one audible property that is based at least in part on the determined blood pressure.2. The method of claim 1 , wherein the at least one audible property that is based at least in part on the determined blood pressure comprises at least one of a duration and a volume of the audible indicator.3. The method of claim 1 , wherein the at least one audible property that is based at least in part on the determined blood pressure comprises a depth of modulation of the audible indicator.4. The method of claim 1 , wherein the audible indicator comprises a first and a second audible indicator claim 1 , and wherein the first audible indicator is representative of systolic blood pressure and the second audible indicator is representative of diastolic blood pressure.5. The method of claim 1 , wherein the audible indicator is synchronized with another measured physiological ...

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Номер записи: 102
31-05-2012 дата публикации

Systems and methods for calibrating physiological signals with multiple techniques

Номер: US20120136261A1
Автор: Addison Paul Stanley, Campbell Shannon E., Lisogurski Daniel, McKenna Edward M., Sethi Rakesh, Stoughton Robert, Watson James N.
Принадлежит: Nellcor Puritan Bennett LLC

Systems and methods are disclosed herein for calibrating the calculation of physiological parameters. Two or more calibration techniques may be used to determine a relationship between physiological measurements and a desired physiological parameter, such as a relationship between differential pulse transit time (DPTT) and blood pressure. Different calibration techniques may be used in a serial fashion, one after the other, or in a parallel fashion, with different weights accorded to each calibration technique. When physiological or other changes occur, the calibration data may be stored for later use and new calibration data may be generated. 1. A method for measuring blood pressure of a subject , comprising:determining, with a processor executing a first calibration technique, first calibration data for use in determining blood pressure;determining, with a processor executing a second calibration technique, second calibration data for use in determining blood pressure, wherein the second calibration technique is different from the first calibration technique;measuring a differential pulse transit time; anddetermining, with a processor, the blood pressure of the subject based at least in part on the differential pulse transit time and at least one of the first calibration data and the second calibration data.2. The method of claim 1 , wherein the first calibration technique is based at least in part on at least one of inter-patient empirical data claim 1 , intra-patient empirical data claim 1 , gravity-based calibration data claim 1 , and respiration-based calibration data.3. The method of claim 1 , wherein the first calibration data and the second calibration data are determined substantially simultaneously.4. The method of claim 1 , wherein the first calibration data is determined substantially before the second calibration data is determined.5. The method of claim 1 , wherein the blood pressure is determined based at least in part on a weighted combination of ...

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Номер записи: 103
31-05-2012 дата публикации

METHODS AND SYSTEMS FOR RECALIBRATING A BLOOD PRESSURE MONITOR WITH MEMORY

Номер: US20120136605A1
Автор: Addison Paul Stanley, Watson James N.
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

Systems and methods are provided for storing and recalling metrics associated with physiological signals. It may be determined that the value of a monitored physiological metric corresponds to a stored value. In such cases, a patient monitor may determine that a calibration is not desired. In some cases, a patient monitor may recall calibration parameters associated with the stored value if it determined that the stored value corresponds to the monitored metric value. 1. A method for calibrating a blood pressure monitor , the method comprising:receiving a photoplethysmograph (PPG) signal;monitoring a value of at least one metric derived at least in part from the PPG signal;comparing the value of the metric to a stored value;determining based at least in part on the comparison whether the value of the metric corresponds to the stored value; anddetermining whether to update current calibration parameters of the blood pressure monitor based at least in part on the comparison.2. The method of claim 1 , wherein the determining whether to update current calibration parameters further comprises determining whether to update the current calibration parameters based further at least in part on whether current calibration parameters correspond to stored calibration parameters associated with the stored value claim 1 , the method further comprising:updating the current calibration parameters with the stored calibration parameters if it is determined that the current calibration parameters do not correspond to the stored calibration parameters; andretaining the current calibration parameters if it is determined that the current calibration parameters correspond to the stored calibration parameters.3. The method of claim 1 , wherein the stored value is catalogued in the database.4. The method of claim 1 , wherein the stored value is stored at time when a calibration of the blood pressure monitor is performed.5. The method of claim 2 , wherein updating the calibration parameter ...

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Номер записи: 104
07-06-2012 дата публикации

SYSTEMS AND METHODS FOR DETERMINING WHEN TO MEASURE A PHYSIOLOGICAL PARAMETER

Номер: US20120143067A1
Автор: Addison Paul Stanley, Manning Keith, Sethi Rakesh, Watson James N.
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

Systems and methods are provided for determining when to update a blood pressure measurement. The value of a physiological metric may be monitored and compared to a reference value. A patient monitoring system may compute a difference between a monitored metric and a reference value, and compare the difference to a threshold value to determine whether to update a blood pressure measurement. The threshold value may be constant or variable, and may depend on the monitored metric. 1. A method for monitoring blood pressure (BP) , the method comprising:(a) determining using an electronic processor a current BP measurement using a non-invasive blood pressure (NIBP) device;(b) associating a reference metric value with the current BP measurement;(c) monitoring a metric value based at least in part on a continuous noninvasive technique;(d) computing a difference based at least in part on a monitored metric value and the reference metric value; and(e) updating the current BP measurement using the NIBP device when the difference exceeds a threshold.2. The method of claim 1 , wherein the metric value comprises a combination of differential pulse transit time (DPTT) claim 1 , pulse rate claim 1 , pulse wave area claim 1 , pulse statistical moment claim 1 , pulse wave centroid claim 1 , rotational moments claim 1 , pulse wave fiducial positions claim 1 , and/or DC offset.3. The method of claim 1 , wherein the threshold is based at least in part on the current blood pressure measurement.4. The method of claim 1 , wherein the threshold is directly proportional to the monitored metric value.5. The method of claim 1 , wherein the threshold value is based at least in part on the relative magnitudes of the monitored metric value and the reference metric value.6. The method of claim 1 , wherein the threshold is based at least in part on user input.7. The method of claim 1 , wherein the monitored metric value is based at least in part on a photoplethysmograph (PPG) signal.8. The method ...

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Номер записи: 105
04-10-2012 дата публикации

METHODS AND SYSTEMS FOR PASSIVE PHOTOPLETHYSMOGRAPH SENSING

Номер: US20120253141A1
Автор: Addison Paul Stanley, Manning Keith, Watson James N.
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

Systems and methods are provided for passive photoplethysmograph sensing. A patient monitoring system may provide active sensing, passive sensing, or both. In some cases, a patient monitor may determine whether to provide passive or active sensing. Passive photoplethysmograph sensing may be used to determine physiological information such as pulse rate, respiration rate, or other information. Passive photoplethysmograph sensing may allow for reduced power consumption relative to active sensing. 1. A method for passive physiological sensing , the method comprising:receiving at least one passive photonic signal from a subject using at least one photodetector; anddetermining, using at least one processing device, physiological information of the subject based at least in part on the at least one passive photonic signal.2. The method of claim 1 , further comprising optically filtering the at least one passive photonic signal.3. The method of claim 1 , wherein physiological information comprises a respiration rate claim 1 , a change in respiration rate claim 1 , a pulse rate claim 1 , a change in pulse rate claim 1 , and/or a SPO2 claim 1 , and/or a combination thereof.4. The method of claim 1 , wherein the receiving at least one photonic signal using at least one photodetector comprises receiving a plurality of photonic signals using a plurality of photodetectors arranged in an array.5. The method of claim 4 , further comprising optically filtering the received photonic signal at one or more photodetectors of the plurality of photodetectors in the array.6. The method of claim 1 , wherein the at least one passive photonic signal from the subject comprises electromagnetic radiation emitted from the subject claim 1 , electromagnetic radiation transmitted through the subject claim 1 , and/or electromagnetic radiation reflected from the subject claim 1 , and/or a combination thereof.7. The method of claim 1 , further comprising:determining whether to provide active sensing ...

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Номер записи: 106
01-11-2012 дата публикации

Signal Procesing Systems and Methods Using Basis Functions and Wavelet Transforms

Номер: US20120278001A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems and methods are provided that use continuous wavelet transforms and basis functions to provide an optimized system for the determination of physiological information. In an embodiment, the basis functions may be used to refine an area of interest in the signal in frequency or in time, and the continuous wavelet transform may be used to identify a maxima ridge in the scalogram at scales with characteristic frequencies proximal to the frequency or frequencies of interest. In another embodiment, a wavelet transform may be used to identify regions of a signal with the morphology of interest while basis functions may be used to focus on these regions to determine or filter information of interest. In yet another embodiment, basis functions and continuous wavelet transforms may be used concurrently and their results combined to form optimized information or a confidence metric for determined physiological information. 1. A method for determining physiological information comprising:receiving, using a processor, a signal;generating, using the processor, first information about the signal using a wavelet transform of the signal for a plurality of scales;generating, using the processor, second information about the signal using a plurality of basis functions; andcombining, using the processor, the first information and the second information to determine the physiological information.2. The method of claim 1 , further comprising determining a confidence metric based on the first information and the second information claim 1 , wherein combining the first information and second information comprises combining the first information and second information based on the confidence metric.3. The method of claim 1 , wherein combining the first information and the second information comprises averaging the first information and the second information.4. The method of claim 3 , wherein averaging the first information and the second information ...

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Номер записи: 107
08-11-2012 дата публикации

Signal Procesing Systems and Methods Using Basis Functions and Wavelet Transforms

Номер: US20120283536A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems and methods are provided that use continuous wavelet transforms and basis functions to provide an optimized system for the determination of physiological information. In an embodiment, the basis functions may be used to refine an area of interest in the signal in frequency or in time, and the continuous wavelet transform may be used to identify a maxima ridge in the scalogram at scales with characteristic frequencies proximal to the frequency or frequencies of interest. In another embodiment, a wavelet transform may be used to identify regions of a signal with the morphology of interest while basis functions may be used to focus on these regions to determine or filter information of interest. In yet another embodiment, basis functions and continuous wavelet transforms may be used concurrently and their results combined to form optimized information or a confidence metric for determined physiological information. 1. A system for determining physiological information comprising: receive a signal;', 'select an area of interest in the received signal;', 'perform a wavelet transform of the signal for a plurality of scales selected based at least in part on the area of interest;', 'use a basis function to generate information about the signal based at least in part on the information generated using the wavelet transform; and', 'determine the physiological information based at least in part on the basis function., 'a processor configured to2. The system of claim 1 , wherein the area of interest is a window in frequency about a maxima ridge in the signal proximal to an estimate of a pulse rate.3. The system of claim 1 , wherein the processor is further configured to determine an optimized piece of physiological information based at least in part on the information generated by the basis functions and the wavelet transform.4. The system of claim 3 , wherein the processor is further configured to calculate a confidence measure based on a ...

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Номер записи: 108
29-11-2012 дата публикации

Methods and systems for filtering a signal according to a signal model and continuous wavelet transform techniques

Номер: US20120302895A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland ULC

According to embodiments, systems and methods are provided for filtering a signal. A first reference signal may be generated according to a signal model and a second reference signal may be generated by analyzing a continuous wavelet transform of a signal. The first and second reference signals may then both be applied to an input signal to filter the input signal according to the components of both of the reference signals.

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Номер записи: 109
10-01-2013 дата публикации

Systems and Methods for Ridge Selection in Scalograms of Signals

Номер: US20130011032A1
Автор: Addison Paul Stanley, CLIFTON David, Watson James
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

According to embodiments, systems, devices, and methods for ridge selection in scalograms are disclosed. Ridges or ridge components are features within a scalogram which may be computed from a signal such as a physiological (e.g., photoplethysmographic) signal. Ridges may be identified from one or more scalograms of the signal. Parameters characterizing these ridges may be determined Based at least in part on these parameters, a ridge density distribution function is determined A ridge is selected from analyzing this ridge density distribution function. In some embodiments, the selected ridge is used to determine a physiological parameter such as respiration rate. 1. A device for determining a physiological parameter , the device comprising: transforming an input signal at least in part using a wavelet transform to generate a transformed signal;', 'generating a first wavelet scalogram based at least in part on the transformed signal;', 'detecting ridges within a region of the first wavelet scalogram;', 'determining one or more parameters for the detected ridges;', 'determining a ridge density distribution function based at least in part on the one or more parameters; and', 'selecting a ridge based at least in part on the ridge having a scale corresponding to a maximum value of the ridge density distribution function., 'a processor capable of2. The device of claim 1 , wherein the signal is a photoplesthysmographic signal.3. The device of claim 1 , wherein the processor is capable of filtering the first wavelet scalogram.4. The device of claim 1 , wherein the processor is further configured to generate a second wavelet scalogram based at least in part on a signal derived from the first wavelet scalogram and detect ridges within a region of the second wavelet scalogram.5. The device of claim 1 , wherein the parameters of the detected ridges comprise ridge power claim 1 , ridge energy claim 1 , ridge energy density claim 1 , ridge amplitude variability claim 1 , ridge ...

