Elbow assembly

1. An elbow assembly adapted to connect an air delivery tube to a mask assembly, the elbow assembly comprising:

an elbow body with a first end, a second end and a bend between the first and second ends;

a slot in a sidewall of the elbow body;

an anti-asphyxia valve (AAV) assembly with a flap portion adapted to be received within the slot;

a port on the sidewall of the elbow body adjacent the slot such that a portion of the sidewall of the elbow body intervenes between the slot and the port, the port being selectively closed by the flap portion; and

a support member having an inside surface to which the flap portion is attached, the support member and the flap portion as a unit being attached to the elbow body,

wherein the support member comprises an alignment member configured to cooperate with the elbow body to prevent assembly when the flap portion is misaligned with respect to the elbow body,

wherein the support member is adapted to be flush with the port when secured to the elbow body, and

wherein the support member is securable to the elbow body in only one orientation.

2. An elbow assembly according to claim 1 , wherein the elbow body comprises a flange proximate the second end, and the support member is adapted to abut the flange when secured to the elbow body.

3. An elbow assembly according to claim 1 , wherein only an outermost surface of the support member at one end of the support member is adapted to be flush with an outermost surface of the elbow body when the support member is secured to the elbow body.

4. An elbow assembly according to claim 1 , wherein the support member comprises grip members that protrude outward from the elbow body when the support member is clipped to the elbow body.

5. An elbow assembly according to claim 1 , wherein the alignment member is adapted to cooperate with the elbow body to prevent the support member from being secured to the elbow body when the flap portion is misaligned with the support member.

6. An elbow assembly according to claim 1 , wherein the port is upstream of the slot.

7. An elbow assembly according to claim 1 , wherein the support member is configured to be removably secured to the elbow body.

8. An elbow assembly according to claim 1 , wherein the AAV assembly is configured to be removably secured to the support member.

9. An elbow assembly according to claim 1 , wherein at least part of the support member engages the elbow body at the bend.

10. An elbow assembly according to claim 1 , wherein the elbow assembly further comprises a member configured to prevent over-deflection of the flap portion through the port.

11. An elbow assembly according to claim 1 , wherein the flap portion comprises a flexible silicone or other elastic material.

12. An elbow assembly according to claim 1 , wherein the elbow body comprises a flange proximate the second end, and the support member is adapted to abut the flange when secured to the elbow body,

wherein only an outermost surface of the support member at one end of the support member is adapted to be flush with an outermost surface of the elbow body when the support member is secured to the elbow body,

wherein the support member comprises grip members that protrude outward from the elbow body when the support member is clipped to the elbow body,

wherein the alignment member is adapted to cooperate with the elbow body to prevent the support member from being secured to the elbow body when the flap portion is misaligned with the support member,

wherein the port is upstream of the slot,

wherein the support member is configured to be removably secured to the elbow body,

wherein the AAV assembly is configured to be removably secured to the support member,

wherein at least part of the support member engages the elbow body at the bend,

wherein the elbow assembly further comprises a member configured to prevent over-deflection of the flap portion through the port, and

wherein the flap portion comprises a flexible silicone or other elastic material.

13. An elbow assembly adapted to connect an air delivery tube to a mask assembly, the elbow assembly comprising:

an elbow body with a first end attachable to a mask assembly, a second end attachable to a swivel connection and a bend between the first and second ends;

an aperture in the elbow body, at least a portion of which is between the bend and the second end of the elbow body;

an anti-asphyxia valve (AAV) with a flap portion that is received within the aperture;

a port on the elbow body adjacent to the aperture and between the aperture and the first end, the port being configured to be selectively closed by the flap portion; and

a clip member adapted to cover the aperture and secure the AAV to the elbow,

wherein the clip member comprises grip members configured to guide the clip member as the clip member is press-fit onto the elbow body, the grip members projecting away from the elbow body when the clip member is secured to the elbow body,

wherein the clip member is adapted to be flush with the port when secured to the elbow body, and

wherein the clip member is securable to the elbow body in only one orientation.

