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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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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 284. Отображено 102.
16-02-2017 дата публикации

SYSTEMS AND METHODS FOR LEADLESS PACING AND SHOCK THERAPY

Номер: US20170043174A1
Автор: Saul E. GREENHUT, Robert J. NEHLS, Walter H. OLSON, Xusheng ZHANG, Wade M. DEMMER, Troy E. JACKSON, James D. REINKE, GREENHUT SAUL E, NEHLS ROBERT J, OLSON WALTER H, ZHANG XUSHENG, DEMMER WADE M, JACKSON TROY E, REINKE JAMES D, GREENHUT Saul E., NEHLS Robert J., OLSON Walter H., ZHANG Xusheng, DEMMER Wade M., JACKSON Troy E., REINKE James D.
Принадлежит:

Techniques and systems for monitoring cardiac arrhythmias and delivering electrical stimulation therapy using a subcutaneous implantable cardioverter defibrillator (SICD) and a leadless pacing device (LPD) are described. For example, the SICD may detect a tachyarrhythmia within a first electrical signal from a heart and determine, based on the tachyarrhythmia, to deliver anti-tachyarrhythmia shock therapy to the patient to treat the detected arrhythmia. The LPD may receive communication from the SICD requesting the LPD deliver anti-tachycardia pacing to the heart and determine, based on a second electrical signal from the heart sensed by the LPD, whether to deliver anti-tachycardia pacing (ATP) to the heart. In this manner, the SICD and LPD may communicate to coordinate ATP and/or cardioversion/defibrillation therapy. In another example, the LPD may be configured to deliver post-shock pacing after detecting delivery of anti-tachyarrhythmia shock therapy. 1. A leadless pacing device (LPD) comprising:a housing;a set of two or more electrodes carried on the housing and configured to sense electrical signals of the heart;a processor within the housing and configured to receive an indication of a detected tachyarrhythmia;a shock detector within the housing and configured to detect delivery of anti-tachyarrhythmia shock therapy, wherein the processor activates the shock detector in response to receiving the indication of the detected tachyarrhythmia; anda signal generator within the housing and configured to generate and deliver, in response to the detection of the delivery of anti-tachyarrhythmia shock therapy, post-shock pacing therapy to the heart of the patient via at least a subset of the set of electrodes.2. The LPD of claim 1 , wherein the processor is configured to receive the indication of the detected tachyarrhythmia by analyzing the sensed electrical signals to detect the tachyarrhythmia.3. The LPD of claim 2 , further comprising an activity sensor configured ...

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Номер записи: 1
10-11-2016 дата публикации

T-WAVE OVERSENSING REJECTION

Номер: US20160325106A1
Автор: Jian CAO, Xusheng ZHANG, Robert W. STADLER, CAO JIAN, ZHANG XUSHENG, STADLER ROBERT W, CAO Jian, ZHANG Xusheng, STADLER Robert W.
Принадлежит:

A medical device coupled to extracardiac electrodes is configured to analyze a cardiac electrical signal over a signal analysis segment to determine if shockable rhythm classification criteria are met, determine that TWOS detection criteria are met for the signal analysis segment when a predetermined number of TWOS analysis windows are classified as TWOS, and classify the signal analysis segment as non-shockable in response to determining that the TWOS detection criteria are met.

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Номер записи: 2
01-12-2016 дата публикации

METHOD AND APPARATUS FOR VERIFYING DISCRIMINATING OF TACHYCARDIA EVENTS IN A MEDICAL DEVICE HAVING DUAL SENSING VECTORS

Номер: US20160346558A1
Автор: Xusheng ZHANG, ZHANG XUSHENG, ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector sensing a first interval and a second sensing vector simultaneously sensing a second, determining, for each of the first interval and the second interval, whether each beat of the plurality of beats is one of a match beat and a non-match beat, determining whether each beat of the plurality of beats is one of a high confidence beat and a low confidence beat, determining, for each of the first interval and the second interval, the number of beats determined to be both a non-match beat and a high confidence beat is greater than a non-match threshold, and determining whether to deliver therapy for the cardiac event in response to identifying of each of the first interval and the second interval as being one of shockable and not shockable.

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Номер записи: 3
20-07-2017 дата публикации

METHOD AND APPARATUS FOR VERIFYING DISCRIMINATING OF TACHYCARDIA EVENTS IN A MEDICAL DEVICE HAVING DUAL SENSING VECTORS

Номер: US20170203114A1
Автор: Xusheng ZHANG, ZHANG XUSHENG, ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, sensing a plurality of beats in response to the sensed cardiac signals, identifying each beat of the plurality of beats as one of a normal beat and a not normal beat, determining at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range, and identifying the cardiac event as being one of shockable and not shockable in response to the determining. 1. A method of detecting a cardiac event in a medical device , comprising:sensing cardiac signals from a plurality of electrodes;sensing a plurality of beats in response to the sensed cardiac signals;identifying each beat of the plurality of beats as one of a normal beat and a not normal beat;determining at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range; andidentifying the cardiac event as being one of shockable and not shockable in response to the determining.2. The method of claim 1 , wherein the plurality of electrodes form a first sensing vector and a second sensing vector claim 1 , the method further comprising:performing a gross morphology analysis of a signal sensed along the first sensing vector during a predetermined sensing window and a signal sensed along the second sensing vector during the predetermined sensing window; andidentifying the cardiac event as being one of shockable and not shockable in response to the ...

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Номер записи: 4
28-07-2016 дата публикации

METHOD AND APPARATUS FOR BEAT ACQUISITION DURING TEMPLATE GENERATION IN A MEDICAL DEVICE HAVING DUAL SENSING VECTORS

Номер: US20160213311A1
Автор: Xusheng ZHANG, ZHANG XUSHENG, ZHANG Xusheng
Принадлежит:

Techniques are described for generating beat templates and utilizing those beat templates to detect a cardiac event, e.g., a tachyarrhythmia. In particular, example methods and devices for acquiring qualified beats for template generation are described. Additionally, techniques are described for selecting subsets of the qualified beats to actually use in generating a beat template. 1. A method of acquiring qualified beats for template generation in a cardiac medical device comprising:obtaining a first cardiac signal on a first sensing vector formed via a first subset of a plurality of extravascular electrodes;obtaining a second cardiac signal on a second sensing vector formed via a second subset of the plurality of extravascular electrodes having at least one electrode different than the first subset, wherein the second cardiac signal is obtained concurrently with the first cardiac signal;identifying beats within the first cardiac signal and the second cardiac signal;applying beat qualification criteria to the beats within the first cardiac signal and the second cardiac signal to determine whether each of the beats is a qualified beat; andgenerating a beat template based on at least a portion of the beats determined to be qualified beats.2. The method of claim 1 , wherein applying the beat qualification criteria comprises:estimating a heart rate; anddetermining the beats are not qualified beats for generating the beat template when the estimated heart rate is greater than or equal to a threshold heart rate at the time the beats were sensed.3. The method of claim 2 , wherein the threshold heart rate is at least one of a ventricular tachycardia threshold heart rate and a ventricular fibrillation threshold heart rate.4. The method of claim 2 , wherein applying the beat qualification criteria further comprises:selecting a first identified beat of the first cardiac signal;selecting a second identified beat of the second cardiac signal closest in time to the first ...

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Номер записи: 5
27-04-2017 дата публикации

METHOD AND APPARATUS FOR DETECTING ARRHYTHMIAS IN A SUBCUTANEOUS MEDICAL DEVICE

Номер: US20170113055A1
Автор: Raja N. GHANEM, Robert W. STADLER, Xusheng ZHANG, GHANEM RAJA N, STADLER ROBERT W, ZHANG XUSHENG, GHANEM Raja N., STADLER Robert W., ZHANG Xusheng
Принадлежит: MEDTRONIC INC

A method and apparatus for detecting a cardiac event in a medical device that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector, initiating charging of an energy storage device in response to the sensed cardiac signals, and determining whether a predetermined number of morphologies associated with cardiac signals sensed along the first sensing vector and the second sensing vector during corresponding sensing windows are indicative of the cardiac event.

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Номер записи: 6
05-01-2012 дата публикации

System and method for establishing episode profiles of detected tachycardia episodes

Номер: US20120004566A1
Автор: Douglas A. Hettrick, Robert W. Stadler, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A medical device and associated method sense a cardiac signal and initiate an arrhythmia episode detection process in response to the cardiac signal by enabling an arrhythmia detection counter to be adjusted during the detection process. Data is accumulated relating to cardiac events during the detection process. An arrhythmia episode profile is established using the accumulated data. The accumulated data includes a pattern of the adjustment of the detection counter during the detection process

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Номер записи: 7
26-04-2012 дата публикации

OPTIMIZATION OF ARRHYTHMIA DETECTION BASED ON PATIENT ACTIVITY

Номер: US20120101392A1
Автор: Bhunia Sourav K., ZHANG Xusheng
Принадлежит:

An implantable medical device is configured to perform a method for detecting cardiac events by sensing a patient activity signal and determining a patient activity trend in response to the activity signal. A cardiac event detection threshold is set in response to the patient activity trend. The device senses a cardiac signal and detects a cardiac event in response to the cardiac signal and the detection threshold. 1. A method for detecting cardiac events for use in an implantable medical device , comprising:sensing a patient activity signal;determining a patient activity trend in response to the activity signal;setting a cardiac event detection threshold in response to the patient activity trend;sensing a cardiac signal; anddetecting a cardiac event in response to the cardiac signal and the detection threshold.2. The method of claim 1 , wherein the detection threshold comprises a number of cardiac intervals required to detect the cardiac event.3. The method of claim 1 , wherein sensing the activity signal comprises sensing an accelerometer signal claim 1 , the accelerometer positioned in a housing of the implantable medical device.4. The method of claim 1 , further comprising:establishing an activity threshold;detecting a threshold crossing of the activity signal;starting a delay interval in response to the threshold crossing; andsetting the cardiac event detection threshold upon expiration of the delay interval if the activity signal does not cross the threshold again before expiration of the delay interval.5. The method of claim 1 , further comprising:establishing a cardiac event onset threshold relating to one of a cardiac interval and a cardiac signal morphology;determining whether the onset threshold has been met; anddetermining the patient activity trend and setting the detection threshold in response to the onset threshold being met.6. The method of claim 1 , further comprising establishing a first detection threshold value and a second detection threshold ...

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Номер записи: 8
26-04-2012 дата публикации

SYSTEM AND METHOD FOR DERIVING RESPIRATION FROM INTRACARDIAC ELECTROGRAMS (EGM) OR ECG SIGNALS

Номер: US20120101393A1
Автор: Gillberg Jeffrey M., ZHANG Xusheng
Принадлежит:

A method and apparatus for monitoring respiration in a patient sense a cardiac electrical signal and detect signal peaks from the cardiac electrical signal. A peak amplitude waveform is generated from the signal peaks. a first derivative of the peak amplitude waveform is computed. Inspiration pulses are derived from the first derivative signal, and a respiration metric can be computed using the inspiration pulses derived from the cardiac electrical signal. 1. A method for monitoring respiration in a patient , the method comprising:sensing a cardiac electrical signal;detecting a plurality of signal peaks of the cardiac electrical signal;generating a peak amplitude waveform in response to the plurality of signal peaks;computing a first derivative signal of the peak amplitude waveform;deriving inspiration pulses in response to the first derivative signal; andcomputing a respiration metric in response to the inspiration pulses.2. The method of claim 1 , wherein deriving inspiration pulses in response to the first derivative signal comprises:establishing an amplitude threshold;identifying a positive-going amplitude threshold crossing of the first derivative signal; anddefining an onset of the inspiration pulse in response to the positive-going threshold crossing.3. The method of claim 2 , further comprising identifying a negative-going threshold crossing of the first derivative signal following the positive-going threshold crossing claim 2 , and defining an end of the inspiration pulse in response to the negative-going threshold crossing.4. The method of claim 3 , further comprising:establishing a width threshold;comparing the width threshold to an inspiration pulse width defined by the onset and the end of the inspiration pulse; andrejecting the inspiration pulse in response to the pulse width being less than the width threshold.5. The method of claim 1 , wherein computing a respiration metric comprises determining a peak value of the first derivative waveform.6. The ...

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Номер записи: 9
15-11-2012 дата публикации

TECHNIQUES FOR DETERMINING CARDIAC CYCLE MORPHOLOGY

Номер: US20120289846A1
Автор: Gillberg Jeffrey M., ZHANG Xusheng
Принадлежит: Medtronic, Inc.

A method includes storing an electrogram (EGM) template in a memory. The EGM template includes first and second alignment points at first and second peaks of the EGM template, respectively. The method further includes identifying first and second peaks of a cardiac cycle EGM acquired by a medical device and selecting one of the first and second peaks of the cardiac cycle EGM to align with one of the first and second alignment points based on an order in which the first and second peaks of the cardiac cycle EGM occur. Additionally, the method includes aligning the selected one of the first and second peaks with one of the first and second alignment points and determining an amount of similarity between the cardiac cycle EGM and the EGM template after alignment. 1. A method comprising:storing an electrogram (EGM) template in a memory, the EGM template including first and second alignment points at first and second peaks of the EGM template, respectively;identifying first and second peaks of a cardiac cycle EGM acquired by a medical device;selecting one of the first and second peaks of the cardiac cycle EGM to align with one of the first and second alignment points based on an order in which the first and second peaks of the cardiac cycle EGM occur;aligning the selected one of the first and second peaks with one of the first and second alignment points; anddetermining an amount of similarity between the cardiac cycle EGM and the EGM template after alignment.2. The method of claim 1 , wherein the EGM template includes a normal cardiac electrical conduction pattern.3. The method of claim 2 , further comprising determining that the cardiac cycle EGM includes a normal cardiac electrical conduction pattern when the amount of similarity is greater than a threshold amount of similarity.4. The method of claim 1 , wherein identifying the first and second peaks of the cardiac cycle EGM comprises:identifying the largest peak of the cardiac cycle EGM having the same polarity as ...

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Номер записи: 10
22-11-2012 дата публикации

Phrenic nerve stimulation detection using heart sounds

Номер: US20120296387A1
Автор: Jeffrey M. Gillberg, Paul J. Degroot, Thomas J. Mullen, Xusheng Zhang
Принадлежит: Massachusetts Institute of Technology, MEDTRONIC INC

A method of delivering phrenic nerve stimulation in a medical device system that includes detecting an activation event, delivering phrenic nerve stimulation therapy in response to the detected activation event, sensing a heart sound signal, in response to the delivered phrenic nerve stimulation therapy, monitoring a portion of the sensed heart sound signal, the portion defined by a predetermined window ocurring after the delivered phrenic nerve stimulation therapy, and determining whether the delivered phrenic nerve stimulation therapy was successful in response to the monitoring.

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Номер записи: 11
22-11-2012 дата публикации

Phrenic nerve stimulation detection using heart sounds

Номер: US20120296388A1
Автор: Jeffrey M. Gillberg, Paul J. Degroot, Thomas J. Mullen, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A method and system of detecting phrenic nerve stimulation in a patient that includes detecting an activation event, obtaining a heart sound signal of a patient from an implanted heart sound sensor, determining that an electrical stimulation has been applied to the patient, in response to detecting the activation event, monitoring a portion of the heart sound signal, the portion defined by a predetermined window after the application of the electrical stimulation, and determining whether phrenic nerve stimulation occurred based on the portion of the heart sound signal.

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Номер записи: 12
29-11-2012 дата публикации

ACOUSTIC BASED COUGH DETECTION

Номер: US20120302898A1
Автор: Sharma Vinod, Warman Eduardo N., ZHANG Xusheng
Принадлежит: Medtronic, Inc.

The present disclosure is directed to the detection of coughs and coughing episodes using acoustic signals. In various examples, an implantable medical device processes an acoustic signal obtained from an acoustic sensor to determine whether a patient has coughed. In some examples, the implantable medical device also performs a cough severity assessment. In some examples, the cough severity assessment may include a determination of the depth of the cough, the duration of the coughing episode, or whether the cough was wet or dry. 1. A method comprising:receiving an acoustic signal from an acoustic sensor implanted in a patient;receiving a patient activity signal from an activity sensor implanted in the patient;analyzing the acoustic signal in combination with the patient activity signal; anddetermining whether a cough has occurred based on the analysis of the acoustic signal in combination with the patient activity signal.2. The method of claim 1 , further comprising determining a severity of the cough based on the analysis of the acoustic signal and the patient activity signal.3. The method of claim 2 , further comprising incrementing a cough index by an amount that is determined as a function of the severity of the cough.4. The method of claim 2 , wherein determining a severity of the cough comprises determining a duration and frequency of a cough episode.5. The method of claim 2 , wherein determining a severity of the cough comprises determining an amplitude of the cough.6. The method of claim 1 , further comprising determining a depth of the cough based on one or more of the acoustic signal and the patient activity signal.7. The method of claim 1 , further comprising determining if the cough is a wet cough based on the acoustic signal:8. The method of claim 1 , further comprising updating a cough index based on the determination of whether a cough has occurred.9. The method of claim 8 , further comprising sending a notification when the cough index passes a ...

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Номер записи: 13
31-01-2013 дата публикации

SYSTEM AND METHOD FOR PACING PARAMETER OPTIMIZATION USING HEART SOUNDS

Номер: US20130030484A1
Автор: Gillberg Jeffrey M., Mullen Thomas J., ZHANG Xusheng
Принадлежит:

A medical device system and associated method predict a patient response to a cardiac therapy. The system includes for delivering cardiac pacing pulses to a patient's heart coupled to a cardiac sensing module and a cardiac pacing module for generating cardiac pacing pulses and controlling delivery of the pacing pulses at multiple pace parameter settings. An acoustical sensor obtains heart sound signals. A processor is enabled to receive the heart sound signals, derive a plurality of heart sound signal parameters from the heart sound signals, and determine a trend of each of the plurality of heart sound signal parameters with respect to the plurality of pace parameter settings. An external display is configured to present the trend of at least one heart sound parameter with respect to the plurality of pace parameter settings. 1. A medical device system , comprising:a plurality of electrodes for delivering cardiac pacing pulses to a patient's heart;a cardiac sensing module coupled to the plurality of electrodes;a cardiac pacing module coupled to the plurality of electrodes for generating cardiac pacing pulses and controlling delivery of the pacing pulses at a plurality of pace parameter settings;an acoustical sensor for obtaining heart sound signals; anda processor enabled to control the pacing module to delivery the pacing pulses, receive the heart sound signals, derive a plurality of heart sound signal parameters from the heart sound signals, and determine a trend of each of the plurality of heart sound signal parameters with respect to the plurality of pace parameter settings; andan external display configured to present the trend of at least one heart sound parameter with respect to the plurality of pace parameter settings.2. The system of claim 1 , wherein the processor is further configured to identify an optimal pace parameter setting from the plurality of pace parameter settings; andthe external display is further configured to present the optimal pace ...

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Номер записи: 14
28-02-2013 дата публикации

SYSTEM AND METHOD FOR PROFILING A PATIENTS HEMODYNAMIC RESPONSE BASED ON HEART SOUNDS

Номер: US20130053716A1
Автор: Gillberg Jeffrey M., ZHANG Xusheng
Принадлежит:

A medical device system includes electrodes for delivering cardiac pacing pulses to a patient's heart, a cardiac sensing module coupled to the electrodes and a cardiac pacing module coupled to the electrodes for generating cardiac pacing pulses. An acoustical sensor is used for obtaining heart sound signals. The system includes a processor that is configured to establish multiple conditions during which heart sound signals are received. The processor derives heart sound signal parameters from the heart sound signals and determines a heart sound profile comprising a trend of each of the heart sound signal parameters with respect to the multiple established conditions. 1. A medical device system , comprising:a plurality of electrodes for delivering cardiac pacing pulses to a patient's heart;a cardiac sensing module coupled to the plurality of electrodes;a cardiac pacing module coupled to the plurality of electrodes for generating cardiac pacing pulses;an acoustical sensor for obtaining heart sound signals; anda processor configured to establish a plurality of conditions for acquiring heart sound signals, receive the heart sound signals during each of the plurality of established conditions, derive a plurality of heart sound signal parameters from the heart sound signals, and determine a heart sound response profile comprising a trend of each of the plurality of heart sound signal parameters with respect to the plurality of established conditions.2. The system of claim 1 , further comprising a physiological sensor claim 1 , wherein establishing the plurality of conditions by the processor comprises verifying a physiological condition in response to a signal received from the physiological sensor.3. The system of claim 1 , wherein establishing the plurality of conditions by the processor comprises controlling the cardiac pacing module to deliver the cardiac pacing pulses at a plurality of pace parameter settings.4. The system of claim 1 , further comprising a memory ...

