As a bridge from the sound signal in the air to the sound perception of the inner ear auditory receptor, the tympanic membrane and\nossicular chain of the middle ear transform the sound signal in the outer ear through two gas-solid and solid-liquid conversions. In\naddition, through the lever principle formed by three auditory ossicle structure, the sound was concentrated and amplified to the\ninner ear. However, the sound transmission function of the middle ear will be decreased by disease, genetic, or trauma. Hence, using\nmiddle ear prosthesis to replace the damaged ossicles can restore the conduction function. The function realization of middle ear\nprosthesis depends on the vibration response of the prosthesis from the tympanic membrane to the stapes plate on the human\nauditory perception frequency, which is affected by the way the prosthesis combined with the tympanic membrane, the material,\nand the geometric shape. In this study, reasonable prosthetic structures had been designed for different types of ossicular chain\ninjuries, and the frequency response characteristics were analyzed by the finite element method then. Moreover, in order to\nachieve better vibration frequency response, a ball structure was designed in the prosthesis to simulate its amplification function.\nThe results showed that the middle ear prostheses constructed by different injury types can effectively transfer vibration energy.\nIn particular, the first- and second-order resonant frequencies and response amplitudes are close to each other when ball\nstructure models of different materials are added. Instead, the resonance frequency of the third stage formed by aluminum alloy\nball materials is larger than that of the other two, which showed good response features.
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