Adjustable headgear tubing for a patient interface

1. A patient interface for sealed delivery of a flow of air at a therapeutic pressure of at least 4 cmH 2 O with respect to ambient air pressure throughout the patient's respiratory cycle in use, the patient interface comprising:

a cushion assembly comprising:

a plenum chamber pressurisable to the therapeutic pressure, said plenum chamber including a pair of plenum chamber inlet ports, each of the plenum chamber inlet ports being sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient; and

a seal-forming structure constructed and arranged to seal with a region of the patient's face surrounding an entrance to the patient's airways such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use;

a positioning and stabilising structure configured to hold the seal-forming structure in a therapeutically effective position on a head of a patient, the positioning and stabilising structure comprising:

two gas delivery tubes, each of the two gas delivery tubes being connected to a corresponding one of plenum chamber inlet ports to deliver the flow of air to the entrance to the patient's airways via the cushion assembly, each of the two gas delivery tubes being configured to be positioned on a corresponding lateral side of the patient's head in use, at least one of the gas delivery tubes having a tab projecting outwardly therefrom in a generally posterior direction relative to the patient's head in use, the tab having a hole, and each of the two gas delivery tubes being constructed and arranged to contact, in use, at least a region of the patient's head superior to an otobasion superior of the patient's head;

a bias and adjustment mechanism configured to allow adjustment of a length of each of the two gas delivery tubes to enable the length of each of the two gas delivery tubes to be adjusted through a continuous range of lengths to fit different size heads, and the bias and adjustment mechanism being configured to impart a biasing force along at least a part of a length of each of the two gas delivery tubes to urge the seal-forming structure towards the entrance to the patient's airways in use;

a length-adjustable rear strap, an end of the length-adjustable rear strap being configured to pass through the hole of the tab to removably connect the length-adjustable rear strap to the gas delivery tube and the length-adjustable rear strap being configured, in use, to pass around a posterior portion of the patient's head; and

a connection port configured to fluidly connect, in use, the gas delivery tubes with an air circuit to deliver the flow of air to the patient's airways, the connection port configured to be located, in use, superior to the patient's head,

wherein each of the two gas delivery tubes comprises a first end configured to be connected to the cushion assembly,

wherein the bias and adjustment mechanism comprises an elastic member formed on each of the gas delivery tubes between the corresponding first end and the connection port,

wherein the elastic member comprises a portion of the gas delivery tube having a concertina structure,

wherein the portion of the gas delivery tube having the concertina structure is, in use, positioned in contact with a region of the patient's head superior to the patient's otobasion superior, and

wherein the tab is positioned on the gas delivery tube between the portion of the gas delivery tube having the concertina structure and the first end.

2. A patient interface as claimed in claim 1 , further comprising an elastic sleeve covering each of the two gas delivery tubes.

3. A patient interface as claimed in claim 2 , wherein the elastic sleeve is formed from an elastic material.

4. A patient interface as claimed in claim 1 , wherein the positioning and stabilising structure is configured such that, in use, the bias and adjustment mechanism is positioned so as not to contact the patient's face.

5. A patient interface as claimed in claim 1 , wherein the positioning and stabilising structure is configured such that, in use, the bias and adjustment mechanism is positioned so as not to contact the patient's cheek region.

6. A patient interface as claimed in claim 1 , wherein the positioning and stabilising structure is configured such that, in use, the bias and adjustment mechanism is positioned superior to the otobasion superior of the patient's head.

7. A patient interface as claimed in claim 1 , wherein each of the gas delivery tubes is configured to extend, in use, across the patient's corresponding cheek region.

8. A patient interface as claimed in claim 1 , wherein the positioning and stabilising structure is free of any mechanisms for enabling length adjustment of each of the two gas delivery tubes at a portion of each of the gas delivery tubes that is configured to contact the patient's head inferior to the otobasion superior of the patient's head.

9. A patient interface as claimed in claim 1 , wherein the positioning and stabilising structure is free of any mechanisms for enabling length adjustment of each of the two gas delivery tubes at a portion of each of the gas delivery tubes that is configured to extend, in use, across the patient's cheek regions.

10. A patient interface as claimed in claim 1 , wherein each of the two gas delivery tubes is configured to extend, in use, between the patient's corresponding eye and the patient's corresponding ear.

11. A patient interface as claimed in claim 1 , wherein an angle of the length-adjustable rear strap relative to each of the gas delivery tubes is adjustable to allow the length-adjustable rear strap to fit around the patient's head at a different locations.

