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Surface Motion Changes of Tympanic Membrane Damaged by Blast Waves.
1Biomedical Engineering Laboratory,School of Aerospace andMechanical Engineering,University of Oklahoma,865 Asp Avenue,Norman, OK 73019e-mail: rgan@ou.edu.
Journal of Biomechanical Engineering
|June 20, 2019
Summary
Blast exposure alters eardrum (tympanic membrane) movement, increasing displacement in specific regions. This study reveals how blast waves damage the eardrum
Area of Science:
- Biomechanics
- Otolaryngology
- Acoustics
Background:
- The eardrum (tympanic membrane) transmits sound to the middle ear.
- Blast overpressure can alter eardrum microstructure and mechanical properties.
- The effect of blast-induced biomechanical changes on eardrum motion remains unclear.
Purpose of the Study:
- To investigate the impact of blast exposure on human eardrum surface motion.
- To correlate experimental findings with a finite element model of eardrum damage.
Main Methods:
- Scanning laser Doppler vibrometry was used to measure eardrum surface motion in human temporal bones.
- A finite element model simulating blast wave damage to the eardrum's multilayer structure was developed.
Main Results:
- Increased eardrum displacement was observed in the posterior region between 3-4 kHz after blast exposure.
- Experimental data showed good agreement with the finite element model's simulated motion.
- Findings suggest blast injuries result from altered mechanical properties and collagen fiber discontinuity.
Conclusions:
- Blast waves significantly alter eardrum surface motion, particularly in specific regions.
- The study provides evidence of blast-induced eardrum damage and identifies potential fiber injury locations.
- Understanding these changes is crucial for assessing blast-related hearing trauma.
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