PMID: 9445854Jan 31, 1998Paper

An implantable microphone for electronic hearing aids

HNO
H LeysiefferH P Zenner

Abstract

Fully implantable hearing aids and cochlea implants of the future require an implantable microphone. A hermetically sealed implantable microphone based on the idea of a microphone implanted in the posterior wall of the auditory canal, as suggested by Ohno et al. in 1988, is presented. Through consistent technological and clinical design optimization, it was possible to achieve a membrane diameter of only 4.5 mm (as opposed to 8 mm in the Japanese system) and a significant volume reduction of nearly 50%. The microphone weights only 0.4 g. In spite of this miniaturization, the performance characteristics of the microphone equal those of the Japanese model or are superior. The sound-pressure transfer function shows a very small ripple and the bandwidth amounts to approximately 10 kHz. Because of its high tuning and high no-load resonance frequency, the microphone is mostly insensitive to post-operational changes to the loading mass on the microphone membrane initiated by the covering skin of the auditory canal. The sound-pressure transfer factor at 1000 Hz is approximately 1.5 mV/Pa. Using different manufacturing technologies, this value can be increased in the range of 6-8 dB with a corresponding reduction in bandwidth. Due to th...Continue Reading

Citations

Sep 5, 2003·Acta Oto-laryngologica·Hans Peter ZennerMarcus M Maassen
May 28, 2013·Biomedical Microdevices·S H Arman WooJin-Ho Cho
Nov 26, 2004·The Annals of Otology, Rhinology, and Laryngology·Jean-Yves SichelHaim Sohmer
Sep 12, 2017·Cochlear Implants International·Alistair Mitchell-InnesPhilip Begg
Oct 20, 2001·The Annals of Otology, Rhinology, and Laryngology·M M MaassenH P Zenner
Dec 16, 1998·Lancet·H P Zenner, H Leysieffer

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