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Номер записи: 110
14-02-2013 дата публикации

Methods and Systems for Discriminating Bands in Scalograms

Номер: US20130041240A1
Автор: Addison Paul Stanley, CLIFTON David, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

The present disclosure is directed towards embodiments of systems and methods for discriminating (e.g., masking out) scale bands that are determined to be not of interest from a scalogram derived from a continuous wavelet transform of a signal. Techniques for determining whether a scale band is not of interest include, for example, determining whether a scale band's amplitude is being modulated by one or more other bands in the scalogram. Another technique involves determining whether a scale band is located between two other bands and has energy less than that of its neighboring bands. Another technique involves determining whether a scale band is located at about half the scale of another, more dominant (i.e., higher energy) band. 1. A method comprising:receiving a light intensity signal indicative of light attenuated by body tissue of a subject;performing, using a processor, a wavelet transform based at least in part on the light intensity signal;generating, using the processor, a scalogram based at least in part on the wavelet transform of the light intensity signal;identifying, using the processor, first and second candidate bands in the scalogram;comparing, using the processor, at least one feature of the first and second bands;identifying, using the processor and based on the comparison, one of the first and second candidate bands as a band not of interest;discriminating, using the processor, the band not of interest; andcalculating, using a processor, a physiological parameter of the subject based at least in part on the scalogram.2. The method of claim 1 , wherein the physiological parameter is one of pulse rate and breathing rate.3. The method of claim 1 , wherein the at least one feature comprises a distribution of maximum turning points in time along a scale of the scalogram.4. The method of claim 1 , wherein comparing the at least one feature comprises:determining a modulation frequency of the first candidate band; andcomparing the modulation frequency ...

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Номер записи: 111
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046156A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component. 1100-. (canceled)101. A method for determining physiological information , comprising:obtaining a first pulse oximetry signal corresponding to a first wavelength of received light and a second pulse oximetry signal corresponding to a second wavelength of light from a subject at least in part using a signal acquisition unit;decomposing the first pulse oximetry signal at least in part using a first wavelet transform analysis using a signal processor to obtain a first set of values;decomposing the second pulse oximetry signal at least in part using a second wavelet transform analysis using a signal processor to obtain a second set of values;combining the first set of values with the second set of values to obtain a Lissajous plot;determining the physiological information based at least in part using the Lissajous plot.102. The method of claim 101 , wherein the first wavelength of received light corresponds to red light and the second wavelength of received light corresponds to infrared light.103. The method of claim 101 , wherein the first set ...

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Номер записи: 112
21-02-2013 дата публикации

Method of analyzing and processing signals

Номер: US20130046157A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland ULC

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.

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Номер записи: 113
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046160A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component. 1100-. (canceled)101. A method for determining oxygen saturation , comprising:obtaining a first pulse oximetry signal corresponding to a first wavelength of received light and a second pulse oximetry signal corresponding to a second wavelength of light from a subject at least in part using a signal acquisition unit;decomposing the first pulse oximetry signal at least in part using a first wavelet transform analysis using a signal processor to obtain first transform data;decomposing the second pulse oximetry signal at least in part using a second wavelet transform analysis using a signal processor to obtain second transform data;identifying a path in a band based at least in part on one or more of the first transform data and the second transform data;combining the first transform data with the second transform data to obtain a wavelet surface; anddetermining the oxygen saturation of the subject based at least in part on a projection of the path onto the wavelet surface.102. The method of claim 101 , wherein the first wavelength of received ...

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Номер записи: 114
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046161A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component. 1100-. (canceled)101. A method for determining oxygen saturation of a subject , comprising:obtaining a first pulse oximetry signal corresponding to a first wavelength of received light and a second pulse oximetry signal corresponding to a second wavelength of light from the subject at least in part using a signal acquisition unit;decomposing the first pulse oximetry signal at least in part using a first wavelet transform analysis using a signal processor to obtain first transform data;decomposing the second pulse oximetry signal at least in part using a second wavelet transform analysis using a signal processor to obtain second transform data;combining first transform data corresponding to a scale with second transform data corresponding to the scale to obtain a Lissajous plot;determining a ratio of a value of the first transform data and a value of the second; anddetermining the oxygen saturation of the subject based at least in part on the ratio and the Lissajous plot.102. The method of claim 101 , wherein the first wavelength of received ...

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Номер записи: 115
21-02-2013 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20130046188A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyze the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyzer component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyzer component. 1100-. (canceled)101. A method for determining physiological information , comprising:obtaining a biosignal from a subject at least in part using a signal acquisition unit;decomposing the biosignal at least in part using wavelet transform analysis to generate transform data;identifying a path in a band based at least in part on the transform data;identifying turning points in the path; anddetermining physiological information based on the turning points.102. The method of claim 101 , wherein the path comprises a ridge of the band or a path in a vicinity of a ridge of the band.103. The method of claim 102 , wherein the path comprises time-scale points.104. The method of claim 102 , wherein the path comprises time-amplitude points.105. The method of claim 101 , wherein the signal acquisition unit comprises a photodetector and wherein the biosignal is a photoplethysmogram signal.106. The method of claim 101 , wherein decomposing the biosignal at least in part using the wavelet transform analysis comprises performing a continuous wavelet ...

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Номер записи: 116
30-05-2013 дата публикации

Systems and methods for evaluating a physiological condition

Номер: US20130138357A1
Автор: Edward M. McKenna, James Nicholas Watson, James P. Ochs, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland ULC

A method and system are provided for evaluating in patient monitoring whether a signal is sensed optimally by receiving a signal, transforming the signal using a wavelet transform, generating a scalogram based at least in part on the transformed signal, identifying a pulse band in the scalogram, identifying a characteristic of the pulse band, determining, based on the characteristic of the pulse band, whether the signal is sensed optimally; and triggering an event. The characteristics of the pulse band and scalogram may be used to provide an indication of monitoring conditions.

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Номер записи: 117
01-08-2013 дата публикации

Systems And Methods For Estimating Values Of A Continuous Wavelet Transform

Номер: US20130197329A1
Автор: Braddon M. Van Slyke, James Nicholas Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland ULC

According to embodiments, techniques for estimating scalogram energy values in a wedge region of a scalogram are disclosed. A pulse oximetry system including a sensor or probe may be used to receive a photoplethysmograph (PPG) signal from a patient or subject. A scalogram, corresponding to the obtained PPG signal, may be determined. In an arrangement, energy values in the wedge region of the scalogram may be estimated by calculating a set of estimation locations in the wedge region and estimating scalogram energy values at each location. In an arrangement, scalogram energy values may be estimated based on an estimation scheme and by combining scalogram values in a vicinity region. In an arrangement, the vicinity region may include energy values in a resolved region of the scalogram and previously estimated energy values in the wedge region of the scalogram. In an arrangement, one or more signal parameters may be determined based on the resolved and estimated values of the scalogram.

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Номер записи: 118
05-09-2013 дата публикации

DETECTING A SIGNAL QUALITY DECREASE IN A MEASUREMENT SYSTEM

Номер: US20130229285A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

Techniques for detecting a signal quality decrease are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, energy values and energy structural characteristics in a pulse band, a mains hum band, and/or a noise band. Such characteristics may be analyzed to produce signal quality values and associated signal quality trends. One or more signal quality values and signal quality trends may be used to determine if a signal quality decrease has occurred or is likely to occur. 1. A method of determining signal quality information of a physiological signal , comprising:obtaining the physiological signal;generating a scalogram based at least in part on a wavelet transform of the physiological signal;determining one or more first characteristics of a pulse band of the scalogram;determining one or more second characteristics of a mains hum band or a noise band of the scalogram; anddetermining signal quality information of the physiological signal based at least in part on the one or more first characteristics and the one or more second characteristics.2. The method of claim 1 , wherein the one or more first characteristics comprise one or more of energy measures of the pulse band and energy structure of the pulse band.3. The method of claim 1 , wherein the one or more second characteristics comprise one or more of energy measures of the mains hum band claim 1 , energy measures of the noise band claim 1 , energy structure of the mains hum band claim 1 , and energy structure of the noise band.4. The method of claim 1 , further comprising combining the one or more first characteristics and the one or more second characteristics.5. The method of claim 4 , wherein ...

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Номер записи: 119
19-09-2013 дата публикации

SIGNAL PROCESSING TECHNIQUES FOR AIDING THE INTERPRETATION OF RESPIRATION SIGNALS

Номер: US20130245482A1
Автор: Addison Paul Stanley, McGonigle Scott, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

According to embodiments, a respiration signal may be processed to normalize respiratory feature values in order to improve and/or simplify the interpretation and subsequent analysis of the signal. Data indicative of a signal may be received at a sensor and may be used to generate a respiration signal. Signal peaks in the respiration signal may be identified and signal peak thresholds may be determined. The identified signal peaks may be adjusted based on the signal peak threshold values to normalize the respiration signal. 1. A method for processing a physiological signal , comprising:receiving, using a processor, the physiological signal;generating, using the processor, a wavelet transform based at least in part on the physiological signal, wherein the wavelet transform comprises phase information;identifying, using the processor, phase values corresponding to respiration based at least in part on the wavelet transform; andgenerating, using the processor, a substantially sinusoidal function based at least in part on the phase values, wherein the substantially sinusoidal function is indicative of respiration phase.2. The method of claim 1 , wherein the substantially sinusoidal function comprises normalized height values.3. The method of claim 1 , wherein identifying the phase values comprises identifying a respiration ridge based at least in part on the wavelet transform.4. The method of claim 3 , wherein the respiration ridge comprises local phase values as a function of time.5. The method of claim 1 , wherein generating the sinusoidal function comprises determining the cosine or sine of the phase values.6. The method of claim 1 , wherein generating the sinusoidal function comprises determining an inverse wavelet transform of the phase values as a function of time.7. The method of claim 1 , further comprising determining a respiration parameter based at least in part on the substantially sinusoidal function.8. The method of claim 1 , further comprising generating ...

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Номер записи: 120
24-10-2013 дата публикации

LOW PERFUSION SIGNAL PROCESSING SYSTEMS AND METHODS

Номер: US20130282296A1
Автор: Addison Paul Stanley, McKenna Edward M., Watson James Nicholas
Принадлежит:

In some embodiments, systems and methods for identifying a low perfusion condition are provided by transforming a signal using a wavelet transform to generate a scalogram. A pulse band and adjacent marker regions in the scalogram are identified. Characteristics of the marker regions are used to detect the existence of a lower perfusion condition. If such a condition is detected, an event may be triggered, such as an alert or notification. 1. A system comprising:a signal generator for generating a signal; generating a scalogram based at least in part on a wavelet transform of the signal;', 'identifying a pulse band in the scalogram;', 'identifying a marker region in the scalogram based at least in part on the position of the pulse band in the scalogram;', 'identifying a characteristic of the marker region; and', 'determining, based at least in part on the characteristic of the marker region, an indication of perfusion., 'a processor coupled to the signal generator, wherein the processor is configured to perform operations comprising2. The system of claim 1 , wherein the marker region is substantially parallel to the pulse band.3. The system of claim 1 , wherein the pulse band is between portions of the marker region.4. The system of claim 1 , wherein the marker region is adjacent to the pulse band.5. The system of claim 1 , wherein the marker region is spaced apart from the pulse band.6. The system of claim 1 , wherein the marker region is positioned above claim 1 , below claim 1 , or both above and below the pulse band.7. The system of claim 1 , wherein identifying the marker region comprises identifying the marker region based at least in part on user input claim 1 , a ridge of the scalogram claim 1 , or a modulus maximum of the scalogram.8. The system of claim 1 , wherein the indication of perfusion is determined based at least in part on the energy of the marker region.9. The system of claim 1 , wherein the signal comprises a photoplethysmograph signal from a ...

