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Wave propagation across the skull under bone conduction: Dependence on coupling methods.

Tahmine S Farahmandi1, Ivo Dobrev1, Namkeun Kim2

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zürich, University of Zürich, Rämistrasse 100, 8091 Zürich, Switzerland.

The Journal of the Acoustical Society of America
|April 2, 2022
PubMed
Summary
This summary is machine-generated.

This study investigated how bone conduction hearing aid (BCHA) coupling methods affect skull bone wave propagation. Stiffer coupling at the bone anchored hearing aid (BAHA) location reduced transition frequency to wave motion compared to the mastoid.

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Area of Science:

  • Biomechanics
  • Biomedical Engineering
  • Acoustics

Background:

  • Bone conduction hearing aids (BCHA) transmit sound via skull vibrations.
  • Understanding wave propagation through the skull is crucial for optimizing BCHA performance.
  • Different coupling methods may influence vibration transmission and hearing outcomes.

Purpose of the Study:

  • To quantitatively investigate skull bone wave propagation under different bone conduction hearing aid (BCHA) coupling methods.
  • To compare the effects of percutaneous (Baha Connect) and transcutaneous (Baha Attract) coupling versus a traditional headband.
  • To analyze the influence of coupling location (mastoid vs. BAHA location) on wave propagation.

Main Methods:

  • Experiments were performed on Thiel embalmed human cadaver heads.
  • Surface motion was measured using a 3D laser Doppler vibrometer (3D LDV) at approximately 200 points.
  • A modified LiUHead finite element model (FEM) was used to simulate the experimental procedures.

Main Results:

  • Wave propagation initiated near the stimulation area (250-500 Hz), spreading to the skull surface (0.5-2 kHz) and then the entire skull (>3-4 kHz).
  • Stiffer coupling (Connect) resulted in a faster transition to wave motion and a lower transition frequency compared to the headband.
  • These effects were more pronounced at the BAHA location than the mastoid, which showed less sensitivity to coupling conditions.

Conclusions:

  • Coupling method and location significantly influence bone conduction hearing aid (BCHA) wave propagation through the skull.
  • Stiffer coupling, particularly at the BAHA location, promotes earlier and more widespread wave motion.
  • Findings provide insights for optimizing BCHA design and placement for improved auditory perception.