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The UmboMic: A PVDF Cantilever Microphone.

Aaron J Yeiser¹, Emma F Wawrzynek¹, John Z Zhang²

¹MIT Electrical Engineering and Computer Science (EECS) Department, Cambridge, MA, 02139.

Journal of Micromechanics and Microengineering : Structures, Devices, and Systems

|November 4, 2024

Summary

The UmboMic, a new piezoelectric microphone, shows promise for totally-implantable cochlear implants. Its performance in human temporal bones is comparable to conventional hearing aid microphones.

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Area of Science:

Biomedical Engineering
Acoustics
Materials Science

Background:

Cochlear implants are crucial for hearing restoration.
Current cochlear implants have external components that can impact quality of life.
There is a need for fully implantable hearing devices.

Purpose of the Study:

To introduce the UmboMic, a prototype piezoelectric cantilever microphone.
To evaluate the UmboMic's performance for potential use in totally-implantable cochlear implants.
To assess the feasibility of a polyvinylidene difluoride (PVDF) based microphone with a low-noise amplifier.

Main Methods:

The UmboMic sensor, made of PVDF, was designed to measure eardrum motion at the umbo.
A low-noise charge amplifier was developed to work with the UmboMic sensor.
Performance was tested in fresh cadaveric human temporal bones.

Main Results:

The UmboMic apparatus achieved an equivalent input noise of 32.3 dB SPL from 100 Hz to 7 kHz.
The system demonstrated good linearity and a flat frequency response (within 10 dB) from approximately 100 Hz to 6 kHz.
Performance was found to be comparable to conventional hearing aid microphones.

Conclusions:

The results demonstrate the feasibility of a PVDF-based microphone coupled with a low-noise amplifier.
The UmboMic apparatus represents a significant advancement towards fully implantable cochlear implants.
This technology has the potential to improve the quality of life for cochlear implant users.