Amewoui Foli, Le Coz Gaël, Bonnet Anne-Sophie, Moufki Abdelhadi
Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux, LEM3 Université de Lorraine, CNRS, Arts et Métiers Paris Tech, LEM3, F-57000 Metz, France.
Med Eng Phys. 2020 Oct;84:151-160. doi: 10.1016/j.medengphy.2020.07.007. Epub 2020 Jul 18.
Predicting the bone thermal response in a surgical operation remains a major challenge. In the previous works, metal machining theory has frequently been used to predict bone temperature in drilling process. However, several experimental studies demonstrate that the chip formation process is very complex compared to metal cutting. In the present study, a simplified analytical model based on the moving heat source approach combined with the method of image sources is developed. The heat source due to the drill-bit tip was supposed to be proportional to the cutting energy. The friction at the tool-hole contact was also considered. An experimental study was performed on fresh femur pig bone for cutting speeds from 2 to 20 m/min. Temperature rise, drilling forces and bone volume fraction were measured. The experimental validation showed that the model reproduces satisfactorily the increase in temperature up to the maximum value while it overestimates the temperature during the cooling stage. A parametric study (thermal boundary conditions, lateral friction) was also performed. From the predicted results, it appears that the model can be improved by considering the effects of the bone volume fraction which can present a significant variation in the bone sample.
预测外科手术中的骨热响应仍然是一项重大挑战。在以往的研究中，金属加工理论经常被用于预测钻孔过程中的骨温度。然而，多项实验研究表明，与金属切削相比，切屑形成过程非常复杂。在本研究中，基于移动热源方法并结合镜像法开发了一个简化的分析模型。假定钻头尖端产生的热源与切削能量成正比。还考虑了刀具与孔接触处的摩擦力。对新鲜猪股骨进行了切削速度为2至20米/分钟的实验研究。测量了温度升高、钻孔力和骨体积分数。实验验证表明，该模型能令人满意地再现温度升高直至最大值的情况，但在冷却阶段高估了温度。还进行了参数研究（热边界条件、侧向摩擦）。从预测结果来看，似乎可以通过考虑骨体积分数的影响来改进该模型，因为骨体积分数在骨样本中可能会有显著变化。
