Patent ID: 7617824

Claim:
A ventilator comprising: a housing; a gas flow generator disposed in the housing and adapted to generate a flow of gas; a gas outlet port disposed on an exterior surface of the housing; a first conduit coupling the gas flow generator to the gas outlet port; a gas inlet port disposed on an exterior surface of the housing; a first exhaust valve disposed in the housing; a second conduit coupling the gas inlet port to the first exhaust valve, wherein the first exhaust valve controls a flow of exhaust gas from the second conduit; a second exhaust valve disposed in the housing and operatively coupled to the first conduit, wherein the second exhaust valve controls a first flow of exhaust gas from the first conduit; and a controller operatively coupled to the second exhaust valve, wherein the controller causes the second exhaust valve to change a degree of flow restriction based on a respiratory phase of a patient coupled to the ventilator responsive to the ventilator being configured to operate in a single-limb ventilation configuration.