Preliminary assessment of remote photoelectric excitation of an actuator for a hearing implant.

Preliminary assessment of remote photoelectric excitation of an actuator for a hearing implant. Research Abstract Details 

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Preliminary assessment of remote photoelectric excitation of an actuator for a hearing implant. Abstract Text:

Zhigang Wang,Eric Abel,Robert Mills,

Sound modulated infrared (IR) light, as an alternative signal (and energy) transmission method, was evaluated for remote powering of a hearing implant via an implanted photodiode receiver. One human cadaveric temporal bone was used to test this concept by locating an IR source (LED) in the ear canal 4 mm away from the eardrum and a photodiode in the middle ear cavity. The photodiode output was directly used to drive a piezo-ceramic disc actuator which was located externally for facilitating the test. The displacement frequency response of the actuator was measured by a laser vibrometer. It was found that, at a LED current of 8.6 mA, the actuator displacement was about 22.4 nm, equivalent to a stapes displacement from about 91 dB sound-pressure-level (SPL) stimulation at the eardrum. The IR light transmittance through the eardrum (compared to through an air path) was about 67%. The LED optical power was 0.77 mW (its maximal irradiance was about 3.95 mW/cm²) which is a safe to the human body. Current consumption can be reduced by a factor of 3-5 by using a more efficient LED and photodiode.

Preliminary assessment of remote photoelectric excitation of an actuator for a hearing implant. Publishing Authors By Initials

Z Wang,E Abel,R Mills,

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Preliminary assessment of remote photoelectric excitation of an actuator for a hearing implant. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Conference proceedings : ... Annual International

VOLUME: 6

Page Numbers: 6233-4

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ISSN: 1557-170X

DAY: 6

MONTH: 02

YEAR: 2005

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LANGUAGE: eng

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AFFILIATION: Member, IEEE, Division of Mechanical Engineering and Mechatronics, University of Dundee, Dundee DD1 4HN, UK (phone: +44 1382 345484; fax: +44 1382 345508; e-mail: z.z.wang@dundee.ac.uk).

Country: United States

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