IEEE Trans Biomed Eng. 2020 Nov;67(11):3253-3261. doi: 10.1109/TBME.2020.2981863. Epub 2020 Mar 19.
The effects of cochlear implants on residual hearing loss is investigated through a finite element model of human auditory periphery consisting of the cochlea and middle ear. The simulation results show that a round window stiffness is the dominant factor in residual hearing loss. The increased round window stiffness to five times caused over 4 dB residual hearing loss at low frequencies below 500 Hz. Without considering round window ossification, inserting a cochlear implant can show at most 4 dB difference of residual hearing loss in magnitude from the no-implant case although the cochlear implant's geometry and position has been varied. If the stiffness of the round window is the same, the simulation results suggest to use a thin-straight-cochlear implant inserted into the lateral side in order to preserve residual hearing at frequencies below 700 Hz. In addition, when the distance between the basilar membrane and a cochlear implant is closer, the residual hearing loss becomes severe at high frequencies above 1 kHz. The results would be helpful for choice of a cochlear implant depending on a patient's condition.
通过包含耳蜗和中耳的人耳听觉外围的有限元模型研究了人工耳蜗植入物对残余听力损失的影响。模拟结果表明，圆窗劲度是残余听力损失的主要因素。圆窗劲度增加到五倍会导致 500Hz 以下低频超过 4dB 的残余听力损失。如果不考虑圆窗骨化，即使改变了人工耳蜗的几何形状和位置，插入人工耳蜗也只能显示出与不植入情况下最大 4dB 的残余听力损失差异。如果圆窗的劲度相同，模拟结果表明，为了在 700Hz 以下频率保留残余听力，应使用插入侧部的薄直人工耳蜗。此外，当基底膜和人工耳蜗之间的距离较近时，高频超过 1kHz 时残余听力损失会变得更加严重。这些结果有助于根据患者的情况选择人工耳蜗。
