| abstract |
A respirator 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 and second outlets. n A device is provided for establishing a positive pressure above atmospheric against which the patient must exhale during the exhalation phase for a predetermined period near the end of the exhalation phase. A device is provided for terminating the application of positive pressure so that the patient is exposed to ambient atmospheric pressure prior to initiation of the inhalation phase. Inspiratory flow acceleration means is provided for supplying additional gases to the first outlet during the inhalation phase. A control device is provided for establishing the length of the inhalation phase and includes an auxiliary reservoir for collecting gas and means for bleeding off the gas from the auxiliary reservoir whereby the exhalation time can be adjusted without being adversely affected by the pressure of the inlet gas. A volume limiting device is provided so that when desired a precise volume of gas can be delivered to the patient. A device is provided for supplying an anesthesia gas in the gases supplied to the inlet so that the respirator can be utilized as an anesthesia unit. |