腹腔镜抓钳的力学性能

目的:利用有限元的方法分析各种腹腔镜抓钳的形貌，为腹腔镜抓钳的设计提供依据。方法:分析抓取肝脏组织时，抓钳倒圆半径、齿数、钳头面积、雕镂面积对组织-器械接触面最大等效应力的影响，并通过正交试验分析以上因素的主次要地位。结果:随着组织-器械接触面有效接触面积的增加，产生的最大等效应力及其变化率逐渐变小。4种因素的主次要地位依次为:钳头面积>齿数>倒圆半径>雕镂面积。结论:应根据需要选择最优的抓钳，防止产生过大的等效应力，损伤组织，并且应以钳头面积为主，另外3种因素为辅进行腹腔镜抓钳设计。

Mechanical properties of laparoscopic grasper

Objective To analyze the surface features of various laparoscopic graspers by finite element method and provide a basis for the design of laparoscopic graspers.Methods The effects of rounding radius,tooth number,jaw areas and fenestration areas on the maximum equivalent stress of the tissue-device contact surface while grasping the liver tissues were analyzed and the effects of the above factors were ordered by orthogonal test.Results As the effective contact area of the tissue-device contact surface increased,the maximum equivalent stress and its change rate became smaller.The effects of jaw area on the maximum equivalent stress of the tissue-device contact surface was the largest,followed by tooth number,rounding radius and fenestration area.Conclusion The optimal grasper should be selected according to the needs so as to prevent excessive equivalent stress and tissue damages.During the design of laparoscopic grasper,the jaw area should be the main consideration,and the others are supplementary consideration factors.