2023 Volume 31 Issue 2 Pages 297-304
A transcutaneous energy transmission system (TETS) that wirelessly transmits power to a ventricular assist device using electromagnetic induction is sometimes used along with stent graft therapy. However, the electromagnetic field distribution for a stent graft located near the energy transmission coil is unknown. Therefore, in this study, we created a model of the human body, in which a stent and a transcutaneous transformer were simultaneously embedded, for electromagnetic field analysis and numerically calculated the energy transmission efficiency (η), internal electric field, and specific absorption rate (SAR) for transmitting power of 15 W. We observed a 1.7×10-4 % decrease in η compared to the model without the stent graft insertion. However the SAR of human tissue near the transcutaneous transformer with the highest magnetic field strength remained almost the same. The maximum SAR value for the aortic arch was 1.34 W/kg, which conformed to the guideline value for occupational exposure (10 W/kg) prescribed by the International Commission on Non-lonizing Radiation Protection (ICNIRP).
