Three-dimensional finite element analysis of the human middle ear and an application for clinics for tympanoplasty
Three-dimensional finite element analysis of the human middle ear and an application for clinics for tympanoplasty
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人体中耳三维有限元分析及鼓室成形术临床应用
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Toriya
中科院分区：
文献类型：
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作者：
T. Higashimachi;Y. Shiratake;T. Maeda;K. Sug;R. Toriya
利用SolidWorks软件建立了包括鼓膜、鼓室、听小骨、多个韧带和张肌在内的中耳周围的几何模型。听小骨由锤骨、砧骨和砧骨组成。将中耳周围的CT扫描数据转换为医学数字成像与通信(DICOM)数据，再转换为STL数据。该STL数据被导入到SolidWorks中以生成几何模型。利用COSMOSWorks软件对该模型进行了三维有限元分析。然后，分析了声压对中耳的力学影响。明确了在120分贝的声压作用下，中耳的变形情况和距骨的移位情况。距骨底部沿轴线方向的位移约为3.1纳米，成为听力评价的标准值。在内耳中，砧骨的振动被传递到耳蜗迷路液体中，在那里产生电信号。最后，它在大脑中被识别为声音。例如，在用医疗设备替代有缺陷的听骨的情况下，可以通过比较距骨移位的程度来估计听力。这种方法为传导性听力损失的恢复提供了一种新的治疗方法。
The geometric model around the middle ear which includes the tympanic membrane, tympanic cavity, auditory ossicles, several ligaments, and tensor was constructed using SolidWorks. The auditory ossicles consist of malleus, incus and stapes. The computerized tomography (CT) scan data around the middle ear was converted into DICOM (Digital Imaging and Communication in Medicine) data, then into STL data. This STL data was imported to SolidWorks in order to generate the geometric model. The sound pressure through the tympanic membrane was applied to this model in a three-dimensional finite element analysis using COSMOSWorks. Then, the mechanical influence of the sound pressure upon the middle ear was analyzed. The deformation of the middle ear and the displacement of the stapes under the sound pressure of 120 dB were clarified. The displacement of the bottom of the stapes in the direction of the axis is about 3.1 nanometers which becomes a standard value of the hearing ability evaluation. In the internal ear, the stapes vibration is transmitted to the labyrinthine fluid in the cochlea where electrical signals are generated. Finally, it is recognized in the brain as sound. For example, in the case that the medical device is substituted for the deficient auditory ossicles, it is possible to estimate hearing ability by comparing to what degree the displacement of stapes changes. This kind of approach makes it possible to propose a new medical treatment for the recovery of conductive hearing loss.