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Related Experiment Videos

Acceleration levels at hearing threshold with direct bone conduction versus conventional bone conduction.

B Håkansson, A Tjellström, U Rosenhall

    Acta Oto-Laryngologica
    |September 1, 1985
    PubMed
    Summary
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    Unilateral versus bilateral bone-anchored hearing aids (BAHAs).

    Cochlear implants international·2008

    Bone-anchored hearing aids offer an alternative for patients with hearing disorders. Direct measurement on titanium implants shows significantly lower acceleration thresholds compared to skin measurements.

    Area of Science:

    • Audiology
    • Biomedical Engineering
    • Neurosurgery

    Background:

    • Conventional hearing aids are unsuitable for some patients with hearing impairments.
    • Bone-anchored hearing aids (BAHA) utilize titanium implants for direct bone conduction.
    • Advancements allow for single-housing BAHA devices, improving patient outcomes.

    Purpose of the Study:

    • To investigate the absolute acceleration thresholds in patients with a single-housing bone-anchored hearing aid.
    • To compare acceleration thresholds measured directly on the titanium implant versus the intact skin surface.

    Main Methods:

    • Absolute acceleration threshold measurements were conducted on 7 patients using a bone-anchored hearing aid for nearly 2 years.
    • A Békésy audiometer and a Brüel & Kjaer 4344 accelerometer were employed.

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  • Measurements were taken across a frequency range of 250 to 6,000 Hz.

    • Main Results:

    • Acceleration levels at hearing threshold decreased by 16 to 28 dB when measured directly on the titanium screw compared to the skin surface.
    • This significant reduction was observed in the 250–6,000 Hz frequency range.
    • The findings suggest that skin and soft tissues act as a shunt, attenuating acceleration signals.

    Conclusions:

    • Direct measurement on the titanium implant of a bone-anchored hearing aid provides a more accurate representation of the acceleration stimulus reaching the bone.
    • The shunting effect of soft tissues should be considered when evaluating hearing aid performance and designing future devices.
    • This study highlights the biomechanical advantages of bone-anchored hearing systems for specific patient populations.