Analysis of electromagnetic compatibility in biological tissue for a novel artificial anal sphincter

The electromagnetic compatibility analysis of biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter (AAS) is discussed. The electromagnetic compatibility in the biological tissue surrounding the transformer was analysed by the finite integration technique method. The specific absorption rate (SAR) and current density as a function of frequency (100 k-1 MHz) for an emission current of 10 A were calculated. A high-resolution realistic human model consisting of 56 kinds of tissues or organs was constructed based on visible human project data set through a semi-automatic image segmentation technique. As a result, the SAR in the vicinity of the transformer is 10 W/kg and sufficiently small, which is divided by the basic restriction of International Commission on Non-Ionising Radiation Protection (ICNIRP). On the other hand, the current density is also far smaller than the ICNIRP s basic restrictions as the frequency rises. The result shows that the analysis of electromagnetic compatibility is very important for developing the transcutaneous transformer for an AAS system.