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目的根据中国健康人体颞骨组织切片数据建立中耳三维有限元模型,分析中耳腔鼓室各组件的几何尺寸,并通过附带软件计算出各听骨的质量属性。方法根据解放军总医院耳鼻咽喉研究所提供的中国正常人颞骨组织切片数据,采用 AutoCAD2005、UG 软件建立了中耳三维实体模型,在 ADINA 有限元软件中使用手动和自动法对中耳三维实体模型进行网格划分。依据中耳解剖学、声学及生物力学等研究的文献数据对模型进行生理加载和边界约束,建立了包含鼓膜、听骨、韧带、肌肉的中耳三维有限元模型。最后,利用软件附带功能测量出中耳实体模型大小以及质量属性两方面内容,并与已发表的正常中国人中耳解剖结构的测量数据比较验证其结果的几何相似性和可靠性。结果重建了包含鼓膜、听骨、韧带、肌肉的中耳三维有限元模型。从测量中耳实体模型大小以及质量属性两方面的数据证实了此中耳三维有限元模型能良好的模拟正常人体中耳鼓室形态结构,具有良好的几何相似性。结论应用本方法建立的正常人中耳腔三维有限元模型形态逼真,几何相似性好,为进一步的从声学、生物动力学方面测试此模型在不同频率特定声压作用下鼓膜及镫骨的振动反应、中耳传音结构的几何形态及负荷改变奠定了形态学基础。
Objective To establish a three - dimensional finite element model of the middle ear based on the data of temporal bone tissue of healthy human body in China. The geometric dimensions of each component of the middle ear cavity were analyzed. The quality attributes of each ossicular bone were calculated by using the software. Methods According to the data of normal human temporal bone tissue sections provided by the Institute of Otolaryngology and General Surgery of People’s Liberation Army General Hospital, three-dimensional solid models of the middle ear were established by using AutoCAD2005 and UG software. The three-dimensional solid models of the middle ear were performed by using ADINA finite element software Mesh Based on the literature data of middle ear anatomy, acoustics and biomechanics, the model was subjected to physiological loading and boundary constraints, and a three-dimensional finite element model of the middle ear containing the tympanic membrane, the bones, ligaments and muscles was established. Finally, the software-based functions were used to measure the size and quality attributes of the middle ear solid model. The geometric similarity and reliability of the results were verified by comparison with published measurements of the anatomical structures of the middle ear in normal Chinese. Results The three-dimensional finite element model of the middle ear, including the tympanic membrane, the bones, ligaments and muscles, was reconstructed. From the measurement of the size of the middle ear solid model and the qualitative data, it is confirmed that the three-dimensional finite element model of the middle ear can well simulate the shape and structure of the middle ear tympanic cavity of a normal human body and has good geometric similarity. Conclusion The three-dimensional finite element model of normal human middle ear cavity established by this method is vivid and has good geometric similarity. To further investigate the acoustic and biodynamic aspects of the model, the vibration of the tympanic membrane and tarsal bone under specific sound pressure at different frequencies Response, middle ear acoustic structure of the geometry and load changes laid the foundation for morphology.