悬浮振子对中耳声传播特性影响的数值研究  

NUMERICAL STUDY ON THE EFFECT OF THE FLOATING MASS TRANSDUCER ON MIDDLE EAR SOUND TRANSMISSION

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：《力学学报》2010年第1期109-114,共6页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10772121);上海交通大学医工交叉研究基金(YG2007MS14)资助项目~~

摘　　要：为研究悬浮式中耳植入式助听装置中悬浮振子对中耳声传播特性的一些影响,建立了包括绑定悬浮振子的中耳有限元模型.该模型基于一无任何听力损伤病史的成年志愿者的左耳,利用CT扫描和逆向成型技术建成.模型的可靠性通过鼓膜及镫骨底板的位移计算结果与国外文献实验测得数据进行对比加以验证.研究结果表明：悬浮振子的绑定会显著恶化中耳的高频传输特性;振子输出8.9×10~5N的激振力才能激起100dB声压所对应的激振效果;振子在砧骨长突上的绑定位置离砧镫关节越近,高频段激振效果越好.To overcome some inherent problems in conventional hearing aids,such as low gain at high frequencies,discomfort,and acoustic feedback,floating mass type for middle ear implant system are currently under development.The floating mass transducer（FMT） is the most important component of these devices.For the purpose of investigating the effect of the FMT to middle ear sound transmission,a middle ear finite element model with FMT clamped was constructed.This model was built based on a complete set of computerized tomography section images of a healthy volunteer＇s left ear by reverse engineering technology.The validity of this model was confirmed by comparing the motion of the tympanic membrane and stapes footplate obtained by this model with published experimental measurements on human temporal bones.The result shows that FMT produces mass loading effect prominently at high frequencies,the force required to drive the incus to the equivalent of 100 dB SPL is about 8.9 dynes,and placing the clamp point of the FMT close to the incudostapedial joint enhances the driving effect.

关 键 词：悬浮振子 中耳 有限元建模 逆向工程 听骨链 

分 类 号：R318.01[医药卫生—生物医学工程]