Shu Liming, Sugita Naohiko, Oshima Masaya, Mitsuishi Mamoru
Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Department of Mechanical Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Med Eng Phys. 2018 Apr;54:22-31. doi: 10.1016/j.medengphy.2018.02.005. Epub 2018 Feb 20.
Orthopedic oscillating saws (OOSs) are widely used for plane processing in orthopedic surgery such as knee and hip replacement. However, sawing has been associated with bone breakthrough and necrosis problems. In this paper, a novel elliptical vibration assisted OOS was designed to achieve a low cutting force under the condition of deepening cut depth and reducing cutting speed, based on the analysis of brittle fractures of the bone and elliptical vibration assisted cutting kinematics. The elliptical vibration was generated using two parallel stacked piezoelectric actuators assembled with the fixture. In order to reduce the large cutting forces due to the large cutting depth, a series of experiments was also conducted to investigate the influence of processing parameters on cutting forces. It was demonstrated that cutting forces are significantly reduced by increasing the vibration frequency and vibration amplitude, and decreasing the sawing speed in the current design. The new design could minimize the cutting forces during sawing and allow surgeons to have better control over the sawing process.
骨科摆动锯（OOSs）广泛应用于骨科手术中的平面处理，如膝关节和髋关节置换手术。然而，锯切一直存在骨穿透和坏死问题。本文基于对骨脆性骨折和椭圆振动辅助切削运动学的分析，设计了一种新型椭圆振动辅助骨科摆动锯，旨在在增加切削深度和降低切削速度的条件下实现低切削力。椭圆振动由两个与夹具组装在一起的平行堆叠压电致动器产生。为了减少由于切削深度大而产生的巨大切削力，还进行了一系列实验来研究加工参数对切削力的影响。结果表明，在当前设计中，通过提高振动频率和振幅以及降低锯切速度，切削力显著降低。新设计可以在锯切过程中最小化切削力，并使外科医生能够更好地控制锯切过程。
