The UmboMic: A PVDF Cantilever Microphone.
| Autor: | Yeiser AJ; MIT Electrical Engineering and Computer Science (EECS) Department, Cambridge, MA, 02139., Wawrzynek EF; MIT Electrical Engineering and Computer Science (EECS) Department, Cambridge, MA, 02139., Zhang JZ; MIT Mechanical Engineering Department., Graf L; Harvard Medical School and Mass. Eye and Ear Department of OHNS., McHugh CI; Harvard Medical School and Mass. Eye and Ear Department of OHNS., Kymissis I; Columbia University Department of Electrical Engineering., Olson ES; Columbia University Departments of OTO/HNS and Biomedical Engineering., Lang JH; MIT EECS department., Nakajima HH; Harvard Medical School and Eaton-Peabody Laboratories at Mass. Eye and Ear Department of OHNS. |
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| Jazyk: | angličtina |
| Zdroj: | ArXiv [ArXiv] 2023 Dec 22. Date of Electronic Publication: 2023 Dec 22. |
| Abstrakt: | Objective: We present the "UmboMic," a prototype piezoelectric cantilever microphone designed for future use with totally-implantable cochlear implants. Methods: The UmboMic sensor is made from polyvinylidene difluoride (PVDF) because of its low Young's modulus and biocompatibility. The sensor is designed to fit in the middle ear and measure the motion of the underside of the eardrum at the umbo. To maximize its performance, we developed a low noise charge amplifier in tandem with the UmboMic sensor. This paper presents the performance of the UmboMic sensor and amplifier in fresh cadaveric human temporal bones. Results: When tested in human temporal bones, the UmboMic apparatus achieves an equivalent input noise of 32.3 dB SPL over the frequency range 100 Hz to 7 kHz, good linearity, and a flat frequency response to within 10 dB from about 100 Hz to 6 kHz. Conclusion: These results demonstrate the feasibility of a PVDF-based microphone when paired with a low-noise amplifier. The reported UmboMic apparatus is comparable in performance to a conventional hearing aid microphone. Significance: The proof-of-concept UmboMic apparatus is a promising step towards creating a totally-implantable cochlear implant. A completely internal system would enhance the quality of life of cochlear implant users. |
| Databáze: | MEDLINE |
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