Abstract

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Author(s):: HAN Liang1; HAN Baosan2; SONG Chengli1; YAN Shiju1; ZHANG Tao3; 4; WANG Chengyong3; 1. Engineering Research Center for Modern Minimally Invasive Device and Technology (Ministry of Education), School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine，Shanghai 200092, China; 3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510000, China; 4. Institute of Eontech New Materials Co., Ltd., Dongguan 523662, China

Keywords:: Keywords: laparoscopic grasper; liver tissue; finite element analysis

Abstract:: Abstract: 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.