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Signal transmission for implantable medical devices using figure-of-eight coils

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4 Author(s)
Matsuki, H. ; Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan ; Ofuji, K. ; Chubachi, N. ; Nitta, S.

A new skin-transparent signal transmission method is proposed. For applications on high energy-consumption medical devices such as total artificial hearts or implantable FES (functional electrical stimulation) systems, we constructed a transcutaneous signal transmission system using figure-of-eight coils, as it is apparent that these applications need feedback and/or controlling signals for stable and safe operation. By employing figure-of-eight coils, we could reduce noise coming from around the coil and still suppress noise emitted from the transmitting coil. In the animal experiment using a goat, we could successfully observe the fluctuation in the amount of the transmitted energy through skin with figure-of-eight coils of 30 mm in diameter. Meanwhile, figure-of-eight coils didn't cause any unfavorable interferences with the electromagnetically driven ventricular assist device connected to the goat's heart at the time

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Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )