Transducer Type and Design Influence on the Hearing Loss Compensation Behaviour of the Electromagnetic Middle Ear Implant in a Finite Element Analysis
Transducer Type and Design Influence on the Hearing Loss Compensation Behaviour of the Electromagnetic Middle Ear Implant in a Finite Element Analysis
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有限元分析中换能器类型和设计对电磁中耳植入物听力损失补偿行为的影响
DOI：
10.1155/2014/867108
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发表时间：
2014-01-01
影响因子：
2.1
通讯作者：
Huang, Xinsheng
中科院分区：
文献类型：
--
作者：
Liu, Houguang;Ge, Shirong;Huang, Xinsheng
已经开发出几种用于中耳植入物 (MEI) 的电磁换能器，作为传统助听器的替代品，用于感音神经性听力损失的康复。电磁换能器的类型和设计被认为对其听力补偿性能有重大影响。为了研究这些影响，基于一整套人耳微计算机断层扫描切片图像构建了中耳计算模型。通过将模型预测的运动与已发表的实验测量结果进行比较，证实了其有效性。结果表明，当换能器质量较小时，鼓膜驱动换能器（EDT）的听力补偿优于浮动质量换能器（FMT），而当换能器质量较大时，其听力补偿效果较差。砧骨驱动换能器 (IBDT) 是听力补偿最无效的换能器类型。此外，EDT 和 FMT 的质量主要在较高频率下降低换能器性能：换能器质量越大，由这些换能器激发的镫骨位移越低。另一方面，IBDT驱动杆刚度严重降低了换能器在低频时的性能，并且其对换能器性能的不利影响随着IBDT驱动杆刚度的降低而增加。
Several types of electromagnetic transducer for the middle ear implants (MEIs) have been developed as an alternative to conventional hearing aids for the rehabilitation of sensorineural hearing loss. Electromagnetic transducer type and design are thought to have a significant influence on their hearing compensation performance. To investigate these effects, a middle ear computational model was constructed based on a complete set of microcomputerized tomography section images of a human ear. Its validity was confirmed by comparing the model predicted motions with published experimental measurements. The result shows that the eardrum driving transducer (EDT) is superior to the floating mass transducer (FMT) in hearing compensation when the transducer mass is small but inferior to the FMT when the mass gets bigger. The incus body driving transducer (IBDT) is the most ineffective type of transducer for hearing compensation. Moreover, the masses of the EDT and the FMT decrease the transducer performance mainly at higher frequencies: the greater the transducer mass, the lower the displacement of the stapes excited by these transducers. On the other hand, the IBDT driving rod stiffness decreases transducer's performance severely at low frequencies and its adverse effect on transducer performance increases with the decrease of the stiffness of the IBDT driving rod.