Mask vent
A vent arrangement is provided to a mask to discharge exhaled gas from the mask to atmosphere. The vent arrangement is structured to diffuse the exhaust vent flow to produce less air jetting, thereby increasing the comfort of the patient and their bed partner. The vent may include a first wall, a second wall defining an outer perimeter, and a plurality of gas washout vent holes positioned between the first wall and the second wall, the vent holes having an inner edge positioned within the outer perimeter of the second wall.
1. A method of manufacturing a mask for use in positive airway pressure treatment of sleep disordered breathing, the mask being configured to receive a supply of air or other breathable gas pressurized above atmospheric pressure to an interior of the mask, the method comprising:
forming a vent in a tool movable along a line of draw, the vent configured to discharge exhaled gas from the interior of the mask to atmosphere during treatment when the interior of the mask receives the supply of air or other breathable gas pressurized above atmospheric pressure,
wherein the vent comprises:
a top wall;
a bottom wall;
a plurality of supports disposed between the top wall and the bottom wall; and
a plurality of vent passageways formed between the plurality of supports configured to allow discharge of exhaled gas from the interior of the mask to atmosphere during treatment when the interior of the mask receives the supply of air or other breathable gas pressurized above atmospheric pressure,
wherein the bottom wall comprises an inner side face leading to the plurality of vent passageways, and
wherein each of the plurality of supports includes an outer side face in contact with the inner side face of the bottom wall; and
shaping the inner side face to be angled inwardly toward a central axis of the vent to permit the line of draw for the tool.
2. The method according to claim 1 , wherein the plurality of vent passageways form a plurality of gas washout vent holes located at an outer perimeter of the top wall.
3. The method according to claim 2 , wherein the plurality of gas washout vent holes are evenly spaced around the outer perimeter of the top wall.
4. The method according to claim 2 , wherein the plurality of gas washout vent holes are spaced in a circular configuration around the outer perimeter of the top wall.
5. The method according to claim 2 , wherein at least one gas washout vent hole is disposed between adjacent ones of the plurality of supports.
6. The method according to claim 1 , wherein the bottom wall further comprises a top face, and further comprising shaping the top face to be angled downwardly moving away from the central axis of the vent.
7. The method according to claim 6 , wherein the top face of the bottom wall has a convex shape.
8. The method according to claim 1 , wherein the top wall includes an outer edge forming an outer perimeter, and wherein the plurality of supports are located inside the outer perimeter of the top wall such that an inner edge of each of the plurality of vent passageways is disposed inside the outer perimeter of the top wall.
9. The method according to claim 1 , wherein the plurality of supports are located beneath the top wall and inside the bottom wall.
10. The method according to claim 1 , wherein each of the plurality of supports includes a top face in contact with a bottom surface of the top wall.
11. The method according to claim 1 , wherein the mask comprises an elbow configured to connect to an air delivery tube to deliver the supply of air or other breathable gas to the interior of the mask, and the vent is provided to the elbow.
12. The method according to claim 1 , wherein the mask comprises a shell or frame and a patient contacting portion configured to form a seal with a patient's face, and the vent is provided to the shell or frame.
13. The method according to claim 1 , wherein the bottom wall forms a circular opening, and the inwardly angled, inner side face extends along an entire perimeter of the circular opening.
14. The method according to claim 1 , wherein the inner side face of the bottom wall is oriented to face radially inwardly towards an interior of the vent and the central axis of the vent, and the outer side face of each of the plurality of supports is oriented to face radially outwardly away from the interior of the vent and the central axis of the vent.
15. A mask for use in positive airway pressure treatment of sleep disordered breathing, the mask being configured to receive a supply of air or other breathable gas pressurized above atmospheric pressure to an interior of the mask, the mask comprising:
a vent configured to discharge exhaled gas from the interior of the mask to atmosphere during treatment when the interior of the mask receives the supply of air or other breathable gas pressurized above atmospheric pressure,
wherein the vent comprises:
a top wall;
a bottom wall;
a plurality of supports disposed between the top wall and the bottom wall; and
a plurality of vent passageways formed between the plurality of supports configured to allow discharge of exhaled gas from the interior of the mask to atmosphere during treatment when the interior of the mask receives the supply of air or other breathable gas pressurized above atmospheric pressure,
wherein the bottom wall comprises an inner side face leading to the plurality of vent passageways,
wherein each of the plurality of supports includes an outer side face in contact with the inner side face of the bottom wall, and
wherein the inner side face is angled inwardly toward a central axis of the vent to permit a line of draw for a manufacturing tool.
16. The mask according to claim 15 , wherein the bottom wall further comprises a top face, and the top face is angled downwardly moving away from the central axis of the vent.
17. The mask according to claim 16 , wherein the top face of the bottom wall has a convex shape.
18. The mask according to claim 15 , wherein the top wall includes an outer edge forming an outer perimeter, and wherein the plurality of supports are located inside the outer perimeter of the top wall such that an inner edge of each of the plurality of vent passageways is disposed inside the outer perimeter of the top wall.
19. The mask according to claim 15 , wherein the plurality of supports are located beneath the top wall and inside the bottom wall.
20. The mask according to claim 15 , wherein each of the plurality of supports includes a top face in contact with a bottom surface of the top wall.
21. The mask according to claim 15 , wherein the bottom wall forms a circular opening, and the inwardly angled, inner side face extends along an entire perimeter of the circular opening.
22. The mask according to claim 15 , wherein the inner side face of the bottom wall is oriented to face radially inwardly towards an interior of the vent and the central axis of the vent, and the outer side face of each of the plurality of supports is oriented to face radially outwardly away from the interior of the vent and the central axis of the vent.