Abstract
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 tight 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/cm(2)) 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.
Original language | English |
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Title of host publication | Conference proceedings of the 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society |
Place of Publication | New York |
Publisher | IEEE Engineering in Medicine and Biology Society |
Pages | 6233-6234 |
Number of pages | 2 |
Volume | 6 |
ISBN (Print) | 0780387406 |
Publication status | Published - 2005 |
Event | 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Shanghai, China Duration: 1 Sept 2005 → 4 Sept 2005 http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=10755 |
Conference
Conference | 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society |
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Country/Territory | China |
City | Shanghai |
Period | 1/09/05 → 4/09/05 |
Internet address |