体导电能量传递电磁场模型的分析与仿真

Analysis and Simulation of Electromagnetic Model for Volume Conduction Energy Delivery

对于植入式电子装置来说,总是希望装置能够长期在体内稳定地工作,所以能量的供给单元是装置的重要部分。首先通过电磁场有限元软件FEMlab3.3建立了体导电能量传递场域数值模型,电磁场数值计算采用最为常用的有限元方法,方法的运用主要获得皮肤的电流密度和电势分布图象,从而可了解皮肤的温度分布,避免因电流密度大而损伤皮肤。为了提高充电电流传递效率,设计了三种不同形状的电极以优化电极皮肤接触阻抗,通过在体外电极上施加不同等级电压以得到最终结果。根据仿真结果,在保证人体安全电流情况下,导电电流传递效率可达20%以上,能量传递效率在4%-9%之间。

It is always hoped that implantable devices can work steadily and longer in human body,so the unit of energy delivery becomes the most important part for implantable devices.In this paper,an energy delivery model of volume conduction was created by FEMlab3.3（Finite Element Model Lab）.Finite element method was used to solve the problem and get the images of current density and electric potential,and then damages of body skin can be prevented without excessive current density.Three different shape electrodes were designed to enhance current transmitting efficiency,and several voltages were used for pursuing perfect goal.Because of ensuring body safety current,the current transmitting efficiency is higher than 20%,and the energy delivery efficiency will be between 4%-9%.It is clear that high energy delivery efficiency can be obtained and the results provide references for further study of energy delivery through volume conduction.