Islam Md Monirul, Wang Xiaodu
Department of Mechanical Engineering, University of Texas at San Antonio, USA.
Biomed Mater Eng. 2017;28(2):201-211. doi: 10.3233/BME-171667.
Coring is a surgical procedure in bone biopsy retrieval and dental/orthopaedic procedures, which may cause thermal damage to bone tissues adjacent to the coring zone. This study was performed to determine the temperature rise in bone by coring using a semi-empirical thermocouple approach. Concurrently, a custom-made dynamometer was used to measure the cutting and thrust forces during coring bovine cortical bone samples. The experimental results indicated that the cutting force, cutting speed, and depth of cut significantly affect the temperature rise in the cutting zone during coring process. In addition, acute temperature rises in the cutting zone occurred when the cutting speed exceeded threshold levels. The limited capacity of heat dissipation during coring is most likely responsible for such a sharp temperature rise with increasing cutting speed. Moreover, it was observed that the maximum size of potential thermal damage zone could reach to 3.0 mm in depth from the surface of the coring hole, assuming that thermal damage would occur when the temperature is greater than 47°C. Thus, proper cutting conditions need to be selected to avoid the potential thermal damage to bone during the coring procedures.
钻取是骨活检取材以及牙科/骨科手术中的一种外科操作，它可能会对钻取区域附近的骨组织造成热损伤。本研究采用半经验热电偶方法来测定钻取过程中骨内的温度升高情况。同时，使用定制的测力计来测量钻取牛皮质骨样本时的切削力和推力。实验结果表明，切削力、切削速度和切削深度在钻取过程中对切削区域的温度升高有显著影响。此外，当切削速度超过阈值水平时，切削区域会出现急剧的温度升高。钻取过程中散热能力有限很可能是导致随着切削速度增加温度急剧升高的原因。而且，观察到假设温度高于47°C时会发生热损伤，潜在热损伤区域的最大深度从钻取孔表面可达3.0毫米。因此，在钻取过程中需要选择合适的切削条件以避免对骨造成潜在的热损伤。