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Номер записи: 121
07-11-2013 дата публикации

SYSTEMS AND METHODS FOR NORMALIZING A PLETHYSMOGRAPH SIGNAL FOR IMPROVED FEATURE ANALYSIS

Номер: US20130296674A1
Автор: Addison Paul Stanley, Sethi Rakesh, Stoughton Robert, Watson James Nicholas
Принадлежит:

The present disclosure relates to systems and methods for analyzing and normalizing signals, such as PPG signals, for use in patent monitoring. The PPG signal may be detected using a continuous non-invasive blood pressure monitoring system and the normalized signals may be used to determine whether a recalibration of the system should be performed. 1. A method for normalizing a light intensity signal using a physiological monitoring system , comprising:receiving, using a processor, a light intensity signal from a subject at a first time;obtaining, using the processor, information indicating a change in a setting of the monitoring system;receiving, using a processor, a light intensity signal from a subject at a second time, wherein the first time occurs before the change in the setting of the monitoring system and the second time occurs after the change in the setting of the monitoring system;normalizing, using the processor, the light intensity signal at the second time in response to the change in the setting of the monitoring system;comparing, using the processor, the light intensity signal at the first time and the normalized light intensity signal at the second time; andtriggering, using the processor, an action, based at least in part on whether the light intensity signal at the first time and the normalized light intensity signal at the second time correspond.2. The method of claim 1 , wherein normalizing the light intensity signal at the second time comprises performing a calculation based at least in part on a change in amplitude claim 1 , area claim 1 , pulse period claim 1 , baseline claim 1 , or any combination thereof.3. The method of claim 1 , wherein obtaining information indicating a change in a setting of the monitoring system comprises receiving a user input.4. The method of claim 1 , wherein the action comprises calculating a physiological parameter of the subject.5. The method of claim 1 , wherein the action comprises generating an alarm signal.6. ...

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Номер записи: 122
09-01-2014 дата публикации

PROCESSING AND DETECTING BASELINE CHANGES IN SIGNALS

Номер: US20140012110A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

Systems and methods for detecting the occurrence of events from a signal are provided. A signal processing system may analyze baseline changes and changes in signal characteristics to detect events from a signal. The system may also detect events by analyzing energy parameters and artifacts in a scalogram of the signal. Further, the system may detect events by analyzing both the signal and its corresponding scalogram. 1. A method of detecting the occurrence of events from a signal , comprising:receiving the signal;transforming, using a processor, the signal to generate a transformed signal;generating, using the processor, a scalogram based at least in part on the transformed signal;detecting an artifact within the scalogram; andanalyzing, using the processor, the artifact within the scalogram to detect an occurrence of a physiological event.2. The method of claim 1 , further comprising:calculating a first energy parameter within a first region of the scalogram;calculating a second energy parameter within a second region of the scalogram subsequent to the artifact; andfurther analyzing the first and second energy parameters to detect the occurrence of the event.3. The method of claim 2 , wherein the first energy parameter is the average energy within the first region and the second energy parameter is the average energy within the second region.4. The method of claim 2 , wherein the signal is a photoplethysmograph and wherein the first and second regions comprise at least a portion of a pulse band.5. The method of claim 4 , wherein the first and second regions comprise a ridge of the pulse band.6. The method of claim 2 , wherein the artifact is a high energy broad-scale cone.7. The method of claim 1 , wherein the event comprises at least one of changes in blood pressure claim 1 , changes in body position claim 1 , vasodilation claim 1 , vasoconstriction claim 1 , sympathetic nervous response claim 1 , parasympathetic nervous response claim 1 , and sleep arousal.8. ...

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Номер записи: 123
06-03-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING A RESTING HEART RATE OF AN INDIVIDUAL

Номер: US20140066782A1
Автор: Addison Paul Stanley, Wang Rui, Watson James Nicholas
Принадлежит: Nellcor Puritan Bennett LLC

A system to determine a resting heart rate (HR) of an individual. The system may include a monitor that is configured to be operatively connected to a sensor that obtains physiological signals from an individual. The monitor is configured to receive the physiological signals from the sensor. The monitor may include a validation module that is configured to analyze the physiological signals to identify valid heart beats from the physiological signals. The monitor may also include a rate-determining module that is configured to determine an HR signal that is based on the valid heart beats. The HR signal includes a series of data points. The monitor may also include an analysis module that is configured to analyze the HR signal and identify baseline data points from the series of data points. The analysis module is configured to calculate the resting HR based on the baseline data points. 1. A system for determining a resting heart rate (HR) of an individual , the system comprising: a validation module configured to analyze the physiological signals to identify valid heart beats from the physiological signals;', 'a rate-determining module configured to determine an HR signal that is based on the valid heart beats, the HR signal including a series of data points; and', 'an analysis module configured to analyze the HR signal and identify baseline data points from the series of data points, the analysis module configured to calculate the resting HR based on the baseline data points., 'a monitor configured to be operatively connected to a sensor that obtains physiological signals from an individual, the monitor configured to receive the physiological signals from the sensor, the monitor including2. The system of claim 1 , wherein the analysis module is configured to obtain a first derivative of the HR signal and establish a derivative threshold value claim 1 , the first derivative including derivative data points claim 1 , wherein the analysis module identifies derivative ...

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Номер записи: 124
13-03-2014 дата публикации

SIMULTANEOUS MEASUREMENT OF PULSE AND REGIONAL BLOOD OXYGEN SATURATION

Номер: US20140073886A1
Автор: Addison Paul Stanley, Chen Bo, Li Youzhi, McKenna Edward M.
Принадлежит: COVIDIEN LP

Methods and systems are provided that allow for the simultaneous calculation of pulse and regional blood oxygen saturation. An oximeter system that includes a sensor with a plurality of emitters and detectors may be used to calculate a pulse and/or regional blood oxygen saturation. A plurality of light signals may be emitted from light emitters. A first light signal may be received at a first light detector and a second light signal may be received at a second light detector. A pulse and/or regional blood oxygen saturation value may be calculated based on the received first and/or second light signals. The pulse and regional blood oxygen saturation values may be calculated substantially simultaneously. The calculated pulse and regional blood oxygen saturation values as well as other blood oxygen saturation values may be displayed simultaneously in a preconfigured portion of a display. 1. A method for calculating blood oxygen saturations , the method comprising:receiving a first light signal corresponding to a first mean path length through tissue of a subject;receiving a second light signal corresponding to a second mean path length through tissue of the subject;calculating, using a processor, a pulse blood oxygen saturation based on at least one of the first and second light signals;calculating, using a processor, a regional blood oxygen saturation based on the first and second light signals; andcalculating, using a processor, a venous blood oxygen saturation based on the pulse blood oxygen saturation and the regional blood oxygen saturation.2. The method of claim 1 , wherein calculating the venous blood oxygen saturation is further based on a weighting.3. The method of claim 1 , wherein calculating the venous blood oxygen saturation comprises subtracting a weighted pulse blood oxygen saturation from the regional blood oxygen saturation.4. The method of claim 1 , further comprising simultaneously displaying the venous blood oxygen saturation claim 1 , the regional ...

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Номер записи: 125
03-04-2014 дата публикации

SYSTEMS AND METHODS FOR PROCESSING PHYSIOLOGICAL SIGNALS IN WAVELET SPACE

Номер: US20140094672A1
Автор: Addison Paul Stanley, Ochs James P., Watson James N.
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

Methods and systems are disclosed for analyzing multiple scale bands in the scalogram of a physiological signal in order to obtain information about a physiological process. An analysis may be performed to identify multiple scale bands that are likely to contain the information sought. Each scale band may be assessed to determine a band quality, and multiple bands may be combined based on the band quality. Information about a physiological process may determined based on the combined band. In an embodiment, analyzing multiple scale bands in a scalogram arising from a wavelet transformation of a photoplethysmograph signal may yield clinically relevant information about, among other things, the blood oxygen saturation of a patient. 1. A method for processing a physiological signal of a subject , comprising:receiving, from a sensor, the physiological signal;determining, using a processor, a pulse rate of the subject based at least in part on the physiological signal;transforming, using the processor, the physiological signal into a transformed signal based at least in part on a wavelet transform;determining, using the processor, a quality associated with each of a plurality of scales of the transformed signal, wherein each of the plurality of scales is based at least in part on the pulse rate;combining, using the processor, the plurality of scales of the transformed signal to generate combined scale data based at least in part on the associated qualities; anddetermining, using the processor, physiological information of the subject based at least in part on the combined scale data.2. The method of claim 1 , wherein the plurality of scales corresponds to scales associated with the pulse rate and multiples of the pulse rate.3. The method of claim 1 , wherein the plurality of scales comprises a first scale corresponding to the pulse rate claim 1 , a second scale corresponding to two times the pulse claim 1 , and a third scale corresponding to three times the pulse rate.4. ...

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Номер записи: 126
04-01-2018 дата публикации

SYSTEM AND METHOD FOR GENERATING AN ADJUSTED FLUID RESPONSIVENESS METRIC

Номер: US20180000360A1
Автор: Addison Paul Stanley, McGonigle Scott, Wang Rui, Watson James N.
Принадлежит:

The present invention relates to physiological signal processing, and in particular to methods and systems for processing physiological signals to predict a fluid responsiveness of a patient. A medical monitor for monitoring a patient includes an input receiving a photoplethysmograph (PPG) signal representing light absorption by a patient's tissue. The monitor also includes a perfusion status indicator indicating a perfusion status of the PPG signal, and a fluid responsiveness predictor (FRP) calculator programmed to calculate an FRP value based on a respiratory variation of the PPG signal. The FRP calculator applies a correction factor based on the perfusion status indicator. 1. A medical monitor for monitoring a subject , comprising: receive sensor type identification data of a photoplethysmograph (PPG) sensor;', "receive a PPG signal representing light absorption by a subject's tissue from the PPG sensor;"], 'a sensor port configured to determine sensor type of the PPG sensor based on the received sensor type identification data;', 'choose at least one fluid responsiveness predictor (FRP) calculation setting based on the determined sensor type; and', 'calculate an FRP value based on a respiratory variation of the PPG signal, and based on the at least one chosen FRP calculation setting; and, 'a processor configured toa display configured to display the FRP value.2. The monitor of claim 1 , wherein the sensor type is at least one of: a forehead sensor claim 1 , a finger sensor claim 1 , a toe sensor claim 1 , an ear sensor claim 1 , a nose sensor claim 1 , a neonate sensor claim 1 , a pediatric sensor claim 1 , and an adult sensor.3. The monitor of claim 1 , wherein the sensor port is configured to receive the sensor type identification data from the PPG sensor.4. The monitor of claim 1 , wherein the sensor port is configured to receive the sensor type identification data from a cable that communicatively connects the PPG sensor and the medical monitor.5. The ...

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Номер записи: 127
21-01-2016 дата публикации

COMBINED PHYSIOLOGICAL SENSOR SYSTEMS AND METHODS

Номер: US20160015281A1
Автор: Addison Paul Stanley, Chen Bo, Li Youzhi, McKenna Edward M.
Принадлежит:

A combined physiological sensor and methods for detecting one or more physiological characteristics of a subject are provided. The combined sensor (e.g., a forehead sensor) may be used to detect and/or calculate at least one of a pulse blood oxygen saturation level, a regional blood oxygen saturation level, a respiration rate, blood pressure, an electrical physiological signal (EPS), a pulse transit time (PTT), body temperature associated with the subject, a depth of consciousness (DOC) measurement, any other suitable physiological parameter, and any suitable combination thereof. The combined sensor may include a variety of individual sensors, such as electrodes, optical detectors, optical emitters, temperature sensors, and/or other suitable sensors. The sensors may be advantageously positioned in accordance with a number of different geometries. The combined sensor may also be coupled to a monitoring device, which may receive and/or process one or more output signals from the individual sensors to display information about the medical condition of the subject. In addition, several techniques may be employed to prevent or limit interference between the individual sensors and their associated input and/or output signals. 1. A multi-sensor subject monitoring system comprising:a plurality of sensors comprising at least two of: a photoplethysmographic (PPG) sensor, an electrical physiological signal (EPS) sensor, and a temperature sensor; and activate and deactivate a first sensor of the plurality of sensors in accordance with a timing scheme; and', 'activate and deactivate a second sensor of the plurality of sensors in accordance with the timing scheme,', 'wherein timing of activation and deactivation of the first sensor and timing of activation and deactivation of the second sensor is designed to reduce interference between the plurality of sensors., 'sensor control circuitry configured to2. The multi-sensor monitoring system of claim 1 , wherein the sensor control ...