14. An elbow assembly according to claim 13 , wherein the grip members are configured to be pushed outward by the elbow body as the clip member is press-fit onto the elbow body.

15. An elbow assembly according to claim 13 , wherein the elbow body comprises a flange at the second end, the flange being positioned so that the swivel connection and the clip member abut the flange on opposite sides of the flange.

16. An elbow assembly according to claim 13 , wherein the clip member comprises an alignment member that cooperates with the flap portion to prevent the clip member from being secured to the elbow body when the flap portion is misaligned with the clip member.

17. An elbow assembly according to claim 13 , wherein the port is upstream of the aperture.

18. An elbow assembly according to claim 13 , wherein the clip member is configured to be removably secured to the elbow body.

19. An elbow assembly according to claim 13 , wherein the AAV is configured to be removably secured to the clip member.

20. An elbow assembly according to claim 13 , wherein the grip members are configured to be pushed outward by the elbow body as the clip member is press-fit onto the elbow body,

wherein the elbow body comprises a flange at the second end, the flange being positioned so that the swivel connection and the clip member abut the flange on opposite sides of the flange,

wherein the clip member comprises an alignment member that cooperates with the flap portion to prevent the clip member from being secured to the elbow body when the flap portion is misaligned with the clip member,

wherein the port is upstream of the aperture,

wherein the clip member is configured to be removably secured to the elbow body, and

wherein the AAV is configured to be removably secured to the clip member.

21. A facial mask assembly configured to deliver pressurized gas to a patient, the mask assembly comprising:

a frame;

a cushion provided to the frame and adapted to form a seal with the patient's face; and

an elbow assembly provided to the frame and adapted to be connected to an air delivery tube that delivers breathable gas to the patient, the elbow assembly comprising:

an elbow body with a first end attachable to the mask assembly, a second end attachable to a swivel connection and a bend between the first and second ends;

an aperture in the elbow body, at least a portion of which is between the bend and the second end of the elbow body;

an anti-asphyxia valve (AAV) with a flap portion that is received within the aperture;

a port on the elbow body adjacent to the aperture and between the aperture and the first end, the port being configured to be selectively closed by the flap portion; and

a clip member having an inside surface to which the flap portion is attached, the clip member and the flap portion as a unit being attached to the elbow body,

wherein the clip member comprises an alignment member configured to cooperate with the elbow body to prevent assembly when the flap portion is misaligned with respect to the elbow body

wherein the clip member comprises grip members configured to guide the clip member as the clip member is press-fit onto the elbow body, the grip members projecting away from the elbow body when the clip member is secured to the elbow body,

wherein the clip member is adapted to be flush with the port when secured to the elbow body, and

wherein the clip member is securable to the elbow body in only one orientation.

22. A mask assembly according to claim 21 , wherein the elbow assembly further comprises a flange and a swivel connection at the second end, the swivel connection abutting the flange.

23. A mask assembly according to claim 22 , wherein the clip member and the swivel connection abut the flange on opposite sides of the flange.

24. A mask assembly according to claim 21 , wherein the grip members are configured to be pushed outward by the elbow body as the clip member is press-fit onto the elbow body.

25. A mask assembly according to claim 21 , wherein the port is upstream of the aperture.

26. A mask assembly according to claim 21 , wherein the clip member is configured to be removably secured to the elbow body.

27. An elbow assembly according to claim 21 , wherein the AAV is configured to be removably secured to the clip member.

28. A mask assembly according to claim 21 , wherein the elbow assembly further comprises a flange and a swivel connection at the second end, the swivel connection abutting the flange,

wherein the clip member and the swivel connection abut the flange on opposite sides of the flange,

wherein the grip members are configured to be pushed outward by the elbow body as the clip member is press-fit onto the elbow body,

wherein the port is upstream of the aperture,

wherein the clip member is configured to be removably secured to the elbow body, and

wherein the AAV is configured to be removably secured to the clip member.