Design and Experiment of Eardrum Stimulating Middle Ear Implant Piezoelectric Actuator
A novel suspended piezoelectric actuator has been designed to address issues associated with existing eardrum stimulation middle ear implants,including challenges with accommodating individual variations in ear canal dimensions,insufficient high-frequency gain,and susceptibility to electromagnetic interference.Initially,considering the anatomical structure of the human ear,the mechanical structure and macroscopic dimensions of the actuator are preliminarily designed.Subsequently,to address the issue of inadequate output displacement in the piezoelectric stacks,a displacement amplifier is introduced,and its amplification factor is optimized using a particle swarm optimization algorithm.Following this,a coupled mechanical model of the piezoelectric actuator and the human ear is established to analyze the impact of the mass of the metal shell and the number of layers in the piezoelectric stack on the hearing loss compensation performance of the actuator.The optimal design parameters are determined through this analysis.Finally,a prototype of the actuator is manufactured based on the optimized parameters,and its hearing compensation performance is tested.The results indicate that the actuator possesses a broad operating frequency range(0.2 kHz～10 kHz),low harmonic distortion(THD≤2％)and superior high-frequency performance.This actuator is suitable for compensating hearing loss in eardrum stimulation,offering a new solution for the clinical treatment of hearing impairment.
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