北京生物医学工程2025，Vol.44Issue(1)：9-15,38,8.DOI:10.3969/j.issn.1002-3208.2025.01.002
白内障手术连续环形撕囊有限元仿真分析
Finite element simulation analysis of continuous circular capsulorhexis in cataract surgery
摘要
Abstract
Objective In order to achieve precise operation of continuous circular capsulorhexis(CCC),the finite element analysis(FEA)is used to explore the tear force and anterior capsule deformation during CCC.Methods Firstly,based on the existing clinical physical and morphological data of the lens,a model of continuous circular capsulorhexis was constructed.The damage of the anterior capsule itself and the adjacent tissue between capsule and cortex were simulated by using the distortion energy failure criterion and cohesive model failure criterion,respectively.Then,by constructing a spherical coordinate system to describe the parameters of tearing,the mechanical behavior of tissue was analyzed,and tear force curve was obtained.Results When the capsulorhexis angle θ,=90°,θ2=30°,the maximum and mean tear force were 19.22 mN and 11.74 mN,respectively.The capsulorhexis force is in good agreement with the experimental data described in literature.The effect of velocity on the mean tearing force is first increased and then decreased,and with the increase of failure stress,the mean tearing force gradually increased.The whole process of capsulorhexis can well reflect the tear force and the deformation of the capsule,and the average force of five tearing steps were 11.74 mN,9.70mN,12.44mN,11.01mN and 9.75mN,respectively.Conclusions In the process of capsulorhexis,the capsule and the cortex are destroyed first,and then the anterior capsule itself is broken.The tear force is mainly caused by the crack propagation of the anterior capsule,and the speed leads to the average tear force first increases and then decreases.At the same time,the increase of failure stress will also cause the increase of tear force.For the entire capsulorhexis process,the tear force after each reversal can remain stable.The finite element model constructed in our paper can simulate the CCC operation.关键词
连续环形撕囊/有限元模型/前囊膜/撕囊力/力学行为Key words
continuous circular capsulorhexis/finite element model/anterior capsule of lens/tear force/mechanical behavior分类
医药卫生引用本文复制引用
韩少峰,李志朝,卢铭锋,裴雅婧,杨洋,马科..白内障手术连续环形撕囊有限元仿真分析[J].北京生物医学工程,2025,44(1):9-15,38,8.基金项目
国家自然科学基金青年科学基金(12202144)、中央高校基本科研业务费(2022MS008)资助 （12202144）
