腹腔镜抓钳的力学性能

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.