US 11,717,637 B2
Breathable gas inlet control device for respiratory treatment apparatus
Philippe Auguste Chalvignac, Moissy Cramayel (FR); Arthur Kin-Wai Yee, Sydney (AU); David Creusot, Sydney (AU); and Enrico Brambilla, Milan (IT)
Assigned to RESMED PARIS SAS
Filed by RESMED PARIS SAS, Moissy-Cramayel (FR)
Filed on May 13, 2022, as Appl. No. 17/743,708.
Application 17/743,708 is a continuation of application No. 16/156,633, filed on Oct. 10, 2018, granted, now 11,351,334.
Application 16/156,633 is a continuation of application No. 15/444,526, filed on Feb. 28, 2017, granted, now 10,335,571, issued on Jul. 2, 2019.
Application 15/444,526 is a continuation of application No. 13/635,935, granted, now 9,616,192, issued on Apr. 11, 2017, previously published as PCT/AU2011/000341, filed on Mar. 25, 2011.
Claims priority of provisional application 61/317,483, filed on Mar. 25, 2010.
Prior Publication US 2022/0265957 A1, Aug. 25, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61M 16/20 (2006.01); A61M 16/00 (2006.01); A61M 16/12 (2006.01)
CPC A61M 16/203 (2014.02) [A61M 16/0051 (2013.01); A61M 16/0066 (2013.01); A61M 16/0069 (2014.02); A61M 16/12 (2013.01); A61M 16/20 (2013.01); A61M 16/201 (2014.02); A61M 16/204 (2014.02); A61M 16/205 (2014.02); A61M 16/206 (2014.02); A61M 16/207 (2014.02); A61M 16/024 (2017.08); A61M 16/202 (2014.02); A61M 2016/0015 (2013.01); A61M 2016/0027 (2013.01); A61M 2202/0208 (2013.01); A61M 2205/3331 (2013.01); A61M 2205/3365 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A respiratory treatment apparatus configured to provide a flow of breathable gas to a patient in successive respiratory cycles, each cycle including an inspiration phase and an expiration phase, comprising:
a gas inlet having a variable aperture that is adjustable between a range of positions from a closed position to a fully open;
a seal activation chamber proximate to the variable aperture;
a gas outlet; and
a flow generator adapted to provide a supply of pressurized breathable gas from the gas inlet and to the gas outlet; and
a controller to control a level of pressure generated by the flow generator,
wherein during the expiration phase, the controller sets a pressure condition of the seal activation chamber to close the variable aperture of the gas inlet, whereby stopping of inlet flow slows inertia of an impeller of the flow generator to brake the impeller.