Nasal interface

• US 9,561,339 B2
• Filed: 03/23/2016
• Issued: 02/07/2017
• Est. Priority Date: 11/18/2009
• Status: Active Grant

• Current Assignee: Fisher & Paykel Healthcare Limited
• Original Assignee: Fisher & Paykel Healthcare Limited
• Inventors: McAuley, Alastair Edwin, van Beurden, Jason, White, Craig Karl, Leslie, Tristan Andrew, Nightingale, Christopher Earl
• Primary Examiner(s): Woodward, Valerie L
• Assistant Examiner(s): SUL, DOUGLAS YOUNG
• Application Number:
  US15/078,970
• Publication Number:
  US 20160199610A1
• Time in Patent Office: 321 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/06 Respiratory or anaesthetic masks
• CPC Class Codes: A61M 16/0616 with face sealing means comprising a flap or membrane projecting inwards, such that sealing increases with increasing inhalation gas pressure
• CPC Class Codes: A61M 16/0666 Nasal cannulas or tubing devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02
• CPC Class Codes: A61M 16/0672 Nasal cannula assemblies for oxygen therapy
• CPC Class Codes: A61M 16/0683 Holding devices therefor
• CPC Class Codes: A61M 16/0816 Joints or connectors
• CPC Class Codes: A61M 16/0825 with ball-sockets
• CPC Class Codes: A61M 16/085 Gas sampling
• CPC Class Codes: A61M 16/0866 Passive resistors therefor
• CPC Class Codes: A61M 16/0875 Connecting tubes
• CPC Class Codes: A61M 16/105 Filters A61M16/047, A61M16/22 take precedence; water traps A61M16/08
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 16/1095 in the connecting tubes
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/161 with means for measuring the humidity
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/3653 by Joule effect, i.e. electric resistance
• CPC Class Codes: A61M 2205/42 Reducing noise
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2210/0618 : Nose

Abstract

A nasal cannula for use in a system for providing a flow of respiratory gases to a user is described. The nasal cannula comprises a body made from a pliable material. The body has an inlet and at least one nasal prong fluidly connected to the inlet. In use a conduit providing a flow of gases to the cannula is connected to the inlet, and the nasal prong is inserted into a user'"'"'s nostril. The cannula is arranged to direct the flow of gases from the nasal prong towards the front wall of the user'"'"'s nasal passage within the user'"'"'s nose.

Claims

1. A nasal interface configured to provide a flow of respiratory gases to a user in use, the nasal interface comprising:

a headgear including a strap configured to support the nasal interface against a user in use; and

a nasal cannula assembly including a nasal cannula body and a frame that provides support to the nasal cannula assembly, the nasal cannula assembly comprising;

first and second nasal prongs, each of the first and second nasal prongs configured to extend into a user'"'"'s nostril in use;

a manifold including an inlet connected to a conduit configured to provide respiratory gases to the inlet, the manifold connecting the inlet to the first and second nasal prongs such that gases flow from the conduit, into the nasal cannula body through the inlet, and through the manifold to exit each of the first and second nasal prongs to enter the user'"'"'s nostrils;

first and second side arms extending from first and second lateral sides of the nasal cannula assembly;

a bridging portion extending between and connected to the first and second side arms;

an expiratory flow passage defining an expiratory flow direction with a cross sectional shape transverse to the expiratory flow direction, the expiratory flow passage defined between the bridging portion and the inlet, the cross sectional shape of the expiratory flow passage having at least first, second, and third sides, the first side defined by the inlet and being concave, the second and third sides having straight portions adjacent to the first side; and

a filter material disposed in the expiratory flow passage.

2. The nasal interface according to claim 1, wherein the nasal cannula body is resilient, flexible, and pliable, and wherein the filter material comprises noise suppression media configured to attenuate sound.

3. The nasal interface according to claim 1, wherein the concave first side of the expiratory flow passage is spaced from the first side arm by the straight portion of the second side of the expiratory flow passage.

