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A transcutaneous energy transmission system (TETS) was composed of a couple of coils, which formed a transformer across the skin, a driving circuit, and a rectifying circuit. By using coreless coils and a high driving frequency (100–160 kHz), more than 25 W of electric power could be transmitted with 78.5% of maximum efficiency (dc to dc). In animal experiments, the primary coil temperature during operation was under 39°C on thermograms. After 10 months of implantation of a secondary coil coated with epoxy resin, it was wrapped by a thin capsule of connecting tissue. No obvious tissue reaction was recognized.

It is desirable to use the adult goat as an experimental animal for the TAH with an implantable pneumatic driven blood pump since the calf has the problem of growth during the study period. Adult animals are also much more similar to adult human patients in physiological terms than immature animals such as the calf. However, it has not yet been possible to design a blood pump that fits well into the narrow space of the goat chest cavity. To solve this problem, a new design of the blood pump fitted to the goat chest cavity was investigated in this study. A bullet-shaped blood pump, which has two sack-type ventricles, was designed and fabricated together with a low-profile atrial cuff. The pump fitted well into goats weighing 47–67 kg and easily produced normal pump output. The results show the promise of future success in obtaining long survival with goats using this blood pump.