Finite element analysis of the coupling between ossicular chain and mass loading for evaluation of implantable hearing device
Finite element analysis of the coupling between ossicular chain and mass loading for evaluation of implantable hearing device
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听骨链与质量负载耦合的有限元分析用于评估植入式听力装置
DOI：
10.1016/j.heares.2011.04.012
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发表时间：
2011-10-01
期刊：
影响因子：
2.8
通讯作者：
Shi, Hong
中科院分区：
文献类型：
--
作者：
Wang, Xuelin;Hu, Yujin;Shi, Hong
利用有限元模型分析了植入式中耳助听器中听小骨链与换能器之间的耦合效应。传感器的质量负载以浮动质量传感器（FMT）的形式附着于砧骨的长突上或通过非接触式电磁传感器（CLT）的磁体施加于砧-镫骨关节附近。通过改变传感器的位置、压接方式和压接机构的阻尼参数，从两个方面研究了传感器的理论性能：（1）镫骨踏板处的位移变化，它描述了传感器位置对听力的影响;（2）传感器的等效压力输出，它将传感器驱动的踏板位移与施加到正常耳朵以产生该位移的声压联系起来。对于压接连接不紧密或支撑刚度较低的FMT，在特定频率下，声致镫骨位移出现较大下降，峰值下降约25.8dB。紧密连接或高支撑刚度使镫骨位移的下降向更高频率转移。对于CLT，将25 mg的电磁换能器放置在砧-镫骨关节附近，可使镫骨位移最大减少约16.5 dB。提出了等效声压输出和电磁力要求，以产生与耳道声刺激等效的镫骨位移。在1500 ~ 4000 Hz的频率范围内，通过换能器激励可以恢复质量负荷效应引起的踏板位移下降。有限元分析表明，提高夹和听骨链之间的耦合刚度是非常有帮助的换能器刺激的效率最大化。(c)2011 Elsevier B. V.保留所有权利。
Finite element (FE) model is used to analyze the coupling effects between ossicular chain and transducer of implantable middle-ear hearing devices. The mass loading of the transducer is attached to the long process of the incus in the form of floating mass transducer (FMT) or applied near the incus-stapes joint by a magnet of contactless electromagnetic transducer (CLT). By changing placement of the transducer, crimping connection and damping parameter of the crimping mechanism, theoretical performances of the transducers were investigated on mechanical characteristics in two aspects: (1) displacement change at the stapes footplate, which describes the change in hearing due to placement of the transducer; (2) the equivalent pressure output of the transducer, which relates the footplate displacement driven by transducer to the sound pressure applied to a normal ear to produce that displacement. For the FMT with a less tight crimping connection or low supporting rigidity, a large drop of the sound-induced stapes displacement occurs at a specific frequency, with a peak reduction about 25.8 dB. A tight connection or high supporting rigidity shifts the drop of the stapes displacement to higher frequency. For the CLT, an electromagnetic transducer of 25 mg placed near the incus-stapes joint produces a maximum decrease of the stapes displacement around 16.5 dB. The equivalent sound pressure output and electromagnetic force requirement are proposed to produce the stapes displacement equivalent to that ear canal sound stimulus. The drop of the footplate displacement caused by mass loading effect can be recovered by the transducer stimulation over frequency range from 1500 Hz to 4000 Hz. The FE analysis reveals that enhancing the coupling stiffness between the clip and the ossicular chain is much helpful for maximizing the efficiency of the transducer stimulation. (c) 2011 Elsevier B.V. All rights reserved.