Flow path sensing for flow therapy apparatus

Deterministically controlled humidification system

A respiratory humidification system for providing heated and humidified respiratory gases to a patient comprising a liquid flow controller 110 providing a controlled flow of a liquid and a heating system including a heating surface 114 configured to receive the controlled flow of liquid. The system comprises one or more temperature sensors measuring a surface temperature of the heating surface and one or more liquid sensors 117 configured to detect whether the heating surface is wetted in at least one region. The system comprises one or more hardware processors providing deterministic control of a humidity level of gases passing through the system by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system and instructing the heating system to adjust the surface temperature of the heating surface. Adjusting the surface temperature of the heating surface provides control to produce a known evaporative area. A heater plate is also provided ...

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient.

Respiratory assistance apparatus

A respiratory assistance apparatus comprising a gases inlet or inlets, a supplemental gas connection inlet, a blower unit configured to generate a pressurised gases stream, a humidification unit 14, a gases outlet for the heated and humidified gases stream and a flow path for the gases stream through the respiratory assistance apparatus from the gases inlet(s) through the blower unit and humidification unit 14 to the gases outlet, has a sensor assembly 60 in a flow path of the apparatus which comprises a housing having at least one sensor for sensing at least one characteristic of the gas stream, with the housing being a modular component which is releasably mounted within the flow path so that it may be removed for replacement, maintenance or repair. The sensor housing is configured to be received and retained within a mounting aperture of the flow path via a friction fit, or a clipping system, a latching system, by snap-fit or other releasable configurations.

Deterministically controlled humidification system

Respiratory assistance apparatus

Respiratory assistance apparatus

A respiratory assistance apparatus comprises a gases inlet or inlets, a supplemental gas connection inlet, a blower unit configured to generate a pressurised gases stream, a humidification unit 14, a gases outlet for the heated and humidified gases stream, a flow path for the gases stream through the respiratory assistance apparatus from the gases inlet(s) through the blower unit and humidification unit 14 to the gases outlet, a sensor assembly 60 comprising an ultrasound gas composition sensor system for sensing oxygen concentration within the gases stream, a controller operatively connected to the sensor assembly and which generates a representative oxygen concentration signal indicative of the oxygen fraction of the binary gas mixture, the controller configured to adjust a valve operable to alter or modify the flow rate of the supply of supplemental oxygen, based on the oxygen concentration signal.

Respiratory assistance apparatus

A respiratory assistance apparatus incorporates an ultrasound gas composition sensor system 60,220 comprising a pair of transmitter-receiver transducers or transceivers 222,224 configured to transmit bi-directional ultrasonic acoustic pulses 210 through a gases stream to determine the speed of sound of the gases stream as a basis for a controller operatively connected to the transmitter-receiver transducers to generate signals indicative of gas concentrations within the gases stream. The apparatus is configured to provide a heated and humidified gases stream of a binary gas mixture of atmospheric air blended with supplemental nitrogen and comprising gases inlets of the atmospheric air and supplemental nitrogen, a blower unit configured to pressurise the gases stream, a humidification unit 14 configured to heat and humidify the gases stream, and a flow path for the gases stream through the respiratory device from the gases inlet through the blower unit and humidification unit to a gases ...

Deterministically controlled humidification system

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

Flow path sensing for flow therapy apparatus

Flow path sensing for flow therapy apparatus

Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling.

Breathing assistance apparatus

Respiratory assistance apparatus

Respiratory assistance apparatus

Respiratory assistance apparatus

Flow path sensing for flow therapy apparatus

A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow.

Respiratory assistance apparatus

A respiratory assistance apparatus incorporates an ultrasound gas composition sensor system 60,220 comprising a pair of transmitter-receiver transducers or transceivers 222,224 configured to transmit bi-directional ultrasonic acoustic pulses 210 through a gases stream to determine the speed of sound of the gases stream as a basis for a controller operatively connected to the transmitter-receiver transducers to generate signals indicative of gas concentrations within the gases stream. The apparatus is configured to provide a heated and humidified gases stream of a binary gas mixture of atmospheric air blended with supplemental gas and comprising gases inlets of the atmospheric air and a supplemental gas, a blower unit configured to pressurise the gases stream, a humidification unit 14 configured to heat and humidify the gases stream, and a flow path for the gases stream through the respiratory device from the gases inlet through the blower unit and humidification unit to a gases outlet.

BREATHING ASSISTANCE APPARATUS

An apparatus for delivering a flow of gas has a housing and a humidifier. The housing has a recess for a motor and/or sensor module, an outlet port for a flow of gas, and a removable elbow for a flow of gas. The humidifier has a heater, a chamber bay for receipt of a liquid chamber, and a lever and/or detent(s) for assisting with insertion and/or retention and/or removal of the liquid chamber in and/or from the chamber bay.