12. A patient interface as claimed in claim 1 , wherein the bias and adjustment mechanism is configured to be positioned, in use, above a point of connection of the length-adjustable rear strap to each of the two gas delivery tubes, and the positioning and stabilising structure is free of any mechanisms for enabling length adjustment of each of the two gas delivery tubes positioned below the point of connection of the length-adjustable rear strap to each of the two gas delivery tubes.

13. A patient interface as claimed in claim 1 , wherein the length-adjustable rear strap comprises a loop material and a hook material portion, the loop material and the hook material portion being configured to removably connect the length-adjustable rear strap to the tab.

14. A patient interface as claimed in claim 1 , wherein each of the two gas delivery tubes varies in width and diameter along the length of each concertina structure.

15. A patient interface as claimed in claim 14 , wherein each of the two gas delivery tubes tapers along the length of each concertina structure so that the width and diameter of each of the two gas delivery tubes at one end of the concertina structure is smaller than the width and diameter of each of the two gas delivery tubes at the other end of concertina structure.

16. A patient interface as claimed in claim 1 , further comprising an elbow including a first end rotatably connected to the positioning and stabilising structure at the connection port and a second end having a swivel configured to be connected to the air circuit, the elbow being rotatable 360° about the connection port, the swivel being rotatable 360° about the second end of the elbow, and the elbow being configured to direct the flow of air from the air circuit to the gas delivery tubes via the connection port.

17. A patient interface as claimed in claim 1 , further comprising:

an elastic sleeve covering each of the two gas delivery tubes, the elastic sleeve being formed from an elastic material; and

an elbow including a first end rotatably connected to the positioning and stabilising structure at the connection port and a second end having a swivel configured to be connected to the air circuit, the elbow being rotatable 360° about the connection port, the swivel being rotatable 360° about the second end of the elbow, and the elbow being configured to direct the flow of air from the air circuit to the gas delivery tubes via the connection port,

wherein the positioning and stabilising structure is configured such that, in use, the bias and adjustment mechanism is positioned so as not to contact the patient's face,

wherein each of the two gas delivery tubes is configured to extend, in use, between the patient's corresponding eye and the patient's corresponding ear,

wherein the length-adjustable rear strap comprises a loop material and a hook material portion, the loop material and the hook material portion being configured to removably connect the length-adjustable rear strap to the tab,

wherein each of the two gas delivery tubes varies in width and diameter along the length of each concertina structure, and

wherein each of the two gas delivery tubes tapers along the length of each concertina structure so that the width and diameter of each of the two gas delivery tubes at one end of the concertina structure is smaller than the width and diameter of each of the two gas delivery tubes at the other end of concertina structure.

18. A patient interface as claimed in claim 1 , wherein the tab is positioned on each of the two gas delivery tubes between a lower end of the portion of the gas delivery tube having the concertina structure and the first end.

19. A patient interface as claimed in claim 1 , wherein each of the gas delivery tubes includes the tab projecting outwardly therefrom in a generally posterior direction relative to the patient's head in use,

wherein each end of the length-adjustable rear strap is configured to pass through the hole of a corresponding tab to removably connect the length-adjustable rear strap to the gas delivery tube, and

wherein each tab is positioned on the corresponding gas delivery tube between the portion of the gas delivery tube having the concertina structure and the first end.

20. A patient interface for sealed delivery of a flow of air at a therapeutic pressure of at least 4 cmH 2 O with respect to ambient air pressure throughout the patient's respiratory cycle in use, the patient interface comprising:

a cushion assembly comprising:

a plenum chamber pressurisable to the therapeutic pressure, said plenum chamber including a pair of plenum chamber inlet ports, each of the plenum chamber inlet ports being sized and structured to receive a flow of air at the therapeutic pressure for breathing by a patient; and

a seal-forming structure constructed and arranged to seal with a region of the patient's face surrounding an entrance to the patient's airways such that the flow of air at said therapeutic pressure is delivered to at least an entrance to the patient's nares, the seal-forming structure constructed and arranged to maintain said therapeutic pressure in the plenum chamber throughout the patient's respiratory cycle in use;

a positioning and stabilising structure configured to hold the seal-forming structure in a therapeutically effective position on a head of a patient, the positioning and stabilising structure comprising:

two gas delivery tubes, each of the gas delivery tubes being connected at a first end to a corresponding one of plenum chamber inlet ports to deliver the flow of air to the entrance to the patient's airways, each of the gas delivery tubes being configured to be positioned on a corresponding lateral side of the patient's head in use, at least one of the gas delivery tubes having a tab projecting outwardly therefrom in a generally posterior direction relative to the patient's head in use, the tab having a hole, each of the gas delivery tubes being constructed and arranged to contact, in use, at least a region of the patient's head superior to an otobasion superior of the patient's head, each of the gas delivery tubes including a concertina section configured to allow length adjustment of the corresponding gas delivery tube through a continuous range of lengths to fit different size heads, and the concertina section being configured to impart a biasing force along the corresponding gas delivery tube to urge the cushion assembly against the patient's face in use;

a length-adjustable rear strap, an end of the length-adjustable rear strap being configured to pass through the hole of the tab to removably connect the length-adjustable rear strap to the gas delivery tube to the two gas delivery tubes and the length-adjustable rear strap being configured, in use, to engage a posterior portion of the patient's head; and

a connection port configured to fluidly connect, in use, the gas delivery tubes with an air circuit to deliver the flow of air to the patient's airways, the connection port being configured to be located, in use, superior to the patient's head,

wherein the concertina section being positioned between the corresponding first end and the connection port to contact a region of the patient's head superior to the patient's otobasion superior in use, and

wherein the tab is positioned on the gas delivery tube between the concertina section and the first end.

21. A patient interface as claimed in claim 20 , further comprising an elastic sleeve covering each of the two gas delivery tubes, the elastic sleeve being formed from an elastic material.

22. A patient interface as claimed in claim 20 , wherein an angle of the length-adjustable rear strap relative to each of the gas delivery tubes is adjustable to allow the length-adjustable rear strap to fit around the patient's head at a different locations.

23. A patient interface as claimed in claim 20 , wherein the positioning and stabilising structure is configured such that, in use, the concertina section is positioned so as not to contact the patient's face.

24. A patient interface as claimed in claim 20 , wherein each of the two gas delivery tubes is configured to extend, in use, between the patient's corresponding eye and the patient's corresponding ear.

25. A patient interface as claimed in claim 20 , wherein the length-adjustable rear strap comprises a loop material and a hook material portion, the loop material and the hook material portion being configured to removably connect the length-adjustable rear strap to the tab.

26. A patient interface as claimed in claim 20 , further comprising an elbow including a first end rotatably connected to the positioning and stabilising structure at the connection port and a second end having a swivel configured to be connected to the air circuit, the elbow being rotatable 360° about the connection port, the swivel being rotatable 360° about the second end of the elbow, and the elbow being configured to direct the flow of air from the air circuit to the gas delivery tubes via the connection port.

27. A patient interface as claimed in claim 20 , wherein each of the two gas delivery tubes tapers along the length of each concertina section so that the width and diameter of each of the two gas delivery tubes at one end of the concertina section is smaller than the width and diameter of each of the two gas delivery tubes at the other end of the concertina section.

28. A patient interface as claimed in claim 20 , further comprising:

an elastic sleeve covering each of the two gas delivery tubes; and

an elbow including a first end rotatably connected to the positioning and stabilising structure at the connection port and a second end having a swivel configured to be connected to the air circuit, the elbow being rotatable 360° about the connection port, the swivel being rotatable 360° about the second end of the elbow, and the elbow being configured to direct the flow of air from the air circuit to the gas delivery tubes via the connection port,

wherein the elastic sleeve is formed from an elastic material,

wherein the positioning and stabilising structure is configured such that, in use, the concertina section is positioned so as not to contact the patient's face,

wherein each of the two gas delivery tubes is configured to extend, in use, between the patient's corresponding eye and the patient's corresponding ear,

wherein the length-adjustable rear strap comprises a loop material and a hook material portion, the loop material and the hook material portion being configured to removably connect the length-adjustable rear strap to the tab, and

wherein each of the two gas delivery tubes tapers along the length of each concertina section so that the width and diameter of each of the two gas delivery tubes at one end of the concertina section is smaller than the width and diameter of each of the two gas delivery tubes at the other end of the concertina section.

29. A patient interface as claimed in claim 20 , wherein the tab is positioned on each of the two gas delivery tubes between a lower end of the concertina section and the corresponding first end.

30. A patient interface as claimed in claim 20 , wherein each of the gas delivery tubes includes the tab projecting outwardly therefrom in a generally posterior direction relative to the patient's head in use,

wherein each end of the length-adjustable rear strap is configured to pass through the hole of a corresponding tab to removably connect the length-adjustable rear strap to the gas delivery tube, and

wherein each tab is positioned on the corresponding gas delivery tube between the portion of the gas delivery tube having the concertina section and the first end.