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Номер записи: 15
02-05-2013 дата публикации

METHOD FOR MONITORING PHRENIC NERVE FUNCTION

Номер: US20130109994A1
Автор: CHO Yong K., RANSOM Scott A., ZHANG Xusheng
Принадлежит: MEDTRONIC CRYOCATH LP

Systems and methods for monitoring phrenic nerve function of a patient are disclosed, including, including establishing a diaphragmatic movement value threshold; positioning a diaphragmatic movement sensor on an external surface of an abdomen of the patient; applying a treatment regimen to a tissue region in proximity to the phrenic nerve; measuring a diaphragmatic movement value with the diaphragmatic movement sensor; comparing the measured diaphragmatic movement value to the established diaphragmatic movement value threshold; and generating an alert in response to the comparison. 1. A method of monitoring phrenic nerve function of a patient , comprising:establishing a diaphragmatic movement value threshold;positioning a diaphragmatic movement sensor on the patient so as to detect diaphragmatic movement;applying a treatment regimen to a tissue region in proximity to the phrenic nerve;measuring a diaphragmatic movement value with the diaphragmatic movement sensor;comparing the measured diaphragmatic movement value to the established diaphragmatic movement value threshold; andgenerating an alert in response to the comparison.2. The method of claim 1 , wherein the diaphragmatic movement sensor is positioned on an external surface of an abdomen of the patient.3. The method of claim 1 , wherein establishing the diaphragmatic movement value threshold includes pacing the phrenic nerve and measuring a diaphragmatic movement value in response to the pacing.4. The method of claim 1 , wherein the diaphragmatic movement value threshold includes a range of values.5. The method of claim 1 , wherein the diaphragmatic movement sensor includes one or more accelerometers.6. The method of claim 1 , wherein the diaphragmatic movement value includes the rate of a single thoracic excursion.7. The method of claim 1 , wherein the diaphragmatic movement value includes an amplitude of a thoracic excursion.8. The method of claim 1 , wherein the diaphragmatic movement value includes a ...

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Номер записи: 16
12-09-2013 дата публикации

HEART SOUND SENSING TO REDUCE INAPPROPRIATE TACHYARRHYTHMIA THERAPY

Номер: US20130237872A1
Автор: Brown Mark L., DeGroot Paul J., Gillberg Jeffrey M., Whitman Teresa A., ZHANG Xusheng
Принадлежит:

Techniques for reducing inappropriate tachyarrhythmia therapy and associated medical device systems are described. In some examples a processor is enabled to receive a cardiac electrical signal representative of electrical activity of a heart of a patient and provide an indication of cardiac electrical signal reliability. A heart sound analyzing module is enabled to receive the indication of cardiac electrical signal reliability and a heart sound signal representing sounds generated by the heart of the patient and generated by a heart sound sensor. The heart sound analyzing module selectively determines an ensemble averaged heart sound signal or detects a plurality of heart sounds from the heart sound signal in response to the indication of cardiac electrical signal reliability. 1. A method , comprising:sensing a cardiac electrical signal representative of electrical activity of a heart of a patient and determining an indication of signal reliability corresponding to the sensed cardiac signal;determining an ensemble averaged heart sound signal dependent on the sensed cardiac signal in response to an indication that the cardiac electrical signal is reliable; anddetermining a plurality of heart sounds in response to the heart sound signal independent of the cardiac electrical signal in response to an indication that the cardiac electrical signal is unreliable.2. The method of claim 1 , wherein determining an ensemble averaged heart sound signal comprises selecting an ensemble averaging interval in response to the cardiac electrical signal.3. The method of claim 1 , further comprising:determining a feature of the cardiac electrical signal corresponding to a cardiac cycle in response to an indication that the cardiac electrical signal is reliable; andselectively accepting or rejecting the cardiac cycle for inclusion in the ensemble averaged heart sound signal in response to the determined feature.4. The method of claim 3 , wherein the determined feature comprises a ...

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Номер записи: 17
12-09-2013 дата публикации

HEART SOUND SENSING TO REDUCE INAPPROPRIATE TACHYARRHYTHMIA THERAPY

Номер: US20130237873A1
Автор: Brown Mark L., DeGroot Paul J., Gilberg Jeffrey M., Whitman Teresa A., ZHANG Xusheng
Принадлежит:

A method and device for detecting a cardiac event that includes sensing cardiac electrical signals representative of electrical activity of a heart of a patient, detecting the cardiac event in response to the sensed cardiac signals, determining an indication of signal reliability corresponding to the sensed cardiac signals as being one of a reliable signal and a not reliable signal, and switching operation of the device between a first mode of determining whether the sensed signal is one of treatable and not treatable and a second mode of determining whether the sensed signal is one of treatable and not treatable in response to the determined indication of signal reliability. 1. A method for detecting cardiac events in a medical device , comprising:sensing cardiac electrical signals representative of electrical activity of a heart of a patient;detecting the cardiac event in response to the sensed cardiac signals;determining an indication of signal reliability corresponding to the sensed cardiac signals as being one of a reliable signal and a not reliable signal; andswitching operation of the device between a first mode of determining whether the sensed signal is one of treatable and not treatable and a second mode of determining whether the sensed signal is one of treatable and not treatable in response to the determined indication of signal reliability.2. The method of claim 1 , further comprising:sensing heart sounds and generating heart sounds signals representative of the sensed heart sound signals; andswitching to the first mode in response to the indication of signal reliability corresponding to the sensed signal being a reliable signal, wherein the first mode comprises determining an ensemble averaged heart sound signal dependent on the cardiac electrical signal.3. The method of claim 2 , further comprising switching to the second mode in response to the indication of signal reliability corresponding to the sensed signal being a not reliable signal claim 2 , ...

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Номер записи: 18
10-10-2013 дата публикации

Heart-sounds based adaptive cardiac resynchronization therapy timing parameter optimization system

Номер: US20130268017A1
Автор: Aleksandre T. Sambelashvili, Jeffrey M. Gillberg, Paul J. Degroot, Thomas J. Mullen, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A medical device and associated method for controlling a cardiac pacing therapy sense a first cardiac signal including events corresponding to cardiac electrical events and a second cardiac signal including events corresponding to cardiac hemodynamic events. A processor is enabled to measure a cardiac conduction time interval using the first cardiac signal and control a signal generator to deliver a pacing therapy. A pacing control parameter is adjusted to a plurality of settings during the pacing therapy delivery. A hemodynamic parameter value is measured from the second cardiac signal during application of each of the control parameter settings. The processor identifies an optimal setting from the plurality of settings and solves for a patient-specific equation defining the pacing control parameter as a function of the cardiac conduction time interval.

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Номер записи: 19
31-10-2013 дата публикации

HEART SOUND-BASED PACING VECTOR SELECTION SYSTEM AND METHOD

Номер: US20130289640A1
Автор: Gillberg Jeffrey M., ZHANG Xusheng
Принадлежит:

A system and method for generating a pacing vector selection table senses a heart sound signal generated by a heart sound sensor and representing sounds generated by the heart of the patient. A processor controls the sequential selection of a pacing electrode vectors from electrodes positioned along a heart chamber. Pacing pulses are delivered via the sequentially selected plurality of pacing electrode vectors. The processor receives the heart sound signal, determines a plurality of different pacing responses using the heart sound signal for each of the of pacing electrode vectors, and generates a pacing vector selection table listing the plurality of different pacing responses for each of the plurality of pacing electrode vectors. 1. A method for selecting a pacing therapy electrode vector , comprising:sensing a heart sound signal generated by a heart sound sensor and representing sounds generated by the heart of the patient;sequentially selecting a plurality of pacing electrode vectors from a plurality of electrodes positioned along a heart chamber;delivering pacing pulses via the sequentially selected plurality of pacing electrode vectors;enabling a processor to receive the heart sound signal, determine a plurality of different pacing responses in response to the heart sound signal for each of the plurality of pacing electrode vectors, and generate a table comprising the plurality of different pacing responses for each of the plurality of pacing electrode vectors.2. The method of claim 1 , further comprising:setting an extra-cardiac detection window extending between a pacing pulse and an expected myocardial response to the pacing pulse;detecting a change in the heart sound signal during the extra-cardiac detection window; anddetecting extra-cardiac stimulation in response to the heart sound signal change, wherein the plurality of different pacing responses comprises extra-cardiac stimulation detection.3. The method of claim 1 , further comprising:setting a ...

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Номер записи: 20
07-01-2016 дата публикации

METHOD AND APPARATUS FOR VERIFYING DISCRIMINATING OF TACHYCARDIA EVENTS IN A MEDICAL DEVICE HAVING DUAL SENSING VECTORS

Номер: US20160000350A1
Автор: ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, sensing a plurality of beats in response to the sensed cardiac signals, identifying each beat of the plurality of beats as one of a normal beat and a not normal beat, determining at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range, and identifying the cardiac event as being one of shockable and not shockable in response to the determining. 1. A method of detecting a cardiac event in a medical device , comprising:sensing cardiac signals from a plurality of electrodes;sensing a plurality of beats in response to the sensed cardiac signals;identifying each beat of the plurality of beats as one of a normal beat and a not normal beat;determining at least one of whether a number of beats identified as a normal beat is greater than a normal beat threshold, whether an RR interval associated with the beats identified as being a normal beat is less than a threshold interval, and whether RR intervals associated with the beats identified as being normal beats are within an RR interval range; andidentifying the cardiac event as being one of shockable and not shockable in response to the determining.2. The method of claim 1 , wherein the plurality of electrodes form a first sensing vector and a second sensing vector claim 1 , the method further comprising:performing a gross morphology analysis of a signal sensed along the first sensing vector during a predetermined sensing window and a signal sensed along the second sensing vector during the predetermined sensing window; andidentifying the cardiac event as being one of shockable and not shockable in response to the ...

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Номер записи: 21
13-01-2022 дата публикации

SENSOR-BASED PHRENIC NERVE STIMULATION DETECTION

Номер: US20220008733A1
Автор: Grenz Nathan A., KLECKNER Karen J., ZHANG Xusheng
Принадлежит:

A method and device for detecting phrenic nerve stimulation (PNS) in, or using, a cardiac medical device. A test signal sensitive to contraction of a diaphragm of a patient may be sensed and signal artifacts of the test signal within each of a first window of the test signal prior to a predetermined cardiac signal and a second window of the test signal subsequent to the predetermined cardiac signal may be determined. The PNS beat criteria may be evaluated, for example, using the test signal, which may be a heart sounds signal. 1sensing a test signal, the test signal being sensitive to contraction of a diaphragm of a patient;determining signal artifacts of the test signal within each of a first window of the test signal prior to a predetermined cardiac signal and a second window of the test signal subsequent to the predetermined cardiac signal;determining, in response to signal artifacts of the test signal within the first window and the second window, whether PNS beat criteria have been satisfied;determining, in response to the PNS beat criteria being satisfied, whether PNS episode criteria have been satisfied; anddetecting a PNS episode in response to the PNS episode criteria being satisfied.. A method of detecting phrenic nerve stimulation (PNS) in a cardiac medical device, comprising: This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/595,854 filed on Dec. 7, 2017, which is incorporated by reference in its entirety.A wide variety of implantable medical devices for delivering a therapy or monitoring a physiologic condition have been clinically implanted or proposed for clinical implantation in patients. In some cases, implantable medical devices (IMD) deliver electrical stimulation therapy and/or monitor physiological signals via one or more electrodes or sensor elements, which may be included as part of one or more elongated implantable medical leads. The implantable medical leads may be configured to allow one or more ...

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Номер записи: 22
03-01-2019 дата публикации

REAR GRILL ASSEMBLY FOR BOX FAN

Номер: US20190003489A1
Автор: Deng Meihua, GUO Runming, Liu Wellang, Yan Fengxi, ZHANG Xusheng
Принадлежит:

Disclosed is a rear grill assembly for a box fan including a rear grill, an electric motor support positioned on the rear grill by a positioning structure, and a frame arranged on the periphery of the rear grill by a snap structure. The frame includes a bottom cover, a top cover, and two side boards connected between the bottom cover and the top cover. The electric motor support is positioned on the rear grill by the positioning structure so that the electric motor support can be mounted easily and firmly. Thus, shortening the time for mounting the motor support, and improving the efficiency for mounting the rear grill assembly. Moreover, since the bottom cover, the top cover and the two side boards are assembled to form a frame, each part can be produced separately, whereby the difficulty in producing the frame is decreased to a certain extent. 1. A rear grill assembly for a box fan comprising:a rear grill;a positioning structure;a snap structure;an electric motor support located on the rear grill through the positioning structure; anda frame arranged at a peripheral edge of the rear grill through the snap structure, and comprising a bottom cover, a top cover and two lateral plates connected between the bottom cover and the top cover.2. The rear grill assembly for the box fan according to claim 1 , wherein the electric motor support comprises: a plurality of support bodies in a strip shape claim 1 , each support body is located with respect to the rear grill through the positioning structure.3. The rear grill assembly for the box fan according to claim 2 , wherein two support bodies are provided and arranged in parallel to each other claim 2 , each support body extends upwards to an upper edge of the rear grill and downwards to a lower edge of the rear grill claim 2 , an electric motor of the box fan is configured to be fixed between the two support bodies.4. The rear grill assembly for the box fan according to claim 2 , further comprising an electric motor ...

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Номер записи: 23
12-01-2017 дата публикации

METHOD AND APPARATUS FOR DETECTING ARRHYTHMIAS IN A SUBCUTANEOUS MEDICAL DEVICE

Номер: US20170007841A1
Автор: Ghanem Raja N., Stadler Robert W., ZHANG Xusheng
Принадлежит:

A method and system for use with an implantable medical device for subcutaneous implant within a patient to determine a likelihood of the patient experiencing a cardiac event that includes sensing a cardiac signal along a plurality of different sensing vectors, determining state information of each vector of the plurality of sensing vectors, determining a cross correlation of the determined state information of each vector of the plurality of sensing vectors, comparing the cross correlation of the determined state information of each vector of the plurality of sensing vectors to a threshold, and detecting the cardiac event in response to the comparing. 1. A method comprising:sensing, during each time period of a plurality of time periods, a first cardiac signal segment with a first sensing vector and a second cardiac signal segment with a second sensing vector;determining whether each of the first cardiac signal segments and the second cardiac signal segments is shockable or not shockable; anddetermining whether to deliver an anti-tachyarrhythmia shock to a patient based on a number of the first cardiac signal segments determined to be shockable and a number of the second cardiac signal segments determined to be shockable.2. The method of claim 1 , wherein determining whether each of the first cardiac signal segments and the second cardiac signal segments is shockable or not shockable comprises claim 1 , for each of the plurality of time periods claim 1 , one of:determining that both the first cardiac signal segment and the second cardiac signal segment are shockable;determining that both the first cardiac signal segment and the second cardiac signal segment are not shockable; ordetermining that only one of the first cardiac signal segment and the second cardiac signal segment is shockable, and the other of the first cardiac signal segment and the second cardiac signal segment sensing vector is not shockable.3. The method of claim 2 , further comprising determining ...

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Номер записи: 24
21-01-2021 дата публикации

SMALL-DIAMETER WIRE/ROD/TUBE ULTRASONIC DETECTION SYSTEM WITHOUT END BLIND AREA

Номер: US20210018472A1
Автор: HUA Haoran, LI Ying, LIAN Deliang, ZHANG Xusheng
Принадлежит:

The present invention aims at providing a small-diameter wire/rod/tube ultrasonic detector with an end blind area and an automatic ultrasonic nondestructive detecting system, wherein a sealing cover of the ultrasonic detector is located on a water storage device; an annular array unit mounting rack and a water pump are fixed in the water storage device, and an annular array detecting unit is connected to the annular array unit mounting rack; the water pump is connected to an input end of water circulation input and output; a sensor is mounted in one side of the sealing cover in which a detected material is allowed to enter; the annular array detecting unit comprises an outer ring part and an inner ring part, and the outer ring part and the inner ring part are connected into a whole by means of a wire inlet side end cover and a wire outlet side end cover; the outer ring part consists of an outer ring substrate and an outer ring arraying probe, and the inner ring part consists of an inner ring inner core and an inner ring inner core locking ring. The ultrasonic detector in the present invention has unique “acoustic eye” structure characteristics, changes the mode of ultrasonic waves entering the detected material, and can effectively eliminate the end detection blind area of the wire/rod/tube. 110-. (canceled)11. An ultrasonic detector , comprising:a water storage device;a sealing cover provided on the water storage device for sealing the water storage device;an annular array unit mounting rack;an annular array detecting unit; anda sensor mounted at an outside of the sealing cover for determining the positions of the head portion and the tail portion of the material to be detected, wherein the annular array unit mounting rack are fixed inside the water storage device and the annular array detecting unit is connected to the annular array unit mounting rack, wherein the annular array detecting unit comprises an outer ring and an inner ring, wherein the outer ring and ...

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Номер записи: 25
28-01-2016 дата публикации

RHYTHM DISCRIMINATOR WITH IMMUNITY TO BODY POSTURE

Номер: US20160022166A1
Автор: Stadler Robert W., ZHANG Xusheng
Принадлежит:

An implantable medical device system includes an implantable cardioverter defibrillator (ICD) for detecting and treating ventricular tachycardia (VT). The ICD includes a sensing module for sensing a cardiac signal from available cardiac signal sensing vectors. A control module generates morphology templates of the cardiac signals for multiple patient postures for each of the available sensing vectors and determines a set of posture-independent template features. An unknown cardiac rhythm is classified in response to comparing features of a cardiac signal received during the unknown rhythm to the set of posture-independent features. 1. A method performed by an implantable medical device , comprising:sensing a first cardiac signal during a known cardiac rhythm from each of a plurality of available sensing vectors,for each of the plurality of available sensing vectors, generating a plurality of morphology templates of the first cardiac signal for each of a plurality of patient postures;determining a set of template features from each of the plurality of morphology templates;for each of the plurality of available sensing vectors, comparing the set of template features from one of the plurality of morphology templates corresponding to one of the plurality of postures to each of the sets of template features from all of the other morphology templates corresponding to all of the other of the plurality of postures;for each of the plurality of available sensing vectors, storing a set of posture-independent template features in response to the comparing;sensing a second cardiac signal during an unknown cardiac rhythm from at least one of the plurality of available sensing vectors;determining features from the second cardiac signal that are analogous to the set of posture-independent template features stored for the at least one of the plurality of available sensing vectors;comparing the features determined from the second cardiac signal to the analogous set of posture- ...

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Номер записи: 26
28-01-2016 дата публикации

Method and apparatus for detecting and discriminating tachycardia in a subcutaneously implantable cardiac device

Номер: US20160022999A1
Автор: Jeffrey M. Gillberg, Robert W. Stadler, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A medical device and associated method for discriminating cardiac events includes sensing a cardiac signal spatially located across approximately a full duration of a predetermined sensing window. A match score is determined corresponding to the sensed cardiac signal. A beat feature of multiple beat features across less than the full duration of the sensing window is determined, the beat feature being selected from the multiple beat features in response to the match score. Cardiac event evidence is accumulated in response to the match score and the determined beat feature, and cardiac events are discriminated in response to the accumulated cardiac evidence.

