开颅手术中面向低损伤制孔的钻头结构优化设计

Optimization Design of Drill Structure for Low Damage Drilling in Craniotomy

为降低颅骨钻孔过程中的钻削温度与轴向力,通过有限元仿真软件ABAQUS建立颅骨钻削模型,探究麻花钻主要几何参数(顶角、螺旋角、腹板厚度与横刃斜角)对机械损伤与热损伤的影响规律。制备可减小机械损伤与热损伤的优化钻头,进行试验。结果表明:麻花钻最优几何参数为顶角96°、螺旋角38.802°、腹板厚度0.8 mm、横刃斜角131.018°;与优化前的钻头相比,优化后的钻头具有更低的轴向力与钻削温度。

In order to reduce the drilling temperature and axial force during skull drilling,a skull drilling model was established by using finite element simulation software ABAQUS to explore the influence rules of the main geometric parameters of fried dough twist drill on mechanical damage and thermal damage,such as apex angle,spiral angle,web thickness and cross edge angle.An optimized drill bit which could reduce mechanical damage and thermal damage was prepared and tested.The results show that the optimum geometric parameters of fried dough twist drill are apex angle is 96°,helix angle is 38.802°,web thickness is 0.8 mm and cross edge oblique angle is 131.018°;compared with the original bit,by using the optimized bit,the axial force and drilling temperature are lower.