植入型骨導式助聽器之研製

An implant bone conduction hearing aid

陳敏智(Min-Chih Chen)

指導教授 ： 蔡正倫

中原大學/工學院/醫學工程研究所/碩士(2006年)

https://doi.org/10.6840/CYCU.2006.00470

摘要

ㄧ般的骨導式助聽器是靠骨導震動器產生聲頻的機械震動，將骨導震動器放置在耳後乳突股附近，聲波因骨傳導特性傳到內耳，使聽障病患產生聽覺，缺點是其能量會被軟組織所吸收，造成聲波傳導效率變差，解決這個問題的方法，是將骨導震動器盡量安置在接近頭骨的位置上，不需經過軟組織，使其聲波能量不被衰減，本研究的目的，是針對上述的概念，研製完全植入型的骨導式助聽器。
將重量0.2g的磁鐵，包覆在矽膠裡，植入到皮膚組織裡，當聲波被麥可風偵測到後，聲音訊號經過放大器放大後，以電流的形式來驅動電磁驅動器，電磁驅動器主要元件是磁鐵震動子，而震動子植入在皮下3mm厚度，磁鐵震動子被驅動後，會產生相對應頻率的震動，磁鐵震動子與頭骨之間相隔厚度約0.4mm，震動子所產生的機械震動，被有效的穿過頭骨，震動的頻寬超過3000Hz，不過正確的設計，應該是要使植入的震動子震動頻寬可以超過5000Hz。

關鍵字

震動 ； 電磁驅動器 ； 骨導式助聽器

並列摘要

Bone conduction hearing aid devices generally suffer from their low vibration transmission through soft tissue. One way to solve this problem is to place the vibrator as close to the skull as possible. The purpose of this study is to develop such an implant type of bone conduction hearing aid device.
A 0.2 gram of permanent magnet enclosed in silicon rubber can be implanted underneath skin tissue. When sound wave is detected by a microphone, the acoustic signal is amplified to drive an external electromagnetic actuator. Then, the implanted magnetic vibrator is driven by the actuator through 3 mm thick of skin to vibrate in the corresponding frequency. Since the silicon rubber layer between the magnetic vibrator and the skull is only 0.4 mm thick, the mechanical vibration can be efficiently transmitted to the skull. The vibration bandwidth of current device is over 3000 Hz. A careful design of the implant vibrator should be able to extend the bandwidth to over 5000 Hz.

並列關鍵字

bone conduction hearing aid ； magnetic vibrator ； vibrati

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