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Номер записи: 27
28-01-2016 дата публикации

METHOD AND APPARATUS FOR ACCURATE SEPARATION OF SUPRAVENTRICULAR TACHYCARDIA FROM VENTRICULAR TACHYCARDIA DURING POSTURE CHANGES

Номер: US20160023013A1
Автор: Greenhut Saul E., Stadler Robert W., ZHANG Xusheng
Принадлежит:

An implantable medical device system includes an implantable cardioverter defibrillator (ICD) for detecting and treating ventricular tachycardia (VT). The ICD includes a sensing module for sensing a cardiac signal from selected cardiac signal sensing vectors. A control module generates morphology templates of the cardiac signals for multiple patient postures for each of the available sensing vectors. A cardiac signal received during an unknown cardiac rhythm is compared to the morphology templates without determining a current posture of the patient. The unknown cardiac rhythm is detected and classified as supraventricular tachycardia in response to the cardiac signal matching at least one of the morphology templates. 1. A method performed by an implantable medical device , comprising:sensing a first cardiac signal during a known cardiac rhythm from each of a plurality of available sensing vectors,generating, for each of the plurality of available sensing vectors, a plurality of morphology templates of the first cardiac signal for each of a plurality of patient postures;sensing a second cardiac signal during an unknown cardiac rhythm using one or more of the plurality of available sensing vectors;comparing the second cardiac signal to at least a portion of the plurality of morphology templates without determining a current posture of the patient; anddetecting the unknown cardiac rhythm as supraventricular tachycardia in response to the second cardiac signal matching at least one of the plurality of morphology templates.2. The method of claim 1 , further comprising:comparing the plurality of morphology templates generated for a given one of the plurality of available sensing vectors to each other; andin response to the comparing of the plurality of morphology templates to each other, reducing a number of the plurality of morphology templates that are stored for comparing to the second cardiac signal during the unknown rhythm from a total number of the plurality of ...

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Номер записи: 28
26-01-2017 дата публикации

METHOD FOR ESTABLISHING MAPPING RELATION IN STI ETCH AND CONTROLLING CRITICAL DIMENSION OF STI

Номер: US20170025304A1
Автор: Feng Qiyan, Lv Yukun, Ren Yu, Xu Jin, ZHANG Xusheng
Принадлежит:

The present invention provides a method for controlling a critical dimension of shallow trench isolations in a STI etch process, comprises the following steps: before the STI etch process, pre-establishing a mapping relation between a post-etch and pre-etch critical dimension difference of a BARC layer and a thickness of the BARC layer; and during the STI etch process after coating the BARC layer, measuring the thickness of the BARC layer and determining a trimming time for a hard mask layer according to a critical dimension difference corresponding to the measured thickness in the mapping relation and a critical dimension of a photoresist pattern, then performing a trimming process for the hard mask layer lasting the trimming time to make a critical dimension of the hard mask layer equal to a required critical dimension of an active area, and etching a substrate to form shallow trenches with a predetermined critical dimension. 1. A method for controlling a critical dimension of shallow trench isolations in a STI etch process , wherein the STI etch process comprises the steps of: forming a hard mask layer on a substrate in which active areas are formed , forming a bottom anti-reflective coating layer on the hard mask layer by spin coating , coating a photoresist on the bottom anti-reflective coating layer and patterning to form a photoresist pattern covering the active areas with a target critical dimension , etching the bottom anti-reflective coating layer and the hard mask layer by using the photoresist pattern as a mask according to an etch process recipe and then removing the photoresist pattern and the bottom anti-reflective coating layer , performing a trimming process to the hard mask layer to form a hard mask pattern having a required post-etch critical dimension which is equal to a critical dimension of the active areas , and etching the substrate by using the hard mask pattern as a mask to form the shallow trenches; the method comprises following two steps ...

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Номер записи: 29
01-02-2018 дата публикации

CARDIAC ELECTRICAL SIGNAL NOISE DETECTION FOR TACHYARRHYTHMIA EPISODE REJECTION

Номер: US20180028083A1
Автор: Cao Jian, Greenhut Saul E., ZHANG Xusheng
Принадлежит:

A medical device, such as an extra-cardiovascular implantable cardioverter defibrillator (ICD), senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal acquired by a second sensing channel in response to each sensed R-wave. The medical device determines at least one noise parameter from a group of the stored time segments of the second cardiac electrical signal, detects noise based on the noise parameter, and withholds detection of a tachyarrhythmia episode in response to detecting the noise. 1. A medical device system , comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first sensing electrode vector coupled to the medical device and to sense a plurality of R-waves in response to crossings of an R-wave amplitude threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second sensing electrode vector coupled to the medical device;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory in response to each one of the plurality of R-waves sensed by the first sensing channel;', 'select a group of the time segments of the second cardiac electrical signal;', 'determine at least a first noise parameter from the group of time segments;', 'detect noise in the group of time segments based on at least the first noise parameter; and', 'withhold detection of a tachyarrhythmia episode in response to detecting the noise., 'a control circuit coupled to the sensing circuit and the memory and configured to2. The system of claim 1 , wherein the control circuit is further configured to:determine a plurality of intervals between successive ones of the plurality of R-waves sensed by the first sensing channel; andselect the group of time segments for determining the first noise parameter in response to at ...

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Номер записи: 30
01-02-2018 дата публикации

CARDIAC ELECTRICAL SIGNAL GROSS MORPHOLOGY-BASED NOISE DETECTION FOR REJECTION OF VENTRICULAR TACHYARRHYTHMIA DETECTION

Номер: US20180028085A1
Автор: Cao Jian, Greenhut Saul E., ZHANG Xusheng
Принадлежит:

A medical device system, such as an extra-cardiovascular implantable cardioverter defibrillator ICD, senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The medical device system determines a morphology parameter correlated to signal noise from time segments of the second cardiac electrical signal, detects a noisy signal segment based on the signal morphology parameter; and withholds detection of a tachyarrhythmia episode in response to detecting a threshold number of noisy signal segments. 1. A medical device system comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first sensing electrode vector coupled to the medical device system and to sense R-waves in response to crossings of a sensing amplitude threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second sensing electrode vector coupled to the medical device system and different than the first sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory for each of the plurality of R-waves sensed by the first sensing channel;', determine a morphology parameter correlated to signal noise from the stored time segment; and', 'detect the stored time segment as being a noisy signal segment based on the morphology parameter determined for the respective stored time segment; and, 'for each of a plurality of the stored time segments,'}, 'withhold detection of a tachyarrhythmia episode in response to detecting at least a threshold number of the stored time segments as noisy signal segments., 'a control circuit coupled to the sensing circuit and the memory, the control circuit configured to2. The system of claim 1 , further comprising a notch filter claim 1 , wherein the time ...

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Номер записи: 31
01-02-2018 дата публикации

CARDIAC ELECTRICAL SIGNAL GROSS MORPHOLOGY-BASED NOISE DETECTION FOR REJECTION OF VENTRICULAR TACHYARRHYTHMIA DETECTION

Номер: US20180028087A1
Автор: Cao Jian, Greenhut Saul E., ZHANG Xusheng
Принадлежит:

A medical device system, such as an extra-cardiovascular implantable cardioverter defibrillator ICD, senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The medical device system determines a morphology parameter correlated to signal noise from time segments of the second cardiac electrical signal, detects a noisy signal segment based on the signal morphology parameter; and withholds detection of a tachyarrhythmia episode in response to detecting a threshold number of noisy signal segments. 1. A medical device system comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first sensing electrode vector coupled to the medical device system and to sense R-waves in response to crossings of a sensing amplitude threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second sensing electrode vector coupled to the medical device system and different than the first sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory for each of the plurality of R-waves sensed by the first sensing channel;', determine a morphology parameter correlated to signal noise from the stored time segment; and', 'detect the stored time segment as being a noisy signal segment based on the morphology parameter determined for the respective stored time segment; and, 'for each of a plurality of the stored time segments,'}, 'withhold detection of a tachyarrhythmia episode in response to detecting at least a threshold number of the stored time segments as noisy signal segments., 'a control circuit coupled to the sensing circuit and the memory, the control circuit configured to2. The system of claim 1 , further comprising a notch filter claim 1 , wherein the time ...

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Номер записи: 32
01-02-2018 дата публикации

CARDIAC ELECTRICAL SIGNAL MORPHOLOGY AND PATTERN-BASED T-WAVE OVERSENSING REJECTION

Номер: US20180028828A1
Автор: Cao Jian, Greenhut Saul E., ZHANG Xusheng
Принадлежит:

A medical device, such as an extra-cardiovascular implantable cardioverter defibrillator (ICD), senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal acquired by a second sensing channel in response to each sensed R-wave. The ICD determines morphology match scores from the stored time segments of the second cardiac electrical signal and, based on the morphology match scores, withholds detection of a tachyarrhythmia episode. In some examples, the ICD detects T-wave oversensing based on the morphology match scores and withholds detection of a tachyarrhythmia episode in response to detecting the T-wave oversensing. 1. A system including a medical device comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first sensing electrode vector coupled to the medical device and to sense a plurality of R-waves in response to crossings of a first amplitude threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second sensing electrode vector coupled to the medical device and different than the first sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory in response to each one of the plurality of R-waves sensed by the first sensing channel;', 'determine a morphology match score for each of a plurality of the time segments of the second cardiac electrical signal; and', 'withhold detection of a tachyarrhythmia episode based at least on the morphology match scores., 'a control circuit coupled to the sensing circuit and the memory and configured to2. The system of claim 1 , wherein the control circuit is further configured to:detect T-wave oversensing in the plurality of R-waves based on the morphology match scores; andwithhold detection of the tachyarrhythmia episode in ...

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Номер записи: 33
01-02-2018 дата публикации

SIMULATION METHOD OF CMP PROCESS

Номер: US20180032648A1
Автор: Cao Yun, Kan Huan, Lv Yukun, Wei Fang, ZHANG Xusheng, ZHU Jun
Принадлежит:

The invention disclosed a simulation method of CMP process, comprising: firstly, building a CMP model, and forming a matrix table of line width logarithm-density according to the CMP model, and making each intersection of the matrix table correspond to each CMP result under the corresponding line width and density; secondly, dividing a layout into a plurality of grids, and converting the equivalent line width and density of each grid into the coordinate of line width logarithm-density in the matrix table; thirdly, fitting and calculating preliminary CMP simulation results of each grid according to the coordinate of each grid in the matrix table and the CMP simulation results of its adjacent intersections of the matrix table; then, fitting and computing final CMP simulation results of each grid according to a related weighting factor which considers the impact of adjacent grids for the current grid on the layout; finally, outputting the final CMP simulation results of the whole layout. 1. A simulation method of CMP process , comprising the steps of:{'b': '01', 'Step S: building a CMP model, and forming a matrix table of line width logarithm-density according to the CMP model, and making each intersection of the matrix table correspond to each CMP result under the corresponding line width and density;'}{'b': '02', 'Step S: dividing a layout into a plurality of grids, and converting the equivalent line width and density of each grid into the coordinate of line width logarithm-density in the matrix table;'}{'b': '03', 'Step S: fitting and calculating preliminary CMP simulation results of each grid according to the coordinate of each grid in the matrix table and the CMP simulation results of its adjacent intersections of the matrix table;'}{'b': '04', 'Step S: fitting and calculating final CMP simulation results of each grid according to a related weighting factor, which considers the impact of adjacent grids for the current grid on the layout;'}{'b': '05', 'Step S: ...

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Номер записи: 34
01-02-2018 дата публикации

METHOD FOR FORMING SHALLOW TRENCHES OF THE DUAL ACTIVE REGIONS

Номер: US20180033810A1
Автор: Chen Minjie, JING Quan, Lv Yukun, Ren Yu, Xu Jin, ZHANG Xusheng, ZHU Jun
Принадлежит:

The invention disclosed a method for forming shallow trenches of the dual active regions. Firstly, forming an etch stop layer on a semiconductor substrate; secondly, using a first accurate photomask to expose and develop the semiconductor substrate, until the etch stop layer has been exposed on the top of the first shallow trench regions and the second shallow trench regions; thirdly, etching the etch stop layer entirely in the exposed regions; fourthly, using a second photomask to expose and develop the first shallow trench regions which require a deeper etch depth of the trench than that of the second shallow trench regions; fifthly, etching and forming preliminary entirely depth in the first shallow trench regions, and then removing the second photomask; at last, taking the etch stop layer as a mask, and simultaneously etching the first shallow trench regions and the second shallow trench regions to form the first hallow trenches and the second shallow trenches having different depths. The invention has realized a low-cost photomask application and an optimization of the etching process by optimizing the photomask design. 1. A method for forming shallow trenches of the dual active regions , comprising the steps of{'b': '01', 'Step S: providing a semiconductor substrate having first shallow trench regions and second shallow trench regions, on which forming an etch stop layer;'}{'b': '02', 'Step S: using a first accurate photomask to expose and develop a first photoresist covering the semiconductor substrate, until the etch stop layer has been exposed on the top of the first shallow trench regions and the second shallow trench regions;'}{'b': '03', 'Step S: etching the etch stop layer entirely in the exposed regions;'}{'b': '04', 'Step S: using a second low-cost photomask to expose and develop a second photoresist to expose the first shallow trench regions;'}{'b': '05', 'Step S: etching and forming the first shallow trenches with a preliminary depth in the first ...

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Номер записи: 35
21-02-2019 дата публикации

ANTI-TACHYCARDIA PACING CONTROL IN AN IMPLANTABLE MEDICAL DEVICE SYSTEM

Номер: US20190054297A1
Автор: EBELING Timothy A., GRINBERG Yanina, Jackson Troy E., Nikolski Vladimir P., Solheim Paul R., ZHANG Xusheng
Принадлежит:

An implantable medical device system is configured to detect a tachyarrhythmia from a cardiac electrical signal and start an ATP therapy delay period. The implantable medical device determines whether the cardiac electrical signal received during the ATP therapy delay period satisfies ATP delivery criteria. A therapy delivery module is controlled to cancel the delayed ATP therapy if the ATP delivery criteria are not met and deliver the delayed ATP therapy if the ATP delivery criteria are met. 1. An implantable medical device system comprising:a sensing module configured to receive a cardiac electrical signal from a patient's heart via a sensing electrode vector and sense cardiac events from the cardiac electrical signal;a therapy delivery module configured to generate pulses for delivering an anti-tachycardia pacing (ATP) therapy to the patient's heart via a pacing electrode vector; and detect a tachyarrhythmia from the cardiac electrical signal;', 'start an ATP therapy delay period to delay the ATP therapy in response to detecting the tachyarrhythmia;', 'determine whether ATP delivery criteria are satisfied based on the cardiac electrical signal received by the sensing module during the ATP therapy delay period;', 'control the therapy delivery module to deliver the delayed ATP therapy in response to the ATP delivery criteria being satisfied; and', 'cancel the delayed ATP therapy in response to the ATP delivery criteria not being satisfied., 'a control module coupled to the sensing module and the therapy delivery module and configured to2. The system of claim 1 , wherein the control module is configured to determine whether the ATP delivery criteria are satisfied by:determining sensed cardiac event intervals during the ATP therapy delay period, each sensed cardiac event interval being determined as a time interval between a pair of consecutively sensed cardiac events sensed by the sensing module;comparing the sensed cardiac event intervals determined during the ATP ...

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Номер записи: 36
08-03-2018 дата публикации

METHOD AND APPARATUS FOR DISCRIMINATING TACHYCARDIA EVENTS IN A MEDICAL DEVICE USING TWO SENSING VECTORS

Номер: US20180064949A1
Автор: ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes forming a first sensing vector sensing a first interval of the cardiac signal during a predetermined time period and a second sensing vector simultaneously sensing a second interval of the cardiac signal during the predetermined time period, identifying each of the first interval and the second interval as being one of shockable and not shockable in response to first processing of the first interval and the second interval and in response to second processing of one or both of the first interval and the second interval, the second processing being different from the first processing, and determining whether to deliver therapy for the cardiac event in response to identifying each of the first interval and the second interval as being one of shockable and not shockable in response to both the first processing and the second processing of the first interval and the second interval. 1. A method comprising:obtaining a first cardiac signal sensed on a first sensing vector formed between a first electrode and a second electrode;identifying a plurality of analysis windows, each of the plurality of analysis windows extending a predetermined amount of time and including a respective segment of the first cardiac signal having a plurality of R-wave sense events;analyzing, for each of the plurality of analysis windows, a gross morphology of the respective segment of the first cardiac signal across the entire analysis window;analyzing, for each of the plurality of analysis windows, a beat-based morphology of each individual one of the plurality of R-wave sense events of the respective segment of the first cardiac signal within the analysis window;classifying analysis windows of the plurality of analysis windows as shockable when both the gross morphology analysis associated with the respective analysis window results in a shockable classification and the ...

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Номер записи: 37
26-03-2020 дата публикации

MULTI-THRESHOLD SENSING OF CARDIAC ELECTRICAL SIGNALS IN AN EXTRACARDIOVASCULAR IMPLANTABLE CARDIOVERTER DEFIBRILLATOR

Номер: US20200094065A1
Автор: ARNE Gerald P., Cao Jian, EBELING Timothy A., Greenhut Saul E., HEINKS Michael W., SANCHEZ Irving J., Solheim Paul R., ZHANG Xusheng
Принадлежит:

An implantable medical device system capable of sensing cardiac electrical signals includes a sensing circuit, a therapy delivery circuit and a control circuit. The sensing circuit is configured to receive a cardiac electrical signal and sense a cardiac event in response to the signal crossing a cardiac event sensing threshold. The therapy delivery circuit is configured to deliver an electrical stimulation therapy to a patient's heart via the electrodes coupled to the implantable medical device. The control circuit is configured to control the sensing circuit to set a starting value of the cardiac event sensing threshold and hold the starting value constant for a sense delay interval. The control circuit is further configured to detect an arrhythmia based on cardiac events sensed by the sensing circuit and control the therapy delivery circuit to deliver the electrical stimulation therapy in response to detecting the arrhythmia. 1. A device comprising: receive a cardiac electrical signal; and', 'sense a cardiac event attendant to a myocardial depolarization in response to the cardiac electrical signal crossing a cardiac event sensing threshold;, 'a sensing circuit configured toa therapy delivery circuit configured to deliver an electrical stimulation therapy; and set the cardiac event sensing threshold to a starting value;', 'hold the cardiac event sensing threshold constant at the starting value for a sense delay interval;', 'adjust the cardiac event sensing threshold to a second threshold value upon expiration of the sense delay interval; and', 'hold the cardiac event sensing threshold constant at the second threshold value for a drop time interval., 'control the sensing circuit to, 'a control circuit configured to2. The device of claim 1 , wherein the control circuit is further configured to control the sensing circuit to adjust the cardiac event sensing threshold from the second threshold value to a minimum threshold value upon expiration of the drop time ...

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Номер записи: 38
28-04-2016 дата публикации

METHOD AND APPARATUS FOR SELECTION AND USE OF VIRTUAL SENSING VECTORS

Номер: US20160113536A1
Автор: Greenhut Saul E., Stadler Robert W., ZHANG Xusheng
Принадлежит:

A medical device is configured to receive at least two physical cardiac electrical signals from a patient's heart via electrodes defining at least two physical sensing vectors. The medical device determines a signal feature for each of a plurality of virtual sensing vectors extending at a plurality of angles relative to one of the at least two physical sensing vectors during a known cardiac rhythm, compares the determined signal features and establishes criteria for confirming a suspected condition in response to the comparing. 1. A method performed by a medical device , comprising:receiving at least two physical cardiac electrical signals from a patient's heart via a plurality of electrodes that define at least two physical sensing vectors;determining a plurality of virtual cardiac electrical signal features using the at least two physical cardiac electrical signals during a first, known cardiac rhythm, each of the plurality of virtual cardiac electrical signal features corresponding to one of a plurality of virtual sensing vectors extending at a respective one of a plurality of angles relative to one of the two physical sensing vectors;comparing the determined signal features;establishing criteria for confirming a suspected condition in response to the comparing;detecting a suspected condition during a second, unknown cardiac rhythm; andconfirming the suspected condition in response to the established criteria being met during the second, unknown cardiac rhythm.2. The method of claim 1 , wherein determining the plurality of virtual cardiac electrical signal features comprises computing the plurality of virtual cardiac electrical signals using the at least two physical cardiac electrical signals; anddetermining the plurality of virtual cardiac electrical signal features from the determined plurality of virtual cardiac electrical signals.3. The method of claim 1 , wherein:establishing the criteria for confirming the suspected condition comprises determining one of ...

