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Wednesday, July 10 • 10:30 - 10:50
EFFECTS OF HELICOTREMA SIZE IN THE MOTIONS OF BASILAR MEMBRANE WITH CONSIDERATION OF FLUID-STRUCTURE INTERACTIONS

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Helicotrema is a small hole that connects the scala vestibule and scala tympani in the cochlea. The effects of the helicotrema size in the motions of the basilar membrane were investigated in this study using the finite element (FE) analysis models with considering the fluid-structure interactions. The finite element model includes the basilar membrane, the oval window, the round window, the osseous spiral lamina and cochlear fluid. The fluid-structure interactions were considered with assumptions of compressible fluid and small displacements using the finite element formulation. The developed FE model showed good agreement with published measurement data. Using the developed FE model, the motions of the basilar membrane, pressure distributions on the basilar membrane and the particle motions of the cochlear fluid in the cochlear duct were calculated and compared according the size of the helicotrema. The cochlear input impedances with respect to the helicotrema were also calculated. The calculated results showed that the size of the helicotrema has large influence on the cochlear input impedance as well as the motions of the basilar membrane at the very low frequencies. The possibility of the influences of the helicotrema size on the hearing sensitivity was also discussed.

Moderators
BJ

Benoît Jutras

Professeur titulaire, Université de Montréal

Authors

Wednesday July 10, 2019 10:30 - 10:50 EDT
Outremont 6
  T09 Audiology… & comm. in noise, RS01 Psycholog & physiolog ac