Positive-air-pressure machine conduit

1. A patient interface assembly for delivering a supply of pressurized gas to a patient for treatment of sleep disordered breathing, the patient interface assembly comprising:

a patient interface configured to engage the patient's face to direct the supply of pressurized gas to an airway of the patient for treatment of sleep disordered breathing; and

headgear to support the patient interface in a desired position on the patient's face, the headgear including:

a pair of flexible conduits configured to support the patient interface and to deliver the supply of gas to the patient interface in use, each conduit having a top portion in fluid communication with the supply of gas and a bottom portion adapted to, in use, be connected to the patient interface, each conduit being arranged to, in use, extend along a respective side of the patient's head between the patient's eye and ear; and

a strap extending between the pair of conduits and adapted to engage a rear portion of the patient's head when the patient interface assembly is worn, wherein the patient interface assembly does not include additional conduit tubing and does not include an additional securement strap, and

wherein each conduit includes a foam inner layer and a fabric outer layer provided over the foam inner layer such that the fabric outer layer provides an outer surface of the conduit configured to contact the patient's skin in use.

2. The patient interface assembly according to claim 1 , wherein each conduit comprises a lamination of a plurality of materials.

3. The patient interface assembly according to claim 2 , wherein the foam inner layer and the fabric outer layer are laminated.

4. The patient interface assembly according to claim 3 , wherein a portion of the pair of flexible conduits includes a gas permeable material to allow exhaust gases to pass therethrough to atmosphere.

5. The patient interface assembly according to claim 1 , wherein the conduits comprise an elastomer.

6. The patient interface assembly according to claim 1 , further comprising an air connector configured to be fluidly connected to the supply of pressurized gas, the air connector being adapted to be stably positioned at the top of the patient's head when the patient interface assembly is worn.

7. The patient interface assembly according to claim 6 , said headgear further comprising a central portion disposed between the pair of conduits to fluidly join the top portions of the conduits, the central portion being configured to contact the top of the patient's head when the patient interface assembly is worn.

8. The patient interface assembly according to claim 7 , wherein the air connector is directly attached to the central portion.

9. The patient interface assembly according to claim 8 , wherein the air connector is relatively rigid as compared to the pair of conduits and the central portion.

10. The patient interface assembly according to claim 9 , said central portion further comprising an aperture formed therein, a first portion of the air connector extending into the aperture and within the central portion while a second portion of the air connector protrudes away from the aperture and extends exterior to the central portion.

11. The patient interface assembly according to claim 8 , wherein the air connector enables movement of an air supply tube with respect to the central portion to reduce tube drag.

12. The patient interface assembly according to claim 11 , wherein the air connector comprises a swivel coupling device.

13. The patient interface assembly according to claim 12 , wherein the swivel coupling device has a coaxial arrangement with the air connector.

14. The patient interface assembly according to claim 8 , wherein the central portion is arranged such that the air connector is adapted to be positioned anterior of an apex of the patient's head when the patient interface assembly is worn.

15. The patient interface assembly according to claim 1 , wherein the pair of conduits is shaped to match a contour of the patient's head.

16. The patient interface assembly according to claim 1 , wherein each conduit comprises a conduit wall that is deformable between (a) an open condition in which the conduit wall defines a conduit passage along which the pressurized gas can travel from the top portion to the bottom portion, and (b) a collapsed condition in which the conduit wall substantially collapses the conduit passage.

17. The patient interface assembly according to claim 16 , wherein each conduit is configured to deform into the collapsed condition under the weight of the patient's head.

18. The patient interface assembly according to claim 1 , wherein the strap is respectively connected to the pair of conduits at a first attachment point and a second attachment point that are arranged to be positioned superior to the patient's ear when the patient interface assembly is worn.

19. The patient interface assembly according to claim 18 , wherein the strap is integrally formed with the pair of conduits.

20. The patient interface assembly of claim 1 , further comprising an interface connector attached to the bottom portion of each conduit, each interface connector being removably connected to a respective side of the patient interface.

21. The patient interface assembly of claim 20 , wherein each interface connector includes a connection portion that extends from the respective conduit to connect with the patient interface.

22. The patient interface assembly of claim 20 , wherein the patient interface includes two complimentary formations on opposing sides thereof to mate with a respective one of the interface connectors.

23. The patient interface assembly of claim 1 , further comprising a vent in the vicinity of the patient's nose to allow exhaled carbon dioxide to pass to atmosphere.

24. The patient interface assembly of claim 1 , wherein the patient interface is a nasal interface configured to engage the patient's nose in use.