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Номер записи: 39
30-04-2015 дата публикации

AUTOMATED PHRENIC NERVE STIMULATION AND PACING CAPTURE THRESHOLD TEST

Номер: US20150119950A1
Автор: Demmer Wade M, Sheldon Todd J, Stadler Robert W, ZHANG Xusheng
Принадлежит:

A medical device system performs a method for determining pacing threshold data. Signals are received from a cardiac capture sensor and a phrenic nerve stimulation sensor. A cardiac capture threshold is determined from the cardiac capture sensor signal and a phrenic nerve stimulation threshold is determined from the phrenic nerve stimulation sensor signal for multiple pacing electrode vectors. 1. An automated method for determining pacing threshold data , comprising:receiving a signal from a cardiac capture sensor;receiving a signal from a phrenic nerve stimulation sensor; delivering a stimulation pulse via a selected one of the plurality of pacing electrode vectors using a first pacing pulse output;', 'detecting from the phrenic nerve stimulation sensor signal whether phrenic nerve stimulation occurs in response to the first pacing pulse output;', 'adjusting the stimulation pulse by a first step to a second pacing pulse output in response to detecting the phrenic nerve stimulation;', 'detecting from the cardiac capture sensor signal whether cardiac capture occurs in response to the second pacing pulse output; and', 'adjusting the stimulation pulse output by a second step to a third pacing pulse output in response to detecting cardiac capture, the second step being less than the first step., 'determining a cardiac capture threshold from the cardiac capture sensor signal while detecting phrenic nerve stimulation from the phrenic nerve stimulation sensor signal for each of a plurality of pacing electrode vectors, the determining comprising2. The method of claim 1 , further comprising:delivering a first number of pulses at the first pacing pulse output;analyzing the phrenic nerve stimulation sensor signal for each of the first number of pulses for detecting the phrenic nerve stimulation; andanalyzing the cardiac capture sensor signal for less than the first number of pulses for detecting cardiac capture at the first pacing pulse output.3. The method of claim 1 , ...

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Номер записи: 40
18-04-2019 дата публикации

IMPEDANCE SENSING

Номер: US20190111268A1
Автор: Christie Melissa G.T., Drake Ronald A., Nikolski Vladimir P., PURUSHOTHAMAN Bushan K., ZHANG Xusheng
Принадлежит:

In some examples, a medical device system includes an electrode. The medical device system may include impedance measurement circuitry coupled to the electrode, the impedance measurement circuitry may be configured to generate an impedance signal indicating impedance proximate to the electrode. The medical device system may include processing circuitry that may be configured to identify a first component of the impedance signal. The first component of the impedance signal may be correlated to a cardiac event. The processing circuitry may be configured to determine that the cardiac event occurred based on the identification of the first component of the impedance signal. 1. A medical device system comprising:an electrode;impedance measurement circuitry coupled to the electrode, the impedance measurement circuitry configured to generate an impedance signal indicating impedance proximate to the electrode;therapeutic signal generation circuitry configured to generate and deliver an electrical stimulation; and identify a plurality of cardiac events within the impedance signal;', 'detect a cardiac arrhythmia based on the plurality of identified cardiac events within the impedance signal;', 'control the therapeutic signal generation circuitry to generate the electrical stimulation therapy in response to detection of the cardiac arrhythmia., 'processing circuitry configured to2. The medical device system of claim 1 , wherein the processor is further configured to:determine one or more of a rate of the identified plurality of cardiac events, a regularity of the identified plurality of cardiac events, or a morphology of the identified plurality of cardiac events; anddetect the cardiac arrhythmia based on at least one of the rate, the regularity, or the morphology of the identified plurality of cardiac events.3. The medical device system of claim 1 , wherein the processor is configured to:detect a change in at least one of an amplitude or a slope in the impedance signal that ...

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Номер записи: 41
13-05-2021 дата публикации

MEDICAL DEVICE AND METHOD FOR TACHYARRYTHMIA DETECTION

Номер: US20210138243A1
Автор: Dehmer Kevin L., Greenhut Saul, Jackson Troy E., Liu Yuanzhen, ZHANG Xusheng
Принадлежит:

A medical device is configured to determine time intervals between consecutive cardiac events sensed from a cardiac electrical signal, increase a value of a tachyarrhythmia interval count in response to each of the determine time intervals detected as a tachyarrhythmia interval. The device is further configured to detect normal sinus rhythm events and the decrease the value of the tachyarrhythmia interval count in response to a threshold number of detected normal sinus rhythm events. 1. A medical device comprising: receive a first cardiac electrical signal;', 'sense cardiac events from the first cardiac electrical signal;, 'a cardiac electrical signal sensing circuit configured to determine time intervals between consecutive cardiac events sensed from the first cardiac electrical signal;', 'detect a plurality of tachyarrhythmia intervals from the determined time intervals, each of the plurality of tachyarrhythmia intervals being less than a tachyarrhythmia detection interval threshold;', 'increase a value of a tachyarrhythmia interval count in response to detecting each of the plurality of tachyarrhythmia intervals;', 'detect a normal sinus rhythm interval from the determined time intervals, the normal sinus rhythm interval being greater than a normal sinus rhythm interval threshold;', 'determine that a first reset threshold number of normal sinus rhythm intervals are detected;', 'decrease the value of the tachyarrhythmia interval count in response to the first reset threshold number of normal sinus rhythm intervals being detected; and', 'after decreasing the value of the tachyarrhythmia interval count, determine that the tachyarrhythmia interval count subsequently reaches a tachyarrhythmia detection threshold; and', 'detect a tachyarrhythmia in response to the value of the tachyarrhythmia interval count reaching the tachyarrhythmia detection threshold; and, 'a control circuit configured toa therapy delivery circuit configured to deliver a tachyarrhythmia therapy in ...

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Номер записи: 42
05-05-2016 дата публикации

Gravity Locking Mechanism

Номер: US20160121477A1
Автор: Xusheng Zhang
Принадлежит: ROBERT BOSCH GMBH, Robert Bosch Tool Corp

A gravity locking system includes a mounting structure and an article which includes an alignment structure, gravity load structure, and locking structure. The alignment structure is fixed to the article and aligns the article with the mounting structure. The gravity load structure is movable on the article and biased toward an unrestrained position. As the article moves toward the mounting structure, the gravity load structure moves away from the unrestrained position. The locking structure is movable on the article such that movement of the gravity load structure away from and toward the unrestrained position corresponds with movement of the locking structure toward and away from a closed position respectively. When weight of the article is supported by the gravity load structure on the mounting structure, the locking structure is urged against the mounting structure to lock the locking mechanism.

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Номер записи: 43
25-04-2019 дата публикации

IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR (ICD) TACHYARRHYTHMIA DETECTION MODIFICATIONS RESPONSIVE TO DETECTED PACING

Номер: US20190117104A1
Автор: Reinke James D., Schmid Barbara J., Sharma Vinod, Stadler Robert W., ZHANG Xusheng
Принадлежит:

An implantable medical device comprises a sensing module configured to obtain electrical signals from one or more electrodes and a control module configured to process the electrical signals from the sensing module in accordance with a tachyarrhythmia detection algorithm to monitor for a tachyarrhythmia. The control module detects initiation of a pacing train delivered by a second implantable medical device, determines a type of the detected pacing train, and modifies the tachyarrhythmia detection algorithm based on the type of the detected pacing train. 1. A method comprising:detecting, with an extravascular implantable medical device (IMD), initiation of a pacing train delivered by a second implantable medical device;determining a type of the detected pacing train; andmodifying a tachyarrhythmia detection algorithm based on the type of the detected pacing train.2. The method of claim 1 , wherein determining a type of the detected pacing train comprises:estimating a cycle length of the pacing train;comparing the estimated cycle length of the pacing train to at least one cycle length threshold; anddetermining a type of the detected pacing train based on the comparison.3. The method of claim 1 , wherein determining a type of the detected pacing train comprises analyzing one or more of an onset of the heart rate immediately prior to the detected pacing train claim 1 , a regularity of the pacing pulse intervals claim 1 , a consistency of the pacing artifact amplitude claim 1 , a consistency of the pacing pulse slew rate claim 1 , and/or a consistency of the pacing pulse polarity.4. The method of claim 1 , further comprising:obtaining an electrical signal sensed on an implantable electrical lead coupled to the IMD; andanalyzing at least one of an amplitude and a slew rate of the electrical signal to detect pacing pulses in the electrical signal, wherein detecting initiation of the pacing train comprises detecting initiation of the pacing train using the detected pacing ...

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Номер записи: 44
25-04-2019 дата публикации

Multi-threshold sensing of cardiac electrical signals in an implantable medical device

Номер: US20190117985A1
Автор: Gerald P. Arne, Jian Cao, Michael W. Heinks, Paul R. Solheim, Timothy A. EBELING, Xusheng Zhang, Yanina GRINBERG
Принадлежит: MEDTRONIC INC

An implantable medical device system is configured to sense cardiac events in response to a cardiac electrical signal crossing a cardiac event sensing threshold. A control circuit is configured to determine a drop time interval based on a heart rate and control a sensing circuit to hold the cardiac event sensing threshold at a threshold value during the drop time interval.

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Номер записи: 45
16-04-2020 дата публикации

Method and apparatus for discriminating tachycardia events in a medical device using two sensing vectors

Номер: US20200114157A1
Автор: Xusheng Zhang
Принадлежит: MEDTRONIC INC

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes forming a first sensing vector sensing a first interval of the cardiac signal during a predetermined time period and a second sensing vector simultaneously sensing a second interval of the cardiac signal during the predetermined time period, identifying each of the first interval and the second interval as being one of shockable and not shockable in response to first processing of the first interval and the second interval and in response to second processing of one or both of the first interval and the second interval, the second processing being different from the first processing, and determining whether to deliver therapy for the cardiac event in response to identifying each of the first interval and the second interval as being one of shockable and not shockable in response to both the first processing and the second processing of the first interval and the second interval.

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Номер записи: 46
16-04-2020 дата публикации

SYSTEM AND METHOD FOR SENSING AND DETECTION IN AN EXTRA-CARDIOVASCULAR IMPLANTABLE CARDIOVERTER DEFIBRILLATOR

Номер: US20200114158A1
Автор: CAO Jian L., Greenhut Saul E., Stadler Robert W., ZHANG Xusheng
Принадлежит:

An extra-cardiovascular implantable cardioverter defibrillator senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The ICD determines intervals between successively sensed R-waves and, in response to at least a predetermined number of the intervals being less than a tachyarrhythmia detection interval, analyzes at least a portion of the time segment of the second cardiac electrical signal corresponding to a most recent one of the sensed R-waves to confirm the most recent one of the R-waves. The ICD updates an unconfirmed beat count in response to the most recent one of the R-waves not being confirmed and withholds detection of a tachyarrhythmia episode in response to the unconfirmed beat count being equal to or greater than a rejection threshold. 1. An extra-cardiovascular implantable cardioverter defibrillator (ICD) , comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first extra-cardiovascular sensing electrode vector coupled to the extra-cardiovascular ICD and to sense a first plurality of R-waves in response to crossings of a first R-wave sensing threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second extra-cardiovascular sensing electrode vector coupled to the extra-cardiovascular ICD and different than the first extra-cardiovascular sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory in response to each one of the first plurality of R-waves sensed by the first sensing channel;', 'determine a first plurality of intervals between successive ones of the first plurality of R-waves sensed by the first sensing channel;', 'in response to at least a first predetermined number of the first plurality of intervals ...

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Номер записи: 47
23-04-2020 дата публикации

RHYTHM DISCRIMINATOR WITH IMMUNITY TO BODY POSTURE

Номер: US20200121212A1
Автор: Stadler Robert W., ZHANG Xusheng
Принадлежит:

A medical device system includes a cardioverter-defibrillator for detecting and treating ventricular tachycardia (VT). The medical device system includes a sensing module for sensing a cardiac signal from available cardiac signal sensing vectors. A control module generates morphology templates of the cardiac signals for multiple patient postures for each of the available sensing vectors and determines a set of posture-independent template features. An unknown cardiac rhythm is classified in response to comparing features of a cardiac signal received during the unknown rhythm to the set of posture-independent features. 1. A medical device comprising:a sensing module coupled to a plurality of electrodes defining a plurality of available sensing vectors, the sensing module receiving cardiac signals using selected ones of the available sensing vectors; and sense a first cardiac signal during a known cardiac rhythm from each of the plurality of available sensing vectors;', 'for each of the plurality of available sensing vectors, generate a plurality of morphology templates of the first cardiac signal for each of a plurality of patient postures;', 'determine a set of template features from each of the plurality of morphology templates;', 'for each of the plurality of available sensing vectors, compare the set of template features from one of the plurality of morphology templates corresponding to one of the plurality of postures to each of the sets of template features from all of the other morphology templates corresponding to all of the other of the plurality of postures;', 'for each of the plurality of available sensing vectors, store a set of posture-independent template features in response to the comparing;', 'sense a second cardiac signal during an unknown cardiac rhythm from at least one of the plurality of available sensing vectors;', 'determine features from the second cardiac signal that are analogous to the set of posture-independent template features stored ...

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Номер записи: 48
31-07-2014 дата публикации

SYSTEMS AND METHODS FOR LEADLESS PACING AND SHOCK THERAPY

Номер: US20140214104A1
Автор: Demmer Wade M, Greenhut Saul E, Jackson Troy E, Nehls Robert J, Olson Walter H, Reinke James D, ZHANG Xusheng
Принадлежит:

Techniques and systems for monitoring cardiac arrhythmias and delivering electrical stimulation therapy using a subcutaneous implantable cardioverter defibrillator (SICD) and a leadless pacing device (LPD) are described. For example, the SICD may detect a tachyarrhythmia within a first electrical signal from a heart and determine, based on the tachyarrhythmia, to deliver anti-tachyarrhythmia shock therapy to the patient to treat the detected arrhythmia. The LPD may receive communication from the SICD requesting the LPD deliver anti-tachycardia pacing to the heart and determine, based on a second electrical signal from the heart sensed by the LPD, whether to deliver anti-tachycardia pacing (ATP) to the heart. In this manner, the SICD and LPD may communicate to coordinate ATP and/or cardioversion/defibrillation therapy. In another example, the LPD may be configured to deliver post-shock pacing after detecting delivery of anti-tachyarrhythmia shock therapy. 1. A method comprising:determining, by a subcutaneous implantable cardioverter defibrillator (SICD) and based on a detected tachyarrhythmia, to deliver anti-tachyarrhythmia therapy to a patient to treat the detected arrhythmia;receiving, by a pacing device (PD) implanted within the heart of the patient, communication from the SICD requesting the PD deliver anti-tachyarrhythmia therapy to the patient;determining, by the PD, not to deliver anti-tachyarrhythmia therapy to the patient;wherein the method further comprises, in response to the determining not to deliver anti-tachyarrhythmia therapy, transmitting, by the LPD to the SICD, communication identifying the determination not to deliver anti-tachyarrhythmia therapy;receiving, by the SICD, the communication identifying the determination not to deliver anti-tachyarrhythmia therapy; andoverturning, based on the received communication identifying the determination not to deliver anti-tachycardia pacing, the determination of the SICD to deliver anti-tachyarrhythmia ...

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Номер записи: 49
10-06-2021 дата публикации

METHOD AND APPARATUS FOR DETECTING CARDIAC EVENT OVERSENSING

Номер: US20210170170A1
Автор: Greenhut Saul E., Liu Yuanzhen, Mischler Gavin M., ZHANG Xusheng
Принадлежит:

A medical device is configured to detect an alternating pattern of signal features determined from consecutive segments of a cardiac electrical signal and determine a gross morphology metric from at least one segment of the cardiac electrical signal. The device is configured to detect cardiac event oversensing in response to detecting the alternating pattern and the gross morphology metric not meeting tachyarrhythmia morphology criteria. The medical device may withhold detecting an arrhythmia in response to detecting the cardiac event oversensing. 1. A medical device comprising: sense at least one cardiac electrical signal;', 'detect cardiac events from the at least one cardiac electrical signal;, 'a cardiac electrical signal sensing circuit configured to in response to each one of a plurality of cardiac events detected from the at least one cardiac electrical signal, determine a signal feature from a segment of the at least one cardiac electrical signal;', 'detect an alternating pattern of the signal feature determined from consecutive segments of the at least one cardiac electrical signal;', 'determine a gross morphology metric from each of at least one segment of the consecutive segments;', 'determine that the gross morphology metric does not meet a tachyarrhythmia morphology criteria;', 'detect cardiac event oversensing in response to the gross morphology metric not meeting the tachyarrhythmia morphology criteria and detecting the alternating pattern; and', 'withhold detection of an arrhythmia in response to detecting the cardiac event oversensing., 'a control circuit configured to2. The medical device of claim 1 , wherein the control circuit is further configured to:in response to detecting the alternating pattern, identify at least one segment of the at least one cardiac electrical signal corresponding to a suspected true sensed cardiac event based on the alternating pattern; anddetermine the gross morphology metric from the at least one segment corresponding ...

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Номер записи: 50
14-05-2020 дата публикации

PLUG ASSEMBLY, COMPRESSOR STARTER AND COMPRESSOR ASSEMBLY

Номер: US20200149574A1
Автор: HU Huijun, ZHANG Xusheng
Принадлежит: ANHUI MEIZHI COMPRESSOR CO., LTD.

A plug assembly, a compressor starter and a compressor assembly are provided. The plug assembly includes a plug body defining at least one mounting through hole therein and a connecting post passing through the mounting through hole. Each connecting post has a first end located in the mounting through hole to be configured for plug-in connection with a terminal of the compressor, and a second end extending beyond the mounting through hole to be configured for connection with a control board. 1. A plug assembly comprising:a plug body defining at least one mounting through hole extending through the plug body; andat least one connecting post passing through the mounting through hole, the connecting post having a first end located in the mounting through hole to be configured for plug-in connection with a terminal of the compressor, and a second end extending beyond the mounting through hole to be configured for connection with a control board.2. The plug assembly according to claim 1 , wherein the at least one mounting through hole comprises three mounting through holes arranged in a triangle.3. The plug assembly according to claim 2 , wherein:the plug body comprises three mounting portions spaced apart from one another and arranged in parallel in an axial direction;each of the mounting portions defines one of the mounting through holes through in the axial direction of the mounting portion, and the three mounting portions are connected by three first connection plates and three second connection plates;first ends of the three first connection plates are connected and coincide with an incenter of a triangle formed by the connection lines of the centers of the three mounting portions, and a second end of each of the three first connection plates is connected with an outer peripheral wall of the corresponding mounting portion;two adjacent mounting portions are connected by the second connection plate, and the three first connection plates are located at an inner side of ...

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Номер записи: 51
01-07-2021 дата публикации

CARDIAC ELECTRICAL SIGNAL MORPHOLOGY AND PATTERN-BASED T-WAVE OVERSENSING REJECTION

Номер: US20210196966A1
Автор: Cao Jian, Greenhut Saul E., ZHANG Xusheng
Принадлежит:

A medical device, such as an extra-cardiovascular implantable cardioverter defibrillator (ICD), senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal acquired by a second sensing channel in response to each sensed R-wave. The ICD determines morphology match scores from the stored time segments of the second cardiac electrical signal and, based on the morphology match scores, withholds detection of a tachyarrhythmia episode. In some examples, the ICD detects T-wave oversensing based on the morphology match scores and withholds detection of a tachyarrhythmia episode in response to detecting the T-wave oversensing. 1. A medical device comprising:a sensing circuit configured to sense a cardiac electrical signal; determine a morphology match score for each of a plurality of time segments of the sensed cardiac electrical signal;', 'compare each of the morphology match scores to a first R-wave match score threshold;', 'compare at least a first portion of the morphology match scores to a second R-wave match score threshold less than the first R-wave match score threshold;', 'determine that the first portion of the morphology match scores are greater than the second R-wave match score threshold; and', 'detect T-wave oversensing at least in response to the first portion of the morphology match scores being greater than the second R-wave match score threshold., 'a control circuit configured to2. The medical device of claim 1 , wherein the control circuit is configured to:determine that a second portion of the morphology match scores are less than a third match score threshold, the third match score threshold being less than the second R-wave match score threshold; anddetect the T-wave oversensing at least in response to the first portion of the morphology match scores being greater than the second R-wave match score threshold and the second portion of the morphology match scores being ...

