Acoustic intensity, impedance and reflection coefficient in the human ear canal

2002 ◽  
Vol 112 (2) ◽  
pp. 600-620 ◽  
Author(s):  
B. L. Farmer-Fedor ◽  
R. D. Rabbitt
Keyword(s):  
Reflection Coefficient ◽  
Ear Canal ◽  
Acoustic Intensity ◽  
Human Ear

3D Finite Element Modeling of Blast Wave Transmission From the External Ear to a Spiral Cochlea

2021 ◽  
Author(s):  
Marcus Brown ◽  
John Bradshaw ◽  
Rong Z. Gan
Keyword(s):  
Finite Element ◽  
Middle Ear ◽  
Basilar Membrane ◽  
Transverse Motion ◽  
Fe Model ◽  
Ear Canal ◽  
Blast Overpressure ◽  
Stapes Footplate ◽  
Human Ear ◽  
Temporal Bones

Abstract Blast-induced injuries affect the health of veterans, in which the auditory system is often damaged, and blast-induced auditory damage to the cochlea is difficult to quantify. A recent study modeled blast overpressure (BOP) transmission throughout the ear utilizing a straight, two-chambered cochlea, but the spiral cochlea's response to blast exposure has yet to be investigated. In this study, we utilized a human ear finite element (FE) model with a spiraled, two-chambered cochlea to simulate the response of the anatomical structural cochlea to BOP exposure. The FE model included an ear canal, middle ear, and two and half turns of two-chambered cochlea and simulated a BOP from the ear canal entrance to the spiral cochlea in a transient analysis utilizing fluid-structure interfaces. The model's middle ear was validated with experimental pressure measurements from the outer and middle ear of human temporal bones. The results showed high stapes footplate displacements up to 28.5µm resulting in high intracochlear pressures and basilar membrane (BM) displacements up to 43.2µm from a BOP input of 30.7kPa. The cochlea's spiral shape caused asymmetric pressure distributions as high as 4kPa across the cochlea's width and higher BM transverse motion than that observed in a similar straight cochlea model. The developed spiral cochlea model provides an advancement from the straight cochlea model to increase the understanding of cochlear mechanics during blast and progresses towards a model able to predict potential hearing loss after blast.

The spatial distribution of sound pressure within the human ear canal

2005 ◽  
Vol 117 (4) ◽  
pp. 2564-2564
Author(s):  
Michael R. Stinson ◽  
Gilles A. Daigle
Keyword(s):  
Spatial Distribution ◽  
Sound Pressure ◽  
Ear Canal ◽  
Human Ear

Three-dimensional digital scanner based on micromachined micromirror for the metrological measurement of the human ear canal

2005 ◽  
Vol 23 (6) ◽  
pp. 2990 ◽  
Author(s):  
M. Prasciolu ◽  
R. Malureanu ◽  
S. Cabrini ◽  
D. Cojoc ◽  
L. Businaro ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Ear Canal ◽  
Human Ear
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