Lim Yoon Seob, Park Se-Ik, Kim Yong Hyup, Oh Seung Ha, Kim Sung June
School of Electrical Engineering, Nano Bioelectronics, Systems Research Center, Seoul National University, Seoul 151-744, Korea.
Med Eng Phys. 2005 Oct;27(8):695-703. doi: 10.1016/j.medengphy.2004.12.009. Epub 2005 Apr 18.
Three-dimensional (3D) finite element analysis is used in this study to model the mechanical effects of the electrode in a cochlear implant. We employ six electrodes with different stiffness produced by different arrangements of metal wires. Different wire arrangements are generated by changing the fitness function of a genetic program. The human cochlea is modeled by the spiral-approximation method. Reconstructed three-dimensional CT images are used to model the real insertion condition. The contact pressure at the tip and the insertion force are found to be highest when the wires are stacked horizontally. Axial rotation of the electrode has minimal effect on the stimulating current spread. The electrode does not contact the basilar membrane. The results indicate that considering the electrode stiffness is important to minimizing mechanical trauma in cochlear implantation.
本研究采用三维（3D）有限元分析来模拟人工耳蜗中电极的力学效应。我们使用由不同金属丝排列产生的六种具有不同刚度的电极。通过改变遗传程序的适应度函数来生成不同的金属丝排列。采用螺旋近似法对人耳蜗进行建模。利用重建的三维CT图像来模拟实际插入情况。发现当金属丝水平堆叠时，电极尖端的接触压力和插入力最高。电极的轴向旋转对刺激电流扩散的影响最小。电极不接触基底膜。结果表明，考虑电极刚度对于将人工耳蜗植入中的机械创伤降至最低很重要。
