Evaluation of HighFrequency Leakage Current from AirCore Transcutaneous Energy Transmission System by Comparison of Circuit Measurements and Simulations Usage of the aircore transcutaneous energy transmission system (TETS) is a method that shows great potential with respect to the supply of energy to ventricular assist devices. The TETS is composed of two coils of the transformer with spirally wound conductive wires; the primary (external) coil is fitted outside the body and the secondary (internal) coil is embedded in the subcutaneous tissue of a patient. Here, it should be noted that highfrequency leakage current (HFLC) from the TETS can flow between the primary and secondary coils into the ground because of the capacitive coupling of the coils and human tissue, and we developed aircore coils and covered them with an insulation cloth made of cotton and polyethylene terephthalate sheets in this study. We analyzed the HFLC of a TETS using a circuit simulator and designed a circuit model of a TETS using SIMetrix SPICE, we created a circuit model of TETS consisting of a regulated DC power supply, inverter circuit, Highfrequency isolation transformer, transcutaneous transformer, rectifier circuit, and load resistance. The parasitic capacitance was based on the datasheet of MOSFET which was used in actual measurement. The respective circuit parameter (e.g. inductance of the primary and the secondary coil) was used as the measurement value of LCR meter at the transmitting frequency of 207 kHz, the HFLC was analyzed using transmitting powers of 10xe2x80x9330 W. The results showed that the simulated value of the HFLC was 3.40 mA, and the measured value was 3.93 xc2xb10.32 mA at 15 W of output power. These results are seen to be in good agreement.

Design and validation of a sixantenna WPT system with tracking capabilites for biomedical devices Reliable powering of implantable medical devices is a key requirement for the development of eversosmall sensors and actuators. The difficulty of this task becomes even greater when the device is meant to travel inside the human body. This paper presents a 2 GHz RF WPT system capable of tracking an implantable device and maximizing the amount of power transferred to it along its path. Measurements and simulations were performed to validate the system, and the use of tracking increased the amount of available power for the implant along its path in all the studied points comparatively to the scenario where no tracking was used. This technology presents itself as a promising stepping stone towards batteryless implantable medical devices.