基于基底膜响应的圆窗激振性能评估偏差研究
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中国矿业大学机电工程学院

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Research on evaluation deviation of round-window stimulation based on basilar membrane response
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    摘要:

    目的 研究采用传统基底膜位移评价标准评估圆窗激振式人工中耳听力补偿性能的准确性,为圆窗激振式人工中耳的性能评估提供理论基础。方法 基于耳蜗几何结构的实验数据,建立耳蜗感声微观有限元模型,通过对比内听毛细胞、外听毛细胞、盖膜等部位位移响应的实验测量值,验证了模型的可靠性。基于该模型,对比分析了正向激振、圆窗激振下的基底膜位移与内听毛细胞静纤毛剪切位移;以内听毛细胞静纤毛剪切位移作为感声标准,研究了圆窗激振时采用传统人工中耳基底膜评价标准的等效声压级偏差。结论 在所研究耳蜗微段对应的5 kHz特征频率处,相同幅值的声压作用下,圆窗激振的基底膜位移和内听毛细胞静纤毛剪切位移均小于正向激振的对应值。故正向激振下的内听毛细胞更兴奋,感声效果更强。此外,采用正向激振的基底膜位移评价方法来评估圆窗激振的听力补偿效果,会高估圆窗激振的听力补偿性能;但偏差较小,是一种相对可靠的评价方法。

    Abstract:

    Objective Studying the accuracy of the traditional basilar membrane displacement evaluation criteria for evaluating the hearing compensation performance of the round window-stimulated middle-ear implant, and providing a theoretical basis for the performance evaluation of the round window-stimulated middle-ear implant. Methods an acoustic microscopic finite element model of cochlea was constructed based on experimental data of the geometry of cochlea. The reliability of this model was verified by comparing with experimental measurement values that include inner hair cells displacement, outer hair cells displacement, tectorial membrane displacement, etc. Based on this model, we comparatively analyzed the displacement of basilar membrane and the stereocilia shear displacement of the inner hair cells under forward stimulation and round-window stimulation. Using stereocilia shear displacement of the inner hair cells as the criterion of sense of sound, we studied the equivalent SPL deviation under round-window stimulation when using basilar membrane displacement under forward stimulation as the criterion of sense of sound. Conclusions At 5 kHz characteristic frequency of the studied slice of cochlea, under the sound pressures which have the same amplitude, the displacement of basilar membrane and the stereocilia shear displacement of the inner hair cells under round-window stimulation are lower than that under forward stimulation. Hence, under forward stimulation, the inner hair cells are more excited and the performance of sense of sound is better than that under round-window stimulation. Moreover, using displacement of basilar membrane as the criterion of hearing compensation performance of forward stimulation middle ear implant under round-window stimulation will overestimate hearing compensation performance of middle ear implant that uses round-window stimulation; but the deviation is relatively small; thus, it is a relatively reliable evaluation method.

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  • 收稿日期:2020-09-19
  • 最后修改日期:2020-12-05
  • 录用日期:2020-12-08
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