Constitutive laws for biomechanical modeling of refractive surgery
Constitutive laws for biomechanical modeling of refractive surgery
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DOI：
10.1115/1.2796033
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发表时间：
1996-11-01
影响因子：
1.7
通讯作者：
McDonnell, PJ
中科院分区：
文献类型：
--
作者：
Bryant, MR;McDonnell, PJ
使用光纤位移探针对新鲜、完整的人角膜进行膜膨胀测试以测量顶端位移。使用每个测试的有限元模型来识别通常用于模拟角膜屈光手术的四种不同本构律的材料特性。然后比较使用不同最佳拟合本构律的放射状角膜切开术的有限元模型。结果表明，角膜的响应中的非线性是材料而不是几何的，并且材料非线性对于建模屈光手术是重要的。还发现，线性横向各向同性是无法代表她的各向异性，已被实验测量的其他人，和超弹性的法律是不适合建模的角膜的硬化响应。
Membrane inflation tests were performed on fresh, intact human corneas using a fiber optic displacement probe to measure the apical displacements. Finite element models of each test were used to identify the material properties for four different constitutive laws commonly used to model corneal refractive surgery. Finite element models of radial keratotomy using the different best-fit constitutive laws were then compared. The results suggest that the nonlinearity in the response of the cornea is material rather than geometric, and that material nonlinearity is important for modeling refractive surgery. It was also found that linear transverse isotropy is incapable of representing she anisotropy that has been experimentally measured by others, and that a hyperelastic law is not suitable for modeling the stiffening response of the cornea.