Abstract
Experiments were conducted to evaluate a silicon accelerometer as an implantable sound sensor for implantable hearing aids. The main motivation of this study is to find an alternative sound sensor that is implantable inside the body, yet does not suffer from the signal attenuation from the body. The merit of the accelerometer sensor as a sound sensor will be that it will utilize the natural mechanical conduction in the middle ear as a source of the vibration. With this kind of implantable sound sensor, a totally implantable hearing aid is feasible. A piezoresistive silicon accelerometer that is completely encapsulated with a thin silicon film and long flexible flex-circuit electrical cables were used for this study. The sensor is attached on the middle ear ossicles and measures the vibration transmitted from the tympanic membrane due to the sound in the ear canal. In this study, the sensor is fully characterized on a human cadaveric temporal bone preparation.
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Acknowledgements
This work was supported by DARPA HERMIT (ONR N66001-03-1-8942), Bosch Palo Alto Research and Technology Center, a CIS Seed Grant, The National Nanofabrication Users Network facilities funded by the National Science Foundation under award ECS-9731294, and The National Science Foundation Instrumentation for Materials Research Program (DMR 9504099). The authors would especially like to thank Gary Yama1, Markus Lutz2, and Aaron Partridge2 for their guidance and assistance in the device design and fabrication (1Robert Bosch Corporation, 2Robert Bosch Corporation, currently at SiTime).
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Park, WT., O’Connor, K.N., Chen, KL. et al. Ultraminiature encapsulated accelerometers as a fully implantable sensor for implantable hearing aids. Biomed Microdevices 9, 939–949 (2007). https://doi.org/10.1007/s10544-007-9072-4
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DOI: https://doi.org/10.1007/s10544-007-9072-4