PMID: 9445853Jan 31, 1998Paper

An implantable piezoelectric hearing aid transducer for inner ear deafness. II: Clinical implant

HNO
H LeysiefferH P Zenner

Abstract

A miniature, hermetically sealed implant was development and manufactured in several clinical and technical iteration steps based on the prototype of an implantable piezo-electric hearing-aid transducer described in Part 1 of the work presented here. The transducer is made of pure titanium (medical grade 2, ASTM F67) and designed to be implanted into the mastoid cavity. Transfer of mechanical oscillations to an ossicle in the middle ear is effected by a fixed directly coupling rod of pure titanium or via suitable coupling elements. The transducer is highly tuned with a resonance frequency in the range of 7-10 kHz, depending on the dynamic mass load. Below this resonance and down to low frequencies, the frequency response of elongation is smooth with a very small ripple of less than +/- 1 dB. Unlike the prototype, an increase in vibration amplitude of around 10 dB was achieved for a comparable power consumption. Vibration amplitude at low and middle frequencies is about 60 nm with a transducer voltage of 1 V, corresponding to an equivalent sound-pressure level of around 100 dB SPL at up to 1 kHz. At higher frequencies of up to 10 kHz, the output level increases to beyond 130 dB SPL. Nonlinear distortions at maximum volume (1 V) ...Continue Reading

Citations

Nov 4, 1998·Clinical Otolaryngology and Allied Sciences·A F SnikC W Cremers
Sep 10, 2002·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Ingo TodtArne Ernst
Sep 23, 2003·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Eric JavelKai Kroll
Mar 17, 2006·The Laryngoscope·Jesus Rodriguez JorgeMarcus M Maassen
Aug 19, 2014·Biomedical Microdevices·Peyton Elizabeth PaulickMark Bachman
Jun 10, 2016·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Jing ZhangZhushi Rao
Oct 29, 2004·The Laryngoscope·Marcus M MaassenHans P Zenner
Oct 20, 2001·The Annals of Otology, Rhinology, and Laryngology·M M MaassenH P Zenner
Feb 20, 2004·Computers in Biology and Medicine·Christof StiegerJ Jürgen Burger

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