Positive pressure breathing circuit

Patent metadata

Field	Value
Publication number	US-2025144354-A1
Application number	US-202218837328-A
Country	US
Kind code	A1
Filing date	Feb 11, 2022
Priority date	Feb 11, 2022
Publication date	May 8, 2025
Grant date	—

Abstract

The present disclosure relates to a positive pressure breathing circuit and a method for ventilating a patient. The breathing circuit can be used in any type of pressurized breathing therapy including, for example, continuous positive air (way) pressure (CPAP) therapy and bilevel positive air pressure therapy where the inspiratory and expiratory pressures differ.

First claim

1 . A positive pressure breathing circuit for ventilating a patient, the breathing circuit including:
an inspiratory member including a proximal portion that is connectable to a patient interface for supplying a breathing gas, and a distal portion that is connectable to a first source of a pressurized first gas and a second source of a pressurized second gas, wherein the second gas enters the inspiratory member downstream to where the first gas enters the inspiratory member; and a pressure regulation device configured to regulate pressure in the breathing circuit, including venting exhaled gas.

2 . The breathing circuit according to claim 1 , wherein the breathing circuit includes an expiratory member which receives the exhaled gas from the patient interface.

3 . The breathing circuit according to claim 2 , wherein the expiratory member includes an expiratory tube extending away from the patient interface.

4 . The breathing circuit according to any one of the preceding claims , wherein the inspiratory member includes an inspiratory tube.

5 . The breathing circuit according to any one of the preceding claims , wherein the inspiratory member includes a first non-return valve and the first gas enters the inspiratory member upstream of the first non-return valve and the second gas enters the inspiratory member downstream of the first non-return valve.

6 . The breathing circuit according to claim 5 , wherein the first non-return valve is configured to inhibit the second gas flowing upstream toward the first gas entering the inspiratory member.

7 . The breathing circuit according to any one of the preceding claims , wherein the inspiratory member is configured so that a volume of the second gas can enter and flow toward the patient interface without being inhaled during patient exhalation.

8 . The breathing circuit according to claim 7 , wherein the internal volume of the inspiratory member for receiving the volume of the second gas can be changed by changing the length of the inspiratory member to accommodate a desired volume of the second gas during patient exhalation.

9 . The breathing circuit according to any one of the preceding claims when appended to claim 2 , wherein the expiratory member includes a second non-return valve to inhibit the exhaled gas from re-entering the patient interface.

10 . The breathing circuit according to any one of the preceding claims , wherein the pressure regulation device is directly connected to the patient interface.

11 . The breathing circuit according to any one of the preceding claims when appended to claim 2 , wherein the pressure regulation device is connected to the expiratory member and vents the exhaled gas from the expiratory tube.

12 . The breathing circuit according to claim 10 or 11 , wherein the pressure regulation device includes a pressure relief valve for venting exhaled gas, such as a positive end expiratory pressure valve (expiratory tube PEEP valve), or a restriction orifice.

13 . The breathing circuit according to any one of the preceding claims , wherein the pressure regulation device is configured to regulate pressure in the inspiratory member.

14 . The breathing circuit according to claim 13 , wherein the pressure regulation device is located on the inspiratory member and includes a pressure relief valve, such as a positive end expiratory pressure valve (inspiratory tube PEEP valve).

15 . The breathing circuit according to any one of the preceding claims , wherein the pressure regulation device is configured to regulate pressure in the expiratory member.

16 . The breathing circuit according to claim 15 , wherein the pressure regulation device is located on the inspiratory member and includes a pressure relief valve, such as a positive end expiratory pressure valve (inspiratory tube PEEP valve).

17 . The breathing circuit according to claim 15 , wherein the pressure regulation device of the expiratory member has a higher pressure setting than the pressure regulation device of the inspiratory member.

18 . The breathing circuit according to claim 17 , wherein the positive end expiratory pressure valve of the expiratory member may have a pressure setting ranging from about 2.5 to 35.0 cmH 2 O, about 4.5.0 to 25.0 cmH 2 O, about 6.5 to 15 cmH 2 O, or about 8.0 to 12.0 cmH 2 O, or about 10.0 cmH 2 O.

19 . The breathing circuit according to any one of the preceding claims , wherein the pressure regulation device includes a first control valve for controlling the pressure of the first gas supplied to the breathing circuit at a first gas inlet.

20 . The breathing circuit according to any one of the preceding claims , wherein the pressure regulation device includes a second control valve for controlling the pressure of the second gas supplied to the breathing circuit at a second gas inlet.

21 . The breathing circuit according to any one of the preceding claims when appended to claim 2 , wherein the inspiratory member is connectable to the expiratory member so that any excess of the first gas supplied to the inspiratory member passes (from the inspiratory member) to the expiratory member without passing through the patient interface.

22 . The breathing circuit according to claim 21 , wherein the inspiratory member and the expiratory member are connected in a loop configuration and the excess supply of the first gas is conveyed from the inspiratory tube to the expiratory tube in the loop configuration remote from the patent interface.

23 . The breathing circuit according to claim 21 or 22 , wherein the distal portion of the expiratory member and the distal portion of the inspiratory member are connected to allow the excess supply of the first gas to flow from the inspiratory tube to the expiratory tube.

24 . The breathing circuit according to any one of claims 21 to 23 , wherein the expiratory member includes a second non-return valve to inhibit the excess supply of the first gas from entering the patient interface from the expiratory member.

25 . The breathing circuit according to any one of claims 21 to 24 , wherein the expiratory member is configured so that the excess supply of the first gas in the expiratory member downstream of the second non-return valve and the exhaled gas in the expiratory member downstream of the second non-return valve are vented from the breathing circuit.

26 . The breathing circuit according to any one of claims 21 to 25 , wherein the second non-return valve also inhibits the exhaled gas from being rebreathed during patient inhalation.

27 . The breathing circuit according to any one of claims 21 to 26 , wherein the breathing circuit includes a bypass member interconnecting the inspiratory member and the expiratory member that conveys the excess supply of the first gas from the inspiratory member to the expiratory member.

28 . The breathing circuit according to any one of claims 21 to 27 , wherein the bypass member connects to the expiratory tube downstream of the second non-return valve.

29 . The breathing circuit according to any one of claims 21 to 28 , wherein the bypass member includes a bypass tube.

30 . The breathing circuit according to any one of claims 21 to 29 , wherein the expiratory member is configured so that the excess supply of the first gas and the exhaled gas downstream of the second non-return

Assignees

• Fisher & Paykel Healthcare Ltd

Inventors

• Huddart Brett John
• Grylls Peter Lawrence
• Whiting David Robin
• Gerred Andrew Gordon
• Salmon Andrew Paul Maxwell
• Wright Douglas Richard
• Hickey Ian Patrick Sarsfield
• Smith Daniel John
• Reeves Mark
• Harwood Jonathan David
• Toovey Lucas Michael
• Love David John

Classifications

• A61M16/0833

  T- or Y-type connectors, e.g. Y-piece · CPC title

• A61M2240/00

  Specially adapted for neonatal use · CPC title

• A61M2230/40

  Respiratory characteristics · CPC title

• A61M2230/005

  Parameter used as control input for the apparatus · CPC title

• A61M2205/3379

  Masses, volumes, levels of fluids in reservoirs, flow rates · CPC title