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Implantable Hearing AidReport of the First Human Applications
Naoaki Yanagihara, MD;
Hiroshi Aritomo, MD;
Eizo Yamanaka, MD;
Kiyofumi Gyo, MD
Arch Otolaryngol Head Neck Surg. 1987;113(8):869-872.
Abstract
• To our knowledge, this is the first report of human application of the partial implantable hearing aid. Direct driving of the stapes by an ossicular vibrator of piezoelectric ceramic bimorph is the fundamental mechanism of this device. Acoustic signals received by a microphone were transmitted to the external link coil after amplification. By means of electromagnetic induction, the internal coil placed under the retroauricular skin excited electroacoustic energy, which is transmitted to the vibrator directly coupled with the stapes. The device used in this first patient has been functioning for longer than one year. Excellent frequency response of the vibrator and highly efficient direct transmission of electroacoustic signals to the inner ear gave rise to acoustic perception of superior quality that could not be obtained by other surgical or rehabilitative measures.
(Arch Otolaryngol Head Neck Surg 1987;113:869-872)
Author Affiliations
From the Department of Otolaryngology, Ehime (Japan) University School of Medicine.
Footnotes
Accepted for publication Oct 10, 1986.
Reprint requests to Department of Otolaryngology, Ehime University School of Medicine, Shigenobu-cho, Onsen-gun, Ehime 791-02, Japan (Dr Yanagihara).
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