颅骨-脑相对位移的有限元模拟  

Finite element model of skull-brain relative displacement

作　　者：何黎民[1] 卢亦成[2] 吴建国[3] 刘平[2] 丁祖泉[3] 陈学强[3] 王保华[3] 

机构地区：[1]中国人民解放军广州军区广州总医院神经外科,广东广州510010 [2]中国人民解放军第二军医大学长征医院神经外科,上海200003 [3]上海同济大学生命科学与医学工程研究院,上海200031

出　　处：《中国微侵袭神经外科杂志》2005年第6期263-265,共3页Chinese Journal of Minimally Invasive Neurosurgery

基　　金：上海市科技发展基金项目(014119099)

摘　　要：目的研究实现颅骨-脑相对位移的有限元模拟。方法筛选硬膜脑相邻节点,在节点之间增设弹簧单元,模拟硬膜下腔,对模型加载冲击载荷,计算分析硬膜、脑对应节点的相对位移。观察模拟颅骨-脑相对位移前后脑表面应力改变的范围及大小。结果采用弹簧单元模拟硬膜下腔后,硬膜与脑对应节点出现相对位移,在冲击载荷下,脑表面应力改变范围向颅底移动,颅底脑表面应力峰值升高。结论有关颅骨-硬膜与软-蛛网膜-脑复合体之间的弹性接触问题,可通过使用弹簧单元模拟硬膜下腔的方法实现对颅骨-脑相对位移的有限元模拟。模拟后脑组织对冲击载荷的应力改变更符合临床脑损伤情况。Objective To simulate skull-brain relative displacement due to head impact in three-dimensional finite element model. Methods Two-dimensional springs were placed between the nearby nodes of the dura and brain to model the subdural space. The skull-brain relative displacements were analyzed after impact load onto the model and the variation range of brain surface stress were observed. Results The relative displacement between skull and brain in subdural space was found in simulating frontal impact. The range of brain surface stress change ranged to the brain base, which caused rise of the peak value of the stress in the brain base. Conclusion The finite element method can be used to stimulate the skull-brain relative displacement in the subdural space. The variation range of brain surface stress agreed more with the clinical situation of brain injury by the impact load in this model.

关 键 词：模型 神经学 颅脑损伤 有限元分析 生物力学 

分 类 号：R651[医药卫生—外科学]