Gas carrying headgear with porous boundary membranes

1. A support assembly for a respiratory interface device comprising: an elongated support member structured to contact a user, the support member having a conduit portion and at least one porous portion, wherein the conduit portion is structured to allow the passage of gas therethrough and adapted to be in fluid communication with a pressure generating system, and wherein the conduit portion is in fluid communication with the porous portion, wherein the porous portion is structured to allow for passage of gas therethrough and for exhaust of gas therefrom to an ambient environment, and wherein the porous portion is structured to be in fluid communication with a mask.

2. The support assembly of claim 1 , wherein the porous portion is structured to have a selected axial flow rate and at least one radial exhaust rate.

3. The support assembly of claim 2 , wherein:

the porous portion is a porous body;

the porous portion includes at least a first section and a second section; the first section having a first radial exhaust rate; and the second section having a second radial exhaust rate.

4. The support assembly of claim 3 , wherein the first section and the second section extend coextensively along the porous portion.

5. The support assembly of claim 4 , wherein: the first section is a tubular conduit having radial openings; the second section is a fabric cover; and the first section is substantially enclosed within the second section.

6. The support assembly of claim 3 , wherein: the first section is a first body; the second section is a second body; and the first body and the second body are in fluid communication and disposed in series.

7. The support assembly of claim 2 , wherein the porous portion is constructed from a material selected from the group including cell foam, woven material, fibrous textile, and a material having micro-passages.

8. The support assembly of claim 2 , wherein the porous portion includes a primary passage assembly structured to provide a conduit for the axial passage of gas.

9. The support assembly of claim 8 , wherein the primary passage assembly is a single passage.

10. The support assembly of claim 9 , wherein the primary passage assembly single passage is generally circular in cross-section and has a first, greater radius at an upstream location and a second, lesser radius at a downstream location.

11. The support assembly of claim 2 , wherein the porous portion includes a reinforcing assembly.

12. The support assembly of claim 11 , wherein the reinforcing assembly includes at least one reinforcing element selected from the group including a rigid member, a stiff member, a shape maintaining member, a tension member, and a partial shell.

13. The support assembly of claim 11 , wherein the reinforcing element is disposed within the support member.

14. The support assembly of claim 11 , wherein the reinforcing element is disposed on the periphery of the support member.

15. The support assembly of claim 2 , wherein: the porous portion includes a tubular conduit having radial openings and a fabric cover; and the tubular conduit is substantially enclosed within the fabric cover.

16. A support assembly for a respiratory interface device, the respiratory interface device including a mask having an opening, the support assembly comprising: an elongated support member structured to contact a user and including a porous portion, wherein the porous portion is structured to allow for axial passage of gas therethrough and radial exhaust of gas therefrom to an ambient environment; and wherein the porous portion being in fluid communication with the mask opening.

17. The support assembly of claim 16 , wherein:

the porous portion is a porous body;

the porous portion is structured to have an axial flow rate and a radial exhaust rate;

the porous portion includes at least a first section and a second section;

the first section having a first radial exhaust rate; and the second section having a second radial exhaust rate.

18. The support assembly of claim 16 , wherein the porous portion is constructed from a material selected from the group including cell foam, woven material, fibrous textile, and a material having micro-passages.

19. The support assembly of claim 16 , wherein the porous portion includes a reinforcing assembly.

20. A method of using a respiratory interface device, the respiratory interface device including a mask having a mask opening therethrough and a pressure generating system structured to generate a flow of gas at an elevated pressure, a support assembly including at least one elongated support member structured to contact a user, the at least one support member having at least one conduit portion and a porous portion, the conduit portion is structured to allow the passage of gas therethrough, the conduit portion being in fluid communication with the pressure generating system and being in fluid communication with the porous portion, the porous portion is structured to allow for axial passage of gas therethrough and radial exhaust of gas therefrom to an ambient environment, and the porous portion being in fluid communication with the mask opening, the method comprising: positioning the mask over at least one of the user's nose or mouth; generating a flow of pressurized gas; communicating the pressurized gas via the support assembly to the mask; and exhausting a portion of the pressurized gas radially through the porous portion.