Prototype of Full-duplex communication for Implantable Signal Transmission System Utilizing Noise reduction Effect of Magnetic eight-figure coil

The energy source of implantable artificial heart is located outside the body. Transcutaneous system of power transmission unified with signal transmission is useful in order to observe and control the movement of the implant and power transmission. The system achieves contactless transmission by a magnetic coupling of two coils arranged outside and inside the body. A signal transmission coil is set inside a power transmission coil. In the signal transmission system, it is necessary to cancel the interlinkage magnetic flux caused by the power transmission system. We previously designed transmission coil, called eight-figure coil, combined-foop coil, and cross coil. The geometry of the coil enabled to cancel the interlinkage magnetic flux, which improved signal transmission. We introduced two sets of eight-figure coils; one was used as signal transmission for control implants from the external, and another for observation on the operation of the equipment-using signal from the internal coil. The coil for control was disposed shifting 90 degrees from the coil for observation either in the inside and the outside of the body. Thus the system is expected to realize full-duplex communication. And we examined the ability of communication.