The biological channel modelling of implantable medical devices

Implantable medical device is an effective means of modern medical treatment and diagnosis. Its energy and data wireless transmission way become a research hot spot in bio-electronic field. The purpose of this paper is to study the influence of biological channel on the electromagnetic wave transmission characteristics in specific biological environment. In this paper, the biological tissues channel is modeled using Lumerical FDTD Solutions professional software, and in the skin, fat and muscle´s homogeneous biological channel and multilayered biological channel the electromagnetic field intensity´s change with the propagation depth is analyzed. In homogeneous biological channel, the electric field intensity exponentially decays with the propagation depth. With the distance changing from 1mm to 7mm, the electric field intensity in the skin, fat and muscle´s homogeneous biological channel would be attenuated to 29.6%, 44.8% and 31% respectively. However, in multilayered biological channel, since the impedance mismatch at the edge of two adjacent medium, there is the mutation phenomenon at the edge, and the maxim value would happen in the fat layer. The research of the electric field intensity´s change in biological channel in this paper will provide the model reference and theoretical basis for the subsequent study in energy attenuation in wireless data transmission and bit error rate.