Abstract
The author previously devised an apparatus that displayed a remarkable effect when used inthoracotomy in cattle. The first type of this apparatus used pressed air (1954), the second type pressed oxygen (1955), and the third type a closed circuit system (1955-1962). In the present study, an anesthetic apparatus with a closed circuit system was developed for large animals. It had a fitted artificial respiration unit. The new apparatus had the following points improved.
1. The tracheal tubes were made shorter (to 100 cm) and wider (1.7, 2.5, and 3.2 cm in inside diameter). The resliration tube inlet and outle was a winding one 4.5 cm in inside diameter and 160 cm in length. Two respiration bags 20 and 40 liters in capacity were prepared.
2. The dry flow meter for circuit oxygen was graduated 1-15 liters and 13-30 liters per minute, the vaporizer 100-2, 500 ml per minute, and stickoxydul 1-15 liters per minute.
3. Acooper kettle 350 ml in capacity was used for the maintenance of ether and halothane during the induction of anesthesia. Fluotec (Fluoretter) 135 ml in capacity was uesd for the maintenance of anesthesia with halothane. Halothane concentration was measured by a fluothane-meter.