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

FLOW PATH SENSING FOR FLOW THERAPY APPARATUS

A respiratory flow therapy apparatus including a sensor module can measure a flow rate of gases or gases concentration provided to a patient. The sensor module can be located after a blower and/or mixer. The sensor module can include at least an ultrasonic transmitter, a receiver, a temperature sensor, a pressure sensor, a humidity sensor and/or a flow rate sensor. The receivers can be immersed in the gases flow path. The receivers can cancel delays in the transmitters and improve accuracy of measurements of characteristics of the gases flow. The receivers can allow for detection of a fault condition in a blower motor of the apparatus. 1. A respiratory assistance system for providing a flow of gases to a patient , the system comprising:a first acoustic transmitter positioned at a first position in or near a gases flow path, the first acoustic transmitter configured to transmit a first acoustic signal;a second acoustic transmitter positioned at a second position in or near the gases flow path, the second acoustic transmitter configured to transmit a second acoustic signal; andone or more acoustic receivers positioned between the first position and the second position, the one or more acoustic receivers configured to receive the first and the second transmitted acoustic signals,wherein the acoustic transmitters and the one or more acoustic receivers are in electrical communication with a hardware processor configured to determine one or more characteristics of the gases flow based on the received first and second acoustic signals.2. The respiratory assistance system of claim 1 , wherein the one or more acoustic receivers comprise two acoustic receivers.3. The respiratory assistance system of claim 2 , wherein one acoustic receiver is downstream of another acoustic receiver.4. The respiratory assistance system of any of - claim 2 , wherein the first and second acoustic transmitters face each other along the gases flow path so that acoustic signals produced by each ...

FLUID MIXING STRUCTURE

A respiratory therapy system can have a flow generator adapted to provide gases to a patient. A gas passageway can be located in-line with the flow generator. The gas passageway can have a first portion adapted to receive a first gas and a second portion adapted to receive a second gas. The gas passageway can have a static mixer downstream of the first and second portions. 146.-. (canceled)47. A static flow mixer configured to mix multiple gases comprising:an inlet configured to receive at least two gases;an outlet;a first baffle positioned between the inlet and the outlet; anda pinch defined between a downstream edge of the first baffle and a nearest downstream surface, wherein a length of the pinch is less than a height of the first baffle,wherein, in use, gases exiting the static mixer are substantially uniformly mixed.48. The static flow mixer of claim 47 , wherein the first baffle extends at a first angle relative to horizontal upward and downstream relative to gases entering the inlet in use.49. (canceled)50. (canceled)51. (canceled)52. The static flow mixer of claim 47 , wherein in use the first baffle causes a gas flow through the static flow mixer to move upwards and then sharply turn at the downstream edge of the first baffle.53. The static flow mixer of claim 47 , further comprising a second baffle positioned between the first baffle and the outlet claim 47 , wherein the pinch is defined by a line extending from the downstream edge of the first baffle to an upstream face of the second baffle and extending perpendicularly to the upstream face of the second baffle.54. (canceled)55. (canceled)56. The static flow mixer of claim 53 , wherein the second baffle extends at a second angle relative to horizontal downward and downstream relative to the gases entering the inlet in use.57. (canceled)58. (canceled)59. (canceled)60. The static flow mixer of claim 53 , wherein in use the second baffle causes a gas flow through the static flow mixer to move downwards and ...

THERMISTOR FLOW SENSOR HAVING MULTIPLE TEMPERATURE POINTS

A gases flow rate sensing system may be configured to operate in at least two different target temperature modes, based upon a measured temperature of the gases flow. In some embodiments, the gases flow sensing system may have a voltage divider containing a thermistor. The gases flow rate may be determined based upon a voltage output indicating an amount of power needed to maintain the thermistor at a target temperature as specified by the target temperature mode, and a measured temperature of the gases flow.

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202 ′ with a recess, and an outlet port 3210 ′ for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

FLOW PATH SENSING FOR FLOW THERAPY APPARATUS

A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow. 1. A flow therapy apparatus comprising:an inlet port which receives a flow of gases from at least two different gas sources;a blower which receives the flow of gases from the inlet port, the blower configured to mix the flow of gases from the at least two different gas sources to produce mixed gases;a gases flow path which receives the mixed gases from the blower and directs the gases flow through a sensor chamber; andone or more sensors configured to measure a property of the flow of gases flowing through the gases flow path, wherein at least one of the one or more sensors is located downstream of the blower.2. The apparatus of claim 1 , wherein at least one of the at least two different gas sources comprises oxygen gas and wherein the inlet port comprises a valve configured to deliver a flow of the oxygen gas to the blower.3. The apparatus of claim 2 , wherein the valve comprises a proportional valve.4. The apparatus of any of - claim 2 , wherein the sensors comprise two or more ultrasonic transducers.5. The apparatus of any of - claim 2 , wherein the sensors comprise a gas concentration sensor.6. The apparatus of any of - claim 2 , wherein sensors comprise two or more ultrasonic transducers and the ultrasonic transducers are configured to determine a gas concentration.7. The apparatus of any of - claim 2 , wherein the ultrasonic transducers are configured to determine a flow rate.8. The apparatus of any of - claim 2 , wherein the sensors comprise a heated temperature sensing ...

FLOW PATH SENSING FOR FLOW THERAPY APPARATUS

Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling. 1. A method for conducting respiratory therapy in a respiratory system , comprising:driving a blower motor using a control signal, the blower motor configured to generate an air flow to a patient; receiving a first sensor input comprising one or more flow measurements from at least one flow sensor;', 'receiving a second sensor input comprising one or more pressure measurements from at least one pressure sensor or one or more motor speed measurements associated with the blower motor;', 'generating a breath cycle waveform using at least the received one or more flow measurements, wherein the breath cycle waveform comprises a plurality of alternating inspiration and expiration periods by the patient; and', identifying a phase of the breath cycle waveform, and', "iteratively updating a phase of the control signal to achieve a determined phase difference between the control signal and the breath cycle waveform, such that the control signal is configured to adjust a speed of the blower motor based upon the patient's inspiration and expiration."], 'synchronizing the control signal with the breath cycle by], 'detecting a breath cycle of the patient by2. The method of claim 1 , further comprising phase-shifting the control signal based upon a system delay between the control signal being received by the blower motor ...