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Номер записи: 128
23-01-2020 дата публикации

SYSTEM AND METHOD FOR DETERMINING STROKE VOLUME OF A PATIENT

Номер: US20200022590A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит:

A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time. 120-. (canceled)21. A photoplethysmogram (PPG) system comprising: one or more light sources configured to emit light into a tissue of a patient; and', 'one or more detectors configured to detect an amount of the light from the tissue, wherein the detected amount of the light corresponds to a physiological characteristic of the patient; and, 'a PPG sensor configured to generate a PPG signal including a primary peak separated from a trailing peak by a dicrotic notch, the PPG sensor comprising receive the PPG signal from the PPG sensor,', 'determine a slope transit time of an upslope of the primary peak of the PPG signal, and', 'determine a stroke volume of the patient based on the determined slope transit time., 'processing circuitry configured to22. The PPG system of claim 21 , wherein the processing circuitry is configured to determine the slope transit time of the upslope of the primary peak of the PPG signal by at least:determining a contour of the PPG signal along the upslope of the primary peak, anddetermining the slope transit time based on an amplitude of the contour.23. The PPG system of claim 21 , wherein the processing circuitry is configured to determine the slope transit time by at least determining a gradient of the upslope for a given amplitude of the PPG signal.24. The PPG system of claim 21 , wherein the processing circuitry is configured to determine the slope ...

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Номер записи: 129
04-02-2016 дата публикации

SAMPLING INTERFACES

Номер: US20160029922A1
Автор: Addison Paul Stanley, Bar-Lev Avner, Colman Joshua Lewis, Mandelbaum Moshe, Sasson Alon
Принадлежит:

A tubeless patient interface including a grasping member configured to grasp a patient's nose or tooth; and a miniature COsensor attached to the grasping member and configured to measure the concentration of COfrom a patient's breath flow. 1. A tubeless patient interface comprising:a grasping member configured to grasp a patient's nose or tooth; and{'sub': 2', '2, "a miniature COsensor attached to said grasping member and configured to measure the concentration of COfrom a patient's breath flow."}2. The interface of claim 1 , configured to facilitate non-diverted breath sampling.3. The interface of claim 1 , further configured to wirelessly provide the measured COconcentration to a remote control logic.4. The interface of claim 1 , wherein said miniature COsensor is a nano-sized optical sensor.5. The interface of claim 1 , wherein said miniature COsensor is a chemical sensor.6. The interface of claim 1 , wherein said grasping member comprises a first and a second arm claim 1 , and an elastic member configured to connect said first and second arms.7. The interface of claim 6 , wherein said interface is configured to be worn on said patient's nose.8. The interface of claim 6 , wherein said patient interface comprises at least two miniature COsensors; and wherein each of said first and second arms comprises at least one miniature COsensor on a proximal end thereof.9. The interface of claim 8 , wherein said proximal ends of said first and second arms are configured to reach underneath or within a patient's nostrils.10. The interface of claim 6 , wherein stretching of said elastic member is indicative of said interface being worn by said patient.11. The interface of claim 10 , wherein said interface is further configured to on/off patient detection based on said stretching of said elastic member.12. The interface of claim 6 , wherein said elastic member comprises an SpOprobe.13. The interface of claim 1 , wherein said grasping member comprises a circlip configured to ...

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Номер записи: 130
18-02-2016 дата публикации

SLEEP APNEA

Номер: US20160045154A1
Автор: Addison Paul Stanley, Colman Joshua Lewis, GOLBERG Mark, Goulitski Konstantin
Принадлежит:

Provided are systems and method for prediction and mitigation of apnea of a subject, based on measurements of various physiological parameters of the subject. 1. A system for predicting and mitigating sleep apnea event in a subject , the system comprising:one or more medical monitoring devices configured to measure one or more physiological parameters of the subject;a processing unit configured to integrate the one or more physiological parameters of the subject, to predict an apnea event, based on the measured parameters; anda stimulating unit configured to provide a stimulation to the subject, prior to the apnea event, thereby mitigating said apnea event.2. The system of claim 1 , wherein said processing unit is further configured to determine a patient specific pre-apneic pattern in the one or more physiological parameters by applying a learning algorithm to the measured one or more physiological parameters.3. The system of claim 2 , wherein predicting the apnea event comprises detecting the determined patient specific pre-apneic pattern in the one or more measured physiological parameters.4. The system of claim 1 , wherein the medical monitoring device comprises a capnograph or a pulse oximeter.5. The system of claim 4 , wherein the medical monitoring device further comprises: capnograph claim 4 , pulse oximeter claim 4 , breath flow sensor claim 4 , Electrocardiogram (ECG) claim 4 , Brain activity monitoring device claim 4 , or combinations thereof.6. The system of claim 1 , wherein the physiological parameters of the subject comprises: breath related parameters claim 1 , heart related parameters claim 1 , blood related parameters claim 1 , brain electrical activity claim 1 , parameters derived therefrom claim 1 , or combinations thereof.7. The system of claim 6 , wherein the breath related parameters comprises airflow claim 6 , respiration rate claim 6 , respiration effort claim 6 , breath flow claim 6 , expired CO claim 6 , or combinations thereof.8. The ...

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Номер записи: 131
17-03-2016 дата публикации

METHODS AND SYSTEMS FOR DETERMINING FLUID RESPONSIVENESS

Номер: US20160073965A1
Автор: Addison Paul Stanley, Doyle Peter, McGonigle Scott, Wang Rui, Watson James Nicholas
Принадлежит:

Methods and systems are provided for determining fluid responsiveness based on a physiological signal. The system may determine fluid responsiveness based on the physiological signal and receive or determine respiration information of the subject. The system may correct the fluid responsiveness based on the respiration information. In some embodiments, the system may determine a correction factor to correct the fluid responsiveness values based on a relationship between fluid responsiveness and the respiration information. In some embodiments, the system may correct the measured fluid responsiveness based on an error between the fluid responsiveness measure and another measure such as pulse pressure variation, where there is a relationship between the error and the respiration information. 1. A physiological monitor for monitoring fluid responsiveness of a subject , comprising:an input configured to receive a physiological signal; and receive the physiological signal;', 'determine a parameter indicative of fluid responsiveness based on the physiological signal;', 'receive respiration information of the subject;', 'determine a correction factor of the parameter indicative of fluid responsiveness based on the respiration information; and', 'determine a corrected parameter indicative of fluid responsiveness based on the parameter indicative of fluid responsiveness and the correction factor., 'a fluid responsiveness parameter determination module configured to2. The monitor of claim 1 , wherein the respiration information comprises at least one of respiration rate claim 1 , respiration effort claim 1 , tidal volume claim 1 , and airway pressure of the subject.3. The monitor of claim 1 , wherein the fluid responsiveness parameter determination module is further configured to:compare the respiration information to a standard value; anddetermine the correction factor based on the comparison.4. The monitor of claim 3 , wherein the respiration information comprises ...

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Номер записи: 132
05-03-2020 дата публикации

SYSTEM AND METHOD FOR PROVIDING BLOOD PRESSURE SAFE ZONE INDICATION DURING AUTOREGULATION MONITORING

Номер: US20200069195A1
Автор: Addison Paul Stanley, Montgomery Dean, Watson James N.
Принадлежит:

A method for monitoring autoregulation includes, using a processor, using a processor to execute one or more routines on a memory. The one or more routines include receiving one or more physiological signals from a patient, determining a correlation-based measure indicative of the patient's autoregulation based on the one or more physiological signals, and generating an autoregulation profile of the patient based on autoregulation index values of the correlation-based measure. The autoregulation profile includes the autoregulation index values sorted into bins corresponding to different blood pressure ranges. The one or more routines also include designating a blood pressure range encompassing one or more of the bins as a blood pressure safe zone indicative of intact regulation and providing a signal to a display to display the autoregulation profile and a first indicator of the blood pressure safe zone. 1. A monitor for monitoring autoregulation , the monitor comprising:a display;a memory encoding one or more processor-executable instructions; and receive one or more physiological signals from a patient;', 'determine a correlation-based measure indicative of an autoregulation of the patient based on the one or more physiological signals;', 'generate an autoregulation profile of the patient based on autoregulation index values of the correlation-based measure, wherein the autoregulation profile comprises the autoregulation index values sorted into bins corresponding to different blood pressure ranges;', 'designate a blood pressure range encompassing one or more of the bins as a blood pressure safe zone indicative of intact autoregulation; and', 'provide a first signal to the display to display the autoregulation profile and a first indicator of the blood pressure safe zone., 'one or more processors configured to access and execute the one or more instructions encoded by the memory, wherein the instructions, when executed, cause the one or more processors to2. The ...

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Номер записи: 133
26-06-2014 дата публикации

METHODS AND SYSTEMS FOR DETECTING A SENSOR-OFF CONDITION USING INTERFERENCE COMPONENTS

Номер: US20140175261A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A physiological monitoring system may use photonic signals at one or more wavelengths to determine physiological parameters. During monitoring, a physiological sensor may become improperly positioned, which may affect the physiological attenuation of the photonic signals, and accordingly a detected light signal. The detected light signal may include an ambient light component and a signal component corresponding to the one or more wavelengths of light. One or both components may exhibit an interference signal component caused by environmental light. The physiological monitoring system may analyze the interference signal components to determine a sensor-off condition. 1. A method for determining whether a physiological sensor is properly positioned on a subject , the method comprising:receiving a detected light signal, wherein the detected light signal comprises an ambient light signal component and a signal component corresponding to a wavelength of light emitted by the physiological sensor;processing the detected light signal, using processing equipment, to generate a first signal corresponding to at least the ambient light signal component;identifying, using the processing equipment, at least one first interference signal component based at least in part on the first signal, wherein the interference signal component corresponds to non-physiological information;analyzing, using the processing equipment, the interference signal component; anddetermining, using the processing equipment, whether the physiological sensor is properly positioned based at least in part on the analysis.2. The method of further comprising:processing the detected light signal, using the processing equipment, to generate a second signal corresponding to the ambient light signal component and the signal component;identifying, using the processing equipment, at least one second interference signal component based at least in part on the second signal; andanalyzing, using the processing ...

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Номер записи: 134
26-06-2014 дата публикации

METHODS AND SYSTEMS FOR DETERMINING A PROBE-OFF CONDITION IN A MEDICAL DEVICE

Номер: US20140176944A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A physiological monitoring system may determine a probe-off condition. A physiological sensor may be used to emit one or more wavelengths of light. A received light signal may be processed to obtain a light signal corresponding to the emitted light and an ambient signal. The signals may be analyzed to identify similar behavior. The system may determine whether the physiological sensor is properly positioned based on the analysis. 1. A method for determining whether a physiological sensor is properly positioned on a subject , the method comprising:receiving a light signal using the physiological sensor;processing, using processing equipment, the light signal to obtain a first signal corresponding to ambient light;processing, using the processing equipment, the light signal to obtain a second signal corresponding to an emitted photonic signal and ambient light;analyzing, using the processing equipment, the first signal and the second signal to identify similar behavior; anddetermining, using the processing equipment, that the physiological sensor is not properly positioned based on the analysis.2. The method of claim 1 , wherein the physiological sensor comprises a pulse oximeter.3. The method of claim 1 , wherein receiving the light signal comprises receiving light from a first light emitting diode configured to emit a first wavelength of light and from a second light emitting diode configured to emit a second wavelength of light.4. The method of claim 1 , wherein the light signal is detected by a photoelectric detector.5. The method of claim 1 , wherein analyzing the first signal and the second signal to identify similar behavior comprises determining whether a difference in amplitudes of the first and second signals is substantially constant.6. The method of claim 1 , wherein analyzing the first signal and the second signal to identify similar behavior comprises determining whether a difference in slopes of the first and second signals is substantially constant.7. ...

