基于HyperMesh建立颅底陷入合并寰枕融合畸形的三维有限元模型  

Establishment of a three-dimensional finite element model of basilar invagination and occipitalization of atlas on Hyper Mesh

作　　者：梁韬[1] 孟春玲[1] 尹一恒[2] 刘广伟[1] 余新光[2] 

机构地区：[1]北京工商大学材料与机械工程学院,北京100048 [2]解放军总医院神经外科,北京100853

出　　处：《中国临床神经外科杂志》2016年第3期155-157,160,共4页Chinese Journal of Clinical Neurosurgery

基　　金：国家自然科学基金(81301274);中国博士后基金(2014M552653)

摘　　要：目的探讨建立颅底陷入合并寰枕融合畸形的三维有限元模型的方法。方法采集1例颅底陷入合并寰枕融合畸形患者的颅颈交界区的CT薄层扫描数据,利用Mimics软件对CT数据进行处理,生成三维几何表面模型,并导出点云;采用逆向工程软件Imageware处理点云数据,生成三维曲面;采用四面体与六面体混合分网的思路,利用HyperM esh对曲面模型先分块再分网,最后导出网格模型;将网格模型导入有限元软件Abaqus,进行韧带添加、材料赋值、接触定义、边界约束等,得到寰枕融合畸形三维有限元模型。结果建立的有限元模型包含474 162个单元和235 524个节点,外观逼真,几何相似性较好,可根据不同实验目的进行加载分析,对复杂载荷条件进行仿真计算。结论利用HyperM esh等软件的前处理功能建立的颅底陷入合并寰枕融合三维有限元模型,可为颅颈交界区畸形的生物力学研究提供基础,可为上颈椎畸形有限元模型的建立提供参考。Objective To explore how to establish a three-dimensional finite element model of basilar invagination and oecipitalization of atlas. Methods The CT data of craniovertebral junction in a typical patient with basilar invagination and oecipitalization of atlas was collected. Mimics software was used to edit CT pictures and generate the three-dimensional geometric model of atlanto-occipital fusion corpus and axis surface. Then point cloud was exported. Reverse engineering software of Imageware was used to process point cloud data and generate three-dimensional curved surface. The surface model was blocked first and then meshed by Hypermesh software. The mesh model was finally exported by the method of mix-meshing in tetrabedrons and hexahedrons. The mesh model was imported into finite element software of Abaqus. Finite element model was established by adding ligaments, assigning material, defining contact and defining boundary. Results The finite element model of basilar invagination and occipitalization of atlas contained 474,162 elements and 235,524 notes with good geometric similarity. Conclusion The three-dimensional finite element model of basilar invagination and oeeipitalization of atlas provides the basis for the research on eraniovertebral junction malformation, and it can be used for reference of establishment of finite element model in upper cervical spine malformation.

关 键 词：颅底陷入症 寰枕融合畸形 三维有限元模型 HyperM ESH 

分 类 号：R651.19[医药卫生—外科学]