Migueis G F J, Fernandes F A O, Ptak M, Ratajczak M, Alves de Sousa R J
TEMA: Center of Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, Portugal.
Wroclaw University of Science and Technology, Faculty of Mechanical Engineering, Lukasiewicza 7/9, Wroclaw 50-371, Poland.
Clin Biomech (Bristol). 2019 Mar;63:104-111. doi: 10.1016/j.clinbiomech.2019.02.010. Epub 2019 Mar 1.
One of the most severe traumatic brain injuries, the subdural haematoma, is related to damage and rupture of the bridging veins, generating an abnormal collection of blood between the dura mater and arachnoid mater. Current numerical models of these vessels rely on very simple geometries and material laws, limiting its accuracy and bio-fidelity.
In this work, departing from an existing human head numerical model, a realistic geometry for the bridging veins was developed, devoting special attention to the finite elements type employed. A novel and adequate constitutive model including damage behavior was also successfully implemented.
Results attest that vessel tearing onset was correctly captured, after comparison against experiments on cadavers.
Doing so, the model allow to precisely predict the individual influence of kinematic parameters such as the pulse duration, linear and rotational accelerations in promoting vessel tearing.
最严重的创伤性脑损伤之一——硬膜下血肿，与桥静脉的损伤和破裂有关，导致硬脑膜和蛛网膜之间出现异常积血。目前这些血管的数值模型依赖于非常简单的几何形状和材料定律，限制了其准确性和生物逼真度。
在这项工作中，从现有的人体头部数值模型出发，开发了桥静脉的真实几何形状，并特别关注所采用的有限元类型。还成功实施了一种包括损伤行为的新颖且合适的本构模型。
与尸体实验进行比较后，结果证明血管撕裂的起始被正确捕捉到。
这样一来，该模型能够精确预测诸如脉冲持续时间、线性和旋转加速度等运动学参数在促进血管撕裂方面的个体影响。