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Номер записи: 135
16-04-2015 дата публикации

Methods and systems for determining a probe-off condition in a medical device

Номер: US20150103360A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: COVIDIEN LP

A physiological monitoring system may determine a probe-off condition. A physiological sensor may be used to emit one or more wavelengths of light. A received light signal may be processed to obtain a light signal corresponding to the emitted light and an ambient signal. The signals may be analyzed to identify similar behavior. The system may determine whether the physiological sensor is properly positioned based on the analysis.

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Номер записи: 136
26-06-2014 дата публикации

METHODS AND SYSTEMS FOR DETERMINING SIGNAL QUALITY OF A PHYSIOLOGICAL SIGNAL

Номер: US20140180043A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A physiological monitoring system may use photonic signals at one or more wavelengths to determine physiological parameters. The system may monitor a photoplethysmograph (PPG) signal, which may include a periodic component, and an aperiodic component. An attractor may be generated based on a first segment of the PPG signal and a second segment of the PPG signal shifted in time relative to the first segment by a time delay. The system may analyze points of the attractor that correspond to a curve, analyze the distribution of the attractor about a curve, or both, to determine a signal quality metric indicative of cycle to cycle variation in the PPG signal. 1. A method for determining signal quality of a physiological signal , the method comprising:receiving a photoplethysmograph signal;specifying, using processing equipment, a first segment of the photoplethysmograph signal, wherein the first segment comprises a first plurality of sample values;specifying, using the processing equipment, a second segment of the photoplethysmograph signal based on a time delay relative to the first segment, wherein the second segment comprises a second plurality of sample values;associating, using the processing equipment, each sample value of the first segment with a corresponding sample value of the second segment to generate a plurality of associated value pairs;identifying, using the processing equipment, a subset of associated value pairs of the plurality of associated value pairs, wherein when the plurality of associated value pairs are considered in two-dimensional space, the subset of associated value pairs substantially correspond to a curve; anddetermining, using the processing equipment, a signal quality metric based on the subset of associated value pairs.2. The method of claim 1 , wherein the curve comprises a line.3. The method of claim 1 , wherein identifying the subset of associated value pairs of the plurality of associated value pairs comprises:identifying at least ...

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Номер записи: 137
26-06-2014 дата публикации

METHODS AND SYSTEMS FOR DETERMINING SIGNAL QUALITY OF A PHYSIOLOGICAL SIGNAL

Номер: US20140180044A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A physiological monitoring system may use photonic signals at one or more wavelengths to determine physiological parameters. The system may receive a photoplethysmograph signal, and generated a difference signal based on the photoplethysmograph signal. The system may specify a segment of the photoplethysmograph signal and a segment of the difference signal. The system may associate each value of the segment of the photoplethysmograph signal to a corresponding value of the segment of the difference signal to generate associated value pairs. The system may compare the associated value pairs to a reference characteristic, and determine a signal quality metric based on the comparison. 1. A method for determining signal quality of a physiological signal , the method comprising:receiving a photoplethysmograph signal;generating, using processing equipment, a difference signal based on the photoplethysmograph signal;specifying, using the processing equipment, a segment of the photoplethysmograph signal comprising a first plurality of values;specifying, using the processing equipment, a segment of the difference signal comprising a second plurality of values;associating, using the processing equipment, each value of the first plurality of values with a corresponding value of the second plurality of values to generate a plurality of associated value pairs;comparing, using the processing equipment, the plurality of associated value pairs to a reference characteristic; anddetermining, using the processing equipment, a signal quality metric based on the comparison.2. The method of claim 1 , wherein the reference characteristic comprises a set of reference value pairs obeying a linear relationship claim 1 , and wherein comparing the plurality of associated value pairs to the reference characteristic comprises determining a set of resultant values that are nearest to the reference value pairs.3. The method of claim 2 , wherein determining the signal quality metric comprises ...

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Номер записи: 138
21-04-2016 дата публикации

SYSTEM AND METHOD FOR DETERMINING STROKE VOLUME OF A PATIENT

Номер: US20160106322A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит:

A PPG system for determining a stroke volume of a patient includes a PPG sensor configured to be secured to an anatomical portion of the patient. The PPG sensor is configured to sense a physiological characteristic of the patient. The PPG system may include a monitor operatively connected to the PPG sensor. The monitor receives a PPG signal from the PPG sensor. The monitor includes a pulse trending module determining a slope transit time of an upslope of a primary peak of the PPG signal. The pulse trending module determines a stroke volume of the patient as a function of the slope transit time. 120.-. (canceled)21. A method , comprising:receiving a photoplethysmogram (PPG) signal from a PPG sensor via a monitor comprising a processor, wherein the PPG sensor is configured to be secured to a skin surface of a patient, and wherein the PPG sensor comprises one or more light sources configured to emit light into a tissue and one or more detectors configured to detect an amount of the light from the tissue, and wherein the PPG signal comprises a primary peak separated from a trailing peak by a dichrotic notch;analyzing the PPG signal via the processor to determine an inverse gradient of an upslope of the primary peak of the PPG signal; andcalculating a stroke volume via the processor based on the inverse gradient of the upslope of the primary peak of the PPG signal.22. The method of claim 21 , wherein the PPG signal comprises a PPG waveform claim 21 , and wherein analyzing the PPG signal comprises analyzing a contour of the PPG waveform along the upslope of the primary peak to identify the inverse gradient.23. The method of claim 21 , wherein analyzing the PPG signal comprises correlating the inverse gradient of the upslope of the primary peak of the PPG signal to a slope transit time of an initial pressure wave.24. The method of claim 23 , wherein correlating the inverse gradient of the upslope to a slope transit time comprises calculating the inverse gradient of the PPG ...

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Номер записи: 139
20-04-2017 дата публикации

System and method for providing blood pressure safe zone indication during autoregulation monitoring

Номер: US20170105631A1
Автор: Dean Montgomery, James N. Watson, Paul Stanley Addison
Принадлежит: COVIDIEN LP

A method for monitoring autoregulation includes, using a processor, using a processor to execute one or more routines on a memory. The one or more routines include receiving one or more physiological signals from a patient, determining a correlation-based measure indicative of the patient's autoregulation based on the one or more physiological signals, and generating an autoregulation profile of the patient based on autoregulation index values of the correlation-based measure. The autoregulation profile includes the autoregulation index values sorted into bins corresponding to different blood pressure ranges. The one or more routines also include designating a blood pressure range encompassing one or more of the bins as a blood pressure safe zone indicative of intact regulation and providing a signal to a display to display the autoregulation profile and a first indicator of the blood pressure safe zone.

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Номер записи: 140
02-05-2019 дата публикации

MEASURING RESPIRATORY PARAMETERS FROM AN ECG DEVICE

Номер: US20190125214A1
Автор: Addison Paul Stanley, BARTLETT DANIEL WAYNE, Watson James N.
Принадлежит:

Methods, systems, and devices for measuring respiratory parameters from an ECG device are described. The method may include receiving an electrocardiogram (ECG) signal associated with a patient. The method may further include detecting a change in modulation of the ECG signal between a first portion of the ECG signal and a second portion of the ECG signal. The method may further include determining a change in respiratory effort of the patient based at least in part on the change in modulation. 1. A method of patient monitoring , comprising:receiving an electrocardiogram (ECG) signal associated with a patient;detecting a change in modulation of the ECG signal between a first portion of the ECG signal and a second portion of the ECG signal; anddetermining a change in respiratory effort of the patient based at least in part on the change in modulation.2. The method of claim 1 , wherein detecting the change in modulation comprises comparing an R-wave amplitude modulation of a first plurality of R-waves from the first portion of the ECG signal with an R-wave amplitude modulation of a second plurality of R-waves from the second portion of the ECG signal.3. The method of claim 2 , wherein the R-wave amplitude modulation of the second plurality of R-waves is greater than the R-wave amplitude modulation of the first plurality of R-waves.4. The method of claim 1 , wherein detecting the change in modulation comprises comparing a frequency modulation of a first plurality of R-waves from the first portion of the ECG signal with a frequency modulation of a second plurality of R-waves from the second portion of the ECG signal.5. The method of claim 4 , wherein:a difference between a maximum R-wave frequency and a minimum R-wave frequency in the second portion of the ECG signal is greater than a difference between a maximum R-wave frequency and a minimum R-wave frequency in the first portion of the ECG signal.6. The method of claim 1 , wherein detecting the change in modulation ...

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Номер записи: 141
22-09-2022 дата публикации

COMBINED PHYSIOLOGICAL SENSOR SYSTEMS AND METHODS

Номер: US20220296107A1
Автор: Addison Paul Stanley, Chen Bo, Li Youzhi, McKenna Edward M.
Принадлежит:

A combined physiological sensor and methods for detecting one or more physiological characteristics of a subject are provided. The combined sensor (e.g., a forehead sensor) may be used to detect and/or calculate at least one of a pulse blood oxygen saturation level, a regional blood oxygen saturation level, a respiration rate, blood pressure, an electrical physiological signal (EPS), a pulse transit time (PTT), body temperature associated with the subject, a depth of consciousness (DOC) measurement, any other suitable physiological parameter, and any suitable combination thereof. The combined sensor may include a variety of individual sensors, such as electrodes, optical detectors, optical emitters, temperature sensors, and/or other suitable sensors. The sensors may be advantageously positioned in accordance with a number of different geometries. The combined sensor may also be coupled to a monitoring device, which may receive and/or process one or more output signals from the individual sensors to display information about the medical condition of the subject. In addition, several techniques may be employed to prevent or limit interference between the individual sensors and their associated input and/or output signals. 118-. (canceled)19. A method , comprising: one or more electrical physiological signal (EPS) sensors disposed on the sensor structure and configured to sense an electrical physiological signal of the subject;', 'a first detector spaced a first distance apart from the light source on the sensor structure, wherein the first detector is configured to detect the emitted light; and', 'a second detector spaced a second distance apart from the light source on the sensor structure along an imaginary axis connecting the light source and the first detector, wherein the second detector is configured to detect the emitted light;, 'driving, via a monitoring device, a light source disposed on a sensor structure of a combined physiological sensor, wherein the light ...

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Номер записи: 142
28-08-2014 дата публикации

METHODS AND SYSTEMS FOR DETERMINING A PROBE-OFF CONDITION IN A MEDICAL DEVICE

Номер: US20140243633A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A physiological monitoring system may determine a probe-off condition. A physiological sensor may receive a light signal including one or more wavelengths of light. The received light signal may be processed to obtain a light signal corresponding to an ambient light signal and a light signal corresponding to an emitted light signal and the ambient light signal. The signals may be analyzed to identify an inverse effect. The system may determine whether the physiological sensor is properly positioned based on the identification of an inverse effect. 1. A method for determining whether a physiological sensor is properly positioned on a subject , the method comprising:receiving a detected light signal using the physiological sensor;processing, using processing equipment, the light signal to obtain a first signal corresponding to ambient light;processing, using the processing equipment, the light signal to obtain a second signal corresponding to the photonic signal and ambient light;identifying, using the processing equipment, an inverse effect based on the first signal and the second signal; anddetermining, using the processing equipment, that the physiological sensor is not properly positioned based on the identification of an inverse effect.2. The method of claim 1 , wherein identifying the inverse effect comprises:determining a difference signal by subtracting the first signal from the second signal; andidentifying opposite behavior in the first signal and the difference signal, wherein the opposite behavior comprises an inverse effect.3. The method of claim 1 , wherein identifying the inverse effect comprises identifying opposite behavior in the first signal and second signal claim 1 , wherein the opposite behavior comprises an inverse effect.4. The method of claim 1 , wherein determining the inverse effect comprises:determining a difference signal by subtracting the first signal from the second signal;determining a weight based on the first signal and the ...

