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首页> 外文期刊>Acta biomaterialia >Multiaxial mechanical properties and constitutive modeling of human adipose tissue: A basis for preoperative simulations in plastic and reconstructive surgery
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Multiaxial mechanical properties and constitutive modeling of human adipose tissue: A basis for preoperative simulations in plastic and reconstructive surgery

机译：人体脂肪组织的多轴力学特性和本构模型：整形和重建手术术前模拟的基础

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摘要

A preoperative simulation of soft tissue deformations during plastic and reconstructive surgery is desirable to support the surgeon's planning and to improve surgical outcomes. The current development of constitutive adipose tissue models, for the implementation in multilayer computational frameworks for the simulation of human soft tissue deformations, has proved difficult because knowledge of the required mechanical parameters of fat tissue is limited. Therefore, for the first time, human abdominal adipose tissues were mechanically investigated by biaxial tensile and triaxial shear tests. The results of this study suggest that human abdominal adipose tissues under quasi-static and dynamic multiaxial loadings can be characterized as a nonlinear, anisotropic and viscoelastic soft biological material. The nonlinear and anisotropic features are consequences of the material's collagenous microstructure. The aligned collagenous septa observed in histological investigations causes the anisotropy of the tissue. A hyperelastic model used in this study was appropriate to represent the quasi-static multiaxial mechanical behavior of fat tissue. The constitutive parameters are intended to serve as a basis for soft tissue simulations using the finite element method, which is an apparent method for obtaining promising results in the field of plastic and reconstructive surgery.
机译：为了支持外科医生的计划并改善手术效果，需要对整形和重建手术期间的软组织变形进行术前模拟。由于在脂肪组织所需的机械参数方面的知识有限，因此难以在多层计算框架中实施以模拟人类软组织变形的本构脂肪组织模型的当前开发。因此，首次通过双轴拉伸和三轴剪切试验对人体腹部脂肪组织进行了机械研究。这项研究的结果表明，在准静态和动态多轴载荷下的人类腹部脂肪组织可以表征为非线性，各向异性和粘弹性的软生物材料。非线性和各向异性特征是材料胶原微结构的结果。在组织学研究中观察到的对齐的胶原隔膜会引起组织的各向异性。本研究中使用的超弹性模型适合于表示脂肪组织的准静态多轴力学行为。本构参数旨在用作使用有限元方法进行软组织模拟的基础，这是在整形外科和重建外科领域获得有希望的结果的一种明显方法。

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