Development of Animated Expression of Eardrum Vibration

点击翻译按钮获取中文摘要

First, geometry of the finite-element method (FEM) middle ear model was determined from the measurement results of the human temporal bones by means of the computer aided three-dimensional reconstruction method. Then, mechanical properties and boundary conditions of the middle ear model were determined by a comparison between the numerical results obtained from the FEM analysis and the measurement results of the fresh cadavers and patients, which were obtained by our developed middle ear analyser (MEA). Finally, the animated expression of the analytical results of the FEM middle ear model was attempted. The of following conclusions can be drawn.(1) "Elastic" boundary condition consisting of linear and torsional springs at the eardrum attachments to the annular ligament is more appropriate for the actual condition than "fully clamped" one.(2) Complicated and frequency-dependent eardrum and mossicular chain vibration modes are obtained by taking account of the functions of muscles and ligaments of the mossicular and of incudostapedial Joint.(3) Animated expression of the middle ear vibration enables us to understand its complex dynamic behavior easily.(4) Applying the FEM middle ear model, numerical simulation of ossicular chain separation and fixation patients is carried out, and their dynamic behavior is clarified.