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 |
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.
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