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Номер записи: 143
14-06-2018 дата публикации

COMBINED PHYSIOLOGICAL SENSOR SYSTEMS AND METHODS

Номер: US20180160915A1
Автор: Addison Paul Stanley, Chen Bo, Li Youzhi, McKenna Edward M.
Принадлежит:

A combined physiological sensor and methods for detecting one or more physiological characteristics of a subject are provided. The combined sensor (e.g., a forehead sensor) may be used to detect and/or calculate at least one of a pulse blood oxygen saturation level, a regional blood oxygen saturation level, a respiration rate, blood pressure, an electrical physiological signal (EPS), a pulse transit time (PTT), body temperature associated with the subject, a depth of consciousness (DOC) measurement, any other suitable physiological parameter, and any suitable combination thereof. The combined sensor may include a variety of individual sensors, such as electrodes, optical detectors, optical emitters, temperature sensors, and/or other suitable sensors. The sensors may be advantageously positioned in accordance with a number of different geometries. The combined sensor may also be coupled to a monitoring device, which may receive and/or process one or more output signals from the individual sensors to display information about the medical condition of the subject. In addition, several techniques may be employed to prevent or limit interference between the individual sensors and their associated input and/or output signals. 1. A system , comprising:a light source disposed on a sensor structure, wherein the light source is configured to emit light into a tissue of a subject;a first detector spaced a first distance apart from the light source on the sensor structure, wherein the first detector is configured to detect the emitted light;a second detector spaced a second distance apart from the light source on the sensor structure along an imaginary axis connecting the light source and the first detector, wherein the second detector is configured to detect the emitted light; andan encoder comprising a memory, wherein the memory is configured to store information comprising at least one or more wavelengths of the light the light source is configured to emit and one or more ...

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Номер записи: 144
11-09-2014 дата публикации

SYSTEMS AND METHODS FOR DETERMINING OXYGEN SATURATION

Номер: US20140257061A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: NELLCOR PURITAN BENNETT IRELAND

According to embodiments, techniques for using continuous wavelet transforms and spectral transforms to determine oxygen saturation from photoplethysmographic (PPG) signals are disclosed. According to embodiments, a first and a second PPG signals may be received. A spectral transform of the first and the second PPG signals may be performed to produce a first and a second spectral transformed signals. A frequency region associated with a pulse rate of the PPG signals may be identified from the first and the second spectral transformed signals. According to embodiments, a continuous wavelet transform of the first and the second PPG signals may be performed at a scale corresponding to the identified frequency region to produce a first and a second wavelet transformed signals. The oxygen saturation may be determined based at least in part upon the wavelet transformed signals.

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Номер записи: 145
09-07-2015 дата публикации

APNEA ANALYSIS SYSTEM AND METHOD

Номер: US20150190088A1
Автор: Addison Paul Stanley, Chen Bo, Johnson Corinne H., Kadlec Ron J., Kolnsberg Mark E., Maharajh Niranjan, Mestek Michael L., Ochs James P., Watson James N.
Принадлежит:

An apnea analysis system may include a photoplethysmographic (PPG) sub-system, a breath detection sub-system, and an apnea analysis module. An apnea analysis system includes a photoplethysmographic (PPG) sub-system, a breath detection sub-system, and an apnea analysis module. The PPG sub-system is configured to be operatively connected to an individual and output a PPG signal from the individual. The breath detection sub-system is configured to be operatively connected to the individual and output a breath signal from the individual. The apnea analysis module is in communication with the PPG sub-system and the breath detection sub-system. The apnea analysis module analyzes the breath signal and a respiratory component of the PPG signal and, based on the analysis, identifies a presence of apnea, differentiates between obstructive apnea and central apnea, and provides an indication of the identified apnea. 1. An apnea analysis system comprising:a photoplethysmographic (PPG) sub-system configured to be operatively connected to an individual and output a PPG signal from the individual;a breath detection sub-system configured to be operatively connected to the individual and output a breath signal from the individual; andan apnea analysis module in communication with the PPG sub-system and the breath detection sub-system, wherein the apnea analysis module analyzes the breath signal and a respiratory component of the PPG signal and, based on the analysis, identifies a presence of apnea, differentiates between obstructive apnea and central apnea, and provides an indication of the identified apnea.2. The apnea analysis system of claim 1 , wherein the respiratory component of the PPG comprises a baseline modulation claim 1 , an amplitude modulation claim 1 , or a frequency modulation of the PPG.3. The apnea analysis system of claim 1 , wherein the apnea analysis module identifies a presence of normal breathing when the breath signal and the respiratory component of the PPG ...

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Номер записи: 146
18-09-2014 дата публикации

SYSTEMS AND METHODS FOR DETERMINING RESPIRATION INFORMATION BASED ON PRINCIPAL COMPONENT ANALYSIS

Номер: US20140275877A1
Автор: Addison Paul Stanley, Dripps Jimmy, McGonigle Scott, Ochs James, Watson James
Принадлежит:

A patient monitoring system may receive a physiological signal such as a photoplethysmograph (PPG) signal. A plurality of respiration morphology signals may be determined from the PPG signal. Principal component analysis may be performed on the respiration morphology signals, resulting in one or more principal components. Respiration information such as respiration rate may be determined at least in part from a principal component that corresponds to a respiration source signal. 1. A method comprising:receiving a photoplethysmograph (PPG) signal;processing, with processing equipment, the PPG signal to generate a plurality of respiration morphology signals;performing, with the processing equipment, principal component analysis on the plurality of respiration morphology signals to generate one or more principal components;identifying, with the processing equipment, a principal component of the one or more principal components that corresponds to a respiration source signal; anddetermining, with the processing equipment, respiration information based at least in part on the identified principal component.2. The method of claim 1 , wherein the plurality of respiration morphology signals comprise one or more of a down signal claim 1 , a difference in the second derivative signal claim 1 , and a kurtosis signal.3. The method of claim 1 , wherein processing the PPG signal to generate a plurality of respiration morphology signals comprises:generating a plurality of candidate respiration morphology signals;calculating one or more confidence metrics associated with the candidate respiration morphology signals; andselecting the plurality of respiration morphology signals from the candidate respiration morphology signals based on the confidence metrics.4. The method of claim 1 , wherein processing the PPG signal to generate a plurality of respiration morphology signals comprises:generating a plurality of candidate respiration morphology signals;determining a predicted ...

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Номер записи: 147
18-09-2014 дата публикации

Systems and methods for determining respiration information based on independent component analysis

Номер: US20140275879A1
Автор: James Nicholas Watson, James Ochs, Jimmy Dripps, Paul Stanley Addison
Принадлежит: COVIDIEN LP

A patient monitoring system may receive a physiological signal such as a photoplethysmograph (PPG) signal. A plurality of respiration morphology signals may be determined from the PPG signal. Independent component analysis may be performed on the respiration morphology signals, resulting in a plurality of independent components. An independent component corresponding to a respiration source signal may be selected from the plurality of independent components. Respiration information such as respiration rate may be determined based at least in part on the selected independent component.

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Номер записи: 148
18-09-2014 дата публикации

Methods and Systems for Determining a Probe-Off Condition in a Medical Device

Номер: US20140275882A1
Автор: James Nicholas Watson, Paul Mannheimer, Paul Stanley Addison
Принадлежит: COVIDIEN LP

A physiological monitoring system may use one or more characteristics of an ambient signal to determine a probe-off condition. A physiological sensor may be used to emit one or more wavelengths of light. A light signal may be received that includes an ambient light component and one or more components corresponding to the emitted light. One or more characteristics (e.g., baseline characteristics) of the ambient light component may be determined and compared to one or more thresholds. The system may determine whether the physiological sensor is properly positioned based on the comparison.

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Номер записи: 149
18-09-2014 дата публикации

SYSTEMS AND METHODS FOR DETERMINING RESPIRATION INFORMATION FROM SEGMENTS OF A PHOTOPLETHYSMOGRAPH

Номер: US20140275889A1
Автор: Addison Paul Stanley, Watson James
Принадлежит:

A physiological monitoring system may determine respiration information from a PPG signal. The system may analyze the PPG signal with respect to itself by associating values of the PPG signal with values of a time-delayed version of the PPG signal to create pairs of associated values. A subset of associated values may be identified. Respiration metric values may be determined based on the subset of pairs. The respiration metric values may be amplitude values and/or time values corresponding to the subset of pairs. The respiration metric values may be analyzed using autocorrelation, cross-correlation, or other signal processing techniques to determine respiration information such as respiration rate. 1. A method for determining respiration information , the method comprising:receiving a photoplethysmograph (PPG) signal;associating values of the PPG signal with time delayed values of the PPG signal to generate pairs of associated values;analyzing the pairs of associated values to identify a subset of the pairs; anddetermining respiration information based at least in part on the subset of the pairs.2. The method of claim 1 , wherein the PPG signal is approximately centered about zero.3. The method of claim 1 , further comprising:receiving heart rate information; andselecting a time delay of the time delayed values of the PPG signal to be approximately one quarter of a period associated with the heart rate information.4. The method of claim 1 , wherein analyzing the pairs of associated values to identify a subset of the pairs comprises identifying pairs of associated values that approximately form a straight line when the pairs are considered in two-dimensional space.5. The method of claim 1 , wherein analyzing the pairs of associated values to identify a subset of the pairs comprises:determining angles corresponding to the pairs of associated values; andidentifying pairs of associated values whose angles correspond to a predetermined angle.6. The method of claim 1 , ...

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Номер записи: 150
18-09-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING REPETITIVE AIRFLOW REDUCTIONS

Номер: US20140275938A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

Certain embodiments of the present disclosure provide a system and method for determining a repetitive airflow reduction of an individual. The system may include a photoplethysmogram (PPG) detection module configured to detect a PPG signal of a patient. The PPG signal may include a pulsatile AC component superimposed on a DC baseline. The system may also include a PPG baseline analysis module configured to analyze the DC baseline of the PPG signal to detect one or more threshold crossings with respect to an acceptable threshold correlated to normal breathing. The system may also include a repetitive airflow reduction determination module configured to determine an occurrence of the repetitive airflow reduction through an analysis of the one or more threshold crossings. 1. A system for determining a repetitive airflow reduction of an individual , the system comprising:a photoplethysmogram (PPG) detection module configured to detect a PPG signal of a patient, wherein the PPG signal comprises a pulsatile AC component superimposed on a DC baseline;a PPG baseline analysis module configured to analyze the DC baseline of the PPG signal to detect one or more threshold crossings with respect to an acceptable threshold correlated to normal breathing; anda repetitive airflow reduction determination module configured to determine an occurrence of the repetitive airflow reduction through an analysis of the one or more threshold crossings.2. The system of claim 1 , wherein the repetitive airflow reduction determination module is configured to determine occurrence of the repetitive airflow reduction by determining an existence of a repeating pattern of multiple threshold crossings.3. The system of claim 1 , further comprising a correlation module configured to correlate airflow characteristics with the DC baseline.4. The system of claim 1 , wherein the repetitive airflow reduction determination module is further configured to determine a severity of the repetitive airflow ...

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Номер записи: 151
18-09-2014 дата публикации

SYSTEMS AND METHODS FOR IDENTIFYING PATIENT DISTRESS BASED ON A SOUND SIGNAL

Номер: US20140278388A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A sound signal from a patient may include information that may be used to determine multiple patient parameters. A patient monitor may determine respiration information such as respiration rate from the sound signal, for example based on modulations of the sound signal due to patient breathing. The patient monitor may also determine indications of patient distress based on a trained classifier, speech commands, or sound patterns. 1. A method comprising:receiving a sound signal from a sensor that senses sound from a patient;computing, with processing equipment, one or more metrics based on the sound signal;determining, with the processing equipment, a classification of the sound signal based on the one or more metrics and on a classifier, wherein the classifier is trained based on signal characteristics that correspond to patient distress;determining, with the processing equipment, whether the sound signal corresponds to patient distress based on the classification; andoutputting an indication of patient distress when patient distress is determined to be present.2. The method of claim 1 , further comprising:recognizing speech based on the sound signal;determining a command based on the recognized speech; andfurther determining whether the sound signal corresponds to patient distress based on the command.3. The method of claim 2 , wherein the command comprises one or more of a request for assistance claim 2 , an indication of pain level claim 2 , and a request for medication.4. The method of claim 1 , further comprising:identifying a candidate portion of the sound signal; andfurther determining whether the sound signal corresponds to patient distress based on the candidate portion.5. The method of claim 4 , wherein the candidate portion is identified based on one or more of a sound level claim 4 , pitch claim 4 , frequency claim 4 , a rate of change of the sound level claim 4 , a rate of change of the pitch claim 4 , and a rate of change of the frequency.6. The method ...