25. The patient interface assembly of claim 1 , wherein the foam inner layer and the fabric outer layer are laminated, and the fabric outer layer is configured to contact the patient's skin in use,

further comprising an air connector configured to be fluidly connected to the supply of pressurized gas, the air connector being adapted to be positioned on top of the patient's head when the patient interface assembly is worn,

said headgear further comprising a central portion disposed between the pair of conduits to fluidly join the top portions of the conduits, the central portion being configured to contact the top of the patient's head when the patient interface assembly is worn,

wherein the air connector is directly attached to the central portion, an aperture being formed in the central portion and the air connector extending into the aperture,

wherein the air connector is relatively rigid as compared to the pair of conduits and the central portion,

wherein the air connector enables movement of an air supply tube with respect to the central portion to reduce tube drag,

wherein the air connector comprises a swivel coupling device, the swivel coupling device having a coaxial arrangement with the air connector,

wherein the central portion is arranged such that the air connector is adapted to be positioned anterior of an apex of the patient's head when the patient interface assembly is worn,

wherein each conduit comprises a conduit wall that is deformable between (a) an open condition in which the conduit wall defines a conduit passage along which the pressurized gas can travel from the top portion to the bottom portion, and (b) a collapsed condition in which the conduit wall substantially collapses the conduit passage,

wherein each conduit is configured to deform into the collapsed condition under the weight of the patient's head,

further comprising an interface connector attached to the bottom portion of each conduit, each interface connector being removably connected to a respective side of the patient interface, each interface connector including a connection portion that extends from the respective conduit to connect with the patient interface, and

wherein the patient interface includes two complimentary formations on opposing sides thereof to mate with a respective one of the interface connectors.

26. The patient interface assembly of claim 1 , wherein each conduit includes a portion configured to extend along a respective side of the patient's head in use, each portion including 1) a first section having a width that gradually decreases along a length of the conduit in a direction towards the bottom portion, and 2) a second section relatively proximate the bottom portion as compared to the first section, the second section having a width that gradually increases along a length of the conduit in the direction towards the bottom portion.

27. The patient interface assembly of claim 26 , wherein the first section is directly adjacent the second section such that no other sections of the conduit are disposed between the first section and the second section.

28. The patient interface assembly of claim 27 , wherein both the first section and the second section of each conduit are inferior to the strap when the patient interface assembly is worn.

29. The patient interface assembly of claim 27 , wherein the strap is respectively connected to the pair of conduits at a first attachment point and a second attachment point, and

wherein both the first section and the second section of each conduit are inferior to the first attachment point and a second attachment point when the patient interface assembly is worn.

30. The patient interface assembly of claim 29 , wherein each conduit includes a third section that is superior to the first attachment point and the second attachment point when the patient interface assembly is worn,

wherein the third section of each conduit is wider than at least the first section.

31. The patient interface assembly of claim 7 , wherein the air connector is removably attached to the central portion.

32. The patient interface assembly of claim 10 , wherein the conduits, the central portion and the interface form a ring with a ring-shaped gas passageway,

said aperture in the central portion being adapted to be in fluid communication with an air supply tube, and

wherein the first portion of the air connector is firmly engaged with at least a portion of the central portion that is disposed along the ring.

33. The patient interface assembly of claim 10 , wherein the conduits, the central portion and the interface form a ring with a ring-shaped gas passageway,

said aperture in the central portion being adapted to be in fluid communication with an air supply tube, and

wherein the first portion of the air connector extends into the ring formed by the conduits, the central portion and the interface.

34. The patient interface assembly of claim 33 , wherein the central portion has a bottom wall configured to directly contact the patient's head and a top wall opposite the bottom wall when the patient interface assembly is worn, the top wall of the central portion having the aperture formed therein, and

wherein the bottom wall of the central portion and the top wall of the central portion are spaced apart so as to form a portion of the ring-shaped gas passageway therebetween.

35. The patient interface assembly of claim 34 , wherein the bottom wall of the central portion is configured to conform to a shape of the patient's head when the patient interface assembly is worn.

36. The patient interface assembly of claim 33 , wherein the second portion of the air connector is configured to connect to the air supply tube, the second portion of the air connector being movable relative to the first portion of the air connector to enable movement of the air supply tube with respect to the central portion to reduce tube drag.

37. The patient interface assembly according to claim 36 , wherein the air connector comprises a pivotable pipe structure, a ball-and-socket structure or a bellows structure to enable the second portion of the air connector to be movable relative to the first portion of the air connector.

38. The patient interface assembly according to claim 10 , wherein the first portion of the air connector has an end portion disposed within an interior of the central portion, an exterior surface of the end portion extending laterally within the central portion in a direction of each of the conduits.

39. The patient interface assembly according to claim 1 , wherein the bottom portion of each conduit is connected the patient interface via an interface connector.

40. The patient interface assembly according to claim 1 , wherein each conduit is configured to inflate, upon introduction of pressurized air, into an open condition forming a conduit passage.

41. The patient interface assembly according to claim 1 , wherein each conduit comprises a conduit wall that is deformable between (a) the open condition in which the conduit wall defines the conduit passage along which the pressurized gas can travel from the top portion to the bottom portion, and (b) a collapsed condition in which the conduit wall substantially collapses the conduit passage.

42. The patient interface assembly according to claim 41 , wherein each conduit is configured to deform into the collapsed condition under the weight of the patient's head.

43. The patient interface assembly of claim 42 , wherein each conduit is configured to accommodate an increase in volume flow rate of pressurized gas through the conduit when the conduit passage of the other conduit is in the collapsed condition.

44. The patient interface assembly of claim 41 , wherein the conduits are configured such that a total volume flow rate of pressurized gas through the conduits remains substantially constant even if one of the conduits is deformed into the collapsed condition.