Respiratory masks with gusseted cushions

1. A respiratory mask assembly for treatment of sleep disordered breathing, the respiratory mask assembly comprising:

a shell; and

a cushion provided the shell,

wherein the shell is relatively harder than the cushion,

wherein the shell and the cushion form a cavity pressurizable to a therapeutic pressure,

wherein the cushion includes:

a face contacting portion including an upper face contacting region adapted to form a seal along a region of a patient's nose and a lower face contacting region adapted to form a seal along a region of a patient's mouth,

a non-face contacting portion supported by the shell,

a gusset portion provided to at least a section of the cushion between the face contacting portion and the non-face contacting portion, the gusset portion providing a decoupling joint between the face contacting portion and the shell,

wherein, when seen in cross-section:

the gusset portion includes a hanging portion that hangs over an adjacent exterior surface of the cushion, and

the gusset portion includes a first end adjacent to the face contacting portion and a second end adjacent to the non-face contacting portion, and the first end is offset radially outwardly from the second end,

wherein the gusset portion includes only a single gusset,

wherein the single gusset includes a first gusset wall that joins the face contacting portion at the first end, a second gusset wall that joins the non-face contacting portion at the second end, and a tip section that interconnects the first gusset wall and the second gusset wall,

wherein the tip section is positioned radially outwardly with respect to the non-face contacting portion,

wherein the tip section is offset radially outwardly from the first end and the second end, and

wherein a radial offset between the tip section and first end is greater than a radial offset between the first end and the second end.

2. The respiratory mask assembly according to claim 1 , further comprising a reinforcing member providing reinforcement to one or more side walls of the cushion towards the face contacting portion.

3. The respiratory mask assembly according to claim 2 , wherein the reinforcing member is provided at the upper face contacting region.

4. The respiratory mask assembly according to claim 2 , wherein the reinforcing member is arranged between the single gusset and the face contacting portion.

5. The respiratory mask assembly according to claim 1 , wherein the gusset portion is provided at the upper face contacting region.

6. The respiratory mask assembly according to claim 1 , wherein the face contacting portion includes a side wall and a membrane extending from the side wall.

7. The respiratory mask assembly according to claim 1 , wherein the gusset portion includes an outer wall configured to fold over and outside of an inner wall of the gusset portion when the face contacting and non-face contacting portions are compressed towards one another.

8. The respiratory mask assembly according to claim 1 , wherein a thickness of the gusset portion is thinner in cross-section than a thickness of the non-face contacting portion.

9. The respiratory mask assembly according to claim 1 , wherein the gusset portion is configured and arranged to protrude laterally outwardly with respect to the non-face contacting portion.

10. The respiratory mask assembly according to claim 1 , wherein the first end is further from a center of the cushion than the second end.

11. The respiratory mask assembly according to claim 1 , wherein an apex of the tip section is positioned radially outwardly with respect to the non-face contacting portion.

12. The respiratory mask assembly according to claim 1 , wherein the shell includes a plurality of vents.

13. The respiratory mask assembly according to claim 1 , wherein the gusset portion includes a thickness in cross-section that is substantially uniform along its entire length.

14. The respiratory mask assembly according to claim 1 , further comprising a headgear assembly.