Analysis of Head Injuries using Finite Element Method and Its Application to Medico-legal Testimony

1)颅脑有限元模型的建立：为了研究颅脑在撞击力作用下各点的变形和剪应变分布，我们采用有限元方法建立了颅脑的计算机仿真模型。2）颅脑撞击伤致死病例的研究，跌倒和跌倒。在打击中，头部的外侧区域经常受到撞击，福尔斯跌倒时撞击后部区域，几乎所有福尔斯跌倒的病例都撞击后部区域。在头外侧区撞击中，撞击损伤比对冲损伤更常见、更严重（88.9%），对冲损伤在福尔斯跌倒中占80.0%，几乎所有跌倒都只有对冲损伤。在额叶撞击中，所有撞击病例均为撞击损伤，福尔斯撞击中72.7%的撞击损伤为撞击损伤，其中27.3%的撞击损伤位于枕叶。在后撞击的情况下，在所有的撞击病例中，撞击损伤更频繁和更严重，在福尔斯的所有病例中，对冲损伤占93.3%，并且几乎所有的跌倒病例中只有对冲损伤。在打击和福尔斯中经常观察到凹陷或粉碎性骨折，在福尔斯中经常观察到线性骨折。

1)Finite Element Model of a Human Brain and Skull.To investigate the deformations and shear strain distributions at the each point of the brain and skull in the human head which incurred an impact force, we made up a computer simulation model of the human brain and skull using the Finite Element Method.2)Studies on Head Injuries in the Fatal Cases by Blow, Fall and Fall Down.In blows a lateral region of the head was frequently impacted, a posterior region was done in falls and a posterior region was done in the almost all cases of falls down. With the impact to the lateral region of the head, the coup lesions were more frequent and more severe than the contrecoup lesions in 88.9% of all cases in blows, the contrecoup lesions were in 80.0% in falls and there were merely the contrecoup lesions in almost all cases of the fall down. With frontal impacts, there were merely the coup lesions in all cases of the blow and there were merely the coup lesions in 72.7% in falls, especially in 27.3% the contrecoup lesions were found in the occipital lobes. With posterior impacts, the coup lesions were more frequent and more severe in all cases of the blow, the contrecoup lesions were in 93.3% of all cases in falls and there were merely the contrecoup lesions in almost all cases of the fall down. Depressed or comminuted fractures were often observed in blows and falls, and linear fractures were in falls down.