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传导性耳聋多由鼓膜或听骨链病变所致。缘于中耳解剖结构和传音机制的复杂,目前通过临床治疗未能使患者获得理想的听力。基于临床CT扫描结果建立中耳有限元模型,并应用动力学的传导振动原理,对中耳结构进行数值计算分析,得到鼓膜振幅分布及听骨链结构的应力场。分析并得到结论:鼓膜与锤骨接触的边界区域是鼓膜最容易穿孔部位;砧镫骨关节的邻近区域是听骨链结构最容易破坏部位。该结论与临床统计的中耳易病变位置相吻合。此研究从力学机理解释了中耳的病变机理,可为耳临床医学提供新的研究视角。
Conductive deafness caused by tympanic membrane or ossicular chain lesions. Due to the complexity of the middle ear anatomy and the mechanism of sound transmission, the current clinical treatment fails to give the patient an ideal hearing. The middle ear finite element model was established based on the results of clinical CT scan. The structure of the middle ear was numerically calculated and analyzed by using the principle of dynamic conduction vibration. The amplitude distribution of the tympanic membrane and the stress field of the ossicular chain structure were obtained. It is concluded that the boundary area between the tympanic membrane and the malleus is the easiest perforation site of the tympanic membrane. The adjacent area of the ankle joint is the most vulnerable site of the ossicular chain structure. This conclusion is consistent with the clinical statistics of the location of middle ear lesions. This study explains the mechanism of the middle ear pathology from the mechanical mechanism, which can provide a new perspective for the clinical study of the ear.