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An Implantable Umbo Microphone For Fully-Implantable Assistive Hearing Devices
Benjamin G Cary1, John Z Zhang1, Christopher I McHugh2
1Massachusetts Institute of Technology.
IEEE Sensors Journal
|October 3, 2023
Summary
This study introduces an implantable microphone that precisely measures umbo displacement for advanced hearing assistance. This innovation aims to fully implant hearing devices, improving lifestyle and sound localization in noisy settings.
Area of Science:
- Biomedical Engineering
- Audiology
- Materials Science
Background:
- Current hearing devices have limitations in lifestyle integration and sound localization.
- The tympanic membrane's umbo is a critical point for sensing auditory vibrations.
Purpose of the Study:
- To develop an implantable microphone for sensing umbo displacement.
- To enable fully implantable hearing assistive devices.
Main Methods:
- A piezoelectric polyvinylidene fluoride (PVDF) film sensor with copper-nickel electrodes was designed.
- The sensor was suspended on a brass cylinder, positioned to detect umbo movement.
- Acoustic signals were converted to electrical signals via piezoelectric effect and amplified.
Main Results:
- The sensor accurately captured static and dynamic displacements of the umbo.
- The developed system generated a usable output signal after amplification and filtering.
- The technology facilitates the complete implantation of hearing assistive devices.
Conclusions:
- The implantable PVDF microphone is a viable sensor for umbo displacement.
- This technology supports the development of fully implantable hearing solutions.
- The system has the potential to enhance hearing restoration and sound localization capabilities.
