School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, China.
Department of Otorhinolaryngology-Head and Neck Surgery, Zhongshan Hospital affiliated to Fudan University, Shanghai, China.
Int J Numer Method Biomed Eng. 2024 Nov;40(11):e3871. doi: 10.1002/cnm.3871. Epub 2024 Sep 19.
The electromagnetic middle-ear implant (MEI) is a new type of hearing device for addressing sensorineural and mixed hearing loss. The hearing compensation effect of the MEI varies depending on the transducer stimulation sites. This paper investigates the impact of transducer stimulation sites on MEI performance by analyzing stapes spatial motion. Firstly, we constructed a human-ear finite element model based on micro-CT scanning and inverse molding techniques. This model was validated by comparing its predictions of stapes spatial motion and cochlear response with experimental data. Then, stimulation force was applied at four common sites: umbo, incus body, incus long process and stapes to simulate the electromagnetic transducer. Results show that at low and middle frequencies, stapes-stimulating and incus-long-process-stimulating produce similar spatial motion to normal hearing; at high frequencies, incus-body-stimulating produces similar results to normal hearing. The equivalent sound pressure level generated by the stapes piston motion is less sensitive to the stimulation direction than that deduced by the stapes rocking motion.
电磁中耳植入物（MEI）是一种用于解决感音神经性和混合性听力损失的新型听力设备。MEI 的听力补偿效果取决于换能器刺激部位。本文通过分析镫骨空间运动，研究换能器刺激部位对 MEI 性能的影响。首先，我们基于微 CT 扫描和反模技术构建了一个人耳有限元模型。通过将其预测的镫骨空间运动和耳蜗响应与实验数据进行比较，验证了该模型。然后，在四个常见部位施加刺激力：鼓脐、砧骨体、砧骨长突和镫骨，以模拟电磁换能器。结果表明，在低频和中频时，镫骨刺激和砧骨长突刺激产生的空间运动与正常听力相似；在高频时，砧骨体刺激产生的结果与正常听力相似。由镫骨活塞运动产生的等效声压级对刺激方向的敏感性低于由镫骨摆动运动推断出的声压级。