THERMISTOR FLOW SENSOR HAVING MULTIPLE TEMPERATURE POINTS

A gases flow rate sensing system may be configured to operate in at least two different target temperature modes, based upon a measured temperature of the gases flow. In some embodiments, the gases flow sensing system may have a voltage divider containing a thermistor. The gases flow rate may be determined based upon a voltage output indicating an amount of power needed to maintain the thermistor at a target temperature as specified by the target temperature mode, and a measured temperature of the gases flow. 1. A breathing assistance apparatus that provides a flow of gases to a patient , the breathing assistance apparatus comprising:at least one gases flow path configured to direct the flow of gases to the patient;a gases flow inlet configured to receive the flow of gases from a gases flow source;a temperature sensor configured to measure a temperature of the gases flow; anda gases flow rate sensing system configured to measure a gases flow rate of the flow of gases, wherein the gases flow rate sensing system is configured to operate in at least two different temperature modes, based upon the measured temperature of the gases flow.2. The breathing assistance apparatus of claim 1 , wherein the gases flow source comprises a blower.3. The breathing assistance apparatus of claim 2 , wherein the temperature sensor and/or the gases flow rate sensing system are upstream of the blower.4. The apparatus of any of - claim 2 , wherein the temperature sensor and/or the gases flow rate sensing system are comprised within a sensor assembly having a housing claim 2 , the sensor assembly located in a sensor zone within an inlet flow path prior to the blower.5. The breathing assistance apparatus of claim 2 , wherein the temperature sensor and/or the gases flow rate sensing system are downstream of the blower.6. The apparatus of or claim 2 , wherein the blower is comprised within a blower/sensor module.7. The apparatus of claim 6 , wherein the blower/sensor module is removable and ...

DETERMINISTICALLY CONTROLLED HUMIDIFICATION SYSTEM

A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system. 1. A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient , the respiratory humidification system comprising:a liquid flow controller for providing a controlled flow of liquid;a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, the heating system configured to maintain the heating surface at a temperature of between approximately 30° C. and approximately 99.9° C.; andone or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system based on a flow rate of gases through the gases passage way, and the evaporation rate of said controlled flow of liquid from the heating surface.2. The respiratory humidification system of claim 1 , wherein the liquid flow controller comprises a metering system.3. The respiratory humidification system of claim 1 , wherein the liquid flow ...

RESPIRATORY ASSISTANCE APPARATUS

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream. 1. (canceled)2. A respiratory assistance apparatus configured to provide a heated and humidified gases stream , the respiratory assistance apparatus comprising:a main housing comprising:a gases inlet(s) configured to receive one or more gases to form a gases stream;a blower unit configured to pressurise the gases stream;a humidification unit configured to heat and humidify the gases stream;a gases outlet following the blower unit and humidification unit for the gases stream; anda sensor assembly in a flow path of the gases stream through the main housing, the sensor assembly comprising a sensor housing that is a modular component and releasably mounted within the flow path, and wherein the sensor housing comprises an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.3. A respiratory assistance apparatus according to claim 2 , wherein the flow path is for the gases stream through the main housing from the gases inlet(s) through the blower unit and the humidification unit to the gases outlet.4. A respiratory assistance apparatus according to claim 3 , wherein the flow path is in a bulk flow path of the respiratory assistance apparatus.5. A respiratory assistance apparatus according to claim 4 , wherein the sensor ...

RESPIRATORY ASSISTANCE APPARATUS

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream. 1. (canceled)2. A respiratory assistance apparatus configured to provide a heated and humidified gases stream comprising a binary gas mixture of atmospheric air blended with supplemental oxygen , the apparatus comprising:at least one gases inlet configured to receive atmospheric air;a supplemental gas connection inlet configured to receive a supply of oxygen from a supplemental gas supply for blending the oxygen with the atmospheric air to form a gases stream comprising the binary gas mixture and having a flow rate;a blower unit configured to pressurize the gases stream;a humidification unit configured to heat and humidify the gases stream;a gases outlet configured to receive the gases stream after heating, humidifying, and pressurizing the gases stream;a flow path configured to receive the gases stream, the flow path extending from the at least one gases inlet through the blower unit and the humidification unit to the gases outlet;a sensor assembly comprising an ultrasound gas composition sensor system for sensing oxygen concentration of the gases stream;a controller operatively connected to the sensor assembly, wherein the controller is configured to generate a representative oxygen concentration signal indicative of an oxygen fraction of the gases stream from the ...

DETERMINISTICALLY CONTROLLED HUMIDIFICATION SYSTEM

A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system. 1. A respiratory humidification system for providing heated and humidified respiratory gases to a patient , the respiratory humidification system comprising:a liquid flow controller providing a controlled flow of liquid;a heating system including a heating surface configured to receive the controlled flow of liquid and provide humidification to gases passing through the humidification system;one or more temperature sensors measuring a surface temperature of the heating surface;one or more hardware processors providing deterministic control of a humidity level of gases passing through the respiratory humidification system by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system and instructing the heating system to adjust the surface temperature of the heating surface, wherein adjusting the surface temperature of the heating surface provides control to produce a known evaporative area; andone or more sensors configured to detect whether the heating surface is wetted in at least one region.2. The respiratory humidification system of claim 1 , wherein the one or more sensors are liquid sensors.3. The respiratory humidification system of claim 1 , wherein the one or ...

