人工耳蜗鼓阶内极阵电阻抗的研究  

Impedance of cochlear implant electrode array in scalae tympani

作　　者：杜强[1] 王正敏[1] 

机构地区：[1]复旦大学附属眼耳鼻喉科医院耳鼻咽喉科,上海200031

出　　处：《中华医学杂志》2008年第46期3302-3304,共3页National Medical Journal of China

摘　　要：目的研究REZ-1人工耳蜗电极对阻抗与电极对在鼓阶中位置和刺激频率的关系。方法6例新鲜颞骨标本植入REZ-1人工耳蜗电极后，采用交流信号源，串联一个1kQ的标准电阻，分别测量标准电阻和电路中总的电压，从而计算出电极之间的阻抗。分别测量电极顶端到尾端相邻电极环、相隔一个电极环之间的阻抗，刺激频率分别采用2、10、100Hz和1、10kHz进行测试。结果相邻电极对的阻抗从顶回到底回不断减小（线性回归，F=198．97，P〈0．01）。相隔电极对的阻抗从顶回到底回不断减小（线性回归，F=126．35，P〈0．01）。电极对阻抗随着刺激频率的增大而减小。结论相邻电极对的阻抗和相隔电极对的阻抗从顶回到底回减小。刺激频率增大时阻抗减小。Objective To study the relationship between the impedance of paired cochlear implant electrodes and their position in scalae tympani as well as the relationship between the impedance and the current frequency. Methods REZ-1 electrodes were implanted in 6 fresh human adult temporal bone specimens. Alternating electrical source was used. A 1 Kohm resistance was in series with the paired electrodes. The voltages of the resistance and the sum voltages of both the paired electrodes and the resistance were recorded. Thus, the impedances of paired electrodes could be calculated. The impedances of neighboring paired electrodes and paired electrodes separated by one electrode were calculated. The frequencies of signals were 2 Hz, 10 Hz, 100 Hz, 1 KHz, and 10 KHz respectively. Results The impedances of neighboring electrodes increased, as the electrodes were closer to the apical turn of the cochlea （liner regression, F = 198.97, P 〈 0.001 ）. The impedances of paired electrodes separated by one electrode increased, as the electrodes were closer to the apical turn of the cochlea （ liner regression, F = 126. 35, P 〈 0. 001 ）. The impedance decreased when the frequency increased. Conclusions The impedances of neighboring electrodes increase, as the electrodes are closer to the apical turn of the cochlea. The impedances of neighboring paired electrodes increase, as they are closer to the apical turn in the scalae tympani. The impedances of paired electrodes that are separated by one electrode increase, as they are closer to the apical turn in the scalae tympani. The impedance decreases when the frequency increases.

关 键 词：人工耳蜗 颞骨 电极 阻抗 

分 类 号：R686[医药卫生—骨科学]