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Номер записи: 52
01-07-2021 дата публикации

FAN

Номер: US20210199119A1
Автор: CUI Shiqiang, Fang Yu, GUO Runming, KANG Ruixiang, WU YongQiang, Yl Rong, ZHANG Xusheng
Принадлежит:

Disclosed is a fan. The fan includes a support, a first motor, a first blade, a second motor, a second blade and an electronic control board. The first motor and the second motor are both installed on the support. The first motor is coaxial with the second motor. The first motor has a first rotation shaft and the second motor has a second rotation shaft. The first blade is installed on the first rotation shaft. The second blade is installed on the second rotation shaft. A torsion direction of the first blade is opposite to a torsion direction of the second blade. The electric control board is electrically connected to the first motor and the second motor, and includes a speed ratio adjustment device. The fan can provide a variety of air outlet modes and can quickly adjust between different air outlet modes. 2. The fan of claim 1 , wherein the electronic control board further includes a steering adjustment device configured to synchronously switch rotation directions of the first motor and the second motor.3. The fan of claim 2 , wherein the steering adjustment device includes a protection switch to cut off the steering adjustment device when the first motor and the second motor are working.4. The fan of claim 2 , wherein the electronic control board further includes a gear adjustment device claim 2 , and the gear adjustment device includes an editor for editing a gear claim 2 , a memory claim 2 , a plurality of preset gear selection keys and at least one custom gear selection key.11. The fan of claim 1 , further including a third blade installed on the first rotation shaft.12. The fan of claim 11 , wherein the third blade is provided outside the first blade claim 11 , and a length of the third blade is less than a length of the first blade.13. The fan of claim 11 , further including a fourth blade installed on the second rotation shaft.14. The fan of claim 13 , wherein the fourth blade is provided between the first blade and the second blade claim 13 , and a length ...

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Номер записи: 53
28-06-2018 дата публикации

RHYTHM DISCRIMINATOR WITH IMMUNITY TO BODY POSTURE

Номер: US20180177425A1
Автор: Stadler Robert W., ZHANG Xusheng
Принадлежит:

A medical device system includes a cardioverter-defibrillator for detecting and treating ventricular tachycardia (VT). The medical device system includes a sensing module for sensing a cardiac signal from available cardiac signal sensing vectors. A control module generates morphology templates of the cardiac signals for multiple patient postures for each of the available sensing vectors and determines a set of posture-independent template features. An unknown cardiac rhythm is classified in response to comparing features of a cardiac signal received during the unknown rhythm to the set of posture-independent features. 1. A medical device comprising:a sensing module coupled to a plurality of electrodes defining a plurality of available sensing vectors, the sensing module receiving cardiac signals using selected ones of the available sensing vectors; and sense a first cardiac signal during a known cardiac rhythm from each of the plurality of available sensing vectors;', 'for each of the plurality of available sensing vectors, generate a plurality of morphology templates of the first cardiac signal for each of a plurality of patient postures;', 'determine a set of template features from each of the plurality of morphology templates;', 'for each of the plurality of available sensing vectors, compare the set of template features from one of the plurality of morphology templates corresponding to one of the plurality of postures to each of the sets of template features from all of the other morphology templates corresponding to all of the other of the plurality of postures;', 'for each of the plurality of available sensing vectors, store a set of posture independent template features in response to the comparing;', 'sense a second cardiac signal during an unknown cardiac rhythm from at least one of the plurality of available sensing vectors;', 'determine features from the second cardiac signal that are analogous to the set of posture-independent template features stored ...

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Номер записи: 54
28-05-2020 дата публикации

STATOR CORE OF MOTOR

Номер: US20200169128A1
Автор: DENG Chuan, DU Guohua, GONG Joy, YUAN Yigang, ZHANG Xusheng
Принадлежит: FORD GLOBAL TECHNOLOGIES, LLC

A stator core for an electric motor may include a main body part formed by a plurality of stacked electromagnetic steel sheets, the main body part being provided with at least a first through hole extending axially with a first pin located in the first through hole. A first end cover is located at a first end of the main body part and connected to a first pin end of the first pin. A second end cover is located at a second end of the main body part and connected to a second pin end of the first pin. The connections of the first end cover and the second end cover to the first pin generate tensile stresses in the main body part to reduce core losses. 1. A stator core , comprising:a main body part formed by a plurality of stacked electromagnetic steel sheets, the main body part being provided with at least a first through hole extending axially;a first pin located in the first through hole;a first end cover located at a first end of the main body part and connected to a first pin end of the first pin; anda second end cover located at a second end of the main body part and connected to a second pin end of the first pin, wherein connections of the first end cover and the second end cover to the first pin generate tensile stresses in the main body part.2. The stator core according to claim 1 , wherein the first through hole has a first inner surface closer to a central axis of the stator core than a second inner surface claim 1 , the first pin is spaced apart from the first inner surface claim 1 , and wherein the first pin contacts the second inner surface and generates a thrust force against the first inner surface.3. The stator core according to claim 2 , wherein the first pin end of the first pin is connected to the first end cover by means of an interference fit claim 2 , and wherein the second pin end of the first pin is integrated with the second end cover.4. The stator core according to claim 1 , wherein the first pin end of the first pin is connected to the first ...

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Номер записи: 55
13-06-2019 дата публикации

SENSOR-BASED PHRENIC NERVE STIMULATION DETECTION

Номер: US20190175918A1
Автор: Grenz Nathan A., KLECKNER Karen J., ZHANG Xusheng
Принадлежит:

A method and device for detecting phrenic nerve stimulation (PNS) in, or using, a cardiac medical device. A test signal sensitive to contraction of a diaphragm of a patient may be sensed and signal artifacts of the test signal within each of a first window of the test signal prior to a predetermined cardiac signal and a second window of the test signal subsequent to the predetermined cardiac signal may be determined. The PNS beat criteria may be evaluated, for example, using the test signal, which may be a heart sounds signal. 1. A method of detecting phrenic nerve stimulation (PNS) in a cardiac medical device , comprising:sensing a test signal, the test signal being sensitive to contraction of a diaphragm of a patient;determining signal artifacts of the test signal within each of a first window of the test signal prior to a predetermined cardiac signal and a second window of the test signal subsequent to the predetermined cardiac signal;determining, in response to signal artifacts of the test signal within the first window and the second window, whether PNS beat criteria have been satisfied;determining, in response to the PNS beat criteria being satisfied, whether PNS episode criteria have been satisfied; anddetecting a PNS episode in response to the PNS episode criteria being satisfied.2. The method of claim 1 , wherein the test signal comprises one of an acoustic signal and an accelerometer signal.3. The method of claim 1 , wherein the predetermined cardiac signal comprises at least one of a ventricular pace (Vp) beat claim 1 , an atrial sense (As) beat claim 1 , and an atrial pace (Ap) beat.4. The method of claim 1 , wherein the test signal comprises a heart sounds signal claim 1 , and wherein determining whether PNS beat criteria have been satisfied comprises:determining whether a maximum of the absolute value of the heart sounds signal (|FHS|) within the second window is satisfied;determining whether a sum of the |FHS| within the second window is satisfied; ...

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Номер записи: 56
04-06-2020 дата публикации

SUPRAVENTRICULAR TACHYARRHYTHMIA DISCRIMINATION

Номер: US20200170532A1
Автор: Cao Jian, Liu Yuanzhen, ZHANG Xusheng
Принадлежит:

An implantable cardioverter defibrillator (ICD) performs a method that includes determining whether first criteria for detecting a ventricular tachyarrhythmia are met by a cardiac electrical signal. The ICD determines features from cardiac signal segment of a group of cardiac signal segments and determines whether a first portion of the features satisfy monomorphic waveform criteria and determines whether a second portion of the features satisfy supraventricular beat criteria. The ICD determines whether second criteria for detecting the ventricular tachyarrhythmia are met and withholds detecting of the ventricular tachyarrhythmia in response to the monomorphic waveform criteria and the supraventricular beat criteria being met. 1. A device comprising:a therapy delivery circuit configured to generate an electrical stimulation therapy for delivery to a patient's heart;a sensing circuit configured to receive at least a first cardiac electrical signal via a sensing electrode vector; and determine whether first criteria for detecting a ventricular tachyarrhythmia are met by the first cardiac electrical signal;', 'determine a plurality of features from each one of a plurality of cardiac signal segments of the first cardiac electrical signal;', 'in response to the first criteria being met, determine whether a first portion of the plurality of features determined from each one of the plurality of cardiac signal segments satisfy monomorphic waveform criteria;', 'determine whether a second portion of the plurality of features determined from each one of the plurality of cardiac signal segments satisfy supraventricular beat criteria;', 'determine whether second criteria for detecting the ventricular tachyarrhythmia are met;', 'withhold detecting of the ventricular tachyarrhythmia in response to both the monomorphic waveform criteria and the supraventricular beat criteria being satisfied; and', 'detect the ventricular tachyarrhythmia and controlling the therapy delivery circuit ...

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Номер записи: 57
18-09-2014 дата публикации

BEAT-MORPHOLOGY MATCHING SCHEME FOR CARDIAC SENSING AND EVENT DETECTION

Номер: US20140276155A1
Автор: ZHANG Xusheng
Принадлежит: Medtronic, Inc.

A medical device and associated method for classifying an unknown cardiac signal that includes sensing a cardiac signal over a plurality of cardiac cycles, determining a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles, sensing an unknown cardiac signal over an unknown cardiac cycle, determining a fourth order difference signal, determining a template alignment point and an unknown cardiac signal alignment point in response to the fourth order difference signal; 1. A method for classifying cardiac beats for use in detecting cardiac rhythms , comprising:sensing a cardiac signal over a plurality of cardiac cycles;determining a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles;sensing an unknown cardiac signal over an unknown cardiac cycle;determining a fourth order difference signal;determining an R-wave onset and an R-wave offset in response to the fourth order difference signal of the unknown cardiac cycle signal;determining an R-wave width as the difference between the R-wave onset and the R-wave offset;determining a morphology analysis window in response to the R-wave width; anddetermining a first morphology match metric across the morphology analysis window.2. The method of claim 1 , wherein the morphology analysis window comprises a first number of sample points of the unknown cardiac signal claim 1 , and the alignment window comprises a second number of sample points of the unknown cardiac signal claim 1 , the second number greater than the first number.3. The method of claim 1 , further comprising:determining a template alignment point and an unknown cardiac signal alignment point in response to the fourth order difference signal;aligning the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point; anddetermining the first morphology ...

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Номер записи: 58
18-09-2014 дата публикации

BEAT-MORPHOLOGY MATCHING SCHEME FOR CARDIAC SENSING AND EVENT DETECTION

Номер: US20140276158A1
Автор: ZHANG Xusheng
Принадлежит: Medtronic, Inc.

A medical device and associated method for classifying an unknown cardiac signal operate to sense a cardiac signal over known cardiac cycles and generate a template of the known cardiac cycles. An unknown cardiac signal is sensed over an unknown cardiac cycle. A template alignment point and an unknown cardiac signal alignment point are identified by using a fourth order difference signal. The template and the unknown cardiac signal are aligned across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point. A morphology match metric measuring a similarity between the aligned template and the unknown cardiac signal is computed. 1. A method for classifying cardiac beats for use in detecting cardiac rhythms , comprising:sensing a cardiac signal over a plurality of cardiac cycles using a plurality of electrodes coupled to a sensing module;determining a template of a known cardiac signal in response to the cardiac signal sensed over the plurality of cardiac cycles;sensing an unknown cardiac signal over an unknown cardiac cycle;determining a fourth order difference signal;determining a template alignment point and an unknown cardiac signal alignment point in response to the fourth order difference signal;aligning the template and the unknown cardiac signal across an alignment window by aligning the template alignment point and the unknown cardiac signal alignment point;determining a first morphology match metric between the aligned template and the unknown cardiac signal.2. The method of claim 1 , wherein determining the template comprises:determining a fourth order difference signal in response to the cardiac signal over each of the plurality of cardiac cycles;determining an alignment point from the fourth order difference signal of each of the plurality of cardiac cycles;aligning the plurality of cardiac cycle signals by aligning the alignment points in each of the plurality of cardiac cycles; andaveraging the aligned ...

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Номер записи: 59
18-09-2014 дата публикации

SYSTEM AND METHOD FOR AVOIDING UNDERSENSING OF VENTRICULAR FIBRILLATION

Номер: US20140276160A1
Автор: Brown Mark L., DeGroot Paul J., Greenhut Saul E., Jackson Troy E., ZHANG Xusheng
Принадлежит: Medtronic, Inc.

A medical device and associated method for detecting and treating tachyarrhythmias acquires a cardiac signal using electrodes coupled to a sensing module. Cardiac events are sensed from the cardiac signal and a processing module computes a first morphology metric for each sensed cardiac event occurring during a time segment of the cardiac signal. The first morphology metrics corresponding to an event originating in a ventricular chamber are counted. The first processing module computes a second morphology metric for the time segment of the cardiac signal in response to the count of the first morphology metrics meeting a threshold number of events. The time segment is classified as a shockable segment in response to the second morphology metric meeting a detection criterion. 1. A method for use in a medical device configured to detect and treat tachyarrhythmia , the method comprising:determining a cardiac signal using a plurality of electrodes coupled to a sensing module;sensing cardiac events in response to the cardiac signal;determining a first morphology metric for each sensed cardiac event occurring during a time segment of the cardiac signal;determining a count of the first morphology metrics corresponding to an event originating in a ventricular chamber;determining a second morphology metric for the time segment of the cardiac signal in response to the count of the first morphology metrics meeting a threshold number of events; andclassifying the time segment as a shockable segment in response to the second morphology metric meeting a detection criterion.2. The method of claim 1 , further comprising:determining a number of time segments classified as a shockable segment; anddetecting a shockable rhythm in response to the number of time segments meeting a detection threshold.3. The method of claim 2 , further comprising:determining a number of tachyarrhythmia intervals between the sensed cardiac events in parallel to the computing of the first morphology metrics; ...

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Номер записи: 60
15-07-2021 дата публикации

FAN

Номер: US20210215160A1
Автор: CUI Shiqiang, Fang Yu, KANG Ruixiang, Liang Li, YI Rong, ZHANG Huanming, ZHANG Xusheng
Принадлежит:

Disclosed is a fan. The fan includes a support; a first motor installed on the support, the first motor having a first rotation shaft; a first blade installed on the first rotation shaft; a second motor installed on the support, the second motor having a second rotation shaft and being coaxial with the first motor; a second blade installed on the second rotation shaft, a tilt direction of the second blade being opposite to a tilt direction of the first blade; and an electric control board electrically connected to the first motor and the second motor and configured to control a relative rotation of the first motor and the second motor. 1. A fan , comprising:a support;a first motor installed on the support, the first motor having a first rotation shaft;a first blade installed on the first rotation shaft;a second motor installed on the support, the second motor having a second rotation shaft and being coaxial with the first motor;a second blade installed on the second rotation shaft, a tilt direction of the second blade being opposite to a tilt direction of the first blade; andan electric control board electrically connected to the first motor and the second motor and configured to control a relative rotation of the first motor and the second motor.2. The fan of claim 1 , wherein:an electronic control board includes a speed ratio adjustment device, a speed adjustment device, and a steering adjustment device;the speed ratio adjustment device is configured to adjust and fix a speed ratio of the first motor and the second motor;the speed adjustment device is configured to synchronously adjust speeds of the first motor and the second motor; andthe steering adjustment device is configured to switch rotation directions of the first motor and the second motor.3. The fan of claim 2 , wherein the steering adjustment device includes a protection switch to cut off the steering adjustment device when the first motor and the second motor are working.4. The fan of claim 2 , wherein ...

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Номер записи: 61
20-06-2019 дата публикации

Pace pulse detector for a medical device

Номер: US20190183374A1
Автор: Daniel L. Hansen, Donna M. Salmi, James D. Reinke, Michael B. Terry, Scott A. Hareland, Vinod Sharma, Vladimir P. Nikolski, Xusheng Zhang
Принадлежит: MEDTRONIC INC

In situations in which an implantable medical device (e.g., a subcutaneous ICD) is co-implanted with a leadless pacing device (LPD), it may be important that the subcutaneous ICD knows when the LPD is delivering pacing, such as anti-tachycardia pacing (ATP). Techniques are described herein for detecting, with the ICD and based on the sensed electrical signal, pacing pulses and adjusting operation to account for the detected pulses, e.g., blanking the sensed electrical signal or modifying a tachyarrhythmia detection algorithm. In one example, the ICD includes a first pace pulse detector configured to obtain a sensed electrical signal and analyze the sensed electrical signal to detect a first type of pulses having a first set of characteristics and a second pace pulse detector configured to obtain the sensed electrical signal and analyze the sensed electrical signal to detect a second type of pulses having a second set of characteristics.

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Номер записи: 62
20-06-2019 дата публикации

SUPRAVENTRICULAR TACHYARRHYTHMIA DISCRIMINATION

Номер: US20190184164A1
Автор: Cao Jian, ZHANG Xusheng
Принадлежит:

Techniques are described for discriminating SVT and, in particular, rapidly conducting AF. The techniques include detecting an onset of a fast rate of ventricular events sensed from a cardiac electrical signal and detecting a pause in the fast rate of ventricular sensed events. A threshold number of ventricular event intervals required to detect a ventricular tachyarrhythmia is detected with each of the threshold number of ventricular event intervals being less than a tachyarrhythmia detection interval. Detection of the ventricular tachyarrhythmia and an electrical stimulation therapy for treating the ventricular tachyarrhythmia are withheld in response to at least the pause being detected. 1. A device comprising:a therapy delivery circuit configured to generate an electrical stimulation therapy;a sensing circuit configured to receive a first cardiac electrical signal via a first sensing electrode vector and sense ventricular events from the first cardiac electrical signal; and determine that a first plurality of the sensed ventricular events meet a fast ventricular rate criteria;', 'subsequent to determining the fast ventricular rate criteria is met, detect a pause in a rate of a second plurality of the sensed ventricular events;', 'detect from the first cardiac electrical signal a threshold number of ventricular event intervals required to detect a ventricular tachyarrhythmia, each of the threshold number of ventricular event intervals being less than a tachyarrhythmia detection interval; and', 'withhold the electrical stimulation therapy for treating the ventricular tachyarrhythmia in response to at least the pause being detected., 'a control circuit coupled to the sensing circuit and the therapy delivery circuit and configured to2. The device of claim 1 , wherein:the sensing circuit comprises a first sensing channel configured to sense R-waves associated with ventricular events from the first cardiac electrical signal; determining a ventricular event interval ...

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Номер записи: 63
11-06-2020 дата публикации

CARDIAC ELECTRICAL SIGNAL GROSS MORPHOLOGY-BASED NOISE DETECTION FOR REJECTION OF VENTRICULAR TACHYARRHYTHMIA DETECTION

Номер: US20200178830A1
Автор: Cao Jian, Greenhut Saul E., ZHANG Xusheng
Принадлежит:

A medical device system, such as an extra-cardiovascular implantable cardioverter defibrillator ICD, senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The medical device system determines a morphology parameter correlated to signal noise from time segments of the second cardiac electrical signal, detects a noisy signal segment based on the signal morphology parameter; and withholds detection of a tachyarrhythmia episode in response to detecting a threshold number of noisy signal segments. 1. A medical device system comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first sensing electrode vector coupled to the medical device system and to sense R-waves in response to crossings of a sensing amplitude threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second sensing electrode vector coupled to the medical device system and different than the first sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory for each of the plurality of R-waves sensed by the first sensing channel;', determine a morphology parameter correlated to signal noise from the stored time segment; and', 'detect the stored time segment as being a noisy signal segment based on the morphology parameter determined for the respective stored time segment; and, 'for each of a plurality of the stored time segments,'}, 'withhold detection of a tachyarrhythmia episode in response to detecting at least a threshold number of the stored time segments as noisy signal segments., 'a control circuit coupled to the sensing circuit and the memory, the control circuit configured to2. The system of claim 1 , further comprising a notch filter claim 1 , wherein the time ...

