Swivel elbow and connector assembly for patient interface systems

1. A patient interface assembly configured to deliver a flow of breathable gas under positive pressure to a patient, the patient interface assembly comprising:

a cushion assembly comprising:

a flexible cushion including a base and a pair of nasal pillows that extend from the base, the pair of nasal pillows being configured to sealingly engage the patient's nasal airways, the base forming at least part of a plenum chamber and comprising a central opening configured to receive the flow of breathable gas; and

an air delivery tube; and

a connector assembly that connects the air delivery tube to the cushion assembly, the connector assembly comprising:

an elbow having a first end connected to the air delivery tube, the elbow having a second end with a part spherical ball shape, the elbow having a gas washout vent with a plurality of vent openings; and

an elbow connector forming a part spherical socket shape that engages the part spherical ball shape of the second end of the elbow, wherein the elbow connector comprises an anchoring flange at a posterior end of the elbow connector, the anchoring flange being configured to secure the flexible cushion to the elbow connector by way of the anchoring flange being inserted into the plenum chamber through the central opening in the flexible cushion,

wherein the anchoring flange forms part of a channel around an outer circumferential surface of the elbow connector, the channel being configured to receive a portion of the flexible cushion,

wherein the channel is open in a direction that is radially outward from a central axis of the elbow connector, and

wherein the anchoring flange forms a first wall of the channel that opposes a second wall of the channel, the first and second walls of the channel having different heights as measured from a bottom of the channel, wherein the bottom of the channel faces the direction that is radially outward from the central axis of the elbow connector.

2. The patient interface assembly of claim 1 , wherein the anchoring flange extends radially outward from the elbow connector.

3. The patient interface assembly of claim 1 , wherein the elbow connector comprises a bore that extends from an anterior end of the elbow connector to the posterior end of the elbow connector, and wherein a cross-section of at least a portion of a circumferential wall of the bore has a concave shape.

4. The patient interface assembly of claim 3 , wherein the flexible cushion comprises a flexible flange surrounding the central opening of the base, the flexible flange of the flexible cushion overlapping the anchoring flange when the flexible cushion is secured to the elbow connector.

5. The patient interface assembly of claim 4 , wherein the flexible flange of the flexible cushion extends radially inward toward a center of the central opening in the base, flexible cushion is attached to the elbow connector by way of an interference fit.

6. The patient interface assembly of claim 1 , further comprising a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors.

7. The patient interface assembly of claim 1 , wherein the elbow connector is more rigid than the flexible cushion.

8. The patient interface assembly of claim 1 , further comprising a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors,

wherein an inner surface of the elbow connector forms the part spherical ball shape,

wherein the anchoring flange extends radially outward from the elbow connector,

wherein the elbow connector comprises a bore that extends from an anterior end of the elbow connector to the posterior end of the elbow connector,

wherein a cross-section of at least a portion of a circumferential wall of the bore has a concave shape,

wherein the flexible cushion comprises a flexible flange surrounding the central opening of the base, the flexible flange of the flexible cushion overlapping the anchoring flange when the flexible cushion is secured to the elbow connector,

wherein the elbow connector is more rigid than the flexible cushion, and

wherein the flexible flange of the flexible cushion extends radially inward toward a center of the central opening in the base.

9. The patient interface assembly of claim 1 , further comprising:

a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors,

a positioning and stabilizing system attachable to the headgear connectors and configured to support the flexible cushion on the patient's face; and

the air delivery tube configured to be connected to the elbow.

10. A respiratory system configured to deliver a pressurized flow of breathable gas to a patient, the respiratory system comprising:

a flow generator configured to pressurize the flow of breathable gas; and

the patient interface assembly of claim 9 ,

wherein the patient interface assembly is configured to receive the pressurized flow of breathable gas from the flow generator and deliver the pressurized flow of breathable gas to the patient.

11. The patient interface assembly of claim 1 , wherein the anchoring flange is non-circular, and wherein the cross-sectional shape of the connector assembly is different at an anterior end than at the posterior end.

12. A patient interface assembly configured to deliver a flow of breathable gas to a patient, the patient interface assembly comprising:

a flexible cushion comprising:

a base that forms a plenum chamber, the base comprising a central opening configured to receive the flow of breathable gas and a flexible flange surrounding the central opening; and

a pair of nasal pillows that extend from the base and are configured to sealingly engage the patient's nasal airways; and

a connector assembly comprising:

an elbow configured to connect to an air delivery tube and comprising a gas washout vent with a plurality of vent openings; and

an elbow connector removably attached to the flexible cushion,

wherein an exterior surface of the elbow connector that extends along a perimeter of the elbow connector forms at least part of a circumferential channel,

wherein the flexible cushion is configured to be secured to the elbow connector by way of the flexible flange of the flexible cushion being received within the circumferential channel,

wherein the circumferential channel is open in a direction that is radially outward from a central axis of the elbow connector,

wherein the elbow connector is attached to the elbow by way of a ball-and-socket connection so that the elbow is movable relative to the elbow connector, and

wherein a first wall of the channel opposes a second wall of the channel, the first and second walls of the channel having different heights as measured from a bottom of the channel.

13. The patient interface assembly of claim 12 , wherein the elbow comprises a first end configured to be attached to the air delivery tube and a second end attached to the elbow connector, the second end of the elbow forming the ball part of the ball-and-socket connection.

