Headgear tubing for a patient interface

1. A positioning and stabilising structure to provide a force to hold a seal-forming structure in a therapeutically effective position on a patient's head for positive pressure airway treatment of sleep disordered breathing, the positioning and stabilising structure comprising:

at least one gas delivery tube to deliver a flow of air to an entrance of the patient's airways via a seal-forming structure, each gas delivery tube 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 gas delivery tube comprising a tube wall defining a hollow interior through which air is able to flow to the seal-forming structure, each gas delivery tube comprising:

a superior tube portion configured to extend in use from a position on top of the patient's head to a position along the side of the patient's head or face, the superior tube portion comprising 1) a textile material and/or a foam material, and 2) an air-impermeable material provided to the textile material and/or the foam material to make the superior tube portion substantially air-impermeable; and

an inferior tube portion configured to extend from the position along the side of the patient's head or face to a position adjacent the entrance to the patient's airways, the inferior tube portion comprising 1) a textile material and/or a foam material, and 2) an air-impermeable material provided to the textile material and/or the foam material of the inferior tube portion to make the inferior tube portion substantially air-impermeable,

wherein one of the inferior tube portion and superior tube portion has a greater rigidity than the other of the inferior tube portion and superior tube portion, and

wherein each of the superior tube portion and the inferior tube portion comprises a plurality of layers adhered to one another including 1) at least one outer layer and 2) an inner portion with at least one inner layer, wherein the inner portion of one of the superior tube portion or the inferior tube portion has greater rigidity than the inner portion of the other of the superior tube portion or inferior tube portion.

2. The positioning and stabilising structure of claim 1 , wherein the superior tube portion comprises a first end configured to lie against a superiorly-facing surface of the patient's head in use and a second end configured to lie against a laterally-facing surface of the patient's head in use.

3. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion comprises a first end configured to lie against a laterally-facing surface of the patient's head in use and a second end configured to connect with the seal-forming structure.

4. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion is configured to fluidly connect the superior tube portion with the seal-forming structure in use.

5. The positioning and stabilising structure of claim 1 , wherein the superior tube portion is adapted to receive the flow of air from a source via a crown connector arranged to be positioned on top of the patient's head in use.

6. The positioning and stabilising structure of claim 1 , further comprising a crown connector,

wherein the at least one gas delivery tube comprises a pair of gas delivery tubes, and the crown connector is configured to lie on top of the patient's head in use to fluidly connect between the pair of gas delivery tubes, and

wherein the crown connector comprises a hollow interior and a fluid connection opening configured to receive the flow of air into the hollow interior.

7. The positioning and stabilising structure of claim 1 , wherein one of the inferior tube portion or the superior tube portion is configured with a first layer of material and a second layer of material, wherein the first layer of material is more rigid than the second layer of material.

8. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion and/or the superior tube portion is configured with a rigidising element to provide rigidity to the inferior tube portion and/or the superior tube portion.

9. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion and/or the superior tube portion is configured with a seam.

10. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion is formed as a first tube and the superior tube portion is formed as a second tube, wherein the first tube is joined to the second tube.

11. The positioning and stabilising structure of claim 10 , wherein the first tube is joined to the second tube by thermoforming, ultrasonic welding, stitching, gluing or removably connectable connectors.

12. The positioning and stabilising structure of claim 1 , wherein each gas delivery tube has a patient contacting portion configured to contact the patient in use and a non-patient contacting portion positioned away from the patient in use, and

wherein the patient contacting portion and/or the non-patient contacting portion comprises a plurality of layers.

13. The positioning and stabilising structure of claim 12 , wherein the patient contacting portion includes a first outer later comprising a textile material or a foam material.

14. The positioning and stabilising structure of claim 12 , wherein the non-patient contacting portion includes a second outer layer comprising a textile material or a foam material.

15. The positioning and stabilising structure of claim 12 , wherein the patient contacting portion and/or the non-patient contacting portion includes an intermediate layer comprising a foam material or a spacer fabric material.

16. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion has greater rigidity than the superior tube portion.

17. The positioning and stabilising structure of claim 16 , wherein the inferior tube portion has a wall thickness that is greater than a wall thickness of the superior tube portion to provide greater rigidity to the inferior tube portion.

18. The positioning and stabilising structure of claim 17 , wherein the inferior tube portion comprises materials that are less extendible in length than materials of the superior tube portion, thereby providing greater rigidity to the inferior tube portion.

19. The positioning and stabilising structure of claim 16 , wherein the inferior tube portion has at least one additional layer not provided to the superior tube portion to provide greater rigidity to the inferior tube portion.

20. The positioning and stabilising structure of claim 16 ,

wherein a rigidising element is provided to one of the plurality of layers to provide greater rigidity to the inferior tube portion.

21. The positioning and stabilising structure of claim 16 , wherein the inferior tube portion comprises a greater number of layers than the superior tube portion, thereby providing greater rigidity to the inferior tube portion.

22. The positioning and stabilising structure of claim 16 , wherein the superior tube portion and inferior tube portion each comprises a textile layer, the textile layer in the inferior tube portion having a woven structure that is different than a woven structure of the textile layer in the superior tube portion,

wherein the woven structure of the inferior tube portion provides greater rigidity to the inferior tube portion as compared to the superior tube portion.

23. The positioning and stabilising structure of claim 1 , wherein the inferior tube portion comprises a greater resistance to bending towards an inferior direction than towards a medial direction, in use.

24. The positioning and stabilising structure of claim 1 , wherein the superior tube portion comprises a greater resistance to bending towards an anterior direction and/or a posterior direction than towards an inferior direction in use.

25. The positioning and stabilising structure of claim 1 , wherein the superior tube portion has greater rigidity than the inferior tube portion.

26. The positioning and stabilising structure of claim 1 , wherein the inner portion of the inferior tube portion includes a plurality of inner layers.

27. The positioning and stabilising structure of claim 26 , wherein the inner portion of the superior tube portion includes a plurality of inner layers.

28. The positioning and stabilising structure of claim 1 , wherein the at least one gas delivery tube comprises a pair of gas delivery tubes configured to, in use, extend along respective sides of the patient's head,

said positioning and stabilising structure further comprising a rear strap having first and second end portions respectively connected to the pair of gas delivery tubes, the rear strap being configured to engage a rear portion of the patient's head in use.

29. The positioning and stabilising structure of claim 28 , wherein each gas delivery tube includes a strap connection portion having a slit formed therein to adjustably receive a respective one of the first and second end portions of the rear strap.

30. The positioning and stabilising structure of claim 29 , wherein each gas delivery tube includes a transition zone between the superior tube portion and the inferior tube portion, the transition zone being in an area of the strap connection portion.

31. The positioning and stabilising structure of claim 30 , wherein each strap connection portion forms a tab that extends from a respective one of the gas delivery tubes.

32. A patient interface comprising:

a seal-forming structure constructed and arranged to form a seal with a region of the patient's face surrounding an entrance to the patient's airways for sealed delivery of a flow of air at a therapeutic pressure of at least 6 cmH2O above ambient air pressure throughout the patient's respiratory cycle in use; and

the positioning and stabilising structure of claim 1 to provide a force to hold the seal-forming structure in a therapeutically effective position on the patient's head for positive pressure airway treatment of sleep disordered breathing.

33. The positioning and stabilising structure of claim 32 , wherein the inferior tube portion has greater rigidity than the superior tube portion to allow for efficient transmittal and conversion of headgear forces into force vectors to facilitate sealing of the seal-forming structure with the patient's face.