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Номер записи: 64
23-07-2015 дата публикации

CARDIAC RESYNCHRONIZATION THERAPY OPTIMIZATION BASED ON INTRACARDIAC IMPEDANCE

Номер: US20150202436A1
Автор: Cho Yong Kyun, Hettrick Douglas, ZHANG Xusheng, Zielinski Todd M.
Принадлежит:

Methods and/or devices used in delivering cardiac resynchronization therapy based on a plurality of device parameters (e.g., A-V delay, V-V delay, etc.) are optimized by setting a device parameter based on selection data. The selection data may be acquired by acquiring temporal fiducial points (e.g., heart sounds) associated with at least a part of a systolic portion of at least one cardiac cycle and/or temporal fiducial points associated with at least a part of a diastolic portion of the at least one cardiac cycle for each of a plurality of electrode vector configurations, and extracting measurements from the intracardiac impedance signal acquired for each of a plurality of electrode vector configurations based on the temporal fiducial points. The acquired selection data may be scored and used to optimize the device parameter. 1. An implantable medical device for use in delivering cardiac resynchronization therapy to a patient's heart , wherein the cardiac resynchronization therapy is delivered based on a plurality of device parameters , the device comprising:a sensing module configured to monitor at least an intracardiac impedance between at least two electrodes to provide an intracardiac impedance signal;a therapy delivery module configured to deliver cardiac therapy to the patient's heart; and deliver cardiac resynchronization therapy to a patient at a plurality of options for at least one of the device parameters;', acquiring temporal fiducial points associated with at least a part of a systolic portion of at least one cardiac cycle and temporal fiducial points associated with at least a part of a diastolic portion of the at least one cardiac cycle for each of a plurality of electrode vector configurations,', 'acquiring, at each of the plurality of electrode vector configurations and about simultaneously with the acquired fiducial points, an intracardiac impedance signal,', 'extracting measurements from the intracardiac impedance signal for each of the ...

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Номер записи: 65
23-07-2015 дата публикации

CARDIAC RESYNCHRONIZATION THERAPY OPTIMIZATION BASED ON INTRACARDIAC IMPEDANCE AND HEART SOUNDS

Номер: US20150202443A1
Автор: Cho Yong Kyun, Hettrick Douglas, ZHANG Xusheng, Zielinski Todd M.
Принадлежит:

Methods and/or devices used in delivering cardiac resynchronization therapy based on a plurality of device parameters (e.g., A-V delay, V-V delay, etc.) are optimized by setting a device parameter based on selection data. The selection data may be acquired by acquiring temporal fiducial points (e.g., heart sounds) associated with at least a part of a systolic portion of at least one cardiac cycle and/or temporal fiducial points associated with at least a part of a diastolic portion of the at least one cardiac cycle for each of a plurality of electrode vector configurations, and extracting measurements from the intracardiac impedance signal acquired for each of a plurality of electrode vector configurations based on the temporal fiducial points. The acquired selection data may be scored and used to optimize the device parameter. 1. An implantable medical device for use in delivering therapy to a patient's heart comprising:a sensing module configured to monitor an intracardiac impedance between at least two electrodes to provide an intracardiac impedance signal and to monitor heart sounds of a patient;a therapy delivery module configured to deliver cardiac resynchronization therapy to the patient's heart; and [ sensing heart sounds defining temporal fiducial points associated with at least a diastolic portion of the at least one cardiac cycle for each of a plurality of electrode vector configurations,', 'acquiring, at each of the plurality of electrode vector configurations and about simultaneously with the sensed heart sounds, an intracardiac impedance signal,', 'extracting measurements from the intracardiac impedance signal for each of the plurality of electrode vector configurations based at least in part on the defined temporal fiducial points associated with the diastolic portion of the at least one cardiac cycle, and', 'determining selection data for each of the plurality of electrode vector configurations based on the extracted measurements; and, 'acquire ...

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Номер записи: 66
28-07-2016 дата публикации

METHOD AND APPARATUS FOR BEAT ACQUISITION DURING TEMPLATE GENERATION IN A MEDICAL DEVICE HAVING DUAL SENSING VECTORS

Номер: US20160213941A1
Автор: ZHANG Xusheng
Принадлежит:

A method and medical device for generating a template that includes sensing a cardiac signal from a plurality of electrodes, determining a plurality of beats in response to the sensed cardiac signal, determining whether to store a beat of the plurality of beats in a subgroup of a plurality of subgroups for storing beats, determining whether a number of beats stored in one of the plurality of subgroups exceeds a subgroup threshold, and generating a template in response to beats stored in the one of the plurality of subgroups that exceeds the subgroup threshold. 1. A method of generating a template in a medical device , comprising:sensing a cardiac signal from a plurality of electrodes;determining a plurality of beats in response to the sensed cardiac signal;determining whether to store a beat of the plurality of beats in a subgroup of a plurality of subgroups for storing beats;determining whether a number of beats stored in one of the plurality of subgroups exceeds a subgroup threshold; andgenerating a template in response to beats stored in the one of the plurality of subgroups that exceeds the subgroup threshold.2. The method of claim 1 , further comprising:determining, in response to storing a first beat of the plurality of beats in a first subgroup of the plurality of subgroups, whether the first beat is the initial beat to be stored in the first subgroup; andsetting the first beat as a first subgroup template beat in response to the beat being the initial beat.3. The method of claim 1 , further comprising:storing a first beat of the plurality of beats within a first subgroup of the plurality of subgroups;setting the first beat as a first subgroup template beat;comparing a second beat of the plurality of beats to the first subgroup template beat and determining a match between the second beat and the first subgroup template beat;determining whether the match is greater than a match threshold; andstoring the second beat within the first subgroup in response to the ...

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Номер записи: 67
26-07-2018 дата публикации

NOISE DETECTION AND FREQUENCY DETERMINATION IN AN EXTRA-CARDIOVASCULAR IMPLANTABLE CARDIOVERTER DEFIBRILLATOR SYSTEM

Номер: US20180207436A1
Автор: ZHANG Xusheng
Принадлежит:

An extra-cardiovascular implantable cardioverter defibrillator is configured to store a cardiac signal segment in response to sensing a cardiac event and obtain a notch filtered signal segment by notch filtering the cardiac signal segment. The ICD determines a count of crossings of the notch filtered signal segment by the cardiac signal segment and determines whether electromagnetic interference (EMI) is present in the cardiac signal segment based on a value of the count. 1. An extra-cardiovascular implantable cardioverter defibrillator (ICD) comprising:a therapy delivery circuit configured to deliver a tachyarrhythmia therapy to a patient's heart via extra-cardiovascular electrodes;a sensing circuit configured to receive a first cardiac electrical signal via a first extra-cardiovascular sensing electrode vector and sense a cardiac event in response to the first cardiac electrical signal crossing a sensing threshold amplitude;a memory; and store a cardiac signal segment in the memory in response to the sensing circuit sensing the cardiac event;', 'obtain a notch filtered signal segment by notch filtering the cardiac signal segment;', 'determine a count of crossings of the notch filtered signal segment by the cardiac signal segment;', 'determine whether electromagnetic interference (EMI) is present in the cardiac signal segment based on a value of the count; and', 'withhold a tachyarrhythmia therapy in response to determining that EMI is present., 'a control circuit coupled to the sensing circuit, the therapy delivery circuit and the memory, the control circuit configured to2. The ICD of claim 1 , wherein the control circuit is configured to store the cardiac signal segment from the first cardiac electrical signal.3. The ICD of claim 1 , wherein:the sensing circuit is further configured to receive a second cardiac electrical signal via a second extra-cardiovascular sensing electrode vector different than the first extra-cardiovascular sensing electrode vector; andthe ...

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Номер записи: 68
26-07-2018 дата публикации

DETECTION OF ELECTROMAGNETIC INTERFERENCE IN A CARDIAC ELECTRICAL SIGNAL BY AN IMPLANTABLE MEDICAL DEVICE

Номер: US20180207437A1
Автор: Greenhut Saul E., HEINKS Michael W., Solheim Paul R., ZHANG Xusheng
Принадлежит:

An implantable cardioverter defibrillator (ICD) starts a timer set to a time interval in response to a cardiac electrical signal crossing a noise threshold amplitude and resets the timer to the time interval in response to each crossing of the noise threshold amplitude by the cardiac electrical signal that occurs prior to the time interval expiring. A control circuit of the ICD determines a parameter of the behavior of the timer and identifies a sensed cardiac event as an electromagnetic interference (EMI) event based on the parameter. The ICD may detect EMI in response to the EMI event and withhold a tachyarrhythmia detection or therapy in response to EMI detection. 1. An implantable cardioverter defibrillator (ICD) comprising:a therapy delivery circuit configured to deliver a tachyarrhythmia therapy to a patient's heart via a pacing electrode vector coupleable to the therapy delivery circuit;a sensing circuit configured to receive a first cardiac electrical signal via a sensing electrode vector coupleable to the sensing circuit and to sense a first cardiac event in response to a first crossing of a sensing threshold amplitude by the first cardiac electrical signal and sense a second cardiac event in response to a second crossing of the sensing threshold amplitude by the first cardiac electrical signal; and start a first timer set to a first time interval in response to the first cardiac electrical signal crossing a noise threshold amplitude;', 'reset the first timer to the first time interval in response to each crossing of the noise threshold amplitude by the first cardiac electrical signal that occurs prior to the first time interval expiring;', 'determine at least a first parameter of a behavior of the first timer;', 'in response to the sensing circuit sensing the second cardiac event, compare at least the first parameter to electromagnetic interference (EMI) event criteria;', 'identify the second cardiac event as an EMI event in response to the EMI event ...

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Номер записи: 69
20-08-2015 дата публикации

METHOD AND APPARATUS FOR DETECTING ARRHYTHMIAS IN A SUBCUTANEOUS MEDICAL DEVICE

Номер: US20150230723A1
Автор: Ghanem Raja N., Stadler Robert W., ZHANG Xusheng
Принадлежит:

A subcutaneously implantable cardiac medical device and a method of sensing a cardiac signal therein that includes a plurality of electrodes to sense a cardiac signal along a plurality of sensing vectors to detect a first interval and a second interval associated with a first detected event, and a processor configured to determine whether the first interval and the second interval are shorter than a predetermined threshold, determine whether the first interval and the second interval are similar, and determine, in response to the first interval and the second interval being similar, whether the sensed cardiac signal is either a noisy signal or a QRS signal. 1. A subcutaneously implantable cardiac medical device , comprising:a plurality of electrodes to sense a cardiac signal along a plurality of sensing vectors to detect a first interval and a second interval associated with a first detected event; anda processor configured to determine whether the first interval and the second interval are shorter than a predetermined threshold, determine whether the first interval and the second interval are similar, and determine, in response to the first interval and the second interval being similar, whether the sensed cardiac signal is either a noisy signal or a QRS signal.2. The subcutaneously implantable cardiac medical device of claim 1 , wherein determining whether the first interval and the second interval are similar comprises determining whether both the first interval and the second interval comprise regular intervals.3. The subcutaneously implantable cardiac medical device of claim 1 , wherein the processor is configured to perform an amplitude analysis in response to the first interval and the second interval being similar claim 1 , and characterize the sensed cardiac signal is either a noisy signal or a QRS signal in response to the amplitude analysis.4. The subcutaneously implantable cardiac medical device of claim 3 , wherein the processor is configured to ...

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Номер записи: 70
02-07-2020 дата публикации

Stator for motor and motor

Номер: US20200212734A1
Автор: Chuan DENG, Guohua DU, Joy GONG, Xusheng Zhang, Yigang YUAN
Принадлежит: FORD GLOBAL TECHNOLOGIES LLC

An electric machine operable as a motor or generator includes a stator having a body portion substantially in the shape of a hollow column with an outer wall and an inner wall. The body portion has a plurality of first slots and a plurality of second slots each running through the body portion in a longitudinal direction. The plurality of first slots are distributed in a circumferential direction between the outer wall and the inner wall, and the first slots are circumferentially closed slots. The plurality of second slots are distributed in the circumferential direction between the first slots and the inner wall, and the second slots are circumferentially closed slots and are spaced apart from the first slots.

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Номер записи: 71
19-08-2021 дата публикации

MEDICAL DEVICE AND METHOD FOR DETECTING ELECTRICAL SIGNAL NOISE

Номер: US20210251551A1
Автор: Greenhut Saul E., Liu Yuanzhen, ZHANG Xusheng
Принадлежит:

A medical device is configured to sense an electrical signal and determine that signal to noise criteria are met based on electrical signal segments stored in response to sensed electrophysiological events. The medical device is configured to determine an increased gain signal segment from one of the stored electrical signal segments in response to determining that the signal to noise criteria are met. The medical device determines a noise metric from the increased gain signal segment. The stored electrical signal segment associated with the increased gain signal segment may be classified as a noise segment in response to the noise metric meeting noise detection criteria. 1. A medical device comprising:a sensing circuit configured to sense at least one electrical signal and sense a plurality of electrophysiological events from the at least one electrical signal;a memory; and store an electrical signal segment from the at least one electrical signal sensed by the sensing circuit in the memory in response to each one of the plurality of electrophysiological events sensed by the sensing circuit;', 'determine that signal to noise criteria are met based on the stored electrical signal segments;', 'determine an increased gain signal segment from one of the stored electrical signal segments in response to determining that the signal to noise criteria are met;', 'determine a noise metric from the increased gain signal segment;', 'determine that the noise metric meets noise detection criteria; and', 'classify the one of the stored electrical signal segments associated with the increased gain signal segment as a noise segment in response to the noise metric meeting the noise detection criteria., 'a control circuit coupled to the sensing circuit and the memory and configured to2. The device of claim 1 , wherein the control circuit is further configured to determine that the signal to noise criteria are met by one or more of:(a) determining a differential signal from at least ...

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Номер записи: 72
30-10-2014 дата публикации

STAGED RHYTHM DETECTION SYSTEM AND METHOD

Номер: US20140323894A1
Автор: Brown Mark L, Greenhut Saul E, Stadler Robert W, ZHANG Xusheng
Принадлежит:

A medical device and associated method for detecting and treating tachyarrhythmias acquires a cardiac signal using electrodes coupled to a sensing module. During an initial detection process, a shockable cardiac rhythm is detected by a processing module configured to compare the cardiac signal to a first set of detection criteria. By analyzing the cardiac signal, the processing module establishes at least one patient-specific detection threshold during the initial detection process. Upon establishing the at least one patient-specific detection threshold, the initial detection process is stopped, and a next detection process is started which includes comparing the cardiac signal to a second set of detection criteria including the at least one patient-specific detection threshold. In some embodiments, user programming of tachyarrhythmia detection parameters is not required. 1. A method for use in a medical device configured to detect and treat tachyarrhythmia , the method comprising:acquiring a cardiac signal using a plurality of electrodes coupled to a sensing module;during an initial detection process detecting a shockable cardiac rhythm by a processing module configured to compare the cardiac signal to a first set of detection criteria;establishing, by the processing module analyzing the cardiac signal, at least one patient-specific detection threshold during the initial detection process; andupon establishing the at least one patient-specific detection threshold, stopping the initial detection process and starting a next detection process comprising comparing the cardiac signal to a second set of detection criteria comprising the at least one patient-specific detection threshold,the first set of detection criteria relating to a first set of cardiac signal features, the second set of detection criteria relating to a second set of cardiac signal features different than the first set of cardiac signal features.2. The method of claim 1 , wherein the first set of ...

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Номер записи: 73
16-08-2018 дата публикации

HOUSING FOR BOX FAN, BOX FAN AND ASSEMBLY METHOD THEREOF

Номер: US20180231024A1
Автор: Deng Meihua, GUO Runming, Liu Weiliang, Yan Fengxi, ZHANG Xusheng
Принадлежит:

A housing () for a box fan (), the box fan () and an assembly method therefor are provided. The box fan () includes a housing () and a fan blade. The housing () includes two shields () and a frame. The two shields () are arranged opposite to and spaced apart from each other. The frame is arranged between the two shields (). The frame and the two shields () are joined and mounted through their own structures respectively, and at least one of the shields can be attached to or detached from the frame by pushing or pulling. The fan blade is rotatably installed in the housing (). The box fan is easy to assemble and low in cost. 1. A box fan comprising:a housing, the housing comprising two shields and a frame, the two shields being opposite to and spaced from each other, the frame being arranged between the two shields, the frame and the two shields being joined and mounted through their own structures, and at least one of the shields being pushably and pullably mounted and dismounted relative to the frame; anda fan blade rotatably arranged in the housing.2. The box fan according to claim 1 , wherein each of the two shields and the frame is a plastic part.3. The box fan according to claim 1 , wherein at least one of the shields is fitted with the frame through one or more of: snap connection claim 1 , and insertion connection.4. The box fan according to claim 1 , wherein the frame comprises a plurality of lateral plates which are joined and mounted head to tail sequentially.5. The box fan according to claim 4 , wherein two adjacent lateral plates are fitted with each other through one or more of: snap connection and insertion connection.6. The box fan according to claim 1 , wherein the two shields are a first shield and a second shield arranged opposite to each other claim 1 , each of the first shield and the second shield is configured as a rectangle claim 1 , the frame comprises a first lateral plate claim 1 , a second lateral plate claim 1 , a third lateral plate and a ...

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Номер записи: 74
24-08-2017 дата публикации

SYSTEM AND METHOD FOR PACING PARAMETER OPTIMIZATION USING HEART SOUNDS

Номер: US20170239472A1
Автор: Gillberg Jeffrey M., Mullen Thomas J., ZHANG Xusheng
Принадлежит:

A medical device system and associated method predict a patient response to a cardiac therapy. The system includes for delivering cardiac pacing pulses to a patient's heart coupled to a cardiac sensing module and a cardiac pacing module for generating cardiac pacing pulses and controlling delivery of the pacing pulses at multiple pace parameter settings. An acoustical sensor obtains heart sound signals. A processor is enabled to receive the heart sound signals, derive a plurality of heart sound signal parameters from the heart sound signals, and determine a trend of each of the plurality of heart sound signal parameters with respect to the plurality of pace parameter settings. An external display is configured to present the trend of at least one heart sound parameter with respect to the plurality of pace parameter settings. 1. A medical device system , comprising:a plurality of electrodes for delivering cardiac pacing pulses to a patient's heart;a cardiac sensing module coupled to the plurality of electrodes;a cardiac pacing module coupled to the plurality of electrodes for generating cardiac pacing pulses and controlling delivery of the pacing pulses at a plurality of pace parameter settings;an acoustical sensor for obtaining heart sound signals; anda processor enabled to control the pacing module to delivery the pacing pulses, receive the heart sound signals, derive a plurality of heart sound signal parameters from the heart sound signals, and determine a trend of each of the plurality of heart sound signal parameters with respect to the plurality of pace parameter settings; andan external display configured to present the trend of at least one heart sound parameter with respect to the plurality of pace parameter settings.2. The system of claim 1 , wherein the processor is further configured to identify an optimal pace parameter setting from the plurality of pace parameter settings; andthe external display is further configured to present the optimal pace ...

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Номер записи: 75
23-08-2018 дата публикации

REAR GUARD OF BOX FAN AND BOX FAN

Номер: US20180238352A1
Автор: Deng Meihua, GUO Runming, JIANG Tuanguang, Liu Weiliang, Yan Fengxi, ZHANG Xusheng
Принадлежит:

A rear guard of a box fan comprises: a body arranged vertically and a waterproof part arranged on the body. The waterproof part is arranged in a position corresponding to a motor in the box fan and the waterproof part comprises a plurality of recessed structures arranged on the body. a plurality of vent holes are arranged on the body for communicating an inner side of the body with an outer side of the body are arranged in the recessed structures. By arranging the vent holes in the recessed structures, the waterproof effect is realized on the premise of ensuring ventilation, the electric leakage and ignition of the motor can be effectively prevented, and the lifetime of the motor of the box fan is extended. 1. A rear guard of a box fan , comprising:a body arranged vertically; anda waterproof part arranged on the body, the waterproof part being arranged in a position corresponding to a motor in the box fan, wherein the waterproof part further comprises a plurality of recessed structures arranged on the body, and a plurality of vent holes for communicating an inner side of the body with an outer side of the body being arranged in the plurality of recessed structures.2. The rear guard according to claim 1 , wherein the vent holes are located in the upper parts of the plurality of recessed structures.3. The rear guard according to claim 2 , wherein each recessed structure comprises a bottom surface and a plurality of side walls connected to the bottom surface and each vent hole is arranged at a connection between the bottom surface and the side walls.4. The rear guard according to claim 3 , wherein the vent hole is one selected from the group consisting of a line-shaped elongated hole claim 3 , an L-shaped hole and a combination thereof.5. The rear guard according to claim 1 , wherein the plurality of recessed structures integrally constitute the waterproof part.6. A box fan claim 1 , comprising:a housing;a plurality of fan blades;a motor; anda rear guard, wherein the ...

