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Dynamic behavior of the middle ear based on sweep frequency tympanometry
H Wada1, T Kobayashi, M Suetake
1Department of Mechanical Engineering, Tohoku University, Sendai, Japan.
Summary
A new apparatus accurately measures sound pressure and phase variations. This device aids in distinguishing ossicular chain disorders from normal hearing, improving clinical diagnosis.
Area of Science:
- Audiology
- Medical Instrumentation
- Otolaryngology
Background:
- Diagnosing ossicular chain disorders like separation and fixation can be challenging with standard tympanometry using low probe frequencies (e.g., 220 Hz).
- Existing methods may lack the precision to differentiate subtle abnormalities in middle ear function.
Purpose of the Study:
- To develop and evaluate a novel measuring apparatus for assessing middle ear function.
- To determine if the new apparatus can effectively distinguish ossicular chain disorders from normal subjects.
Main Methods:
- Development of a measuring apparatus with a probe tip exhibiting flat frequency characteristics.
- Measurement of absolute sound pressure and absolute phase variations against sweeping frequency and external auditory canal pressure.
Main Results:
- The apparatus successfully measured sound pressure and phase variations across a range of frequencies and pressures.
- Distinct differences were observed between patients with ossicular chain disorders and normal subjects using this apparatus.
- The results clearly differentiated between pathological and normal middle ear conditions.
Conclusions:
- The developed measuring apparatus provides a more precise method for evaluating middle ear function compared to conventional tympanometry.
- This apparatus shows significant potential for clinical application in the accurate diagnosis of ossicular chain disorders.