头部钝器损伤实验与仿真分析

Head blunt injury in experimental and simulation analysis

目的为了研究头部在钝器作用下的生物力学响应及损伤机理。方法利用CT图像数据和MRI图像数据对头部骨骼与内部软组织进行几何重建,然后画分网格,构建颅脑有限元模型。另一方面,对连于躯干的头部标本进行10 m/s的低速冲击,测试冲击部位接触力、顶部应变及冲击的对侧(枕部)加速度。把构建的有限元模型导入MADYMO软件进行相同条件下模拟仿真,从输出模块里输出相应部位的结果。结果仿真结果表明模型的头部接触力、顶部应变、对撞侧加速度与头部标本冲击实验测得值能较好吻合。结论建立的头部有限元模型及采用的仿真方法可满足头部钝器损伤的仿真研究需要。

Objective This study aims to investigate the head biomechanical responses and the mechanism of injury in blunt injury. Methods CT and MRI images of the human head were obtained to reconstruct the three-dimensional finite element （FE） model of the human head, including scalp, skull and the major internal soft tissues. Moreover, through a frontal impact to a cadaver head ,the contact force, the strain in the parital bone and the accceleration-time histories of the head were recorded. And then, the FE model was introduced into the biomechanical software MADYMO to simulate the aforementioned head impact. The time-history curves were created by the post processor of MADYMO. Results The model was validated against cadaver responses for blunt impact. Good correlation between the model and the cadaver responses were achieved for the force, strain and acceleration. Conclusions The FE model and the simulation method can be used for head injury mechanism in medical simulation research.