中文摘要：

采用有限元法研究用于视神经视觉假体铂铱合金微电极阵列的电场分布情况,在单极和双极电流刺激条件下,分析不同长度微电极的空间电场分布,通过在体动物实验验证了铂铱合金微电极阵列在体工作的有效性.结果表明,经过100μA的单极和双极电流刺激后,铂铱合金电极的最大电场强度均发生在电极材料和绝缘材料的交界处.以电场强度最大点为原点,单极和双极电流刺激的有效半径分别约为21和24μm.

英文摘要：

Finite element method was employed to simulate the electric field distributions of a Pt/Ir microelectrode array for optic-nerve visual prosthesis.Spatial electric field distributions of microelectrodes with different lengths were analyzed under monopolar and bipolar micro-current excitements.The effectiveness of the Pt/Ir microelectrode array was validated by an experiment on animals. According to the simulation results,when under a 100 μA current stimulation monopolarly and bipolarly,the maximum points of the electric density all locate at the interface of the Pt/Ir material and the insulation.And as the maximum （electric） field point being the center,the radius of the effective space under monopolar and bipolar stimulations is approximately 21 and 24 μm,respectively.