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Номер записи: 76
01-08-2019 дата публикации

Method and apparatus for adjusting a blanking period during transitioning between operating states in a medical device

Номер: US20190232069A1
Автор: Robert W. Stadler, Saul E. Greenhut, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A method and medical device for adjusting a blanking period that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors, determining whether to adjust a blanking period during a first operating state, advancing from the first operating state to a second operating state in response to the sensed cardiac signals, determining, while in the second operating state, whether the blanking period was adjusted while in the first operating state, and adjusting the blanking period while in the second operating state in response to the blanking period being adjusted while in the first operating state.

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Номер записи: 77
30-08-2018 дата публикации

SYSTEM AND METHOD FOR SENSING AND DETECTION IN AN EXTRA-CARDIOVASCULAR IMPLANTABLE CARDIOVERTER DEFIBRILLATOR

Номер: US20180243579A1
Автор: Cao Jian, Greenhut Saul E., Stadler Robert W., ZHANG Xusheng
Принадлежит:

An extra-cardiovascular implantable cardioverter defibrillator senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The ICD determines intervals between successively sensed R-waves and, in response to at least a predetermined number of the intervals being less than a tachyarrhythmia detection interval, analyzes at least a portion of the time segment of the second cardiac electrical signal corresponding to a most recent one of the sensed R-waves to confirm the most recent one of the R-waves. The ICD updates an unconfirmed beat count in response to the most recent one of the R-waves not being confirmed and withholds detection of a tachyarrhythmia episode in response to the unconfirmed beat count being equal to or greater than a rejection threshold. 1. An extra-cardiovascular implantable cardioverter defibrillator (ICD) , comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first extra-cardiovascular sensing electrode vector coupled to the extra-cardiovascular ICD and to sense a first plurality of R-waves in response to crossings of a first R-wave sensing threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second extra-cardiovascular sensing electrode vector coupled to the extra-cardiovascular ICD and different than the first extra-cardiovascular sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory in response to each one of the first plurality of R-waves sensed by the first sensing channel;', 'determine a first plurality of intervals between successive ones of the first plurality of R-waves sensed by the first sensing channel;', 'in response to at least a first predetermined number of the first plurality of intervals ...

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Номер записи: 78
30-07-2020 дата публикации

Stator for motor and method of manufacturing

Номер: US20200244113A1
Автор: Chuan DENG, Guohua DU, Joy GONG, Xusheng Zhang, Yigang YUAN
Принадлежит: FORD GLOBAL TECHNOLOGIES LLC

A stator for a motor includes laminations arranged axially adjacently. A first lamination includes sub-yoke parts and tooth parts. The sub-yoke parts are spliced through a first yoke engaging part to form an annular first yoke part. The first tooth parts are assembled on an inner edge of the first yoke part through a first tooth engaging part. The second lamination includes sub-yoke parts and tooth parts. The sub-yoke parts are spliced through a second yoke engaging part to form an annular second yoke part. The second tooth parts are assembled on an inner edge of the second yoke part through a second tooth engaging part. The first and second tooth engaging parts are superposed in the axial direction. A method of manufacturing a stator for a motor is also described.

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Номер записи: 79
15-08-2019 дата публикации

SYSTEMS AND METHODS FOR LEADLESS PACING AND SHOCK THERAPY

Номер: US20190247673A1
Автор: Demmer Wade M., Greenhut Saul E., Jackson Troy E., NEHLS Robert J., Olson Walter H., Reinke James D., ZHANG Xusheng
Принадлежит:

Techniques and systems for monitoring cardiac arrhythmias and delivering electrical stimulation therapy using a subcutaneous implantable cardioverter defibrillator (SICD) and a leadless pacing device (LPD) are described. For example, the SICD may detect a tachyarrhythmia within a first electrical signal from a heart and determine, based on the tachyarrhythmia, to deliver anti-tachyarrhythmia shock therapy to the patient to treat the detected arrhythmia. The LPD may receive communication from the SICD requesting the LPD deliver anti-tachycardia pacing to the heart and determine, based on a second electrical signal from the heart sensed by the LPD, whether to deliver anti-tachycardia pacing (ATP) to the heart. In this manner, the SICD and LPD may communicate to coordinate ATP and/or cardioversion/defibrillation therapy. In another example, the LPD may be configured to deliver post-shock pacing after detecting delivery of anti-tachyarrhythmia shock therapy. 1. A leadless pacing device (LPD) comprising:a housing;a set of two or more electrodes carried on the housing and configured to sense electrical signals of the heart;a processor within the housing and configured to receive an indication of a detected tachyarrhythmia;a shock detector within the housing and configured to detect delivery of anti-tachyarrhythmia shock therapy, wherein the processor activates the shock detector in response to receiving the indication of the detected tachyarrhythmia; anda signal generator within the housing and configured to generate and deliver, in response to the detection of the delivery of anti-tachyarrhythmia shock therapy, post-shock pacing therapy to the heart of the patient via at least a subset of the set of electrodes.2. The LPD of claim 1 , wherein the processor is configured to receive the indication of the detected tachyarrhythmia by analyzing the sensed electrical signals to detect the tachyarrhythmia.3. The LPD of claim 2 , further comprising an activity sensor configured ...

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Номер записи: 80
01-10-2015 дата публикации

METHOD AND APPARATUS FOR DETECTING ARRHYTHMIAS IN A SUBCUTANEOUS MEDICAL DEVICE

Номер: US20150272460A1
Автор: Ghanem Raja N., Stadler Robert W., ZHANG Xusheng
Принадлежит:

A method and system for use with an implantable medical device for subcutaneous implant within a patient to determine a likelihood of the patient experiencing a cardiac event that includes sensing a cardiac signal along a plurality of different sensing vectors, determining state information of each vector of the plurality of sensing vectors, determining a cross correlation of the determined state information of each vector of the plurality of sensing vectors, comparing the cross correlation of the determined state information of each vector of the plurality of sensing vectors to a threshold, and detecting the cardiac event in response to the comparing. 1. A method of determining a likelihood of an occurrence of a cardiac event in a subcutaneously implanted medical device , comprisingsensing a cardiac signal along a plurality of different sensing vectors;determining state information of each vector of the plurality of sensing vectors;determining a cross correlation of the determined state information of each vector of the plurality of sensing vectors;comparing the cross correlation of the determined state information of each vector of the plurality of sensing vectors to a threshold; anddetecting the cardiac event in response to the comparing.2. The method of claim 1 , wherein determining state information of each vector of the plurality of sensing vectors comprises identifying each vector of the plurality of sensing vectors as being one of shockable and not shockable.3. The method of claim 2 , wherein the plurality of different sensing vectors comprises a first sensing vector and a second sensing vector claim 2 , and determining a cross correlation of the determined state information of each vector of the plurality of sensing vectors to a threshold comprises determining whether both the first sensing vector and the second sensing vector are identified as being shockable claim 2 , whether both the first sensing vector and the second sensing vector are identified as ...

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Номер записи: 81
01-10-2015 дата публикации

METHOD AND APPARATUS FOR DISCRIMINATING TACHYCARDIA EVENTS IN A MEDICAL DEVICE

Номер: US20150273227A1
Автор: Stadler Robert W., ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector, identifying the cardiac event as one of a shockable event and a non-shockable event in response to first processing of a first interval sensed along the first sensing vector during a predetermined sensing window and a second interval simultaneously sensed along the second sensing vector, performing second processing of the first interval and the second interval, different from the first processing, in response to the cardiac event being identified as a shockable event, and determining whether to delay identifying the cardiac event being shockable in response to the second processing of the first interval and the second interval. 1. A method of detecting a cardiac event in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector;identifying the cardiac event as one of a shockable event and a non-shockable event in response to first processing of a first interval sensed along the first sensing vector during a predetermined sensing window and a second interval simultaneously sensed along the second sensing vector;performing second processing of the first interval and the second interval, different from the first processing, in response to the cardiac event being identified as a shockable event; anddetermining whether to delay identifying the cardiac event being shockable in response to the second processing of the first interval and the second interval.2. The method of claim 1 , further comprising determining whether the cardiac event is monomorphic ventricular tachycardia in response to the second processing.3. The method of claim 1 , wherein performing second processing of the first interval and the second interval comprises:identifying R- ...

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Номер записи: 82
01-10-2015 дата публикации

METHOD AND APPARATUS FOR DISCRIMINATING TACHYCARDIA EVENTS IN A MEDICAL DEVICE

Номер: US20150273228A1
Автор: Stadler Robert W., ZHANG Xusheng
Принадлежит:

A method and medical for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector, determining, during first processing of a first interval sensed along the first sensing vector during a predetermined sensing window and a second interval sensed along the second sensing vector during the predetermined sensing window, whether one or both of the first interval and the second interval is within one of a ventricular tachycardia shock zone and a ventricular fibrillation shock zone, identifying the cardiac event as a shockable event in response to one or both of the first interval and the second interval determined as being within the ventricular tachycardia shock zone, identifying the cardiac event as a shockable event in response to both of the first interval and the second interval determined as being within the ventricular fibrillation shock zone, and determining whether to confirm the cardiac event being identified as a shockable event in response to the identifying. 1. A method of detecting a cardiac event in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector;determining, during first processing of a first interval sensed along the first sensing vector during a predetermined sensing window and a second interval sensed along the second sensing vector during the predetermined sensing window, whether one or both of the first interval and the second interval is within one of a ventricular tachycardia shock zone and a ventricular fibrillation shock zone;identifying the cardiac event as a shockable event in response to one or both of the first interval and the second interval determined as being within the ventricular tachycardia shock zone;identifying the cardiac event as a shockable event in response to both of the first ...

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Номер записи: 83
01-10-2015 дата публикации

METHOD AND APPARATUS FOR DISCRIMINATING TACHYCARDIA EVENTS IN A MEDICAL DEVICE

Номер: US20150273229A1
Автор: Stadler Robert W., ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector, determining, in response to the cardiac event being identified as a shockable event, a first R-wave morphology corresponding to R-waves of a next interval subsequently sensed along the first sensing vector during the predetermined sensing window and a second R-wave morphology corresponding to R-waves of a next interval subsequently sensed along the second sensing vector, determining whether the next interval subsequently sensed along the first sensing vector and the next interval subsequently sensed along the second sensing vector satisfy a morphology metric, and identifying the cardiac event as one of a monomorphic ventricular tachycardia and a polymorphic ventricular tachycardia in response to the determined first R-wave morphology, second R-wave morphology, and the next interval subsequently sensed along the first sensing vector and the next interval subsequently sensed along the second sensing vector not satisfying the morphology metric. 1. A method of discriminating a cardiac event as being one of a monomorphic ventricular tachycardia and a polymorphic ventricular tachycardia in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector;identifying the cardiac event as one of a shockable event and a non-shockable event in response to a first interval sensed along the first sensing vector during a predetermined sensing window and a second interval simultaneously sensed along the second sensing vector;determining, in response to the cardiac event being identified as a shockable event, a first R-wave morphology corresponding to R-waves of a next interval subsequently sensed along the first sensing vector during the predetermined sensing ...

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Номер записи: 84
18-11-2021 дата публикации

MEDICAL DEVICE AND METHOD FOR DETECTING ELECTRICAL SIGNAL NOISE

Номер: US20210353233A1
Автор: Greenhut Saul E., Liu Yuanzhen, ZHANG Xusheng
Принадлежит:

A medical device is configured to sense event signals from a cardiac electrical signal and determine maximum amplitudes of cardiac electrical signal segments associated with sensed event signals. The medical device is configured to determine at least one tachyarrhythmia metric based on at least a greatest one of the determined maximum amplitudes. The medical device may determine when the at least one tachyarrhythmia metric does not meet true tachyarrhythmia evidence and, in response, determine when the maximum amplitudes meet suspected noise criteria. The medical device may withhold a tachyarrhythmia detection and tachyarrhythmia therapy when suspected noise criteria are met. 1. A medical device comprising:a sensing circuit configured to sense at least one cardiac electrical signal and sense event signals from the at least one cardiac electrical signal; and determine a maximum amplitude associated with each of a plurality of the sensed event signals;', 'identify a greatest maximum amplitude from the determined maximum amplitudes;', 'determine at least one tachyarrhythmia metric based on at least the identified greatest maximum amplitude;', 'determine the at least one tachyarrhythmia metric does not meet true tachyarrhythmia evidence criteria;', 'in response to the at least one tachyarrhythmia metric not meeting true tachyarrhythmia evidence criteria, determine that suspected noise criteria are met based on the determined maximum amplitudes;', 'determine that a tachyarrhythmia detection criterion is met based on event signals sensed by the sensing circuit; and', 'in response to determining that suspected noise criteria are met, withhold a tachyarrhythmia detection when the tachyarrhythmia detection criterion is determined to be met., 'a control circuit coupled to the sensing circuit and configured to2. The device of claim 1 , wherein the control circuit is configured to:set a threshold amplitude based on the greatest maximum amplitude;identify each of the maximum ...

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Номер записи: 85
15-10-2015 дата публикации

METHOD AND APPARATUS FOR DISCRIMINATING TACHYCARDIA EVENTS IN A MEDICAL DEVICE USING TWO SENSING VECTORS

Номер: US20150290468A1
Автор: ZHANG Xusheng
Принадлежит:

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes forming a first sensing vector sensing a first interval of the cardiac signal during a predetermined time period and a second sensing vector simultaneously sensing a second interval of the cardiac signal during the predetermined time period, identifying each of the first interval and the second interval as being one of shockable and not shockable in response to first processing of the first interval and the second interval and in response to second processing of one or both of the first interval and the second interval, the second processing being different from the first processing, and determining whether to deliver therapy for the cardiac event in response to identifying each of the first interval and the second interval as being one of shockable and not shockable in response to both the first processing and the second processing of the first interval and the second interval. 1. A method of detecting a cardiac event in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector sensing a first interval of the cardiac signal during a predetermined time period and a second sensing vector simultaneously sensing a second interval of the cardiac signal during the predetermined time period;identifying each of the first interval and the second interval as being one of shockable and not shockable in response to first processing of the first interval and the second interval;identifying each of the first interval and the second interval as being one of shockable and not shockable in response to second processing of one or both of the first interval and the second interval, the second processing being different from the first processing; anddetermining whether to deliver therapy for the cardiac event in response to identifying each of the first interval and the ...

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Номер записи: 86
06-10-2016 дата публикации

METHOD INTEGRATING TARGET OPTIMIZATION AND OPTICAL PROXIMITY CORRECTION

Номер: US20160291458A1
Автор: He Daquan, Lv Yukun, Wei Fang, ZHANG Xusheng, ZHU Jun
Принадлежит:

A method integrating target optimization and optical proximity correction including: fragmenting sides of a target pattern in the metal layer to form a plurality of fragments; simulating the target pattern and calculating image log slope of each fragment; calculating a target pattern optimal parameter for each fragment which is a product of three parameters including the image log slope, overlap ratio of the target pattern and a via pattern in a via layer, and critical dimension; optimizing the target pattern based on the target pattern optimal parameter; preforming optical proximity correction to the optimized target pattern; determining whether the corrected target pattern meets requirements; if yes, ending the target optimization and optical proximity correction; otherwise, using the corrected target pattern as a current target pattern and iterate from the step of simulating the target pattern and calculating image log slope of each fragment. 1. A method integrating target optimization and optical proximity correction comprising the following steps:{'b': '01', 'Step S: inputting a design pattern which includes at least a metal layer and a via layer;'}{'b': '02', 'Step S: fragmenting sides of a target pattern in the metal layer to form a plurality of fragments;'}{'b': '03', 'Step S: simulating the target pattern and calculating image log slope of each fragment;'}{'b': '04', 'Step S: calculating a target pattern optimal parameter for each fragment, wherein the target pattern optimal parameter is a product of three parameters including the image log slope of the fragment, a ratio of a portion of an overlap between the target pattern and a via pattern in the via layer which corresponds to the fragment to a portion of the via pattern which corresponds to the fragment; and a critical dimension of the fragment;'}{'b': '05', 'Step S: optimizing the target pattern based on the target pattern optimal parameter for each fragment;'}{'b': '06', 'Step S: preforming optical ...

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Номер записи: 87
22-10-2015 дата публикации

SYSTEMS AND METHODS FOR LEADLESS PACING AND SHOCK THERAPY

Номер: US20150297905A1
Автор: Demmer Wade M., Greenhut Saul E., Jackson Troy E., NEHLS Robert J., Olson Walter H., Reinke James D., ZHANG Xusheng
Принадлежит:

Techniques and systems for monitoring cardiac arrhythmias and delivering electrical stimulation therapy using a subcutaneous implantable cardioverter defibrillator (SICD) and a leadless pacing device (LPD) are described. For example, the SICD may detect a tachyarrhythmia within a first electrical signal from a heart and determine, based on the tachyarrhythmia, to deliver anti-tachyarrhythmia shock therapy to the patient to treat the detected arrhythmia. The LPD may receive communication from the SICD requesting the LPD deliver anti-tachycardia pacing to the heart and determine, based on a second electrical signal from the heart sensed by the LPD, whether to deliver anti-tachycardia pacing (ATP) to the heart. In this manner, the SICD and LPD may communicate to coordinate ATP and/or cardioversion/defibrillation therapy. In another example, the LPD may be configured to deliver post-shock pacing after detecting delivery of anti-tachyarrhythmia shock therapy. 1. A leadless pacing device (LPD) comprising:a housing;a set of two or more electrodes carried on the housing and configured to sense electrical signals of the heart;a processor within the housing and configured to receive an indication of a detected tachyarrhythmia;a shock detector within the housing and configured to detect delivery of anti-tachyarrhythmia shock therapy, wherein the processor activates the shock detector in response to receiving the indication of the detected tachyarrhythmia; anda signal generator within the housing and configured to generate and deliver, in response to the detection of the delivery of anti-tachyarrhythmia shock therapy, post-shock pacing therapy to the heart of the patient via at least a subset of the set of electrodes.2. The LPD of claim 1 , wherein the processor is configured to receive the indication of the detected tachyarrhythmia by analyzing the sensed electrical signals to detect the tachyarrhythmia.3. The LPD of claim 2 , further comprising an activity sensor configured ...

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Номер записи: 88
22-10-2015 дата публикации

METHOD AND APPARATUS FOR VERIFYING DISCRIMINATING OF TACHYCARDIA EVENTS IN A MEDICAL DEVICE HAVING DUAL SENSING VECTORS

Номер: US20150297907A1
Автор: ZHANG Xusheng
Принадлежит: Medtronic, Inc.

A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector sensing a first interval and a second sensing vector simultaneously sensing a second, determining, for each of the first interval and the second interval, whether each beat of the plurality of beats is one of a match beat and a non-match beat, determining whether each beat of the plurality of beats is one of a high confidence beat and a low confidence beat, determining, for each of the first interval and the second interval, the number of beats determined to be both a non-match beat and a high confidence beat is greater than a non-match threshold, and determining whether to deliver therapy for the cardiac event in response to identifying of each of the first interval and the second interval as being one of shockable and not shockable. 1. A method of detecting a cardiac event in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector sensing a first interval of the cardiac signal comprising a plurality of beats during a predetermined time period and a second sensing vector simultaneously sensing a second interval of the cardiac signal comprising a plurality of beats during the predetermined time period;determining, for each of the first interval and the second interval, whether each beat of the plurality of beats is one of a match beat and a non-match beat;determining whether each beat of the plurality of beats is one of a high confidence beat and a low confidence beat;determining, for each of the first interval and the second interval, the number of beats determined to be both a non-match beat and a high confidence beat is greater than a non-match threshold;identifying each of the first interval and the second interval as being one of shockable and not shockable in response to the number of ...

