• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >A numerical model of capsulorhexis to assess the relevance of size and position of the rhexis on the IOL decentering and tilt
【24h】

A numerical model of capsulorhexis to assess the relevance of size and position of the rhexis on the IOL decentering and tilt

机译：胶囊的数值模型，以评估rhexis对IOL的尺寸和位置与倾斜的相关性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Finite element models of human crystalline capsular bag and zonular fibers are used to estimate the mechanical response of the capsule to the presence of a C-loop Intra-Ocular Lens (IOL) after cataract surgery, to assess the influence of capsulorhexis size, shape and location on IOL decentration and tilt. The model includes, in the anterior capsule, a hole with variable size, shape and position, which represents the rhexis obtained in a manual or laser-assisted manner. The IOL is not explicitly modelled, but its action is reproduced by means of a set of elastic ties, connecting the opposite sides of the bag and exerting the force corresponding to an expanded IOL. Numerical simulations show that IOL decentration and tilt are not related to the size of the rhexis. A decentered rhexis induces IOL decentration <40 mu m and a tilt <12 degrees; the combination of non-circular shape and decentering of the rhexis induces IOL decentration <47 mu m. While the introduction of a circular central rhexis causes an increment of the stresses in the capsule up to 100% relative to the physiological state, the combination of rhexis decentering and non-circular shape causes an additional 10% stress change. The values of IOL decentering and IOL tilt obtained from simulations are of scarce relevance in the clinical practice.
机译：利用人体晶体囊袋和带状纤维的有限元模型，评估白内障手术后囊袋对C形环人工晶状体（IOL）的机械反应，评估囊袋撕裂的大小、形状和位置对IOL偏心和倾斜的影响。该模型在前囊中包括一个大小、形状和位置可变的孔，代表通过手动或激光辅助方式获得的流变。人工晶状体没有明确建模，但其作用通过一组弹性系带再现，连接囊的相对侧，并施加与扩大人工晶状体相对应的力。数值模拟表明，人工晶体的偏心和倾斜与晶体的大小无关。偏心的晶体破裂导致IOL偏心<40μm，倾斜<12度；非圆形形状和非圆形形状的结合导致IOL偏心<47μm。虽然引入圆形中心的裂孔会导致胶囊中的应力相对于生理状态增加100%，但裂孔偏心和非圆形形状的结合会导致额外10%的应力变化。通过模拟获得的人工晶状体偏心和倾斜值在临床实践中缺乏相关性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号