Respiratory assistance apparatus

A respiratory assistance apparatus ( 4 ) is provided, adapted to deliver gases to a user or patient ( 1 ). The apparatus ( 4 ) comprises a housing ( 10 ) provided with a chamber ( 5 ) and a heater ( 25 ), the chamber ( 5 ) comprising at least one gas port ( 15 ) connected to, or arranged to be connected to, at least one intermediate passageway ( 12 ). The apparatus ( 4 ) is operative according to a disinfection mode of predetermined profile in which the heater ( 25 ) heats liquid in the chamber ( 5 ) to produce vapour at or above a target dewpoint temperature and/or humidity level. The apparatus ( 4 ) is arranged such that the vapour is delivered to the intermediate passageway ( 12 ) to disinfect the intermediate passageway ( 12 ) with moist heat throughout a predetermined duration of the disinfection mode. Associated attachments and methods are also provided.

RESPIRATORY ASSISTANCE APPARATUS

A respiratory assistance apparatus () is provided, adapted to deliver gases to a user or patient (). The apparatus () comprises a housing () provided with a chamber () and a heater (), the chamber () comprising at least one gas port () connected to, or arranged to be connected to, at least one intermediate passageway (). The apparatus () is operative according to a disinfection mode of predetermined profile in which the heater () heats liquid in the chamber () to produce vapour at or above a target dewpoint temperature and/or humidity level. The apparatus () is arranged such that the vapour is delivered to the intermediate passageway () to disinfect the intermediate passageway () with moist heat throughout a predetermined duration of the disinfection mode. Associated attachments and methods are also provided. 1. A respiratory assistance apparatus adapted to deliver a gases flow to a user or patient , the apparatus comprising:a housing provided with or configured to receive a chamber and a heater, the chamber comprising at least one chamber port connected to, or arranged to be connected to, at least one intermediate passageway,wherein the apparatus is operative according to a disinfection mode of predetermined profile in which the heater heats a liquid in the chamber to produce vapour or steam at or above a target dewpoint temperature, andwherein the apparatus is arranged such that vapour is delivered to the intermediate passageway to disinfect the intermediate passageway with moist heat, the vapour being at or above the target dewpoint temperature and continuing to be delivered to the intermediate passageway throughout the predetermined duration of the disinfection mode.2. The apparatus of claim 1 , wherein the at least one chamber port comprises a chamber inlet port and a chamber outlet port claim 1 , the chamber inlet port being arranged to be in fluid communication in use with a gases source in the housing.3. The apparatus of or claim 1 , wherein the chamber ...

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases 5 outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Flow path sensing for flow therapy apparatus

A gas delivery system has sensors to measure the properties of gases in its flow path. A first barometric pressure sensor is arranged to measure the ambient pressure. A second pressure sensor 2209 detects the absolute pressure in the flow path. A controller 2207 receives data from both sensors and uses it to calculate a differential pressure. The controller adjusts the motor speed of a blower based on the differential pressure to match the gas flow to a patient’s breathing. The second pressure sensor may be located downstream of the blower. The controller may determine the accuracy of a sensor by comparing mass flow rate (measured by a heated temperature sensing element such as a hot-wire anemometer) and volumetric flow rate (measured using ultrasonic transducers). The pressure measurements may be used to calculate limits for detecting blockage and leakage at different altitudes.

Deterministically controlled humidification system

A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system.

Breathing assistance apparatus

Flow path sensor for flow therapy devices

Los sistemas y métodos para realizar la terapia respiratoria en un sistema respiratorio pueden ajustar un flujo de gases respiratorios a un paciente basándose en un ciclo de respiración del paciente detectado. El sistema respiratorio puede incluir una interfaz de paciente no sellada. El sistema respiratorio se puede configurar para administrar una terapia de alto flujo. El ciclo de respiración de un paciente puede determinarse utilizando uno o más parámetros medidos, como un caudal, una velocidad del motor del ventilador y/o una presión del sistema. Una fuente de flujo puede ajustarse para que tenga una fase que coincida con la del ciclo de respiración del paciente, de modo que el flujo aumente en respuesta a la inhalación del paciente y disminuya en respuesta a la exhalación del paciente. (Traducción automática con Google Translate, sin valor legal) Systems and methods for performing respiratory therapy in a respiratory system may adjust a flow of respiratory gases to a patient based on a detected patient's breathing cycle. The respiratory system may include a non-sealed patient interface. The respiratory system can be configured to deliver high flow therapy. A patient's breathing cycle can be determined using one or more measured parameters, such as flow rate, ventilator motor speed, and/or system pressure. A flow source can be set to have a phase that matches that of the patient's breath cycle, such that the flow increases in response to the patient's inhalation and decreases in response to the patient's exhalation. (Automatic translation with Google Translate, without legal value)

Thermistor flow sensor having multiple temperature points

A gases flow rate sensing system may be configured to operate in at least two different target temperature modes, based upon a measured temperature of the gases flow. In some embodiments, the gases flow sensing system may have a voltage divider containing a thermistor. The gases flow rate may be determined based upon a voltage output indicating an amount of power needed to maintain the thermistor at a target temperature as specified by the target temperature mode, and a measured temperature of the gases flow.

Respiratory assistance apparatus

Deterministically controlled humidification system

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Flow path sensing for flow therapy apparatus

Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling.

