Wireless Power Transmission to Implantable Monitoring Devices for Gastroesophageal Reflux Disease

Study on Optimum Number of Coils and Frequency through Analysis

Abstract

　This paper proposes a wireless energy transmission system for implanted devices for monitoring gastroesophageal reflux disease. One of the wireless energy transmission systems is transcutaneous energy transmission system (TETS). We developed a wireless power transmission system that uses a planar-type transmitting coil to send power to a planar-type receiving coil implanted deep inside the body. To obtain higher transmission efficiency, the transmission frequency and number of turns of the receiving and transmitting coils were modified. The relative performance of two methods of wireless power transmission, i.e., series compensated transmitting and receiving (SS method) and series compensated transmitting and parallel compensated receiving (SP method), was analyzed. The calculation result revealed that the maximum transmission efficiency of SP method was 0.8%, when the number of turns of receiving coil was 15 and that of transmitting coil was 22 at 0.9 MHz.