微型诊疗系统无线供能技术及其生物电磁效应研究

Wireless power transmission of microsystem and bioelectromagnetic effects

目的针对人体肠道内微型诊疗系统能量供应问题,研究了一种基于电磁耦合的无线能量传输系统,并对其产生的生物电磁效应进行分析。方法围绕在人体腹部的发射线圈产生的交变磁场,体内微小线圈产生感应电动势为肠内诊疗系统提供电能。为了研究电磁场在人体组织产生的生物效应,本文首先采用图像分割技术对人体横断面图像进行组织识别,建立了包含56种组织的高精度三维真实人体数字化模型,然后通过数值计算的方法研究了能量传输系统的生物电磁效应。结果获得电流密度、比吸收率、磁场强度在人体的分布,以及不同频率下全身平均比吸收率。结论生物电磁效应的研究为无线供能技术在人体肠道诊疗系统的应用奠定了生物安全性基础。

Objective A wireless power transmission system based on inductive coupling was researched for power supplying of microsystem in intestinal tract. The bioelectromagnetic effects produced by the power transmission system were analyzed. Methods A time-varying electromagnetic field was produced by the transmitting coil rounded at abdomen. Inductive voltage provided energy for the in-body microsystem produced by a miniature coil. A high resolution realistic human model,including 56 kinds of tissues,was built in order to investigate the effects on human cased by the electromagnetic field. In this paper these tissues were identified by image segmentation technology. The bioelectromagnetic effects in the human model were calculated via numerical calculation method. Results The distribution of current density,magnetic intensity and specific energy absorption rate （SAR） were obtained. Whole-body average SAR at different frequencies was also achieved. Conclusions This research on bioelectromagnetic effects established a biology safety foundation for the application of this wireless power transmission technology.