Respiratory assist device

Un aparato de asistencia respiratoria (10, 10', 3010') para suministrar un flujo de gas, que comprende: una carcasa principal del aparato (100, 100') con un rebaje (250, 3250) para recibir o contener un módulo de motor (400, 1400, 2400), y un paso de flujo de gas (264, 3264) desde el rebaje y que está en comunicación fluida con un orificio de salida (322, 1322) para un flujo de gas, en donde el rebaje (250, 3250) está definido por al menos una pared (252, 262, 3256, 3262) de la carcasa principal del aparato que es sustancialmente continua, impermeable al gas e ininterrumpida, distinta al paso de flujo de gas (264, 3264) desde el rebaje, en donde un interior de la carcasa principal del aparato (100, 100') comprende componentes eléctricos y/o electrónicos, y en donde la al menos una pared (252, 262, 3256, 3262) del rebaje (250, 3250) está configurada para aislar neumáticamente los componentes eléctricos y/o electrónicos del flujo de gas a través del módulo del motor (400, 1400, 2400) o desde el mismo, en donde el aparato comprende una entrada (350, 356') para suministrar gases al módulo de motor (400, 1400, 2400) en el rebaje, en donde el rebaje comprende una abertura del rebaje (251) en una pared exterior (30, 3230) de la carcasa principal del aparato, en donde la abertura del rebaje (251) sirve para recibir un módulo de motor, y en donde el rebaje (250, 3250) se extiende dentro de la carcasa principal del aparato (100, 100') desde la abertura del rebaje (251), en donde la pared exterior (30, 3230) es una pared inferior, caracterizado por que: dicha al menos una pared (252, 262, 3256, 3262) que define el rebaje está formada integralmente con dicha pared inferior. A respiratory assistance apparatus (10, 10 ', 3010') for supplying a flow of gas, comprising: a main casing of the apparatus (100, 100 ') with a recess (250, 3250) to receive or contain a module of engine (400, 1400, 2400), and a gas flow passage (264, 3264) from the ...

Thermistor flow sensor having multiple temperature points

A gases flow rate sensing system may be configured to operate in at least two different target temperature modes, based upon a measured temperature of the gases flow. In some embodiments, the gases flow sensing system may have a voltage divider containing a thermistor. The gases flow rate may be determined based upon a voltage output indicating an amount of power needed to maintain the thermistor at a target temperature as specified by the target temperature mode, and a measured temperature of the gases flow.

Thermistor flow sensor having multiple temperature points

A gases flow rate sensing system may be configured to operate in at least two different target temperature modes, based upon a measured temperature of the gases flow. In some embodiments, the gases flow sensing system may have a voltage divider containing a thermistor. The gases flow rate may be determined based upon a voltage output indicating an amount of power needed to maintain the thermistor at a target temperature as specified by the target temperature mode, and a measured temperature of the gases flow.

Respiratory assistance apparatus

ABSTRACT A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Respiratory support device

Eine atmungsunterstützende Vorrichtung weist einen Gaseinlass, der ausgelegt ist, eine Zufuhr von Gasen zu empfangen, eine Gebläseeinheit, die ausgelegt ist, einen Strom von unter Druck gesetzten Gasen von der Zufuhr von Gasen zu erzeugen; eine Befeuchtungseinheit, die ausgelegt ist, den Strom von unter Druck gesetzten Gasen zu erwärmen und zu befeuchten; und einen Gasauslass für den erwärmten und befeuchteten Gasstrom auf. Ein Strömungsweg für den Gasstrom erstreckt sich durch die Beatmungsvorrichtung vom Gaseinlass durch die Gebläseeinheit und die Befeuchtungseinheit zum Gasauslass. Eine Sensoranordnung ist im Strömungsweg vor der Befeuchtungseinheit bereitgestellt. Die Sensoranordnung weist ein Ultraschallsensorsystem für die Gaszusammensetzung auf, um eine oder mehrere Gaskonzentrationen innerhalb des Gasstroms abzufühlen.

Thermistor flow sensor having multiple temperature points

A breathing assistance apparatus that provides a flow of gases to a patient, the breathing assistance apparatus comprising: a temperature sensor configured to measure a temperature of the flow of gases; and a gases flow rate sensing system configured to measure a gases flow rate of the flow of gases, wherein the gases flow rate sensing system is configured to operate in a first mode based on the measured temperature of the flow of gases being in a first temperature sub range defined by a first temperature value and a second temperature value, the second temperature value being greater than the first temperature value, and wherein the gases flow rate sensing system is configured to operate in a second mode based on the measured temperature of the flow of gases being in a second temperature sub range defined by a third temperature value and a fourth temperature value, the fourth temperature value being greater than the third temperature value, the third temperature value being less than the second temperature value and greater than the first temperature value. WO 2018/052320 PCT/NZ2017/050119 1111 0 01

Breathing assistance apparatuses and/or components thereof and/or uses thereof

Disclosed is an apparatus configured to operate in at least one therapy mode and at least one non-therapy mode. After a predetermined time operating in the at least one non-therapy mode, the apparatus is configured to: transmit the data to a device, and/or receive a software package from a or the device, and/or receive therapy parameters from a or the device, and/or update parameters of the apparatus.

