视神经损伤反向夹持镊的力学性质分析及测量

目的　分析视神经损伤反向夹持镊的力学性质 ,探索一种简易的测量反向镊夹持力的方法。方法　根据力矩测算夹持力 :在反向镊的不同部位施加外力 ,使镊尖张开 ,测量外力的大小及作用力臂 ,计算力矩 ,根据力臂 力矩回归方程计算夹持力 ;简易测量方法 :直接测量在镊尖施加外力使其张开所需的作用力 ,即为镊子的夹持力。结果　镊子是个弹性体 ,其加载和卸载的力矩变化具有滞后性。简易测量方法可得到与根据力矩测算的夹持力接近的准确结果。结论　利用直接在镊尖施加外力使其张开的方法可简便、迅速地测量反向夹持镊的作用力

Mechanics analysis and measurement of cross-action forceps for optic nerve injury

Objective To analyse the mechanics character of cross action forceps for optic nerve injury,and investigate a facile method to measure the clip force of the forceps.Methods External forces were exerted on various locations of cross action forceps to have their jaws opened.The external force and the arm of force were quantified and the moment was calculated.The clip force was calculated according to the regression equation of arm of force and moment.The other alternative was to measure directly the external force exerting on the point of the forceps to jaws barely detached.The external force was exactly the clip force.Results A pair of forceps was an elastomer.The moment change of it on load and unload condition had a lag phenomenon.The result of simplified measurement was the same accurate as that calculated from moment.Conclusion The clip force of cross action forceps can be measured handily and promptly by exert an external force on the point of the forceps to jaws opened.