14. The patient interface assembly of claim 12 , wherein the elbow connector comprises an anterior end, a posterior end, and a bore that extends from the anterior end to the posterior end, and wherein a cross-section of at least a portion of a circumferential wall of the bore is arcuate.

15. The patient interface assembly of claim 12 , wherein the flexible flange of the flexible cushion extends radially inward toward a center of the central opening in the base, and

wherein the elbow connector is more rigid than the flexible cushion.

16. The patient interface assembly of claim 12 , further comprising a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors.

17. The patient interface assembly of claim 12 , further comprising a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors,

wherein the elbow comprises a first end configured to be attached to the air delivery tube and a second end attached to the elbow connector, the second end of the elbow forming the ball part of the ball-and-socket connection,

wherein the elbow connector comprises an anterior end, a posterior end, and a bore that extends from the anterior end to the posterior end, and wherein a cross-section of at least a portion of a circumferential wall of the bore is arcuate,

wherein the flexible flange of the flexible cushion extends radially inward toward a center of the central opening in the base,

wherein the elbow connector is more rigid than the flexible cushion, and

wherein the flexible cushion is attached to the elbow connector by way of an interference fit.

18. The patient interface assembly of claim 12 , further comprising:

a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors,

a positioning and stabilizing system attachable to the headgear connectors and configured to support the flexible cushion on the patient's face; and

the air delivery tube configured to be connected to the elbow.

19. A respiratory system configured to deliver a pressurized flow of breathable gas to a patient, the respiratory system comprising:

a flow generator configured to pressurize the flow of breathable gas; and

the patient interface assembly of claim 18 ,

wherein the patient interface assembly is configured to receive the pressurized flow of breathable gas from the flow generator and deliver the pressurized flow of breathable gas to the patient.

20. A patient interface assembly configured to deliver a flow of breathable gas under positive pressure to a patient, the patient interface assembly comprising:

a cushion assembly comprising a flexible cushion including a base and a pair of nasal pillows that extend from the base, the pair of nasal pillows being configured to sealingly engage the patient's nasal airways, the base forming at least part of a plenum chamber and comprising a central opening configured to receive the flow of breathable gas; and

a connector assembly that connects an air delivery tube to the cushion assembly, the connector assembly comprising:

an elbow having a first end connected to the air delivery tube, the elbow having a second end with a part spherical ball shape, the elbow having a gas washout vent with a plurality of vent openings; and

an elbow connector forming a part spherical socket shape that engages the part spherical ball shape of the second end of the elbow, wherein the elbow connector comprises an anchoring flange at a posterior end of the elbow connector, the anchoring flange being configured to secure the flexible cushion to the elbow connector by way of the anchoring flange being inserted into the plenum chamber through the central opening in the flexible cushion,

wherein the anchoring flange forms part of a channel around an outer circumferential surface of the elbow connector that extends along the perimeter of the elbow connector, the channel being configured to receive a portion of the cushion assembly,

wherein the channel is open in a direction that is radially outward from a central axis of the elbow connector, and

wherein the anchoring flange forms a first wall of the channel that opposes a second wall of the channel, the first and second walls of the channel having different heights as measured from a bottom of the channel.

21. The patient interface assembly of claim 20 , wherein the anchoring flange extends radially outward from the elbow connector.

22. The patient interface assembly of claim 20 , wherein the elbow connector comprises a bore that extends from an anterior end of the elbow connector to the posterior end of the elbow connector, and wherein a cross-section of at least a portion of a circumferential wall of the bore has a concave shape.

23. The patient interface assembly of claim 22 , wherein the flexible cushion comprises a flexible flange surrounding the central opening of the base, the flexible flange of the flexible cushion overlapping the anchoring flange when the flexible cushion is secured to the elbow connector.

24. The patient interface assembly of claim 23 , wherein the flexible flange of the flexible cushion extends radially inward toward a center of the central opening in the base, and

wherein the elbow connector is more rigid than the flexible cushion.

25. The patient interface assembly of claim 20 , further comprising a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors.

26. The patient interface assembly of claim 20 , further comprising a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors,

wherein an inner surface of the elbow connector forms the part spherical ball shape,

wherein the anchoring flange extends radially outward from the elbow connector,

wherein the elbow connector comprises a bore that extends from an anterior end of the elbow connector to the posterior end of the elbow connector,

wherein a cross-section of at least a portion of a circumferential wall of the bore has a concave shape,

wherein the flexible cushion comprises a flexible flange surrounding the central opening of the base, the flexible flange of the flexible cushion overlapping the anchoring flange when the flexible cushion is secured to the elbow connector,

wherein the elbow connector is more rigid than the flexible cushion, and

wherein the flexible flange of the flexible cushion extends radially inward toward a center of the central opening in the base.

27. The patient interface assembly of claim 20 , further comprising:

a pair of laterally extending arms that extend in opposite directions and comprise headgear connectors,

a positioning and stabilizing system attachable to the headgear connectors and configured to support the flexible cushion on the patient's face; and

the air delivery tube configured to be connected to the elbow.

28. A respiratory system configured to deliver a pressurized flow of breathable gas to a patient, the respiratory system comprising:

a flow generator configured to pressurize the flow of breathable gas; and

the patient interface assembly of claim 27 ,

wherein the patient interface assembly is configured to receive the pressurized flow of breathable gas from the flow generator and deliver the pressurized flow of breathable gas to the patient.