Study on the Specific Absorption Rate of Implantable Medical Devices in Multilayer Tissues

Abstract

The exposure of the human body to electromagnetic radiation levels is exacerbated when medical devices are implanted. With the wide application of implantable medical devices, the electromagnetic radiation safety of such devices cannot be ignored. This paper studies the effect of tissue type, implantation depth, frequency and deflection angle on the specific absorption rate of human tissue in vivo with the radiation source. This study takes the multi-layer tissue model as the main research object, and uses CST Microwave Studio to establish a radiation model with a planar inverted-F antenna implanted in human tissue as the radiation source. Calculate the specific absorption rate under various conditions, and judge the influence of various factors on the specific absorption rate. The results show that tissue type and frequency have significant effects on the specific absorption rate. When the frequency is increased from 2.45GHz to 5.8GHz, the specific absorption rate is also increased from 58.2111W/kg to 118.095W/kg. Different tissue types have different specific absorption rates due to differences in relative permittivity and electrical conductivity. However, the effect of implant depth and deflection angle on the specific absorption rate is not obvious.