Patient interface systems

1. A patient interface system for delivery of a supply of air at positive pressure to an entrance of a patient's airways for treatment of sleep disordered breathing, the patient interface system comprising:

a patient interface structure comprising a flexible one-piece silicone structure at least partially forming a plenum having a seal provided thereto, the seal being adapted to, in use, engage and form a seal with the underside of the patient's nose; and

a flexible seal positioning and stabilizing structure to position and stabilize the patient interface structure in sealing engagement with the patient's airways, the seal positioning and stabilizing structure including:

a pair of main portions comprising a silicone material, each main portion being formed as one-piece and configured to, in use, engage a corresponding side of the patient's face between the patient's eye and ear, each main portion having a patient interface structure connector provided at a bottom portion thereof, each patient interface structure connector being removably connected to a corresponding side of the patient interface structure; and

an adjustable rear strap connected at respective end portions thereof to the main portions of the seal positioning and stabilizing structure and being configured to, in use, extend around the back of the patient's head at a position above the patient's ears.

2. The patient interface system of claim 1 , wherein each main portion includes a strap connector, the respective end portions of the rear strap being removably and adjustably connected to the strap connectors.

3. The patient interface system of claim 2 , wherein each strap connector includes a slot to receive a corresponding end portion of the rear strap.

4. The patient interface system of claim 3 , wherein each main portion has a top portion that is opposite the bottom portion and arranged to, in use, be positioned on top of the patient's head.

5. The patient interface system of claim 4 , wherein the rear strap is connected to a corresponding strap connector at a location between the bottom portion and the top portion of a corresponding main portion.

6. The patient interface system of claim 2 , wherein each strap connector is positioned along a curve of a corresponding main portion, and an intermediate portion of each main portion is arranged to be positioned, in use, between the patient's eye and ear.

7. The patient interface system of claim 1 , wherein the silicone of the main portions has a matte finish on a first side arranged to face the patient and on a second side arranged to face away from the patient.

8. The patient interface system of claim 1 , wherein the silicone of the main portions has a Shore A hardness in the range of about 40 to about 80.

9. The patient interface system of claim 1 , wherein each main portion has a width of about 5 mm to 25 mm.

10. The patient interface system of claim 1 , wherein the main portions form a loop that is configured to, in use, extend from adjacent an underside of the patient's nose to an area at or adjacent to the crown of the patient's head.

11. The patient interface system of claim 1 , wherein the patient interface structure includes left and right connectors disposed on opposing sides thereof, the left and right connectors being configured to connect, respectively, to the patient interface structure connectors of the main portions to connect the seal positioning and stabilizing structure to the patient interface structure.

12. The patient interface system of claim 11 , wherein the left and right connectors are integrally formed with the patient interface structure.

13. The patient interface system of claim 1 , wherein at least one side of the patient interface structure has indicia which corresponds to indicia of a corresponding main portion of the seal positioning and stabilizing structure to indicate the correct main portion to connect to the at least one side of the patient interface structure.

14. The patient interface system of claim 1 , wherein the main portions are configured to stretch, bend and/or flex to assist in decoupling forces applied to the patient interface structure.

15. The patient interface system of claim 1 , further comprising a decoupling arrangement configured to decouple forces applied by an air delivery tube on the patient interface system such that the forces are decoupled from the seal.

16. The patient interface system of claim 15 , wherein the decoupling arrangement forms a flexible connection to link the patient interface structure to the air delivery tube.

17. The patient interface system of claim 15 , wherein the decoupling arrangement includes a swivel ring and a swivel elbow swivelably coupled to the swivel ring to allow the air delivery tube, when coupled to the elbow, to be movable relative to the swivel ring to decouple tube drag forces.

18. The patient interface system of claim 17 , wherein the patient interface structure is coupled to the swivel elbow.

19. The patient interface system of claim 1 , wherein the one-piece silicone structure includes a flexible base and the seal, the seal being supported by the flexible base.

20. The patient interface system of claim 19 , wherein the flexible base at least partially forms the plenum.

21. The patient interface system of claim 20 , wherein the flexible base is configured to, in use, wrap around the underside of the patient's nose when under tension to accommodate different facial geometries.

22. The patient interface system of claim 1 , wherein the patient interface structure is configured to conform to the patient's mouth region to avoid interference with the area around the patient's mouth.

23. The patient interface system of claim 1 , wherein the seal includes only a single aperture configured to, in use, deliver the supply of air to both of the patient's nares.

