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 including a flexible silicone base portion and a sealing portion provided to and supported by the flexible silicone base portion, the flexible silicone base portion at least partially forming a plenum and having a lower portion disposed on a first side of the plenum with an aperture formed therein for receiving a supply of air from an air delivery tube, said lower portion forming a first decoupling assembly to decouple external forces from the sealing portion, the first decoupling assembly including a flexible portion configured to flex in response to forces applied by the air delivery tube;

the aperture being disposed, in use, at a central portion, in a left-right direction, of a non-patient contacting side of the patient interface structures;

the lower portion of the flexible silicone base portion including a flange extending around the aperture;

a swivel connector directly connected to the flange, the swivel connector being adapted to receive a fluid connector to couple the patient interface structure with the air delivery tube; 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 flexible seal positioning and stabilizing structure including:

a pair of main straps respectively connected to a corresponding side of the patient interface structure.

2. The patient interface system of claim 1 , further comprising the air delivery tube adapted to deliver the supply of air to the patient interface structure, wherein, in use, the external forces are applied by the air delivery tube.

3. The patient interface system of claim 2 , further comprising the fluid connector to connect the air delivery tube to the patient interface structure.

4. The patient interface system of claim 3 , wherein the fluid connector is an elbow, and wherein the swivel connector permits the elbow to rotate with respect to the patient interface structure.

5. The patient interface system of claim 4 , wherein the elbow includes a vent to permit removal of exhaust gases.

6. The patient interface system of claim 1 , wherein the flexible portion of the first decoupling assembly comprises silicone material of the flexible silicone base portion that immediately surrounds the flange.

7. The patient interface system of claim 1 , wherein the sealing portion comprises a foam material configured to seal against the patient's face in use, the foam material including only a single aperture formed therein and configured to, in use, deliver the supply of air to both of the patient's nares.

8. The patient interface system of claim 1 , wherein the patient interface structure is a nasal interface, and the sealing portion is configured to seal above the tip of the patient's nose in use.

9. The patient interface system of claim 1 , wherein the pair of main straps is configured to, in use, engage a corresponding side of the patient's face between the patient's eye and ear.

10. The patient interface system of claim 1 , wherein the pair of main straps comprises a silicone material.

11. The patient interface system of claim 1 , wherein each main strap is integrally formed with the flexible silicone base portion of the patient interface structure.

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

13. The patient interface system of claim 1 , wherein each main strap has a patient interface structure connector configured to be removably connected to a corresponding side of the patient interface structure.

14. The patient interface system of claim 13 , wherein each main strap comprises silicone and is formed as a one-piece structure.

15. The patient interface system of claim 13 , 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 straps to connect the flexible seal positioning and stabilizing structure to the patient interface structure.

16. The patient interface system of claim 15 , wherein the left and right connectors are integrally formed with the patient interface structure.

17. The patient interface system of claim 1 , further comprising an adjustable rear strap connected at respective end portions thereof to the main straps of the flexible 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.

18. The patient interface system of claim 17 , wherein each main strap includes a strap connector, the respective end portions of the rear strap being removably and adjustably connected to the strap connectors.

19. The patient interface system of claim 18 , wherein each strap connector includes a slot to receive a corresponding end portion of the rear strap.

20. The patient interface system of claim 1 , further comprising a top strap connected at respective end portions thereof to respective end portions of the main straps and being configured to, in use, extend over the top of the patient's head.