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Related Concept Videos

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Tympanic membrane pressure buffering function at quasi-static and low-frequency pressure variations.

Wasil H M Salih1, Pieter G G Muyshondt2, Joris J J Dirckx2

  • 1Department of Biomedical Physics, Alneelain University, Algamhouria Avenue, Khartoum, Sudan; Laboratory of Biomedical Physics, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.

Hearing Research
|August 12, 2017
PubMed
Summary

The rabbit tympanic membrane effectively buffers middle ear pressure changes at low frequencies. Pressure regulation is less effective at higher frequencies and with larger pressure variations.

Keywords:
Ear canal pressureMiddle ear pressurePressure bufferingPressure regulation

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Area of Science:

  • Otoacoustic Emissions
  • Bioacoustics
  • Middle Ear Mechanics

Background:

  • The tympanic membrane's deformation is crucial for middle ear pressure regulation.
  • Understanding middle ear mechanics is vital for diagnosing and treating hearing conditions.

Purpose of the Study:

  • To investigate middle ear pressure variations in rabbits under controlled sinusoidal pressure changes.
  • To quantify the relationship between applied ear canal pressure and transtympanic pressure difference.

Main Methods:

  • Rabbits were exposed to sinusoidal pressures (0.5 Hz to 50 Hz) with amplitudes from 0.25 kPa to 1 kPa.
  • Transtympanic pressure difference and total harmonic distortion were measured.
  • Analysis focused on frequency and amplitude dependency of pressure regulation.

Main Results:

  • Transtympanic pressure difference increased with frequency, being smallest in the quasi-static range.
  • Response asymmetry was observed, with higher pressures during positive ear canal pressure application.
  • Normalized pressure amplitudes were 60%-70% of applied pressure; total harmonic distortion was low (≤2%) at low amplitudes/frequencies, increasing with higher pressures and frequencies (up to 30%).

Conclusions:

  • Tympanic membrane displacement is most effective for buffering small pressure loads at low frequencies.
  • Middle ear pressure regulation effectiveness decreases with increasing frequency and pressure amplitude.
  • Significant variations in distortion were noted at high pressure amplitudes, indicating complex non-linear behavior.