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The floating mass transducer as a microphone-a pilot study.

Stefan Kaulitz1,2, Carolina Köstler3, Kristen Rak3

  • 1Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Hals-Chirurgie, Universitätsklinikum Würzburg, Würzburg, Germany. info@hno-sw.de.

HNO
|June 3, 2025
PubMed
Summary
This summary is machine-generated.

The Vibrant Soundbridge® Floating Mass Transducer (FMT) shows potential as a middle ear microphone. Further research is needed to confirm its suitability for fully implantable hearing systems.

Keywords:
Cochlear implantImplantable neurostimulatorsMiddle earMiddle ear implantProstheses and implants

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Area of Science:

  • Biomedical Engineering
  • Acoustics
  • Audiology

Background:

  • Investigating the novel application of the Vibrant Soundbridge® Floating Mass Transducer (FMT) as a microphone.
  • Exploring potential for FMT in fully implantable cochlear implant systems.

Purpose of the Study:

  • To assess the acoustic properties of the FMT when used in reverse as a microphone.
  • To evaluate the feasibility of FMT as a middle ear microphone.

Main Methods:

  • Experimental measurements using an ear canal-eardrum model.
  • Analysis of FMT frequency response and sensitivity when coupled to an artificial eardrum.

Main Results:

  • The FMT demonstrated usable signal-to-noise performance across the tested frequency range.
  • A non-linear frequency characteristic was observed, with peak sensitivity between 1500 and 2000 Hz.

Conclusions:

  • The FMT shows promise as a middle ear microphone, particularly if optimized for microphone characteristics.
  • Further investigation, including measurements on petrous bone, is necessary to fully determine its suitability for implantable hearing systems.