颅骨厚度对颅内生物力学响应的影响

目的通过有限元方法研究颅骨厚度对颅内力学参数的影响。方法选取第5百分位女性头部进行CT扫描,构建生物仿真度较高的头部有限元模型,通过重构尸体试验验证所建模型。建立不同颅骨厚度的头部有限元模型,进行多组试验,对比颅内各项力学参数。结果相同头部尺寸下,随着颅骨厚度减小,颅内压负值受到影响较大,呈现下降趋势;颅内压正值受到影响较小,但是呈现上升趋势。脑组织剪切力、von Mises应力会相对增大,且增长幅度较大。结论相同头部尺寸下,颅骨厚度在一定程度上会影响头部损伤,颅骨厚度小的人相较颅骨厚度大的人更容易受伤。

The Influence of Skull Thickness on Intracranial Biomechanical Response

Objective To study the influence of skull thickness on intracranial biomechanical parameters by finite element method. Methods The female head at 5th percentile was selected for CT scanning to construct finite element model of the head with high biofidelity,and the model was verified by reconstructed cadaver test. The finite element model of the head with different skull thickness was established, and multiple groups of tests were carried out to compare the intracranial mechanical parameters. Results The negative value of intracranial pressure was significantly affected by the decrease in skull thickness under the same head size, while the negative value of intracranial pressure was slightly affected, with an increasing trend. The shear stress and von Mises stress of brain tissues were significantly increased with skull thickness increasing. Conclusions Under the same head size, the skull thickness will affect head injury to a certain extent, and people with small skull thickness are more likely to be injured than those with large skull thickness.