Patent ID: 8616200

Claim:
In a gas delivery system for supplementing the breathing of a patient, a system comprising a patient interface device, a source of pressurized gas, a conduit for transporting gas from the source to the mouth piece, an exhalation port disposed proximate the mouth piece and in fluid communication with at least one of the mask and the conduit, and an inflatable reservoir in communication with the conduit between the gas source and the exhalation port, the improvement comprising: a one-way check valve positioned in a conduit between said inflatable bag and said exhalation port that creates resistance to gas flow between said inflatable reservoir and said exhalation port that is greater than the resistance associated with filling said inflatable reservoir with gas, said check valve associated with a valve seat that is angled with respect to the longitudinal axis of said conduit between said inflatable bag and said exhalation port.