新型颧弓骨折内固定器的模拟设计及生物力学研究

目的:利用计算机模拟设计一种新型颧弓骨折内固定器,并通过有限元方法对其固定效果进行生物力学分析。方法:利用螺旋CT扫描图像,在Mimics软件中进行颧弓的三维重建,Geomagic软件完成曲面重构,在UG NX5.0中设计新型内固定器并建立颧弓骨折内固定的三维有限元模型,沿X轴正向,对模型外侧进行集中力加载,大小分为10N、30N、60N、90N、120N、150N六个级别,记录分析该有限元模型在不同工况下的应力及位移情况。结果:成功模拟设计出一种新型颧弓骨折内固定器,建立颧弓骨折内固定三维有限元模型,单元数52977,节点数87116。模型应力主要分布在固定器上,模型最大位移部位位于中间骨折段下端,固定器稳定可靠,能提供有效的支撑作用,防止颧弓再移位。结论:模拟的颧弓骨折内固定器固定效果满意,为今后该固定器的设计提供建模基础并对其可行性进行初步验证。

Design and biomechanical analysis of new type internal fixation of the zygomatic arch fracture

Objective： To establish a new type internal fixation for zygomatic arch fracture and perform biomechanical analysis of its stability with finite element method. Methods： The zygomatic arch data scanned by Spiral-CT was used to establish 3D model by Mimics. Then the NURBS surface was re-constructed with the soft of Geomagic. The new type fixation device and internal fixation of zygomatic arch 3D finite element model were obtained by the use of UG NX5.0 software. Different forces（10N, 30N, 60N, 90N, 120N, 150N） were applied to the zygomatic model. The stress distribution and displacement were recorded and analyzed. Results： The new type fixation device was established and the 3D finite element model consisted of 52977 elements and 87116 nodes. The maximum stress was focus on the fixation device. The maximum displacement was at the bottom of mid-bone. The fixation device could provide reliable fixation and prevent the immobi- lized zygomatic arch from displacement efficiently. Conclusions： The result of the biomechanical analysis about the stability of the new type fixation device was satisfied. It might provide an effective and feasible foundation for further research.