【摘要】 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。更多还原

【Abstract】 Objective To study the effects of the size and diffraction of tympanic membrane perforation on hearing system of human ear.Method The whole temporal bone from a healthy volunteer is scanned using spiral CT.The digitized outlines of images are imported into ANSYS to construct a three dimensional finite element model of the human ear.Results The resonance frequencies become 3.6,4.4 and 4.6 kHz with the increase of perforation areas as 0.97,3.66 and 7.97 mm2,respectively.The larger perforation in the tympanic membrane results in a lower stapes footplate displacement.The displacement swing of the stapes footplate decreased clearly under the action of sound wave from the diffraction.The peak values of the displacement nephogram of the tympanic membrane are 0.32,0.20 and 0.19 μm at 1000 Hz,respectively.At the resonance frequency,the peak values of the displacement nephogram of the tympanic membrane are 0.20,0.14 and 0.09 μm,respectively.Conclusions The larger the size of the perforation is,the smaller stapes footplate displacement will be,especially at the lower frequency of 4 kHz with the higher resonance frequency.The peak values of displacement nephogram will become smaller with the increased size of perforations.The results would give helpful information for the clinical treatment.更多还原