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Номер записи: 152
14-07-2016 дата публикации

METHODS AND SYSTEMS FOR RECALIBRATING A BLOOD PRESSURE MONITOR WITH MEMORY

Номер: US20160198963A1
Автор: Addison Paul Stanley, Watson James N.
Принадлежит:

Systems and methods are provided for storing and recalling metrics associated with physiological signals. It may be determined that the value of a monitored physiological metric corresponds to a stored value. In such cases, a patient monitor may determine that a calibration is not desired. In some cases, a patient monitor may recall calibration parameters associated with the stored value if it determined that the stored value corresponds to the monitored metric value. 1. A method for triggering a cuff-based blood pressure measurement of a subject , the method comprising:receiving a photoplethysmograph (PPG) signal from a sensor;monitoring, using a processor, a value of a metric derived at least in part from the PPG signal;comparing, using the processor, the value of the metric to a stored value;determining, using the processor, that the value of the metric does not correspond to the stored value based at least in part on the comparison;triggering, using the processor, the cuff-based blood pressure measurement in response to determining that the value of the metric does not correspond to the stored value; andexecuting, using an inflatable cuff, the cuff-based blood pressure measurement of the subject in response to the trigger.2. The method of claim 1 , further comprising updating claim 1 , using the processor claim 1 , the stored value in response to the trigger.3. The method of claim 2 , further comprising updating claim 2 , using the processor claim 2 , a set of blood pressure calibration parameters claim 2 , based at least in part on the cuff-based blood pressure measurement of the subject claim 2 , to generate an updated set of blood pressure calibration parameters.4. The method of claim 3 , further comprising determining claim 3 , using the processor claim 3 , non-invasive blood pressure based on the updated set of blood pressure calibration parameters and the PPG signal.5. The method of claim 4 , further comprising triggering claim 4 , using the processor ...

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Номер записи: 153
30-07-2015 дата публикации

SYSTEMS AND METHODS FOR DETERMINING RESPIRATION INFORMATION

Номер: US20150208964A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит:

Systems and methods are provided for determining respiration information. Respiration information is determined from physiological signals responsive to regional oxygen saturation information. Respiration information is determined based on any of the amplitude, frequency, or baseline components of the physiological signals. 1. A regional oximetry system comprising:an input for receiving a plurality of physiological signals responsive to regional oxygen saturation in a region of a subject's tissue; and ["determining whether the plurality of physiological signals contain a pulsatile component representing the subject's physiological pulse, and", 'when it is determined that the pulsatile component is present, determining respiration information based at least in part on the pulsatile component., 'a processor configured to perform operations comprising2. The system of claim 1 , wherein the respiration information comprises respiration rate.3. The system of claim 2 , wherein the processor is further configured to perform operations comprising:determining a period associated with the pulsatile component; anddetermining the respiration rate based at least in part on the period.4. The system of claim 1 , wherein the respiration information comprises respiration effort.5. The system of claim 4 , wherein the processor is further configured to perform operations comprising:determining an amplitude of the pulsatile component; anddetermining the respiration effort based at least in part on the amplitude.6. The system of claim 1 , wherein the processor is further configured to perform operations comprising:determining confidence information associated with each of the plurality of physiological signals;selecting at least one of the plurality of physiological signals based at least in part on the confidence information; anddetermining respiration information based at least in part on the selected physiological signals and on the pulsatile component.7. The system of claim 1 , ...

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Номер записи: 154
23-10-2014 дата публикации

SYSTEM AND METHOD FOR SCALING A FLUID RESPONSIVENESS METRIC

Номер: US20140316278A1
Автор: Addison Paul Stanley, McGonigle Scott, Wang Rui, Watson James N.
Принадлежит: COVIDIEN LP

The present invention relates to physiological signal processing, and in particular to methods and systems for processing physiological signals to predict a fluid responsiveness of a patient. A medical monitor for monitoring a patient may include an input receiving a photoplethysmograph (PPG) signal representing light absorption by a patient's tissue, and a fluid responsiveness predictor (FRP) calculator programmed to calculate an FRP metric. The monitor also may include a memory storing a relationship between the FRP metric and a pulse pressure variation (PPV) metric. The FRP metric is calculated based on a respiratory variation of the PPG signal and based on the relationship. 1. A medical monitor for monitoring a patient , comprising:an input receiving a photoplethysmograph (PPG) signal representing light absorption by a patient's tissue;a fluid responsiveness predictor (FRP) calculator programmed to calculate an FRP metric; anda memory storing a relationship between the FRP metric and a pulse pressure variation (PPV) metric,wherein the FRP metric is calculated based on a respiratory variation of the PPG signal and based on the relationship.2. The monitor of claim 1 , wherein the FRP metric comprises Delta POP.3. The monitor of claim 1 , wherein the FRP metric comprises slope transit time variation.4. The monitor of claim 1 , wherein the FRP metric comprises respiratory sinus arrhythmia.5. The monitor of claim 1 , wherein the relationship comprises a scaling factor applied to the FRP metric.6. The monitor of claim 1 , wherein the relationship comprises a shift applied to the FRP metric.7. The monitor of claim 1 , wherein the relationship comprises a mapping relationship mapping an FRP threshold value to a pulse pressure variation threshold value.8. The monitor of claim 1 , wherein the relationship is adjustable based on a user input or an update.9. The monitor of claim 1 , further comprising a display in communication with the FRP calculator to display the ...

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Номер записи: 155
23-10-2014 дата публикации

SYSTEM AND METHOD FOR DETERMINING RESPIRATORY PARAMETERS FROM BLOOD FLOW SIGNALS

Номер: US20140316286A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит: COVIDIEN LP

A system for determining one or more respiratory parameters of an individual may include a blood flow detection device configured to detect a blood flow signal of the individual, a blood flow determination module configured to form a blood flow waveform based on the blood flow signal, and a respiratory parameter analysis module configured to analyze the blood flow waveform and determine the respiratory parameter(s) from an analysis of the blood flow waveform. 1. A system for determining one or more respiratory parameters of an individual , the system comprising:a blood flow detection device configured to detect a blood flow signal of the individual;a blood flow determination module configured to form a blood flow waveform based on the blood flow signal; anda respiratory parameter analysis module configured to analyze the blood flow waveform and determine the one or more respiratory parameters from an analysis of the blood flow waveform.2. The system of claim 1 , wherein the one or more respiratory parameters includes respiration rate.3. The system of claim 2 , wherein the respiratory parameter analysis module is configured to determine the respiration rate by correlating a periodicity of the blood flow waveform with breaths of the individual.4. The system of claim 1 , wherein the one or more respiratory parameters includes respiratory effort.5. The system of claim 4 , wherein the respiratory parameter analysis module is configured to determine the respiratory effort through a determination of one or both of an amplitude or frequency of the blood flow waveform.6. The system of claim 5 , wherein the respiratory effort is directly proportional to one or both the amplitude or the frequency of the blood flow waveform.7. The system of claim 1 , wherein the respiratory parameter analysis module is configured to determine the one or more respiratory parameters through a correlation of portions of the blood flow waveform with breathing characteristics of the individual.8. ...

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Номер записи: 156
30-10-2014 дата публикации

SYSTEM AND METHOD FOR GENERATING AN ADJUSTED FLUID RESPONSIVENESS METRIC

Номер: US20140323822A1
Автор: Addison Paul Stanley, McGonigle Scott, Wang Rui, Watson James N.
Принадлежит: COVIDIEN LP

The present invention relates to physiological signal processing, and in particular to methods and systems for processing physiological signals to predict a fluid responsiveness of a patient. A medical monitor for monitoring a patient includes an input receiving a photoplethysmograph (PPG) signal representing light absorption by a patient's tissue. The monitor also includes a perfusion status indicator indicating a perfusion status of the PPG signal, and a fluid responsiveness predictor (FRP) calculator programmed to calculate an FRP value based on a respiratory variation of the PPG signal. The FRP calculator applies a correction factor based on the perfusion status indicator. 1. A medical monitor for monitoring a patient , comprising:an input receiving a photoplethysmograph (PPG) signal representing light absorption by a patient's tissue;a perfusion status indicator indicating a perfusion status of the PPG signal; anda fluid responsiveness predictor (FRP) calculator programmed to calculate an FRP value based on a respiratory variation of the PPG signal,wherein the FRP calculator applies a correction factor based on the perfusion status indicator.2. The monitor of claim 1 , wherein the correction factor is proportional to the patient's perfusion status.3. The monitor of claim 1 , wherein the FRP value comprises Delta POP.4. The monitor of claim 3 , wherein the perfusion status indicator comprises a modulation metric of the PPG signal.5. The monitor of claim 4 , wherein the modulation metric comprises a percent modulation of the PPG signal.6. The monitor of claim 5 , wherein the correction factor adjusts the Delta POP value in proportion to the percent modulation.7. The monitor of claim 1 , wherein the perfusion status indicator comprises a modulation metric of the PPG signal.8. The monitor of claim 1 , wherein the FRP calculator applies the correction factor when the perfusion status indicator indicates a low perfusion status.9. The monitor of claim 8 , wherein the ...

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Номер записи: 157
24-08-2017 дата публикации

SYSTEMS AND METHODS FOR VIDEO-BASED MONITORING OF VITAL SIGNS

Номер: US20170238842A1
Автор: Addison Paul Stanley, Foo David, Jacquel Dominique
Принадлежит:

The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals. Examples include flood fill methods and skin tone filtering methods. 1. A video-based method of measuring a patient's vital sign , comprising:receiving, from a video camera, a video signal having a field of view exposed to a patient;identifying, using a processor, a first seed point on the patient;flood filling, using the processor, a first contiguous region from the first seed point to a boundary;utilizing the first contiguous region to identify a target region;extracting, using the processor, a first intensity signal from the target region;measuring a vital sign from the first intensity signal; anddisplaying a number derived from the measured vital sign.2. The method of claim 1 , wherein flood filling the contiguous region comprises identifying claim 1 , adjacent the first seed point claim 1 , neighboring pixels or regions that share a common characteristic with the first seed point claim 1 , until the boundary is reached.3. The method of claim 2 , wherein the boundary comprises pixels that lack the common characteristic.4. The method of claim 3 , wherein the common characteristic comprises color values or intensity values within a range.5. The method of claim 3 , wherein the common characteristic comprises a shared frequency content.6. The method of claim 1 , wherein identifying the first seed point comprises recognizing a facial feature and locating the first seed point relative to the recognized facial feature.7. The method of claim 6 , wherein recognizing a facial feature comprises receiving a user input indicating the facial feature.8. The method of ...

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Номер записи: 158
15-09-2016 дата публикации

SYSTEMS AND METHODS FOR PHYSIOLOGICAL EVENT MARKING

Номер: US20160262640A1
Автор: Addison Paul Stanley, Manning Keith, Sethi Rakesh, Watson James N.
Принадлежит:

Systems and methods are provided for storing event markers. The value of a monitored physiological metric may be monitored and compared to a reference value. A patient monitoring system may compute a difference between a monitored metric and a reference value, and compare the difference to a threshold value to determine whether a physiological event has occurred. Based on the determination, a patient monitoring system may store an event marker, trigger a response, update a metric value, or perform any other suitable function. 1. A method for calibrating a blood pressure monitoring system using electronic processing equipment , the method comprising:receiving, using the electronic processing equipment, a physiological signal from a sensor;determining, using the electronic processing equipment, at least two of: pulse rate, pulse statistical moment, pulse wave centroid, pulse wave rotational moment, and photoplethysmograph (PPG) DC offset based on the physiological signal;calculating, using the electronic processing equipment, a composite metric value determined based on a combination of the at least two of: pulse rate, pulse statistical moment, pulse wave centroid, pulse wave rotational moment, and PPG DC offset;determining, using the electronic processing equipment, a calibration coefficient for the blood pressure monitoring system when the composite metric exceeds a threshold; andcalibrating the blood pressure monitoring system based on the calibration coefficient.2. The method of claim 1 , wherein the sensor is a pulse oximetry sensor configured to detect light attenuated by a subject and generate the physiological signal based on the detected attenuated light.3. The method of claim 2 , wherein the physiological signal is a PPG signal.4. The method of claim 1 , wherein the electronic processing equipment comprises a PPG monitor.5. The method of claim 1 , further comprising:calculating, using the electronic processing equipment, a blood pressure measurement of a ...

