中文摘要：

目的：构建视神经视觉假体反馈系统，寻求在体测量刺激电极-视神经联合阻抗的方法。使之作为在体情况下评估刺激电极状态的依据。方法：分析电极-视神经的阻抗模型，利用刺激器的双向脉冲刺激电流作为电极-视神经阻抗的载体，采用三电极阻抗测量法对电极-视神经的阻抗进行在体测量。结果：在误差允许的范围内．本试验构建的反馈系统能够在视神经视觉假体刺激的同时，测量出刺激电极间的电极-视神经阻抗。结论：在不改变测量信号发生器的情况下，可以利用微电流刺激器产生的刺激电流作为阻抗的测量信号，此种方法既不增加假体装置的规模．又能取得较精确的测量结果。

英文摘要：

Objective： To constitute a feedback system for optic nerve prosthesis and choose a method to measure the electrode-optic nerve impedance, which could be used to evaluate the condition of stimulation electrodes. Methods： This paper describes an electrode-optic nerve impedance model firstly, and then adopts three-electrode measurement method to measure the electrode-optic nerve impedance with stimulation current as measurement current. Results： Experimental results show that in the range of allowable error, the method is available in electrode-optic nerve impedance measurement. Conclusion： Electrode-optic nerve impedance could be achieved precisely by micro-stimulator without additional signal synthesizer.