砧骨激励式人工中耳作动器的设计及实验

为治疗感音神经性听力损伤，设计的中耳植入式助听器，近年来已成为国内外研究的热点。提出一种砧骨激励式中耳植入助听装置，设计时综合考虑植入位置、空间、手术过程等，并对加工出的装置进行了相关实验。该装置采用压电式作动器，结构简单，作动器产生的力能够高效地传送至听骨链。在设计过程中使用有限单元法（FEM）对装置的共振频率和输出位移进行预估，仿真及实验结果说明该作动器具有良好的动态响应特性，谐波失真度小于1 %，在6.9 Vrms电压驱动下能够提供相当于鼓膜处90 dB SPL激励的效果，可以激励镫骨产生足够的位移以补偿听力损失，是一款有效的助听装置。

Design and Experiment of the Actuator of an Incus Driving Type Middle Ear Implant

The middle ear implantable hearing aid, as a new treatment for sensorineural hearing loss, has attracted more attentions of researchers. A new kind of incus driving type middle ear implant, which contains a stack of piezoelectric crystals in a compact structure and a position adjustment apparatus, is proposed in this paper. In the design of the hearing aid apparatus, the embedded location, space, and the implant surgery process, etc. are considered. Finite element method （FEM） is used to assess resonant frequency and output displacement of the device. It is shown that the designed apparatus can be implanted in the middle ear cavity easily, has a good dynamic response, and the total harmonic distortion is below 1 %. Temporal bone experiment reveals that stapes displacement under actuator stimulation of 6.9 Vrms is higher than that under acoustic stimulation of 90 dB SPL over the operating frequency range, which can be applied to compensate the hearing loss.