A respiratory apparatus and control methods

A respiratory apparatus that is configured to provide a flow of gases to a user for respiratory therapy. A flow generator is operable to generate a flow of gases. A controller is operable to control one or more properties of the flow of gases provided to the user by controlling a motor speed of the flow generator. The controller is configured to receive one or more input therapy settings that represents one or more properties desired for the generated flow of gases during a therapy session. The controller predicts if a steady-state temperature of the apparatus will exceed a high-temperature-condition threshold, based at least partly on input therapy setting(s) and a heat model of the apparatus. The controller may generate an alarm and/or initiate an alarm response counteraction control measure in response to the prediction to reduce the risk of the apparatus exceeding the high-temperature-condition threshold,.

Deterministically controlled humidification system

EDITORIAL NOTE APPLICATION NUMBER - 2022201861 Please note: Abstract page -96- should be numbered -87-. ABSTRACT A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system. -96-

Flow path sensing for flow therapy apparatus

A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow.

Improved respiratory support apparatus

A respiratory support system can be configured to automatically mitigate a risk of patient discomfort and/or harm associated with the flow of heated, humidified gases provided to a patient. The system includes a humidifier unit which holds and heats a volume of water, and which receives a flow of gases via an inlet port. The flow of gases passes through the humidifier and exits via an exit port. The system also includes a controller which receives data from various sensors in the system, and which can control heating of a heater plate in the humidifier. The control output is configured to adjust the maximum power limit to the heater plate to prevent dangerous enthalpy levels and/or dew points of the gases leaving the patient interface.

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Breathing assistance apparatuses and/or components thereof and/or uses thereof

Disclosed is an apparatus configured to operate in at least one therapy mode and at least one non-therapy mode. After a predetermined time operating in the at least one non-therapy mode, the apparatus is configured to: transmit the data to a device, and/or receive a software package from a or the device, and/or receive therapy parameters from a or the device, and/or update parameters of the apparatus.

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than a gasflow passage from the recess to the outlet port of the housing.

フロー療法装置用の流路検知

【課題】患者に提供されるガス流を測定する検知チャンバを含む呼吸フロー療法装置を提供する。【解決手段】検知チャンバは、ブロワおよびミキサの後に配置することができる。検知チャンバは、超音波トランスデューサ、温度センサ、加熱温度検知素子および／またはガス濃度センサを含むことができる。センサシステムとともに使用されるガスの流路は、測定流における異常をもたらす可能性があるガス流の望ましくない渦運動を防止する。【選択図】図１

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases 5 outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Deterministically controlled humidification system

A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system. -96-

Deterministically controlled humidification system

A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system.

Breathing assistance apparatuses and/or components thereof and/or uses thereof

Disclosed is an apparatus configured to operate in at least one therapy mode and at least one non-therapy mode. After a predetermined time operating in the at least one non-therapy mode, the apparatus is configured to: transmit the data to a device, and/or receive a software package from a or the device, and/or receive therapy parameters from a or the device, and/or update parameters of the apparatus.

Closed loop oxygen control

Breathing assistance apparatus

An apparatus for delivering a flow of gas, has a housing 3202' with a recess, and an outlet port 3210' for a flow of gas. The recess is defined by at least one wall 3256, 3262 that is substantially continuous, gas impermeable, and unbroken, other than 5 a gasflow passage from the recess to the outlet port of the housing.

Improved respiratory support apparatus

A respiratory support system can be configured to automatically mitigate a risk of patient discomfort and/or harm associated with the flow of heated, humidified gases provided to a patient. The system includes a humidifier unit which holds and heats a volume of water, and which receives a flow of gases via an inlet port. The flow of gases passes through the humidifier and exits via an exit port. The system also includes a controller which receives data from various sensors in the system, and which can control heating of a heater plate in the humidifier. The control output is configured to adjust the maximum power limit to the heater plate to prevent dangerous enthalpy levels and/or dew points of the gases leaving the patient interface.

Flow path sensing for flow therapy apparatus

Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling.

Flow path sensing for flow therapy apparatus

OF THE DISCLOSURE Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling. -52-

フロー療法装置のための流路感知

【課題】検出された患者の呼吸サイクルに基づいて患者への呼吸ガスのフローを調整することができる呼吸療法を実施するためのシステムおよび方法を提供する。 【解決手段】呼吸システムにおいて呼吸療法を実施するためのシステムおよび方法は、検出された患者６０２の呼吸サイクルに基づいて患者への呼吸ガスのフローを調整することができる。呼吸システムは、非密閉患者インターフェースを含み得る。呼吸システムは、ハイフロー療法を提供するように構成され得る。患者の呼吸サイクルは、流量、送風機モータ速度および／またはシステム圧力など、１つ以上の測定されたパラメータを用いて決定され得る。フロー供給源は、フローが、患者が吸息するのに応じて増大され、かつ患者が呼息するのに応じて減少されるように、患者の呼吸サイクルのものと整合する位相を有するように調整され得る。 【選択図】図６Ｂ

Flow path sensing for flow therapy apparatus

OF THE DISCLOSURE Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling. -52-

Flow path sensing for flow therapy apparatus

OF THE DISCLOSURE A respiratory flow therapy apparatus including a sensor module can measure a flow rate of gases or gases concentration provided to a patient. The sensor module can be located after a blower and/or mixer. The sensor module can include at least an ultrasonic transmitter, a receiver, a temperature sensor, a pressure sensor, a humidity sensor and/or a flow rate sensor. The receivers can be immersed in the gases flow path. The receivers can cancel delays in the transmitters and improve accuracy of measurements of characteristics of the gases flow. The receivers can allow for detection of a fault condition in a blower motor of the apparatus.

