A FULLY-IMPLANTABLE MEMS-BASED AUTONOMOUS COCHLEAR IMPLANT

2022 IEEE 35TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS CONFERENCE (MEMS)(2022)

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Abstract
This paper reports a fully implantable, MEMS-based, low-power, energy harvesting, next generation cochlear implant (CI). The implant includes multi-frequency piezoelectric transducers for sound detection and energy harvesting, rectification and signal conditioning electronics, and RF coil for fitting and external powering. These units have outstanding performances: multi-channel transducer can generate 50.7 mV(pp) (under 100 dB SPL) and recover the daily sound speech signals; signal conditioning IC consumes outstandingly low power (<500 mu W) while converting outputs signals of the transducer to biphasic pulses; piezoelectric energy harvester has the highest power density (1.5 x 10(-3) W/cm(3)) with generated 16.25 mu W under 120 dB-A sound input; energy harvester IC, provides up to 500% more power compared to an ideal full-bridge rectifier.
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Key words
Fully Implantable Cochlear Implant, MEMS, Acoustic Transducer, Acoustic Energy Harvester, Low Power Electronics
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