24. The patient interface system of claim 1 , wherein the pair of main portions is molded from silicone as a single piece.

25. The patient interface system of claim 1 , wherein each main portion includes a strap connector, the respective end portions of the rear strap being removably and adjustably connected to the strap connectors,

wherein each strap connector includes a slot to receive a corresponding end portion of the rear strap,

wherein each main portion has a top portion that is opposite the bottom portion and arranged to, in use, be positioned on top of the patient's head,

wherein the rear strap is connected to a corresponding strap connector at a location between the bottom portion and the top portion of a corresponding main portion,

wherein each strap connector is positioned along a curve of a corresponding main portion, an intermediate portion of each main portion being arranged to be positioned, in use, between the patient's eye and ear,

wherein the silicone of the main portions has a matte finish on a first side arranged to face the patient and on a second side arranged to face away from the patient, and

wherein each main portion has a width of about 5 mm to 25 mm.

26. The patient interface system of claim 1 , wherein the seal includes only a single aperture configured to, in use, deliver the supply of air to both of the patient's nares,

wherein the main portions form a loop that is configured to, in use, extend from adjacent an underside of the patient's nose to an area at or adjacent to the crown of the patient's head,

wherein the patient interface structure includes left and right connectors disposed on opposing sides thereof, the left and right connectors being configured to connect, respectively, to the patient interface structure connectors of the main portions to connect the seal positioning and stabilizing structure to the patient interface structure, and

wherein at least one side of the patient interface structure has indicia which corresponds to indicia of a corresponding main portion of the seal positioning and stabilizing structure to indicate the correct main portion to connect to the at least one side of the patient interface structure.

27. The patient interface system of claim 26 , wherein the pair of main portions is molded from silicone as a single piece.

28. The patient interface system of claim 1 , further comprising a decoupling arrangement configured to decouple forces applied by an air delivery tube on the patient interface system such that the forces are decoupled from the seal,

wherein the decoupling arrangement forms a flexible connection to link the patient interface structure to the air delivery tube,

wherein the decoupling arrangement includes a swivel ring and a swivel elbow swivelably coupled to the swivel ring to allow the air delivery tube, when coupled to the elbow, to be movable relative to the swivel ring to decouple tube drag forces,

wherein the main portions are configured to stretch, bend and/or flex to assist in decoupling forces applied to the patient interface structure,

wherein each main portion includes a strap connector, the respective end portions of the rear strap being removably and adjustably connected to the strap connectors, and

wherein each strap connector includes a slot to receive a corresponding end portion of the rear strap.

29. The patient interface system of claim 28 , wherein the one-piece silicone structure includes a flexible base and the seal, the seal being supported by the flexible base,

wherein the flexible base at least partially forms the plenum,

wherein the patient interface structure is configured to conform to the patient's mouth region to avoid interference with the area around the patient's mouth, and

wherein the flexible base is configured to, in use, wrap around the underside of the patient's nose when under tension to accommodate different facial geometries.

30. The patient interface system of claim 1 , further comprising a decoupling arrangement configured to decouple forces applied by an air delivery tube on the patient interface system such that the forces are decoupled from the seal,

wherein each main portion includes a strap connector, the respective end portions of the rear strap being removably and adjustably connected to the strap connectors,

wherein each strap connector includes a slot to receive a corresponding end portion of the rear strap,

wherein each main portion has a top portion that is opposite the bottom portion and arranged to, in use, be positioned on top of the patient's head,

wherein the main portions form a loop that is configured to, in use, extend from adjacent an underside of the patient's nose to an area at or adjacent to the crown of the patient's head,

wherein the rear strap is connected to an intermediate portion of each main portion located between the bottom portion and the top portion,

wherein the intermediate portion of each main portion extends along a curve and is arranged to be positioned, in use, between the patient's eye and ear,

wherein the seal includes a single aperture configured to, in use, deliver the supply of air to both of the patient's nares,

wherein the patient interface structure includes left and right connectors disposed on opposing sides thereof, the left and right connectors being configured to connect, respectively, to the patient interface structure connectors of the main portions to connect the seal positioning and stabilizing structure to the patient interface structure, and

wherein at least one side of the patient interface structure has indicia which corresponds to indicia of a corresponding main portion of the seal positioning and stabilizing structure to indicate the correct main portion to connect to the at least one side of the patient interface structure,

wherein the one-piece silicone structure includes a flexible base and the seal, the seal being supported by the flexible base, and

wherein the flexible base at least partially forms the plenum.