Externally Coupled Transcutaneous Energy Transmission System for VAD: Measurement of Conducted Emission at the Transmitting Power of 15 Watt

Abstract

This paper reports a conducted interference measured by terminal voltages on an impedance stabilization network connected with a miniaturized externally coupled transcutaneous energy transmission system (ECTETS) for a ventricular assist device. The inverter circuit included in the ECTETS generates electromagnetic interference (EMI). This would cause malfunction to any medical device's as well as the ventricular assist device system itself. In this study, we measured the conducted interference on miniaturized ECTETS based on methods specified by CISPR 11. To reduce the conducted interference, we changed a type of regulator circuit and an EMI filter in the inverter circuit respectively, and this caused the conducted interference on miniaturized ECTETS to be almost below the guidelines of CISPR 11 (Group 2, Class B, Average). However, the interference value does exceed the CISPR 11 guidelines by more than the maximum value of 1.5 dBμV at the frequencies of 3.5−8.4 MHz.