Development of a new electromagnetic hearing aid using lightweight coils to vibrate the ossicles via the tympanic membrane

开发新型电磁助听器，使用轻质线圈通过鼓膜振动小骨

• 批准号: 13557143
• 负责人: MATSUKI Hidetoshi
• 金额: $ 8万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13557143/
• 关键词: hearing aid; electromagnetic induction type; middle ear; tympanic membrane; coil; magnet; sensorineural hearing loss; 新駆動方式; 電磁誘導; 耳小骨; 伝音特性

A newly developed electromagnetic hearing aid can generate high-excitation force to vibrate ossicles via the tympanic membrane by repulsive force, which acts between the magnet and the vibrator coil attached to the tympanic membrane. Therefore, to obtain the high-excitation force, it is important to evaluate a magnetic field generated by the vibrator coil.First, a driving coil, which applies an electrical current to the vibrator coil, was designed so as to generate the greatest excitation force. Optimally designed coil was then coupled to an amplifier and the excitation force generated by the hearing aid was measured using an artificial middle ear, which simulates middle ear of the human. The following conclusions can be drawn.1. When a sound pressure of 60 dB SPL (normal speech level) was applied to the newly developed hearing aid, it generated the excitation force of 100 dB SPL in terms of sound pressure above 3 kHz. This value is sufficient to treat patients with sensorineural hearing loss up to 80dB HL.2. The excitation force of this hearing aid was not sufficient at tow frequencies. This result indicates that improvement of the amplifier is necessary further.

一种新开发的电磁助听器可以通过磁铁和附着在鼓膜上的振荡器线圈之间的排斥力产生高激励力，通过鼓膜振动听小骨。因此，为了获得高的激振力，评估振子线圈产生的磁场是很重要的。首先，设计了一个驱动线圈，向振子线圈施加电流，以产生最大的激振力。然后，将优化设计的线圈耦合到放大器，并使用模拟人类中耳的人造中耳来测量助听器产生的激励力。可以得出以下结论：1.当新研制的助听器施加60dBSPL(正常语音级)的声压时，它在3 kHz以上的声压下产生100dBSPL的激励力。这个值足以治疗感觉神经性听力损失高达80dBHl.2的患者。这种助听器在两个频率下的激励力都不够大。这一结果表明，该放大器仍需进一步改进。