| 摘要 |
Ventilator having an inhalation phase and an exhalation phase in its operative cycle for use with a source of gas under pressure. A master sequencing cartridge having an inlet adapted to be connected to a source of gas under pressure and an outlet is provided. The cartridge has a valve member movable between open and closed positions to control the flow of gas from the inlet to the outlet. The cartridge is provided with a diaphragm capable of operating under differentials in pressure for causing movement of said valve member. A breathing circuit outlet is provided and is coupled to the outlet of the master sequencing cartridge. A pneumatic control circuit is provided for controlling the movement of the valve member of the master sequencing cartridge between open and closed positions and includes a volume/rate control valve assembly having an inlet and an outlet. The inlet of the control valve assembly is coupled to the outlet of the master sequencing cartridge and the inlet is coupled to the diaphragm means of the cartridge whereby the timing for moving the valve member between open and closed positions is determined by the rate of flow of gases through the volume/rate control valve assembly. A demand base line compensator is coupled to the breathing circuit outlet and provides demand constant positive airway pressure.
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