1. An apparatus was manufactured for artificial respiration with pressed oxygen. In this apparatus, the air breathed out of a tracheal tube was introduced into acan filled with 4 kg of soda-lime, through an expiration tube by the action of a respiration valve, so that carbon dioxide might be removed from the expired air. After that, the air was forced into the lung through an inspiration tube, the respiration valve, and the tracheal tube. In the course of the inspiration tube, oxygen was released, at a rate of 2 to 4 liters per minute, from a respiration bag with a capacity of 60 liters where oxygen was deposited. Pressure was given to the oxygen by pressing the respiration bag adequately with the palms. This apparatus was called the closed-cycle artificial respiration apparatus for large animal, type I.
2. The apparatus of type II had the following points improved.(a) The opening of the respiration valve was widenld. The tracheal tube was made shorter and wider so that its dead space might be reduced (figs. 5, 6, and. 8).(b) The inspiration and expiration tubes were replaced by winding tubes one liter in capacity. The number of connecting tubes was adjusted in accordance with the size of the animal under treatment (fig. 9).(c) A safety valve for the pressure inside the lung was attached to the apparatus to prevent excessive pressure (fig.10).(d) The whole apparatus was so designed as to be separable and portable (fig. 18). A type III of the same apparatus was devised (figs. 3 and 4).
3. An anoxic circuit, a circuit charged with anoxia, one charged with excessive oxygen, and one charged with cumulative carbon dioxide were formed by using the above-mentioned apparatus, and the dynamic phase of the physiology of respiration was studied experimentally.
4. The apparatus of type III displayed a remarkable effect when used in thoracotomy in cattle. The author, however, intends to remodel it to a positive-and-negative-pressure type and attach an ether circuit to the apparatus so that the remodeled device may be used also for general anesthesia and for respiration aid for restoration to life.
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