Ladak H M, Funnell W R
Department of BioMedical Engineering, McGill University, Montréal, Québec, Canada.
J Acoust Soc Am. 1996 Aug;100(2 Pt 1):933-44. doi: 10.1121/1.416205.
In this work, three-dimensional finite-element models of the normal and surgically repaired cat middle ear were developed. The normal middle-ear model was formed by adding explicit representations for the footplate and cochlear load to an existing model of the cat eardrum. The footplate was modeled as a thin plate with a thickened rim. The cochlear load was represented by springs attached along the footplate's periphery. The model is valid for frequencies below 1 kHz and for physiological sound levels. Eardrum and manubrium displacement, and out-of-plane displacements of the footplate's center, were found to compare well with experimental results. The normal model was modified to simulate the effects of two types of middle-ear surgery, both of which are used to repair a discontinuous ossicular chain. Bulging of the footplate was found to occur when a prosthesis made direct contact with the footplate. The location of the prosthesis along the manubrium did not affect the motion of the footplate as long as the joints were all rigid. When the joints were flexible, the largest displacements occurred when the prosthesis was positioned near the upper end of the manubrium.
在这项工作中，建立了正常和经手术修复的猫中耳的三维有限元模型。正常中耳模型是通过在现有的猫鼓膜模型中添加镫骨足板和耳蜗负载的显式表示而形成的。镫骨足板被建模为一个边缘加厚的薄板。耳蜗负载由沿足板周边连接的弹簧表示。该模型在低于1kHz的频率和生理声级下有效。发现鼓膜和锤骨位移以及足板中心的平面外位移与实验结果吻合良好。对正常模型进行了修改，以模拟两种中耳手术的效果，这两种手术均用于修复不连续的听骨链。当假体与足板直接接触时，发现足板会凸出。只要关节都是刚性的，假体沿锤骨的位置就不会影响足板的运动。当关节灵活时，假体位于锤骨上端附近时会出现最大位移。
