Simulation of air-bag impact on an eye with transsclerally fixated posterior chamber intraocular lens using finite element analysis
Simulation of air-bag impact on an eye with transsclerally fixated posterior chamber intraocular lens using finite element analysis
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DOI：
10.1016/s0886-3350(03)00520-0
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发表时间：
2004-02-01
影响因子：
2.8
通讯作者：
Goto, S
中科院分区：
文献类型：
--
作者：
Uchio, E;Kadonosono, K;Goto, S
目的：确定后房型人工晶状体(IOL)后房型人工晶状体(IOL)眼球破裂的气囊撞击的物理力学条件。环境：在计算机上进行数值模拟研究。方法：使用有限元分析程序PAM-CRASH(Nihon ESI)在计算机上对模型人眼进行模拟。安全气囊被设置为以不同的速度撞击带有经巩膜固定的后房型人工晶状体的眼睛表面。10-1聚丙烯缝线的拉伸极限为0.16N，符合美国药典XXII的规定。结果：在最低速度20.0m/S下，10-0聚丙烯缝线不太可能断裂。以中等撞击速度(30m/S)，0.3s后，人工晶状体缝线可能断裂，角巩膜切开。缝线在最高速度(40m/S)下破裂的可能性很大，因为在撞击后，缝线上的拉力持续超过破裂力。结论：在后房型人工晶状体经巩膜固定的情况下，安全气囊高速可导致严重的眼外伤。像老年妇女这样的小个子个体患气囊眼部损伤的风险更大。对改进安全气囊的设计和展开的进一步研究对于将眼部损伤的风险降至最低具有重要意义。
Purpose: To determine the physical and mechanical conditions of an impacting air bag that would rupture an eye with a transsclerally fixated posterior chamber intraocular lens (IOL).Setting: Numerical simulation study on a computer.Methods: Simulations in a model human eye were performed with a computer using the finite element analysis program PAM-CRASH (Nihon ESI). The air bag was set to impact the surface of an eye with a transsclerally fixated posterior chamber IOL at various velocities. The tensile force limit of a 10-1 polypropylene suture was assumed to be 0.16 N, which is specified in the U.S. Pharmacopeia XXII.Results: At the lowest velocity of 20.0 m/s, 10-0 polypropylene sutures were not likely to break. Sutures fixating the IOL might break and a corneoscleral incision was likely to open after 0.3 second at the medium impacting velocity (30 m/s). Suture rupture was very likely at the highest velocity (40 m/s) since the tensile force on the sutures continuously exceeded the breaking force after the impact.Conclusions: In an eye with a transsclerally fixated posterior chamber IOL, severe ocular trauma can be caused by an air bag at high velocity. Small individuals such as elderly women are at greater risk for air-bag ocular injury. Further research on modifying air-bag design and deployment is important to minimize the risk for ocular injury.