A biomechanical study of the dynamicbehavior of the organ of Corti: effect ofstimulation type on shear gain

摘要

Round window (RW) stimulation is a new type of hearing compensating methodin implantable middle ear hearing device. To evaluate its performance, the organof Corti (OC) vibration in response to normal acoustic stimulation and to roundwindow stimulation were compared. Firstly, a two-dimensional finite elementmodel of the OC was established. Then, the validity of this model was confirmedby comparing the motion of the outer hair cell and inner hair cell obtained by thismodel with published experimental measurements. Finally, the vibration patternof the OC and shear gain of hair bundle was predicted and analyzed. The resultsshow that the shear gain of the RW-stimulation is smaller than the one of normalacoustic stimulation, and more intracochlear pressure or basilar membranedisplacement are needed for the RW-stimulation hearing compensating method.