Development of Animated Expression of Eardrum Vibration

首先，利用计算机辅助三维重建方法，根据人体颞骨的测量结果确定有限元中耳模型的几何形状。然后，将有限元分析的数值结果与自行研制的中耳分析仪(MEA)的新鲜身体和患者的测量结果进行比较，确定了中耳模型的力学性质和边界条件。最后，对有限元中耳模型的分析结果进行了动画表达。得出以下结论：(1)在环形韧带的鼓膜附着处，由线性弹簧和扭转弹簧组成的“弹性”边界条件比“完全固定”的边界条件更适合实际情况。(2)考虑到马筋和砧骨关节肌肉和韧带的作用，得到了复杂的、与频率相关的鼓膜和马脊链振动模式。(3)中耳振动的动画表达使我们能够更容易地了解其复杂的动态行为。(4)应用有限元中耳模型，对听骨链分离和固定患者进行了数值模拟，阐明了其动力学行为。

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.