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Mass loading on the ossicles and middle ear function.

R Z Gan1, R K Dyer, M W Wood

  • 1Hough Ear Institute, Oklahoma City, OK 73112, USA.

The Annals of Otology, Rhinology, and Laryngology
|May 25, 2001
PubMed
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Adding mass to the middle ear ossicles impairs sound transmission. Increased implant mass on the ossicular chain significantly reduces stapes footplate displacement, potentially worsening hearing thresholds.

Area of Science:

  • Biomedical Engineering
  • Otolaryngology
  • Acoustics

Background:

  • The middle ear functions as a levered vibrating system for sound transmission.
  • Changes in ossicular chain mass can affect middle ear mechanics and sound conduction.
  • Implantation of middle ear prostheses can alter residual hearing and frequency response.

Purpose of the Study:

  • To investigate the effects of mass loading on middle ear transfer functions.
  • To quantify the impact of implant mass on ossicular dynamics.
  • To determine the relationship between added mass and hearing thresholds.

Main Methods:

  • Experiments conducted on 17 human temporal bones (fresh or fresh-frozen).
  • Utilized laser Doppler interferometry to measure middle ear transfer functions.

Related Experiment Videos

  • Tested two implant mass loading conditions across frequencies from 250 to 8,000 Hz.

    • Main Results:

    • Middle ear function linearity remained unchanged under mass loading.
    • Increased mass on the incudostapedial joint decreased stapes footplate displacement.
    • A direct correlation was observed: greater implant mass resulted in less stapes displacement.

    Conclusions:

    • There is a quantitative limit to the acceptable mass on the ossicular chain.
    • Excessive mass loading significantly impairs middle ear function and hearing thresholds.
    • Surgeons and researchers must consider mass loading effects in otologic procedures and device design.