Basic evaluation of signal transmission coil in transcutaneous magnetic telemetry system for artificial heart

The energy source of implantable artificial heart is located outside the body. A signal system is important in observing and controlling the movement of the implanted equipment. In this case, a transcutaneous power and signal transmission system is useful. This is a noncontact method where magnetic coupling of two coils arranged inside and outside the body is used. In the signal system, it is necessary to cancel the interlinkage magnetic flux of the power transmission system. In this study, the signal transmission coil called eight-figure coil has been designed wherein loop coil and cross coil were combined. These coils cancel the interlinkage magnetic flux according to the shape of coil. As a result, a magnetic field for power transmission is canceled. Results show that in the eight-figure coil, it is necessary to have a lower communication frequency than the self-resonance frequency, and when we transmit the signal in the frequency over the self-resonance frequency of the eight-figure coil, it is necessary to use another eight-figure coil with larger self-resonance frequency. Therefore, an appropriate signal transmission frequency band could be shown.