An implant bone conduction hearing aid

• Main Authors: Min-Chih Chen, 陳敏智
• Other Authors: Cheng-Lun Tsai
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/37138295046882176430

碩士 === 中原大學 === 醫學工程研究所 === 94 === 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.