Flow path sensing for flow therapy apparatus

A respiratory flow therapy apparatus including a sensor module can measure a flow rate of gases or gases concentration provided to a patient. The sensor module can be located after a blower and/or mixer. The sensor module can include at least an ultrasonic transmitter, a receiver, a temperature sensor, a pressure sensor, a humidity sensor and/or a flow rate sensor. The receivers can be immersed in the gases flow path. The receivers can cancel delays in the transmitters and improve accuracy of measurements of characteristics of the gases flow. The receivers can allow for detection of a fault condition in a blower motor of the apparatus.

Deterministically controlled humidification system

Closed loop oxygen control

The apparatus provides a flow of gases to a patient and comprises a controller configured to control delivery of gases to the patient using closed loop control which is configured to deliver a nasal high flow (NHF) gases flow to the patient, receive data from at least one patient sensor indicative of a measured oxygen saturation (SpO2) of the patient, receive data indicative of a measured fraction of delivered oxygen (FdO2) of the gases flow, determine an oxygen efficiency of the patient and generate a patient specific model using the determined oxygen efficiency of the patient.

Closed loop oxygen control

The apparatus provides a flow of gases to a patient and comprises a controller configured to control delivery of gases to the patient using closed loop control. The controller is configured to control oxygen concentration (FdO2) of the gases flow to the patient, receive data from at least one patient sensor indicative of a measured oxygen saturation (SpO2) of the patient, receive data indicative of a measured FdO2 of the gases flow, receive a target SpO2 for the patient and execute a step change to the FdO2 of the gases flow. The magnitude of the step change is based at least in part on the measured SpO2, the target SpO2 and an oxygen efficiency of the patient.

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient.

閉ループ酸素制御

【課題】フロー療法装置での酸素供給を制御するための方法及びシステムに関する。【解決手段】フロー療法装置１０は、閉ループ制御を使用して患者へのガスの供給を制御するように構成されたコントローラ１３を含む。コントローラは少なくとも１つのセンサー２６から、患者の酸素飽和度（ＳｐＯ２）を示す患者パラメータデータを受信し、制御フェーズを実行する。治療セッション中の呼吸器の動作は、少なくとも一部には患者パラメータデータに基づいている。呼吸器の動作中、少なくともガス流の酸素含有量（ＦｄＯ２）を決定するように構成された超音波センサーシステムであるガス組成センサーを含む。【選択図】図１Ａ

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient.

Improved respiratory support apparatus

A respiratory support system can be configured to automatically mitigate a risk of patient discomfort and/or harm associated with the flow of heated, humidified gases provided to a patient. The system includes a humidifier unit which holds and heats a volume of water, and which receives a flow of gases via an inlet port. The flow of gases passes through the humidifier and exits via an exit port. The system also includes a controller which receives data from various sensors in the system, and which can control heating of a heater plate in the humidifier. The control output is configured to adjust the maximum power limit to the heater plate to prevent dangerous enthalpy levels and/or dew points of the gases leaving the patient interface.

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient.

Methods and systems for controlling oxygen delivery in a flow therapy apparatus

Flow path sensing for flow therapy apparatus

EDITORIAL NOTE APPLICATION NUMBER - 2022203383 Please note: Abstract page 53 should be numbered page 50. ABSTRACT OF THE DISCLOSURE [0200] A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow. -53-

Respiratory assistance apparatus

A respiratory assistance apparatus (4) is provided, adapted to deliver gases to a user or patient (1). The apparatus (4) comprises a housing (10) provided with a chamber (5) and a heater (25), the chamber (5) comprising at least one gas port (15) connected to, or arranged to be connected to, at least one intermediate passageway (12). The apparatus (4) is operative according to a disinfection mode of predetermined profile in which the heater (25) heats liquid in the chamber (5) to produce vapour at or above a target dewpoint temperature and/or humidity level. The apparatus (4) is arranged such that the vapour is delivered to the intermediate passageway (12) to disinfect the intermediate passageway (12) with moist heat throughout a predetermined duration of the disinfection mode. Associated attachments and methods are also provided.

Respiratory assistance apparatus

A respiratory assistance apparatus (4) is provided, adapted to deliver gases to a user or patient (1). The apparatus (4) comprises a housing (10) provided with a chamber (5) and a heater (25), the chamber (5) comprising at least one gas port (15) connected to, or arranged to be connected to, at least one intermediate passageway (12). The apparatus (4) is operative according to a disinfection mode of predetermined profile in which the heater (25) heats liquid in the chamber (5) to produce vapour at or above a target dewpoint temperature and/or humidity level. The apparatus (4) is arranged such that the vapour is delivered to the intermediate passageway (12) to disinfect the intermediate passageway (12) with moist heat throughout a predetermined duration of the disinfection mode. Associated attachments and methods are also provided.

A respiratory support apparatus having a high temperature mode

Adjustable expiratory relief in respiratory therapy

Systems and methods for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. The system can synchronize the flow rate with the detected breath cycle of the patient. The amplitude of the flow rate variation can be based partially on a value selected by the user. The adjustments to the flow rate can be done by controlling the motor speed using a positive feedback system. The adjustments to the flow rate can also be limited by the controller preventing the flow rate from crossing a minimum and/or maximum threshold.

