| 摘要 |
A ventilator with an inhalation phase and an exhalation phase in its operative cycle having an inlet adapted to be connected to a supply of gas under pressure and first, second and third outlets. A servo controller is provided having an inlet and an outlet with control valve means movable between open and closed positions to control the flow of gas from the inlet to the outlet. A conduit system is provided for supplying gas from the first outlet to the patient adapter. An exhalation valve assembly is coupled to the patient adapter and is movable between open and closed positions. A conduit system is provided for supplying gas from the second outlet to the exhalation valve assembly to maintain the exhalation valve assembly in a closed position during the time the gas is being supplied from the outlet of the servo controller. A sensing mechanism is provided for sensing the pressure of the gas in the conduit system for supplying gas from the outlet of the servo controller to the patient adapter and for switching the servo controller from an open position to a closed position when a predetermined pressure is reached. A flow acceleration system is provided for augmenting the flow of gases through the first outlet when the pressure in the first outlet is of a certain predetermined pressure. A fail-safe apneustic plateau system is provided. In addition, an expiratory termination circuit is provided for commencing the inspiratory phase with high constant positive pressures existing in the inspiratory breathing circle. |
