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A New Trans-Tympanic Microphone Approach for Fully Implantable Hearing Devices.

Seong Tak Woo¹, Dong Ho Shin², Hyung-Gyu Lim³

¹Graduate School of Electronic Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, 41566 Daegu, Korea. biotak@knu.ac.kr.

Sensors (Basel, Switzerland)

|September 16, 2015

Summary

A novel trans-tympanic microphone offers improved hearing aid performance. This implantable microphone enhances sound sensitivity by leveraging natural ear acoustics, overcoming limitations of current fully implantable hearing devices.

Keywords:

cadaveric experiments cochlear implants fully implantable hearing devices implantable microphone trans-tympanic ventilation tube

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Area of Science:

Biomedical Engineering
Otolaryngology
Acoustics

Background:

Conventional hearing aids have limitations.
Fully implantable hearing devices (FIHDs) aim to overcome these drawbacks.
Current implantable microphones in FIHDs face challenges with sensitivity, body noise, and implantation ease.

Purpose of the Study:

To introduce and evaluate a novel trans-tympanic microphone for FIHDs.
To enhance microphone sensitivity and reduce body noise interference.
To assess the feasibility of utilizing natural ear acoustics for improved sound capture.

Main Methods:

Developed a new microphone design implanted at the tympanic membrane.
Measured microphone sensitivity and insertion loss in human cadaveric specimens (0.1–16 kHz).
Assessed maximum stable gain considering feedback with a round-window-drive transducer.

Main Results:

The trans-tympanic microphone demonstrated high sensitivity.
Insertion loss measurements confirmed effective sound transmission.
Stable gain measurements indicated good performance in situ.
The design leverages pinna directionality and ear canal resonances.

Conclusions:

The proposed trans-tympanic microphone shows high-performance capabilities for FIHDs.
This approach offers a promising solution to enhance hearing aid sensitivity and reduce noise.
Further research may lead to improved audiological device technology.