中耳积液对声音传导的影响

目的：研究中耳积液对声音传导的影响。方法：通过中耳CT扫描,结合自编C＋＋程序读取CT数据中体单元建立人耳结构几何模型,将几何模型导入PATRAN中建立数值模型,进行正常耳谐响应分析,并把分析结果与实验测试结果进行对比,验证了本文模型正确。利用本模型分析中耳积液对声音传导的影响。结果：中耳积液导致鼓膜凸和镫骨底板的振幅减少,使得传入内耳的能量减弱,导致听力损失。结论：从力学原理分析出中耳积液造成传导性耳聋疾患的病变机理,为耳临床医学提供新的研究视角。

The Effect of Middle Ear Effusion on Sound Transmission

Objective：To study the effect of the effusion of the middle ear on sound transmission.Methods： The geometrical model of human ear was established by an original C＋＋ program using clinical CT data.The geometrical model was imported into the finite element software PATRAN to build up the numerical model of human ear structure.The accuracy of this numerical model was confirmed by comparing data obtained from the numerical model with experimental data on frequency response in human temporal bones.This numerical model was used to analyze how the effusion in the middle ear cavity affects the sound transmission.Results： The results showed that the effusion of the middle ear decrease the amplitude of stapes footplate and umbo,weaken the incoming energy of the inner ear,thus leading to hearing loss.Conclusions： This study give a demonstration on how the effusion of the middle ear cause the conductive deafness based on mechanical principles,and provided a new perspective for the clinical ear research.