抄録
Two types of fluid amplifier with a moving part were devised. One of them is a T-shaped pipe into which an elastic sack is inserted. The flow through the pipe is controlled by the pressure within the elastic sack. This element has a close resemblance in its character to an electronic triode or a transistor; so that the element is used as a general circuit element in fluid system. Another amplifier has a diaphragm and -a tube through which controlled fluid flows. The tube contacts with or is closely adjacent to the diaphragm. The diaphragm is moved by controlling pressure and thus the flow is controlled. This element has an avalanche characteristic like a thyratron or an SCR. Both elements described above may be constructed in a miniature size. They have a very high input impedance (to the direct current, this is infinitive), and work under a low supply pressure.
The present fluid elements are convenient for biomedical purpose because the elements may be directly connected with biological system and controlled fluid does not escape out of the elements. The blood pressure was artificially controlled by means of the fluid element used as an amplifying element. These elements may be applied widely to biomedical uses such as in artificial heart and artificial respirator.
