Design of a Closed Loop Wireless Power Transfer System for an Electrocorticography Device to Be Implanted in the Brain of a Rat Over an Extended Period

摘要

A biomedical power and communications system is currently under development for the purpose of continuously monitoring neural activity in rats with epilepsy over a period of nine months. A closed loop system is employed that dynamically adjusts for optimal performance across a variety of conditions, such as motion of the rat in its environment. The system is designed to deliver 250 mW to the implant wirelessly at 13.56 MHz power carrier over distances ranging from 1 cm to 25 cm. The total system efficiency is theorized to be at least 15%, which is consistent with current state of the art. The analysis and design of such a biomedically implantable system is discussed in detail and specific components are chosen such that a prototype may be constructed in future work.