| 摘要 |
The closed circuit anesthesia method and device provides for a casing including a separation between a primary side and a secondary side in the form of a volume-displacement detector (1) which preferably is a dry spirometer. Means (13) are provided for detecting the composition and the volume of the respiratory air and connections (19, 20) for supply of required gases. The secondary side is connected to a patient circuit via two branches (8, 9) containing a carbonic acid absorber (10). The output information of the volume-displacement detector (1) is supplied to a control unit (13) for communication with the gas supplies (19, 20). The system comprises an oxygen analyzer (15) and may additionally contain further analyzers (16) for other gas components. The closed anesthesia system of the invention has the advantages of considerably lowering the total consumption of highly cleaned gases like oxygen and narcotics in comparison to open and semi-open systems. Also the narcotic gases stay warmer and more humid and the oxygen consumption as well as the amount of narcotic taken up by the patient can be determined equally allowing a better control of the depth of anesthesia. |