4. A nasal interface configured to provide a flow of respiratory gases to a user in use, the nasal interface comprising:

a headgear including a strap configured to support the nasal interface against a user in use; and

a nasal cannula assembly including a nasal cannula body and a frame supporting the nasal cannula body, the nasal cannula assembly comprising;

first and second nasal prongs, each of the first and second nasal prongs configured to extend into a user'"'"'s nostril in use;

a manifold including an inlet connected to a conduit configured to provide respiratory gases to the inlet, the manifold connecting the inlet to the first and second nasal prongs;

first and second side arms extending from first and second lateral sides of the nasal cannula assembly; and

a bridging portion extending between and connected to the first and second side arms, the bridging portion and the inlet defining at least a portion of an expiratory flow passage, wherein the portion of the expiratory flow passage defines an expiratory flow direction with a cross sectional shape transverse to the expiratory flow direction, the inlet defining a concave portion of the cross sectional shape.

5. The nasal interface according to claim 4, additionally comprising a filter material in the expiratory flow passage.

6. The nasal interface according to claim 5, wherein the filter material comprises noise suppression media.

7. The nasal interface according to claim 6, wherein the expiratory flow passage comprises at least first, second, and third sides, the first side comprising the concave portion, the second and third sides having straight portions adjacent to the first side.

8. The nasal interface according to claim 7, wherein the expiratory flow passage is disposed between the first and second side arms.

9. The nasal interface according to claim 8, wherein the inlet defines a portion of an inspiratory flow passage, the filter material being disposed in a portion of the expiratory flow passage that is parallel to the inspiratory flow passage.

10. The nasal interface according to claim 7, wherein the first side arm is connected to the bridging portion at a first connection point positioned adjacent a lateral side of the expiratory flow passage.

11. The nasal interface according to claim 5, wherein the filter material is configured to attenuate sound.

12. The nasal interface according to claim 4, wherein the nasal cannula body is pliable, resilient, and flexible.

13. The nasal interface according to claim 4, wherein the manifold connects the inlet and the first and second nasal prongs such that gases flow into the nasal cannula body through the inlet, through the manifold to each of the first and second nasal prongs and to enter the user'"'"'s nostrils.

14. A nasal interface configured to provide a flow of respiratory gases to a user in use, the nasal interface comprising:

a nasal cannula assembly comprising;

first and second nasal prongs, each of the first and second nasal prongs configured to extend into a user'"'"'s nostril in use;

first and second side arms extending from first and second lateral sides of the nasal cannula assembly;

a bridging portion extending between and connected to the first and second side arms; and

an expiratory flow passage defined at least in part by a portion of the bridging portion extending between the first and second side arms, the expiratory flow passage defining an expiratory flow direction with a cross sectional shape transverse to the expiratory flow direction, a portion of the cross sectional shape being concave.

15. The nasal interface according to claim 14, additionally comprising a filter material in the expiratory flow passage.

16. The nasal interface according to claim 15, wherein the filter material comprises noise suppression media.

17. The nasal interface according to claim 14, wherein the nasal cannula assembly comprises a cannula body and a frame including an inlet connected to a conduit configured to provide respiratory gases to the inlet.

18. The nasal interface according to claim 14, wherein the first and second side arms comprise a flexible material.

19. The nasal interface according to claim 17, wherein the expiratory flow passage is defined between the bridging portion and the inlet.

20. The nasal interface according to claim 17, wherein the expiratory flow passage is defined by both the bridging portion and the inlet.

21. The nasal interface according to claim 15, wherein the nasal cannula assembly comprises an inlet defining a portion of an inspiratory flow passage, the filter material being disposed in a portion of the of the expiratory flow passage that is parallel to the inspiratory flow passage.

22. The nasal interface according to claim 15, wherein the filter material is configured to attenuate sound.