Respiratory system and method

Patent metadata

Field	Value
Publication number	US-2024033456-A1
Application number	US-202118257491-A
Country	US
Kind code	A1
Filing date	Dec 17, 2021
Priority date	Dec 18, 2020
Publication date	Feb 1, 2024
Grant date	—

Abstract

This present disclosure relates to a system and method for providing a flow of respiratory gases to a patient. The system includes a controller, a flow modulator, and one or more sensors, wherein the controller is configured to control the flow modulator to modulate the flow of respiratory gases in response to determined pressure in the system exceeding or not exceeding a pressure threshold value.

First claim

1 . A respiratory system for providing a flow of respiratory gases to a patient, the system comprising:
a flow modulator; a controller configured to receive an input of a flow rate and a pressure of the flow of respiratory gases in the system, and configured to:
control the flow modulator to provide the flow of respiratory gases at a target flow rate to a patient; and
control the flow modulator to modulate the flow of respiratory gases to a target pressure when the pressure of the flow of respiratory gases in the system meets or exceeds a pressure threshold value corresponding to that target flow rate.

2 . The respiratory system of claim 1 , wherein the target pressure comprises the pressure threshold value corresponding to the target flow rate or a pressure threshold value corresponding to a flow rate less than the target flow rate.

3 . The respiratory system of claim 1 or claim 2 , wherein the controller is configured to control the flow modulator to modulate the flow of respiratory gases to the target pressure when the flow rate of the flow of respiratory gases is less than the target flow rate.

4 . The respiratory system according to any one of the preceding claims, wherein the controller is configured to control the flow modulator to modulate the flow of respiratory gases to the target flow rate when the flow rate of the flow of respiratory gases is above the target flow rate.

5 . The respiratory system according to any one of the preceding claims, wherein the controller is configured to control the flow modulator to the target pressure when the pressure of the flow of respiratory gases exceeds the pressure threshold value corresponding to the target flow rate or a pressure threshold value corresponding to flow rates less than the target flow rate.

6 . The respiratory system according to any one of the preceding claims, wherein when the system begins operation from an ‘off’ or dormant state, the controller is configured to monitor the flow rate of the flow of respiratory gases in the system and is configured to control the flow modulator to modulate the flow of respiratory gases to the target flow rate, and optionally wherein the target flow rate changes over time to increase from a current value to a flow rate set point.

7 . The respiratory system according to any one of the preceding claims, wherein the target flow rate is a flow rate set point.

8 . The respiratory system according to claim 6 or claim 7 , wherein the flow rate set point is determined by a user of the respiratory system.

9 . The respiratory system according to any one of the preceding claims, wherein the controller comprises a flow rate controller providing a flow rate control output and a pressure controller providing a pressure control output, wherein the control input to the flow modulator is the minimum of the flow rate control output and the pressure control output.

10 . The respiratory system according to claim 9 , wherein the flow modulator comprises a blower, and the flow rate control output and pressure control output comprise an angular velocity of the blower.

11 . The respiratory system according to claim 9 or 10 , wherein the flow modulator comprises a proportional valve, and the flow rate control output and pressure control output comprise a size of a flow path restriction through the proportional valve.

12 . The respiratory system according to any one of the preceding claims, wherein the controller is configured to receive a flow rate value indicative of flow rate of respiratory gases provided to the patient.

13 . The respiratory system according to claim 12 , wherein the controller is operable in a first control mode when the flow rate is above the target flow rate to control the flow rate to the target flow rate, and the controller is operable in a second control mode when the pressure of the flow of respiratory gases is above the pressure threshold value corresponding to the target flow rate or is above a or the pressure threshold value corresponding to a flow rate less than the target flow rate, to control the pressure to the target pressure.

14 . The respiratory system according to any one of the preceding claims, comprising one or more flow rate sensors configured to sense a flow rate of the flow of respiratory gases in the system to the patient.

15 . The respiratory system according to any one of the preceding claims, comprising one or more pressure sensors configured to sense a pressure of the flow of respiratory gases in the system to the patient.

16 . The respiratory system according to claim 14 or claim 15 , wherein the controller is further configured to receive an input indicative of the flow rate of the flow of respiratory gases in the system from the one or more flow rate sensors, and an input indicative of the pressure of the flow of respiratory gases in the system from the one or more pressure sensors.

17 . The respiratory system according to any one of the preceding claims, further comprising a delivery conduit for providing a flow of gases from the flow modulator to a patient interface, wherein the patient interface is configured to deliver the flow of respiratory gases to the patient.

18 . The respiratory system according to claim 17 , wherein the patient interface comprises a gases delivery side arm in fluid communication with the delivery conduit, a manifold provided at an end of the gases delivery side arm, and one or more nasal elements extending from the manifold, the one or more nasal element configured to provide the flow of respiratory gases to one or more nares of the patient, wherein the gases delivery side member comprises a collapsible portion.

19 . The respiratory system of claim 18 , wherein the collapsible portion is operable in a first configuration in which the collapsible portion is in a substantially open condition, and in a second configuration in which the collapsible portion is in a substantially closed condition.

20 . The respiratory system according to any one of the preceding claims, wherein when the controller controls the flow modulator to the target pressure, flow to the patient is reduced to a reduced flow rate which is: about 15 L/min or less; or about 10 L/min or less; or about 10 L/min; or about 5 L/min to about 10 L/min or less than about 5 L/min or 0 L/min.

21 . The respiratory system according to any one of the preceding claims, wherein the controller is configured to control the flow modulator to increase the flow of respiratory gases towards the target flow rate.

22 . The respiratory system of claim 17 or claim 18 , wherein the patient interface comprises a nasal cannula, optionally a non-sealing nasal cannula.

23 . The respiratory system of any one of claims 27 , 18 and 22 , wherein the delivery conduit further comprises a delivery circuit and a patient breathing circuit disposed between the delivery circuit and the patient interface, and wherein the patient breathing circuit is connected to the delivery circuit by an outlet connector.

24 . The respiratory system of any one of the preceding claims, wherein the flow modulator comprises one or more of:
a flow generator configured to be controlled by the controller to modulate the flow of respiratory gases to a patient; and a proportional valve configured to be controlled by the controller to modulate the flow of respiratory gases.

25 . The respiratory system of claim 24 , wherein the flow generator c

Assignees

• Fisher & Paykel Healthcare Ltd

Inventors

• Gray Nathanael Charles
• Wilson Matthew Robert
• Osborne Hamish Adrian
• Payton Matthew Jon
• Cheung Man Kit Jacky

Classifications

• A61M16/022 Primary

  Control means therefor · CPC title

• A61M16/0066

  Blowers or centrifugal pumps · CPC title

• A61M16/0003

  Accessories therefor, e.g. sensors, vibrators, negative pressure · CPC title

• A61M16/0666

  Nasal cannulas or tubing (devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02) · CPC title

• G16H40/63

  for local operation · CPC title