Voltage property analysis of piezoelectric floating mass actuator used in middle ear implant  

中耳植入式助听装置压电悬浮振子的电压特性分析(英文)

作　　者：刘后广[1] 塔娜[1] 饶柱石[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《Journal of Southeast University(English Edition)》2009年第4期496-500,共5页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No10772121);the Med-Science Cross Research Foundation of Shanghai Jiao-tong University (NoYG2007MS14)

摘　　要：Aiming at a kind of middle ear implant（MEI）, the driving voltage of a piezoelectric floating mass actuator is analyzed using a 0. 7Pb （Mg1/3Nb2/3） O3-0. 3PbTiO3 （ PMN- 30% PT）stack as a new type of vibrator. For the purpose of facilitating the analysis, a simplified coupling model of the ossicular chain and the piezoelectric actuator is constructed. First, a finite element model of a human middle ear is constructed by reverse engineering technology, and the validity of this model is confirmed by comparing the simulated motion of the stapes footplate obtained by this model with experimental measurements. Then the displacement impedance of the incus long process is analyzed, and a single mass-spring-damper equivalent model of the ossicular chain attached with the clamp is derived. Finally, a simplified coupling model of the ossicular chain and the piezoelectric actuator is established and used to analyze the driving voltage property of the actuator. The results show that the required driving voltage decreases with the increase in the frequency, and the maximum required driving voltage is 20. 9 V in the voice frequencies. However, in the mid-high frequencies where most sensorineural hearing loss occurs, the maximum required driving voltage is 3.8 V, which meets the low-voltage and low-power requirements of the MEI.针对一种新型悬浮振子式中耳植入助听装置,分析了其振子的驱动电压特性,该振子由0.7Pb (Mg1/3Nb2/3)O3-0.3PbTiO3(PMN-30%)叠堆实现.为了辅助分析,建立了听骨链与振子的简化耦合力学模型.首先利用逆向成型技术建立了人体中耳有限元模型,其可靠性通过镫骨底板的位移模拟值与实验测得数据对比得以验证;然后利用该中耳有限元模型分析了振子绑定装置处的位移阻抗特性,并基于此建立听骨链与绑定装置的等效力学模型;最后建立了听骨链与压电悬浮振子的耦合力学模型,分析了该振子的驱动电压特性.研究结果表明:振子所需驱动电压随着频率的增大而减小;在语音频段,所需的最大驱动电压为20.9V;在感音神经性听力损伤多发生的中高频段,该驱动电压不高于3.8V,满足中耳植入式助听装置低电压、低能耗的要求.

关 键 词：middle ear implant piezoelectric actuator floating mass driving voltage 

分 类 号：TN384[电子电信—物理电子学]