人耳鼓膜置管数值分析

NUMERICAL ANALYSIS FOR TYMPANOSTOMY TUBE IN HUMAN EAR

鼓膜置管是治疗分泌性中耳炎改善听力的有效方法.置管后听力系统的生物力学特性并没有很全面的研究.建立了包括外耳道、鼓膜、鼓膜置管、听骨链、中耳韧带/肌肉以及内耳液体在内的有限元模型,真实完整地再现了其复杂结构及边界约束.利用人耳有限元数值模型研究了鼓膜置管对鼓膜及镫骨底板振动的影响,分析了置管自身振动情况.用数值方法解释了鼓膜置管对传声的影响,为中耳炎治疗及鼓膜置管设计提供了力学参考.

Tympanostomy tube is an effective treatment for secretory otitis media. There have been very few analyses of the biomechanical behavior of the ventilation tube. In this paper, a three-dimensional finite element model of the human ear is established, including the external ear canal, tympanic membrane, tympanostomy tube, ossicular bones, middle ear suspensory ligaments/ muscles, and inner ear fluid, which can describe the complicated structures and boundary conditions. The finite element model is used to analyze the displacement change of tympanic membrane and stapes footplate. At the same time, it is found that the presence of tym- panostomy tube sigliificantly affects the displacement vibration of the tube. The effect of tympanostomy tube on sound transmission is explained based on numerical method. The results may be useful to the therapy of secretory otitis media and the design of ventilation tube.