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Номер записи: 89
29-10-2015 дата публикации

METHOD AND APPARATUS FOR SELECTING A SENSING VECTOR CONFIGURATION IN A MEDICAL DEVICE

Номер: US20150305637A1
Автор: Greenhut Saul E., Stadler Robert W., ZHANG Xusheng
Принадлежит:

A method and medical device for determining sensing vectors that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors, determining signal differences during a detection window in each of the plurality of sensing vectors, ranking sensing vectors of the plurality of sensing vectors in response to the determined signal differences, and selecting one or more sensing vectors of the plurality of sensing vectors in response to the determined rankings. 1. A method of determining sensing vectors in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors;determining signal differences during a detection window in each of the plurality of sensing vectors;ranking sensing vectors of the plurality of sensing vectors in response to the determined signal differences; andselecting one or more sensing vectors of the plurality of sensing vectors in response to the determined rankings.2. The method of claim 1 , wherein determining signal differences during a detection window in each of the plurality of sensing vectors comprises:sensing an R-wave in response to the cardiac signal exceeding a sensing threshold;determining signal differences between the cardiac signal sensed during the detection window and the sensing threshold; anddetermining a minimum signal difference of the determined signal differences.3. The method of further comprising determining whether the cardiac signal exceeds the sensing threshold during the detection window claim 2 , wherein the minimum signal difference is determined for the detection window in response to the cardiac signal not exceeding the sensing threshold during the detection window.4. The method of claim 2 , wherein selecting one or more sensing vectors of the plurality of sensing vectors comprises:selecting a vector of the plurality of vectors having the greatest determined ...

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Номер записи: 90
29-10-2015 дата публикации

METHOD AND APPARATUS FOR SELECTING A SENSING VECTOR CONFIGURATION IN A MEDICAL DEVICE

Номер: US20150305638A1
Автор: ZHANG Xusheng
Принадлежит:

A method and medical device for determining sensing vectors that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors, determining a sensing vector metric in response to the sensed cardiac signals, determining a morphology metric associated with a morphology of the sensed cardiac signals, determining vector selection metrics in response to the determined sensing vector metric and the determined morphology setting, and selecting a sensing vector of the plurality of sensing vectors in response to the determined vector selection metrics. 1. A method of determining sensing vectors in a medical device , comprising:sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors;determining a sensing vector metric in response to the sensed cardiac signals;determining a morphology metric associated with a morphology of the sensed cardiac signals;determining vector selection metrics in response to the determined sensing vector metric and the determined morphology setting; andselecting a sensing vector of the plurality of sensing vectors in response to the determined vector selection metrics.2. The method of claim 1 , wherein determining a sensing vector metric comprises;sensing an R-wave in response to the cardiac signal exceeding a sensing threshold;determining signal differences between the sensed cardiac signal and the sensing threshold in response to the sensed R-wave; andsetting the sensing vector metric in response to the determined signal differences.3. The method of claim 2 , wherein selecting a sensing vector comprises:selecting a vector of the plurality of vectors having the lowest determined signal difference as a first sensing vector; andselecting a vector of the plurality of vectors having the next lowest determined signal difference as a second sensing vector.4. The method of claim 1 , wherein determining a morphology metric ...

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Номер записи: 91
29-10-2015 дата публикации

Method and apparatus for adjusting a blanking period for selecting a sensing vector configuration in a medical device

Номер: US20150305639A1
Автор: Robert W. Stadler, Saul E. Greenhut, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A method and medical device for determining sensing vectors that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors, setting a blanking period and a blanking period adjustment window for the plurality of sensing vectors in response to the sensed cardiac signals, determining first signal differences during the blanking period adjustment window, and adjusting the blanking period in response to the determined first signal differences.

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Номер записи: 92
29-10-2015 дата публикации

IMPLANTABLE MEDICAL DEVICE (IMD) SENSING MODIFICATIONS RESPONSIVE TO DETECTED PACING PULSES

Номер: US20150305640A1
Автор: Hansen Daniel L., Hareland Scott A., Nikolski Vladimir P., Reinke James D., Salmi Donna M., Sharma Vinod, Terry Michael B., ZHANG Xusheng
Принадлежит:

In situations in which an implantable medical device (IMD) (e.g., an extravascular ICD) is co-implanted with a leadless pacing device (LPD), it may be important that the IMD knows when the LPD is delivering pacing, such as anti-tachycardia pacing (ATP). Techniques are described herein for detecting, with the IMD and based on the sensed electrical signal, pacing pulses and adjusting operation to account for the detected pulses, e.g., blanking the sensed electrical signal or modifying a tachyarrhythmia detection algorithm. In one example, the IMD includes a pace pulse detector that detects, based on the processing of sensed electrical signals, delivery of a pacing pulse from a second implantable medical device and blank, based on the detection of the pacing pulse, the sensed electrical signal to remove the pacing pulse from the sensed electrical signal. 1. An implantable medical device comprising:a sensing channel that includes a plurality of components that process electrical signals sensed on an implantable electrical lead coupled to the implantable medical device;a pace pulse detector that detects pacing pulses delivered by a second implantable medical device based on the processing of the electrical signals sensed on the implantable electrical lead;a blanking module; anda blanking control module configured to, in response to pace pulse detector detecting the pacing pulse, cause the blanking module to blank the electrical signal of the sense channel to remove the pacing pulse from the sensed electrical signal.2. The device of claim 1 , wherein the pace pulse detector detects pacing pulses having amplitudes greater than or equal to four (4) millivolts and a pulse width of at least one (1) millisecond.3. The device of claim 1 , the blanking module holds the sensed electrical signal at a value of the sensed electrical signal prior to the pacing pulse to remove the pacing pulse from the sensed electrical signal.4. The device of claim 3 , wherein the blanking module ...

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Номер записи: 93
29-10-2015 дата публикации

IMPLANTABLE CARDIOVERTER-DEFIBRILLATOR (ICD) TACHYARRHYTHMIA DETECTION MODIFICATIONS RESPONSIVE TO DETECTED PACING

Номер: US20150305641A1
Автор: Reinke James D., Schmid Barbara J., Sharma Vinod, Stadler Robert W., ZHANG Xusheng
Принадлежит:

An implantable medical device comprises a sensing module configured to obtain electrical signals from one or more electrodes and a control module configured to process the electrical signals from the sensing module in accordance with a tachyarrhythmia detection algorithm to monitor for a tachyarrhythmia. The control module detects initiation of a pacing train delivered by a second implantable medical device, determines a type of the detected pacing train, and modifies the tachyarrhythmia detection algorithm based on the type of the detected pacing train. 1. A method comprising:detecting, with an extravascular implantable medical device (IMD), initiation of a pacing train delivered by a second implantable medical device;determining a type of the detected pacing train; andmodifying a tachyarrhythmia detection algorithm based on the type of the detected pacing train.2. The method of claim 1 , wherein determining a type of the detected pacing train comprises:estimating a cycle length of the pacing train;comparing the estimated cycle length of the pacing train to at least one cycle length threshold; anddetermining a type of the detected pacing train based on the comparison.3. The method of claim 1 , wherein determining a type of the detected pacing train comprises analyzing one or more of an onset of the heart rate immediately prior to the detected pacing train claim 1 , a regularity of the pacing pulse intervals claim 1 , a consistency of the pacing artifact amplitude claim 1 , a consistency of the pacing pulse slew rate claim 1 , and/or a consistency of the pacing pulse polarity.4. The method of claim 1 , further comprising:obtaining an electrical signal sensed on an implantable electrical lead coupled to the IMD; andanalyzing at least one of an amplitude and a slew rate of the electrical signal to detect pacing pulses in the electrical signal, wherein detecting initiation of the pacing train comprises detecting initiation of the pacing train using the detected pacing ...

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Номер записи: 94
29-10-2015 дата публикации

PACE PULSE DETECTOR FOR AN IMPLANTABLE MEDICAL DEVICE

Номер: US20150305642A1
Автор: Hansen Daniel L., Hareland Scott A., Nikolski Vladimir P., Reinke James D., Salmi Donna M., Sharma Vinod, Terry Michael B., ZHANG Xusheng
Принадлежит:

In situations in which an implantable medical device (e.g., a subcutaneous ICD) is co-implanted with a leadless pacing device (LPD), it may be important that the subcutaneous ICD knows when the LPD is delivering pacing, such as anti-tachycardia pacing (ATP). Techniques are described herein for detecting, with the ICD and based on the sensed electrical signal, pacing pulses and adjusting operation to account for the detected pulses, e.g., blanking the sensed electrical signal or modifying a tachyarrhythmia detection algorithm. In one example, the ICD includes a first pace pulse detector configured to obtain a sensed electrical signal and analyze the sensed electrical signal to detect a first type of pulses having a first set of characteristics and a second pace pulse detector configured to obtain the sensed electrical signal and analyze the sensed electrical signal to detect a second type of pulses having a second set of characteristics. 1. An implantable medical device comprising:a first pace pulse detector configured to obtain a sensed electrical signal and analyze the sensed electrical signal to detect a first type of pulses having a first set of characteristics; anda second pace pulse detector configured to obtain the sensed electrical signal and analyze the sensed electrical signal to detect a second type of pulses having a second set of characteristics.2. The device of claim 1 , wherein the first set of characteristics is a first amplitude and the first pace pulse detector includes a first threshold detector that detects the first type of pulses when an amplitude of the sensed electrical signal is greater than or equal to the first amplitude claim 1 , andwherein the second set of characteristics is a second amplitude, the second amplitude being less than the first amplitude, and the second pace pulse detector includes a second threshold detector that detects the second type of pulses when the amplitude of the sensed electrical signal is greater than or equal to ...

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Номер записи: 95
29-10-2015 дата публикации

Method and apparatus for adjusting a blanking period during transitioning between operating states in a medical device

Номер: US20150306408A1
Автор: Robert W. Stadler, Saul E. Greenhut, Xusheng Zhang
Принадлежит: MEDTRONIC INC

A method and medical device for adjusting a blanking period that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors, determining whether to adjust a blanking period during a first operating state, advancing from the first operating state to a second operating state in response to the sensed cardiac signals, determining, while in the second operating state, whether the blanking period was adjusted while in the first operating state, and adjusting the blanking period while in the second operating state in response to the blanking period being adjusted while in the first operating state.

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Номер записи: 96
26-09-2019 дата публикации

METHOD AND APPARATUS FOR SELECTING A SENSING VECTOR CONFIGURATION IN A MEDICAL DEVICE

Номер: US20190290153A1
Автор: ZHANG Xusheng
Принадлежит:

A method and medical device for determining sensing vectors that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a plurality of sensing vectors, determining a sensing vector metric in response to the sensed cardiac signals, determining a morphology metric associated with a morphology of the sensed cardiac signals, determining vector selection metrics in response to the determined sensing vector metric and the determined morphology setting, and selecting a sensing vector of the plurality of sensing vectors in response to the determined vector selection metrics. 121-. (canceled)22: A method comprising:sensing a plurality of cardiac signals on a plurality of sensing vectors formed from a plurality of electrodes, each of the cardiac signals sensed on a respective one of the plurality of sensing vectors;determining, for each of the plurality of sensing vectors, a respective sensing vector metric of the respective sensed cardiac signal, wherein determining each of the sensing vector metrics comprises comparing an amplitude of the respective sensed cardiac signal to an amplitude threshold;determining, for each of the plurality of sensing vectors, a respective morphology metric associated with a morphology of the respective sensed cardiac signal;determining, for each of the plurality of sensing vectors, a respective vector selection metric based on at least the determined sensing vector metric and the determined morphology metric; andselecting a sensing vector of the plurality of sensing vectors based on at least the determined selection metrics.23: The method of claim 22 , wherein determining each of the respective morphology metrics associated with the morphology of the respective sensed cardiac signal comprises determining a count of pulses satisfying at least one narrow pulse criterion in the respective sensed cardiac signal.24: The method of claim 22 , wherein determining each of the respective morphology metrics ...

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Номер записи: 97
25-10-2018 дата публикации

SUPRAVENTRICULAR TACHYARRHYTHMIA DISCRIMINATION

Номер: US20180303368A1
Автор: Cao Jian, Liu Yuanzhen, ZHANG Xusheng
Принадлежит:

An implantable cardioverter defibrillator (ICD) performs a method that includes determining whether first criteria for detecting a ventricular tachyarrhythmia are met by a cardiac electrical signal. The ICD determines features from cardiac signal segment of a group of cardiac signal segments and determines whether a first portion of the features satisfy monomorphic waveform criteria and determines whether a second portion of the features satisfy supraventricular beat criteria. The ICD determines whether second criteria for detecting the ventricular tachyarrhythmia are met and withholds detecting of the ventricular tachyarrhythmia in response to the monomorphic waveform criteria and the supraventricular beat criteria being met. 1. An implantable cardioverter defibrillator (ICD) comprising:a therapy delivery circuit configured to generate an electrical stimulation therapy for delivery to a patient's heart;a sensing circuit configured to receive at least a first cardiac electrical signal via a sensing electrode vector; and determine whether first criteria for detecting a ventricular tachyarrhythmia are met by the first cardiac electrical signal;', 'determine a plurality of features from each one of a plurality of cardiac signal segments of the first cardiac electrical signal;', 'in response to the first criteria being met, determine whether a first portion of the plurality of features determined from each one of the plurality of cardiac signal segments satisfy monomorphic waveform criteria;', 'determine whether a second portion of the plurality of features determined from each one of the plurality of cardiac signal segments satisfy supraventricular beat criteria;', 'determine whether second criteria for detecting the ventricular tachyarrhythmia are met; withhold detecting of the ventricular tachyarrhythmia in response to both the monomorphic waveform criteria and the supraventricular beat criteria being satisfied; and', 'detect the ventricular tachyarrhythmia and ...

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Номер записи: 98
03-11-2016 дата публикации

CARDIAC RESYNCHRONIZATION THERAPY OPTIMIZATION BASED ON INTRACARDIAC IMPEDANCE AND HEART SOUNDS

Номер: US20160317817A1
Автор: Cho Yong Kyun, Hettrick Douglas, ZHANG Xusheng, Zielinski Todd M.
Принадлежит:

Methods and/or devices used in delivering cardiac resynchronization therapy based on a plurality of device parameters (e.g., A-V delay, V-V delay, etc.) are optimized by setting a device parameter based on selection data. The selection data may be acquired by acquiring temporal fiducial points (e.g., heart sounds) associated with at least a part of a systolic portion of at least one cardiac cycle and/or temporal fiducial points associated with at least a part of a diastolic portion of the at least one cardiac cycle for each of a plurality of electrode vector configurations, and extracting measurements from the intracardiac impedance signal acquired for each of a plurality of electrode vector configurations based on the temporal fiducial points. The acquired selection data may be scored and used to optimize the device parameter. 1. An implantable medical device for use in delivering therapy to a patient's heart comprising:a sensing module configured to monitor an intracardiac impedance between at least two electrodes to provide an intracardiac impedance signal and to monitor heart sounds of a patient;a therapy delivery module configured to deliver cardiac resynchronization therapy to the patient's heart; and [ sensing heart sounds defining temporal fiducial points associated with at least a diastolic portion of the at least one cardiac cycle for each of a plurality of electrode vector configurations,', 'acquiring, at each of the plurality of electrode vector configurations and about simultaneously with the sensed heart sounds, an intracardiac impedance signal,', 'extracting measurements from the intracardiac impedance signal for each of the plurality of electrode vector configurations based at least in part on the defined temporal fiducial points associated with the diastolic portion of the at least one cardiac cycle, and', 'determining selection data for each of the plurality of electrode vector configurations based on the extracted measurements; and, 'acquire ...

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Номер записи: 99
24-09-2020 дата публикации

ANTI-TACHYCARDIA PACING CONTROL IN AN IMPLANTABLE MEDICAL DEVICE SYSTEM

Номер: US20200298003A1
Автор: EBELING Timothy A., GRINBERG Yanina, Jackson Troy E., Nikolski Vladimir P., Solheim Paul R., ZHANG Xusheng
Принадлежит:

An implantable medical device system is configured to detect a tachyarrhythmia from a cardiac electrical signal and start an ATP therapy delay period. The implantable medical device determines whether the cardiac electrical signal received during the ATP therapy delay period satisfies ATP delivery criteria. A therapy delivery module is controlled to cancel the delayed ATP therapy if the ATP delivery criteria are not met and deliver the delayed ATP therapy if the ATP delivery criteria are met. 1. An implantable medical device system comprising:a sensing module configured to receive a cardiac electrical signal from a patient's heart via a sensing electrode vector and sense cardiac events from the cardiac electrical signal;a therapy delivery module configured to generate pulses for delivering an anti-tachycardia pacing (ATP) therapy to the patient's heart via a pacing electrode vector; and detect a tachyarrhythmia from the cardiac electrical signal;', 'start an ATP therapy delay period to delay the ATP therapy in response to detecting the tachyarrhythmia;', 'determine whether ATP delivery criteria are satisfied based on the cardiac electrical signal received by the sensing module during the ATP therapy delay period;', 'control the therapy delivery module to deliver the delayed ATP therapy in response to the ATP delivery criteria being satisfied; and', 'cancel the delayed ATP therapy in response to the ATP delivery criteria not being satisfied., 'a control module coupled to the sensing module and the therapy delivery module and configured to2. The system of claim 1 , wherein the control module is configured to determine whether the ATP delivery criteria are satisfied by:determining sensed cardiac event intervals during the ATP therapy delay period, each sensed cardiac event interval being determined as a time interval between a pair of consecutively sensed cardiac events sensed by the sensing module;comparing the sensed cardiac event intervals determined during the ATP ...

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Номер записи: 100
02-11-2017 дата публикации

SYSTEM AND METHOD FOR SENSING AND DETECTION IN AN EXTRA-CARDIOVASCULAR IMPLANTABLE CARDIOVERTER DEFIBRILLATOR

Номер: US20170312532A1
Автор: Cao Jian, Greenhut Saul E., Stadler Robert W., ZHANG Xusheng
Принадлежит:

An extra-cardiovascular implantable cardioverter defibrillator senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The ICD determines intervals between successively sensed R-waves and, in response to at least a predetermined number of the intervals being less than a tachyarrhythmia detection interval, analyzes at least a portion of the time segment of the second cardiac electrical signal corresponding to a most recent one of the sensed R-waves to confirm the most recent one of the R-waves. The ICD updates an unconfirmed beat count in response to the most recent one of the R-waves not being confirmed and withholds detection of a tachyarrhythmia episode in response to the unconfirmed beat count being equal to or greater than a rejection threshold. 1. An extra-cardiovascular implantable cardioverter defibrillator (ICD) , comprising: a first sensing channel configured to receive a first cardiac electrical signal via a first extra-cardiovascular sensing electrode vector coupled to the extra-cardiovascular ICD and to sense a first plurality of R-waves in response to crossings of a first R-wave sensing threshold by the first cardiac electrical signal, and', 'a second sensing channel configured to receive a second cardiac electrical signal via a second extra-cardiovascular sensing electrode vector coupled to the extra-cardiovascular ICD and different than the first extra-cardiovascular sensing electrode vector;, 'a sensing circuit comprisinga memory; and store a time segment of the second cardiac electrical signal in the memory in response to each one of the first plurality of R-waves sensed by the first sensing channel;', 'determine a first plurality of intervals between successive ones of the first plurality of R-waves sensed by the first sensing channel;', 'in response to at least a first predetermined number of the first plurality of intervals ...

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Номер записи: 101
02-11-2017 дата публикации

Multi-threshold sensing of cardiac electrical signals in an extracardiovascular implantable cardioverter defibrillator

Номер: US20170312534A1
Автор: Gerald P. Arne, Irving J. SANCHEZ, Jian Cao, Michael W. Heinks, Paul R. Solheim, Saul E. Greenhut, Timothy A. EBELING, Xusheng Zhang
Принадлежит: MEDTRONIC INC

An implantable medical device system capable of sensing cardiac electrical signals includes a sensing circuit, a therapy delivery circuit and a control circuit. The sensing circuit is configured to receive a cardiac electrical signal and sense a cardiac event in response to the signal crossing a cardiac event sensing threshold. The therapy delivery circuit is configured to deliver an electrical stimulation therapy to a patient's heart via the electrodes coupled to the implantable medical device. The control circuit is configured to control the sensing circuit to set a starting value of the cardiac event sensing threshold and hold the starting value constant for a sense delay interval. The control circuit is further configured to detect an arrhythmia based on cardiac events sensed by the sensing circuit and control the therapy delivery circuit to deliver the electrical stimulation therapy in response to detecting the arrhythmia.

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Номер записи: 102