基于有限元仿真的颅脑摔跌伤成伤机制分析OACHSSCD

Objective To use finite element methods to conduct a digital simulation of a craniocerebral injury death case in which the manner of injury was questionable.Based on biomechanical data,the injury mechanism of the deceased's brain injury was quantitatively analyzed to provide a quantitative and visual objective basis for determining the manner of injury.Methods The THUMS 4.02 human fi-nite element model was used to simulate the process of skull and brain tissue injury when the occipital re-gion fell and struck flat ground,with impact velocities of 4.18,5.00,5.50 and 6.00 m/s.Combined with the actual autopsy results,the injury mechanism was analyzed based on injury patterns and tissue stress characteristics.Results When the human body fell freely without external force(4.18 m/s)and landed on the occipital region,it caused minor fractures of the occipital bone and mild brain tissue injury;when the body was pushed to the ground by external forces(5.00,5.50 and 6.00 m/s),the fracture range of the skull extended to the skull base,causing moderate brain tissue injury.Based on the actual injury findings,the possibility that the deceased fell freely can be ruled out.Conclusion Reconstructing the process of traumatic brain injury using the finite element method can provide new ideas for deter-mining the mechanism of injury in complex forensic cases through biomechanical indicators.