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Номер записи: 159
27-08-2020 дата публикации

SYSTEMS AND METHODS FOR VIDEO-BASED MONITORING OF VITAL SIGNS

Номер: US20200268281A1
Автор: Addison Paul Stanley, Foo David, Jacquel Dominique
Принадлежит:

The present invention relates to the field of medical monitoring, and in particular non-contact, video-based monitoring of pulse rate, respiration rate, motion, and oxygen saturation. Systems and methods are described for capturing images of a patient, producing intensity signals from the images, filtering those signals to focus on a physiologic component, and measuring a vital sign from the filtered signals. Examples include flood fill methods and skin tone filtering methods. 1. A video-based method of measuring a patient's vital sign , comprising:receiving, from a video camera, a video signal having a field of view;identifying, using a processor, a first seed point in the field of view;flood filling, using the processor, a first contiguous region from the first seed point to a boundary;extracting, using the processor, a first intensity signal from the first contiguous region;measuring a vital sign from the first intensity signal; anddynamically updating the contiguous region over time, including tracking the first seed point and updating the first contiguous region to create a dynamically morphing contiguous region.2. The method of claim 1 , wherein flood filling the contiguous region comprises identifying claim 1 , adjacent the first seed point claim 1 , neighboring pixels or regions that share a common characteristic with the first seed point claim 1 , until the boundary is reached.3. The method of claim 2 , wherein the boundary comprises pixels that lack the common characteristic.4. The method of claim 3 , wherein the common characteristic comprises color values or intensity values within a range.5. The method of claim 3 , wherein the common characteristic comprises a shared frequency content.6. The method of claim 1 , wherein identifying the first seed point comprises recognizing a facial feature and locating the first seed point relative to the recognized facial feature.7. The method of claim 6 , wherein recognizing a facial feature comprises receiving a user ...

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Номер записи: 160
20-10-2016 дата публикации

PROCESSING AND DETECTING BASELINE CHANGES IN SIGNALS

Номер: US20160302737A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит:

Systems and methods for detecting the occurrence of events from a signal are provided. A signal processing system may analyze baseline changes and changes in signal characteristics to detect events from a signal. The system may also detect events by analyzing energy parameters and artifacts in a scalogram of the signal. Further, the system may detect events by analyzing both the signal and its corresponding scalogram. 1. A method for recalibrating a medical monitor based on detection of a physiological event , the method comprising:receiving a physiological signal from a physiological sensor attached to a subject;calculating, using the medical monitor, a physiological parameter of the subject based on the physiological signal;transforming, using the medical monitor, the physiological signal to generate a transformed physiological signal;generating, using the medical monitor, a scalogram from the transformed physiological signal;identifying, using the medical monitor, an artifact in the scalogram;determining, using the medical monitor, at least one of size and shape of the identified artifact;detecting, using the medical monitor, an occurrence of the physiological event based on at least one of the size and the shape of the identified artifact; andtriggering, using the medical monitor, a recalibration of the medical monitor in response to detecting the occurrence of the physiological event.2. The method of claim 1 , wherein the medical monitor comprises at least one of a pulse oximetry monitor claim 1 , an electrocardiogram monitor claim 1 , an electroencephalogram claim 1 , an electrogastrogram monitor claim 1 , an electromyogram monitor claim 1 , and a multi-parameter monitor.3. The method of claim 1 , wherein the artifact is a high energy broad-scale cone.4. The method of claim 1 , wherein the physiological event comprises at least one of a change in blood pressure claim 1 , a change in body position claim 1 , vasodilation claim 1 , vasoconstriction claim 1 , ...

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Номер записи: 161
24-12-2015 дата публикации

METHOD OF ANALYZING AND PROCESSING SIGNALS

Номер: US20150366511A1
Автор: Addison Paul Stanley, Watson James Nicholas
Принадлежит:

According to embodiments, a system for processing a physiological signals is disclosed. The system may comprise a sensor for generating the physiological signal. The system may comprise a processor configured to receive and process the physiological signal in order to improve interpretation and subsequent analysis of the physiological signal. The processor may be configured to generate a wavelet transform based on the physiological signal. The processor may be configured to determine phase values corresponding to the subject's respiration based on the wavelet transform. The processor may be configured to generate a sinusoidal waveform that is representative of the subject's breathing based on the phase values. The system may also comprise a display device configured to display the sinusoidal waveform. 1. A method for processing a physiological signal of a subject , comprising:receiving, using a processor, the physiological signal from a sensor;generating, using the processor, a wavelet transform based on the physiological signal, wherein the wavelet transform comprises phase information;determining, using the processor, phase values corresponding to the subject's respiration based on the wavelet transform;generating, using the processor, a sinusoidal waveform based on the phase values, wherein the sinusoidal waveform is representative of the subject's breathing; anddisplaying, using a display device, the sinusoidal waveform.2. The method of claim 1 , wherein determining the phase values comprises determining the phase values based on the wavelet transform and a secondary wavelet transform.3. The method of claim 1 , wherein determining the phase values comprises identifying a respiration ridge based on the wavelet transform.4. The method of claim 3 , wherein determining the phase values further comprises superimposing the identified respiration ridge onto the phase information.5. The method of claim 1 , wherein determining the phase values comprises processing the ...

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Номер записи: 162
05-11-2020 дата публикации

MEASURING RESPIRATORY PARAMETERS FROM AN ECG DEVICE

Номер: US20200345270A1
Автор: Addison Paul Stanley, BARTLETT DANIEL WAYNE, Watson James N.
Принадлежит:

Methods, systems, and devices for measuring respiratory parameters from an ECG device are described. The method may include receiving an electrocardiogram (ECG) signal associated with a patient. The method may further include detecting a change in modulation of the ECG signal between a first portion of the ECG signal and a second portion of the ECG signal. The method may further include determining a change in respiratory effort of the patient based at least in part on the change in modulation. 1. A method of patient monitoring , comprising:receiving an electrocardiogram (ECG) signal associated with a patient;detecting a change in a frequency modulation of the ECG signal between a first portion of the ECG signal and a second portion of the ECG signal; anddetermining a change in respiratory effort of the patient based at least in part on the change in the frequency modulation.2. The method of claim 1 , wherein detecting the change in the frequency modulation comprises:detecting a frequency modulation of a first plurality of R-waves from the first portion of the ECG signal; anddetecting a frequency modulation of a second plurality of R-waves from the second portion of the ECG signal.3. The method of claim 2 , further comprising:comparing the frequency modulation of the first plurality of R-waves from the first portion of the ECG signal with the frequency modulation of the second plurality of R-waves from the second portion of the ECG signal.4. The method of claim 3 , wherein a difference between a maximum R-wave frequency and a minimum R-wave frequency in the second portion of the ECG signal is greater than a difference between a maximum R-wave frequency and a minimum R-wave frequency in the first portion of the ECG signal.5. The method of claim 1 , wherein detecting the change in the frequency modulation comprises:detecting a baseline of a first plurality of R-waves from the first portion of the ECG signal; anddetecting a baseline of a second plurality of R-waves ...

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Номер записи: 163
19-12-2019 дата публикации

SYSTEMS AND METHODS FOR VIDEO-BASED PATIENT MONITORING DURING SURGERY

Номер: US20190380807A1
Автор: Addison Paul Stanley, Foo David Ming Hui, Jacquel Dominique
Принадлежит:

The present invention relates to the field of medical monitoring, and in particular non-contact monitoring of one or more physiological parameters in a region of a patient during surgery. Systems, methods, and computer readable media are described for generating a pulsation field and/or a pulsation strength field of a region of interest (ROI) in a patient across a field of view of an image capture device, such as a video camera. The pulsation field and/or the pulsation strength field can be generated from changes in light intensities and/or colors of pixels in a video sequence captured by the image capture device. The pulsation field and/or the pulsation strength field can be combined with indocyanine green (ICG) information regarding ICG dye injected into the patient to identify sites where blood flow has decreased and/or ceased and that are at risk of hypoxia. 1. A video-based patient monitoring system , comprising:at least one processor; anda non-contact detector having at least one video camera, [ capture a red, green, blue (RGB) video sequence of a region of interest (ROI) to generate an RGB view of the ROI; and', 'capture an indocyanine green (ICG) video sequence of the ROI to generate an ICG view of the ROI, and, 'the at least one video camera is configured to, calculate color changes in pixels of RGB images within the RGB video sequence;', 'assign one or more colors from a predetermined color scheme to the pixels of the RGB images based at least in part on the sign and/or magnitude of the color changes to generate a pulsation field;', 'calculate percentage ICG contours from the ICG video sequence; and', 'superimpose the percentage ICG contours onto the RGB view to generate an enhanced ICG overlay view., 'the at least one processor is configured to], 'wherein'}2. The video-based patient monitoring system of claim 1 , wherein the at least one video camera includes an RGB video camera claim 1 , an infrared (IR) video camera claim 1 , and/or a monochrome camera ...

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Номер записи: 164
17-08-2006 дата публикации

Improvements in or relating to signal analysis

Номер: WO2006085120A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: Cardiodigital Limited

A method of analysis of medical signals is presented which provides useful clinical information concerning the state of the myocardium during cardiopulmonary resuscitation (CPR). The analysis during CPR can be used to (i) identify the underlying rhythm, (ii) provide a measure of the efficacy of CPR, and (iii) to predict the outcome from a defibrillation shock.

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Номер записи: 165
07-01-2010 дата публикации

Systems and methods for determining effort

Номер: CA2728075A1
Автор: James Nicholas Watson, Paul Stanley Addison
Принадлежит: Nellcor Puritan Bennett Ireland ULC

According to embodiments, methods and systems for deter-mining effort is disclosed. Effort may relate to a measure of strength of at least one repetitive feature in a signal. Effort may also relate to physical ef-fort or work of a process (e.g., respiratory effort) that may affect the signal (e.g., a PPG signal). Effort may be determined through feature analysis of a transformed signal that has been transformed via a continuous wavelet transform. For example, respiratory effort may be determined using a scalo-gram generated based at least in part on a wavelet transform of a physiolog-ical signal and analyzing features of the scalogram.

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Номер записи: 166
24-11-2015 дата публикации

Consistent signal selection by signal segment selection techniques

Номер: CA2728437C
Автор: James Nicholas Watson, Paul Stanley Addison, Scott Mcgonigle
Принадлежит: Nellcor Puritan Bennett Ireland ULC

According to embodiments, techniques for selecting a consistent part of a signal, including a photoplethysmograph (PPG) signal, are disclosed. A pulse oximetry system including a sensor or probe may be used to obtain a PPG signal from a subject. Signal peaks may be identified in the PPG signal. Characteristics of the signal peaks, including the amplitude levels of the signal peaks and/or the time-distance between the signal peaks may be used to determine if the PPG signal is consistent. In an embodiment, signal peaks are processed based on a consistency metric, and the processed signal peaks are compared to the consistency metric to determine if the PPG signal is consistent. If the PPG signal is determined to be consistent, the PPG signal may be further analyzed to determine an underlying signal parameter, including, for example, a patient respiration rate. If the PPG signal is determined to be inconsistent, the inconsistent portion of the signal may be removed from the overall signal or otherwise transformed.

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Номер записи: 167
29-12-2015 дата публикации

Determining a characteristic respiration rate

Номер: US9220440B2
Автор: James Nicholas Watson, Paul Stanley Addison, Scott Mcgonigle
Принадлежит: Nellcor Puritan Bennett Ireland ULC

The present disclosure relates to monitoring a characteristic respiration rate of a patient based at least in part on a suitable time period that either precedes or follows a triggering event, such as a clinician/patient interaction, where the triggering event may negatively impact the physiological parameter. In some embodiments, physiological parameter values falling between one or more pre-set thresholds may be used to derive the characteristic physiological parameter. In some embodiments, monitoring the respiration rate may provide additional information about the patient's status. In some embodiments, confidence measures may be associated with, or may be used to analyze features of the patient signal to derive information about, the characteristic respiration rate. The patient signal used to derive a patient's respiration rate may be of an oscillatory nature or may include oscillatory features that may be analyzed to derive a characteristic respiration rate.

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Номер записи: 168