Patent ID: 6591835
Filing Date: 2003-07-15
Classification: A61M

Abstract:
A pneumatically controlled medical ventilator apparatus comprising:a patient air supply output coupler that is configured to be coupled to a patient airway breathing interface; a breathing gas input port to which a pressurized supply of breathing gas is coupled; a tidal breathing gas supply unit coupled to said breathing gas input port, and being operative to periodically supply a controllable concentration of regulated volume tidal breathing gas for application to said patient airway breathing interface; and a continuous positive airway pressure (CPAP) valve including a valve input port and a patient demand monitoring port, the valve input port being coupled to the breathing gas input port, and said CPAP valve being operative to supply regulated pressure breathing gas to said patient air supply output coupler, in response to a patient initiating a breath; said patient air supply output coupler including a venturi unit and an on-demand breath monitoring port connected to the patient demand monitoring port of said CPAP valve, the venturi unit also being coupled to a source of ambient air, and being operative to supply said regulated pressure breathing gas as a mixture of ambient air and said pressurized breathing gas.