Zhang Ruining, Zhao Yu, Liu Houguang, Yang Jianhua, Zhou Lei, Huang Xinsheng, Yang Shanguo
School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P.R.China.
Department of Otorhinolaryngology, Zhongshan Hospital Affiliated to Fudan University, Shanghai 200032, P.R.China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2021 Feb 25;38(1):89-96. doi: 10.7507/1001-5515.202002051.
In order to study the effect of middle ear malformations on energy absorbance, we constructed a mechanical model that can simulate the energy absorbance of the human ear based on our previous human ear finite element model. The validation of this model was confirmed by two sets of experimental data. Based on this model, three common types of middle ear malformations, . . incudostapedial joint defect, incus fixation and malleus fixation, and stapes fixation, were simulated by changing the structure and material properties of the corresponding tissue. Then, the effect of these three common types of middle ear malformations on energy absorbance was investigated by comparing the corresponding energy absorbance. The results showed that the incudostapedial joint defect significantly increased the energy absorbance near 1 000 Hz. The incus fixation and malleus fixation dramatically reduced the energy absorbance in the low frequency, which made the energy absorbance less than 10% at frequencies lower than 1 000 Hz. At the same time, the peak of energy absorbance shifted to the higher frequency. These two kinds of middle ear malformations had obvious characteristics in the wideband acoustic immittance test. In contrast, the stapes fixation only reduced the energy absorbance in the low frequency and increased energy absorbance in the middle frequency slightly, which had no obvious characteristic in the wideband acoustic immittance test. These results provide a theoretical reference for the wideband acoustic immittance diagnosis of middle ear malformations in clinic.
为了研究中耳畸形对能量吸收的影响，我们基于之前的人耳有限元模型构建了一个能够模拟人耳能量吸收的力学模型。该模型的有效性通过两组实验数据得到了证实。基于此模型，通过改变相应组织的结构和材料属性，模拟了三种常见的中耳畸形，即砧镫关节缺损、砧骨固定和锤骨固定以及镫骨固定。然后，通过比较相应的能量吸收情况，研究了这三种常见中耳畸形对能量吸收的影响。结果表明，砧镫关节缺损显著增加了1000Hz附近的能量吸收。砧骨固定和锤骨固定在低频时显著降低了能量吸收，使得在低于1000Hz的频率下能量吸收小于10%。同时，能量吸收峰值向更高频率偏移。这两种中耳畸形在宽带声导抗测试中具有明显特征。相比之下，镫骨固定仅在低频降低了能量吸收，在中频略有增加，在宽带声导抗测试中没有明显特征。这些结果为临床中耳畸形的宽带声导抗诊断提供了理论参考。
