超音波モータを用いた直接駆動型人工心臓システムの検討

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In this paper, in order to improve energy transmission efficiency and minimize the size and complexity of the system, we propose a direct-drive system for an artificial heart using an ultrasonic motor for the artificial heart actuator. To supply energy for a total artificial heart (TAH), a transcutaneous energy transmission system (TETS) is one of the most attractive methods. It transmits energy through the skin without wires, using electromagnetic induction between two coils placed on either side of the skin. It is desirable for the energy transmission efficiency to be high and that internal circuitry is miniaturized. In a typical conventional method, the internal circuit consists of an actuator driver circuit, a rectifier and a smoothing circuit, due to the need to drive the artificial heart with DC power. Therefore, it is undesirable for the heat generation of the internal circuit to be excessively high and the physical volume of the internal circuit to be too large. With the proposed method, using an ultrasonic motor driven by AC power, the internal circuit can be eliminated and the AC power transmitted through the body input directly to the motor. First, we designed and tested an externally coupled transcutaneous transformer (ECTT) for an ultrasonic motor. Second, energy transmission efficiency and temperature increases in various parts of the TETS were measured, and the flow rate was estimated. As a result, a maximum energy transmission efficiency of 97% from the input of the transcutaneous transformer to the input of the artificial heart actuator was obtained. The volume of the internal circuit was also reduced by 75%. The temperature increase of the internal circuit was reduced by 90% compared to that of a conventional TETS. It was also confirmed that this proposed system has enough power to drive a TAH.
社団法人日本生体医工学会の論文
2005-12-10

超音波モータを用いた直接駆動型人工心臓システムの検討

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