Yasushi Takemura
Professor, Yokohama National University, Japan
Title: Wireless power transmission to medically implantable device using magnetic wire
Biography
Biography: Yasushi Takemura
Abstract
Wireless power transmission to a medically implantable device deeply located in the human body is essential to develop future therapeutic and diagnosis technology. We present a power receiving module of 20 mW using a thin magnetic wire of 0. 25 mm diameter.
A magnetization reversal in magnetic wires with bistable magnetization states induces pulse voltage in a pick-up coil which has been known as Wiegand effect [1]. A twisted FeCoV wire is one of the optimum material yielding this effect. A Fe0.4Co0.5V0.1 wire of 11 nm length was used as the core material in the pick-up coil. An alternating magnetic applied field of 4.8 kA/m at 10 kHz was applied to the wire. The induced votage to the pick-up coil was measured, and the power obtained from this voltage as power source was evaluated [2, 3].
We achieve the wireless power transmission of 20 mW to a medically implantable device under the excitation field condition which can be realized by a body-sized excitation coil with practical power supply. The experimental details and other possible applications [4, 5] including battery-less modules are also discussed in the presentation.