人工心臓用空心型経皮エネルギー伝送システム

―体外情報による出力電圧の安定化制御―

抄録

In this paper, we propose new control techniques to stabilize the drive voltage (output voltage) of a total artificial heart (TAH). To supply the electric power for driving a TAH, one of the methods is a transcutaneous energy transmission system (TETS) with air-core coils. It is possible to transfer energy by means of electromagnetic induction between two air-core coils placed face-to-face on each side of the skin. With such a design, however, the output voltage fluctuates due to the change in the value of mutual inductance between the two coils when the relative positions between two coils are changed. In order to stabilize the driving voltage of an artificial heart, it is necessary to control the output voltage using a feedback loop. Considering the problems of infectious disease and quality of life (QOL), it is desirable that the output voltage is controlled without a feedback cable. This paper reports on new control techniques that control the output voltage using a primary coil current that can be measured outside the body. As a result, we found that the efficiency of the transcutaneous transformer is more than 90% between the frequencies of 500-800 kHz, and the fluctuation of the output voltage, when the coils were shifted parallel to each other and the gap between the coils were varied, can be controlled to within 2.2 V (without control : 19.4 V).