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A new forehead-mounted surface microphone provides audibility estimates equivalent to traditional skull simulators for bone conduction hearing aid users. This innovative tool offers a viable alternative for measuring bone conduction device performance.

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Area of Science:

  • Audiology and Hearing Science
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Traditional skull simulators are used for audibility measurements in bone conduction hearing aid users.
  • Skull simulators have limitations, particularly with bone conduction devices that have intact skin.
  • A novel forehead-mounted surface microphone has been developed for audibility assessment.

Purpose of the Study:

  • To evaluate the audibility estimation equivalence of a new surface microphone compared to a skull simulator.
  • To assess the reliability and potential applications of the surface microphone for bone conduction device verification.

Main Methods:

  • A within-subjects, repeated measures design was employed with 21 adult bone conduction users.
  • Audibility was measured using both a skull simulator and a surface microphone at three input levels (55, 65, 75 dB SPL).
  • Data analysis involved a mixed ANOVA, with adjustments for multiple comparisons using the Holm-Bonferroni method.

Main Results:

  • The surface microphone demonstrated equivalent audibility measurements to the skull simulator for the majority of comparisons.
  • Five comparisons showed significant differences, but the mean difference was small (3.3 dB).
  • Test-retest reliability of the surface microphone was established.

Conclusions:

  • The forehead-mounted surface microphone is a viable tool for audibility verification in percutaneous bone conduction users.
  • This new device overcomes the limitations of skull simulators for devices with intact skin.
  • The surface microphone has potential for measuring various bone conduction devices, including those without percutaneous implants.