- 學位論文
骨導助聽器與頭骨震動之模擬
Simulation of Skull Vibration of Bone Conduction Hearing Aid
摘要
先天性外耳道閉鎖的幼年病患，因骨頭發育未完全，並不適合採用外科植入性助聽器的手術，但對於新生兒來說，錯過前三年聽障治療黃金時期，將導致孩童語言能力發展的遲滯。故本研究主要目的在於發展可用於新生兒之非侵入式骨導式助聽器，以頭帶或眼鏡型架構固定，無須藉由外科手術。為了設計出最理想的助聽器架構，採用有限元素分析法協助骨導式助聽器之設計，並透過模擬探討頭骨動態特性及頻率響應。模擬結果顯示，包含頭骨、頭皮及腦組織的模型，共振頻率落在約1.3kHz 處。將相同規格的震動端以人工乳突骨來實測其震動力量，結果顯示最大值在1.5kHz 處，兩者結果相近。而讓聽損受測者實測聽力圖時，此研究之骨導式助聽器對於中度聽損的受測者其輸出是足夠的，但對於高頻聽損較嚴重部分已經無法判斷其頻率聽損程度，所以沒有足夠的資訊判斷輸出功率是否足夠。
並列摘要
Hearing air implant is no suitable for a new born baby suffering from congenital aural atresia, because its skull is not fully developed. Since the critical period of speech and language development is during the first three years of life, it has to be exposed to verbal stimulation as soon as possible. The purpose of this study is to develop an external bone conducting hearing aid for a new born child. A headband fixed hearing aid is easy to wear, low price, and no surgery required. In order to optimize the performance of hearing aid, finite element analysis was applied in designing the structure of actuator. The dynamic characteristics of skull with soft tissue were also simulated to find the frequency response. The simulation result shows that the resonant frequency is at 1.3 kHz. This is close to the resonant frequency of 1.5 kHz measured by using an artificial mastoid. Although the output power in the middle frequency range is strong enough for mild hearing loss, it is still difficult to in the high frequency range. This is because the hearing loss of the subjects is too severe to hear anything above 1 kHz.