A respiratory support apparatus having a high temperature mode

According to this disclosure there is provided a respiratory support apparatus configured to provide a gases flow to a patient, the respiratory support apparatus comprising: a flow generator configured to generate the gases flow; a humidifier configured to humidify the gases flow; and a controller. The apparatus is controlled by the controller to function in at least two modes, being a normal mode and a high-temperature mode. In the high-temperature mode the temperature of gases delivered to the patient is higher than the temperature of gases delivered to the patient when in the normal mode. In the high-temperature mode, the controller controls one or more parameters of the gases flow to be different to that in the normal mode, whilst providing higher temperatures. The apparatus is also operative in a cool-down mode in which one or more parameters of the gases flow are controlled. The apparatus includes safety features to ensure the temperature, dew-point, enthalpy, and/or energy of the gases flow do not exceed safe limits.

Respiratory assistance apparatus

EDITORIAL NOTE APPLICATION NUMBER - 2021221906 Please note: Abstract page 49 should be numbered 51. - 49 ABSTRACT A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases 5 outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Flow path sensing for flow therapy apparatus

Thermistor flow sensor having multiple temperature points

A gases flow rate sensing system may be configured to operate in at least two different target temperature modes, based upon a measured temperature of the gases flow. In some embodiments, the gases flow sensing system may have a voltage divider containing a thermistor. The gases flow rate may be determined based upon a voltage output indicating an amount of power needed to maintain the thermistor at a target temperature as specified by the target temperature mode, and a measured temperature of the gases flow.

Respiratory assistance apparatus

A respiratory assistance apparatus has a gases inlet configured to receive a supply of gases, a blower unit configured to generate a pressurised gases stream from the supply of gases; a humidification unit configured to heat and humidify the pressurised gases stream; and a gases outlet for the heated and humidified gases stream. A flow path for the gases stream extends through the respiratory device from the gases inlet through the blower unit and humidification unit to the gases outlet. A sensor assembly is provided in the flow path before the humidification unit. The sensor assembly has an ultrasound gas composition sensor system for sensing one or more gas concentrations within the gases stream.

Improved respiratory support apparatus

A respiratory support system can be configured to automatically mitigate a risk of patient discomfort and/or harm associated with the flow of heated, humidified gases provided to a patient. The system includes a humidifier unit which holds and heats a volume of water, and which receives a flow of gases via an inlet port. The flow of gases passes through the humidifier and exits via an exit port. The system also includes a controller which receives data from various sensors in the system, and which can control heating of a heater plate in the humidifier. The control output is configured to adjust the maximum power limit to the heater plate to prevent dangerous enthalpy levels and/or dew points of the gases leaving the patient interface.

A respiratory apparatus and control methods

A respiratory apparatus that is configured to provide a flow of gases to a user for respiratory therapy. A flow generator is operable to generate a flow of gases. A controller is operable to control one or more properties of the flow of gases provided to the user by controlling a motor speed of the flow generator. The controller is configured to receive one or more input therapy settings that represents one or more properties desired for the generated flow of gases during a therapy session. The controller predicts if a steady-state temperature of the apparatus will exceed a high-temperature-condition threshold, based at least partly on input therapy setting(s) and a heat model of the apparatus. The controller may generate an alarm and/or initiate an alarm response counteraction control measure in response to the prediction to reduce the risk of the apparatus exceeding the high-temperature-condition threshold.

Flow path sensing for flow therapy apparatus

OF THE DISCLOSURE [0200] A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow. -50-

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient.

Adjustable expiratory relief in respiratory therapy

Systems and methods for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. The system can synchronize the flow rate with the detected breath cycle of the patient. The amplitude of the flow rate variation can be based partially on a value selected by the user. The adjustments to the flow rate can be done by controlling the motor speed using a positive feedback system. The adjustments to the flow rate can also be limited by the controller preventing the flow rate from crossing a minimum and/or maximum threshold.

Flow path sensing for flow therapy apparatus

A respiratory flow therapy apparatus including a sensing chamber which measures a flow of gases provided to a patient. The sensing chamber can be located after a blower and/or mixer. The sensing chamber can include an ultrasonic transducer, a temperature sensor, a heated temperature sensing element, and/or a gas concentration sensor. A flow path of gases used in conjunction with the sensor system prevents unwanted vorticity in the flow of gases that can create anomalies in measuring flow.

Systems for controlling oxygen delivery in a flow therapy apparatus

The present disclosure provides for a control system for a flow therapy apparatus. The control system can control delivery of a fraction of delivered oxygen (FdO2) to a patient. The control system can maintain the FdO2 at a target level during a therapy session. The control system can automatically control an oxygen inlet valve in order to control the flow of oxygen to the patient.

Systems for controlling oxygen delivery in a flow therapy apparatus

Flow path sensing for flow therapy apparatus

Systems and method for conducting respiratory therapy in a respiratory system can adjust a flow of respiratory gases to a patient based upon a detected patient breath cycle. The respiratory system can include a non-sealed patient interface. The respiratory system can be configured to deliver a high flow therapy. A patient breath cycle may be determined using one or more measured parameters, such as a flow rate, a blower motor speed, and/or a system pressure. A flow source may be adjusted to have a phase matching that of the patient's breath cycle, such that flow in increased in response to the patient inhaling, and decreased in response to the patient exhaling.

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient. 29172171 -113-

Closed loop oxygen control

The present disclosure provides for a flow therapy apparatus that can implement one or more closed loop control systems to control the flow of gases of a flow therapy apparatus. The flow therapy apparatus can monitor blood oxygen saturation (SpO2) of a patient and control the fraction of oxygen delivered to the patient (FdO2). The flow therapy apparatus can automatically adjust the FdO2 in order to achieve a targeted SpO2 value for the patient.