全植入式耳蜗传感器纤毛结构优化的有限元仿真

Design of piezoelectric biomimetic cochlear ciliary receptors based on MEMS technology

目前人工耳蜗需麦克风+专用电路来实现频率分选的功能,这使得设备的体积和功耗均较大,通过MEMS技术可以将器件小型化,而仿生学中人耳的纤毛细胞与鱼类侧线纤毛细胞结构类似,且哺乳动物的听觉系统具有丰富的特征,这些关键特征包括频率分选性、低水平刺激的非线性放大以及压缩,该特征使得哺乳动物的耳能够在更大的声压级上进行感应。在此基础上,依据鱼类侧线纤毛细胞以及人耳侧线纤毛细胞的特异性结构,设计了两种仿真模型。通过对比分析,进一步探究了纤毛结构对传感器整体性能的影响,发现椭圆柱纤毛结构对比圆柱形纤毛结构在模态频率分布上有梯度均匀、差值明显的优势,这使得单个传感器测量多通道信号成为可能,能够减少人工耳蜗纤毛传感器单元阵列覆盖测量带宽的数量。

Currently cochlear need microphone+dedicated circuit to realize the function of the frequency separation,this makes the equipment volume and power consumption are larger,by MEMS technology can be device miniaturization,and bionics ciliated cells of human ears and fish ciliated cell structure similar to auditory system has rich characteristics of mammals,these key features include frequency separation properties,low level on the nonlinear amplification and compression,this makes the ear of the mammals can induction in greater sound pressure level,on this basis,according to the fish ciliated cells and human ear side the specificity of the ciliated cell structure,designed the two kinds of simulation model,through comparative analysis,further explore the cilia structure influence on sensor performance,found that the elliptic cylinder cilia cylindrical structure contrast cilia on the modal frequency difference with uniform gradient,difference obvious characteristics,which makes a single sensor unit measuring multi-channel signals possible,reduces the number of measurement bandwidth covered by the array of ciliated sensor units.