肛管直肠环肌群有限元模型应力分析  

Investigation on Mechanical Property of Anorectal Ring Muscles and Finite Element Simulation for Contractility

作　　者：权隆芳[1] 李宇飞[2] 孙杰[3] 贝绍生 QUAN Long-fang;LI Yu-fei;SUN Jie(Department of Anorectal Surgery,China Academy of Chinese Medical Sciences Xiyuan Hospital,Beijing(100091),China)

机构地区：[1]中国中医科学院西苑医院肛肠科,北京100091 [2]中国中医科学院广安门医院肛肠科,北京100053 [3]山东大学机械工程学院,山东250061

出　　处：《中国中西医结合外科杂志》2022年第4期538-542,共5页Chinese Journal of Surgery of Integrated Traditional and Western Medicine

基　　金：中国中医科学院科技创新工程重大攻关项目(CI2021A01901);国家自然基金资助项目(81373651)。

摘　　要：目的:从力学角度应用试验与仿真相结合对肛管直肠环进行有效预测评估与量化评判。方法:提取直肠癌术后组织标本获得肛管直肠环样本,进行静态拉伸试验,获得肛管直肠环肌群的应力-应变曲线;采用逆向工程的方法将使用MR扫描得到的盆底肛提肌、肛门扩约肌复合体转换为可导入仿真软件的三维几何模型;再使用ABAQUS有限元仿真软件进行仿真分析,模拟肛管直肠环肌群在不同排便条件下所承受的应力情况。结果:采用不同直径的圆柱作用于肛管直肠环,可以有效地模仿人静息状态、强忍状态,力排初状态以及增大腹压的各种活动状态如喷嚏、咳嗽、负重活动。结论:肛管直肠环有限元模型的建立为有效地模拟肛门不同手术方式导致的肛门控便功能障碍研究提供了有效真实的平台。Objective From the perspective of mechanics,the combination of test and simulation is used to effectively predict and evaluate the anorectal ring and quantitatively evaluate it.Methods The anorectal ring sample is got for the static tensile test and the stress-strain curve of anorectal ring muscle is acquired.Complex of pelvic floor and anal sphincter is got by CT scanning.Then the complex is converted to 3D geometry model which can be used by the simulation software through reverse engineering method.At last,the stresses of anorectal ring muscles under different conditions are got based on finite element simulation by using ABAQUS.Results The cylinders of different diameters were used to act on the anal rectal ring,which can effectively imitate the human resting state,endurance state,force discharge state and various active states of increasing abdominal pressure,such as sneezing,cough and weight-bearing activities.Conclusion The establishment of the finite element model of anal rectal ring provides an effective and real platform for the study of anal defecation dysfunction due to different surgical methods of anal fistula.

关 键 词：肛管直肠环肌群 肛瘘 应力 仿真 试验 

分 类 号：R602[医药卫生—外科学]