论文部分内容阅读
目的研究鼓膜穿孔尺寸及穿孔衍射对听力系统振动的影响。方法利用CT获取志愿者耳部结构临床资料,提取相关结构的边界,导入ANSYS并建立人耳结构数值有限元模型。结果穿孔面积分别为0.97、3.66和7.97mm2,随着穿孔尺寸增大,共振频率分别变为3.6、4.4和4.6kHz,镫骨底板位移振幅随之变小;镫骨底板位移振幅在衍射声波作用下明显变小;在1000Hz处,鼓膜位移云图位移最大值分别为0.32、0.20和0.19μm,在共振频率处,鼓膜位移云图位移最大值分别为0.20、0.14和0.09μm。结论鼓膜穿孔尺寸越大,镫骨底板位移振幅越小,尤其4kHz以下,共振频率升高。鼓膜云图位移振幅最大值随穿孔增大变小,有望对临床治疗提供参考。
Objective To study the effect of tympanic membrane perforation size and perforation diffraction on hearing system vibration. Methods The clinical data of the ear structures of volunteers were obtained by CT, the boundaries of related structures were extracted, ANSYS was introduced, and the numerical finite element model of human ear structure was established. Results The perforation areas were 0.97, 3.66 and 7.97 mm2, respectively. As the perforation size increased, the resonant frequencies changed to 3.6, 4.4 and 4.6 kHz, respectively. As a result, the displacement amplitude of the stapes floor became smaller. At 1000 Hz, the maximal displacement of echograph was 0.32, 0.20 and 0.19 μm, respectively. At the resonance frequency, the maximal displacement of echograph was 0.20, 0.14 and 0.09 μm, respectively. Conclusion The larger the tympanic membrane perforation size is, the smaller the displacement amplitude of the stapes floor, especially below 4 kHz, the higher the resonance frequency. The maximum amplitude of the displacement of the tympanic membrane cloud increases with the perforation increases, is expected to provide a reference for clinical treatment.