Patent ID: 9492086
Filing Date: 2016-11-15
CPC Classification: A61B,A61M

Claim Text:
1. A mask for treating a patient suffering from obstructive sleep apnea, the mask adapted to be connected to an air flow generator and constructed to cover at least the nostrils of the patient, the mask comprising: a cavity in fluid connection with the nostrils of the patient; an inlet pressure port constructed to be attached to the air flow generator; the inlet pressure port fluidly connected to the cavity via an inlet pressure one-way valve that is constructed to allow air flow from the air flow generator to the cavity with little resistance and block air flow from the cavity to the air flow generator; the inlet pressure port fluidly connected to an expiration valve, wherein the expiration valve is fluidly connected to the cavity and to the outside of the mask, the expiration valve restricts air flow from the cavity to the outside of the mask, wherein an opening pressure of the expiration valve is variable and dependent on the pressure of air in the inlet pressure port as follows: (1) the opening pressure of the expiration valve increases when the pressure or air in the inlet pressure port increases; and/or (2) the opening pressure of the expiration valve decreases when the pressure or air in the inlet pressure port decreases; and an inspiration one-way valve fluidly connected to the cavity and to the outside of the mask, the inspiration valve is constructed to allow air flow from the outside of the mask into the cavity with little resistance and block air flow from the cavity to the outside of the mask.