医用针状电极电流场边界元计算方法及纯水实验研究

根据医用针状电极系上的电势，利用边界元积分方程建立以针状电极单位长度流入导电介质中的电流为未知量的离散方程，通过求解线性方程组计算针状电极上电流密度的不均匀分布。再由针状电极上的电流密度计算了导电介质中任意一点的场，实现针状电极电流场分布的数值计算。为检验方法的可靠性和准确度，通过实验测量纯水中两针状电极的电势分布，测量值与计算结果相吻合，表明边界元积分方程法能够较好地模拟针状电极的电流场，该方法可用于针状电极电流场分布的数值计算。

Applying Boundary Element to Compute the Potential Distribution of Direct Current of Needle Electrode Array in Conductive Media

According to the electric potential of needle electrode array, discrete equations based on the unknown linear current density were established by using boundary element integral equations. The nonuniform distribution of the current flowing from needle electrode array to conductive media was calculated by solving a linear equation group. Then, the potential distributions at any point were calculated. By boundary element method the numerical calculation of the potential distribution of needle electrode array was realized in conductive media. In order to validate the feasibility of computing method and reliability of computing results, the potential distribution of two needle electrodes was measured in water. The experimental results are in excellent agreement with that of calculation by this method, which indicates that the boundary element method is much fitter to simulate the field of the needle electrodes, can be used to calculate the field distributions of needle electrodes.