US 12,296,099 B2
Gas washout vent for patient interface
Tatt Hoong Chow, Singapore (SG); Muditha Pradeep Dantanarayana, Sydney (AU); Rahul Khera, Sydney (AU); Dimitri Marco Maurer, Gosford (AU); and Min Li Tee, Singapore (SG)
Assigned to ResMed Pty Ltd, Bella Vista (AU)
Filed by ResMed Pty Ltd, Bella Vista (AU)
Filed on Nov. 3, 2023, as Appl. No. 18/386,812.
Application 18/386,812 is a continuation of application No. 17/508,067, filed on Oct. 22, 2021, granted, now 11,844,902.
Application 17/508,067 is a continuation of application No. 16/348,895, granted, now 11,160,944, issued on Nov. 2, 2021, previously published as PCT/AU2017/051231, filed on Nov. 9, 2017.
Claims priority of provisional application 62/420,678, filed on Nov. 11, 2016.
Prior Publication US 2024/0066247 A1, Feb. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 16/00 (2006.01); A61B 5/00 (2006.01); A61M 16/06 (2006.01); A61M 16/08 (2006.01); A61M 16/12 (2006.01); A61M 16/16 (2006.01); A61M 16/20 (2006.01)
CPC A61M 16/0622 (2014.02) [A61B 5/4818 (2013.01); A61M 16/06 (2013.01); A61M 16/0627 (2014.02); A61M 16/0633 (2014.02); A61M 16/0683 (2013.01); A61M 16/0866 (2014.02); A61M 16/0066 (2013.01); A61M 16/009 (2013.01); A61M 16/0875 (2013.01); A61M 16/125 (2014.02); A61M 16/16 (2013.01); A61M 16/20 (2013.01); A61M 2205/42 (2013.01); A61M 2230/42 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A gas washout vent for a patient interface system configured to maintain a therapy pressure in a range of about 4 cmH2O to about 30 cmH2O above ambient air pressure in use, throughout a patient's respiratory cycle, while the patient is sleeping, to ameliorate a respiratory or a sleep disordered breathing condition, the gas washout vent comprising:
a housing comprising a cylindrical wall with one or more passages through the cylindrical wall, the one or more passages being configured to provide fluid communication with a portion of the patient interface system that is configured to be exposed to the therapy pressure,
wherein the one or more passages each include a respective first opening on a first surface of the cylindrical wall, the housing at least partially defining a second opening that is in communication with ambient atmosphere; and
a diffusing material located at least partially within the housing to be adjacent the first surface, a surface of the diffusing material facing the first surface being spaced away from the first surface by a gap that extends to provide fluid communication between all of the first openings, as well as between all of the first openings and the second opening,
wherein the housing is configured so that air is prevented from flowing out of the housing at all areas directly opposite each of the first openings, and
wherein the diffusing material and a material of the cylindrical wall are different materials.