适用于临床的小腿残端有限元网格自动快速划分方法

Fast Automated Finite Element Mesh Generation of Residual Lower Limb for Clinical Application.

目的为在假肢设计CAD/CAM系统中发展小腿残端三维有限元应力分析功能建立专门的有限元网格自动划分算法。方法针对小腿残端的特点 ,用标准骨替代真实骨 ,使用校准点映射法进行骨定位和配准 ,采用子域分解法自动形成网格。结果提出并实现了一种小腿残端有限元网格快速自动划分方法 ,实现了骨的自动定位和配准 ,保证了骨几何形状的完整性 ,能适宜不同个体的差异 ;网格密度可控制 ,可以满足不同计算量要求的有限元分析 ;所生成的单元都是精度较高的 5、6面体单元。结论所建立的小腿残端三维有限元网格自动划分算法可满足临床的需要 ,避免了CT、MRI等方法对患者的放射性损伤以及图像处理方面的难点 ,该方法将促进有限元分析方法在假肢设计中的临床应用 。

Objective To develop a model of fast automated mesh generation of residual lower limb for clinical application. Method Actual geometry of the bone was represented as a standard pretreated model of bone, which was auto located by employing an affine scaling transformation. Hexahedral or wedge elements were constructed by joining quadrilateral or triangular meshes generated by graph partitioning method and transport mapping method from successive planar cross sections. Result A model of fast automated mesh generation of residual lower limb was developed, which can be applied to different amputee and ensure the geometric integrality of bone. Auto location of the bone was carried out. The mesh refinement can be controlled to adapt to different computational efficiency. The generated elements are hexahedral or wedge elements, both of which are more precise than tetrahedral element. Conclusion The present method could be applied in finite element analysis method for prosthetic socket designing. Radioactive damage from those techniques such as CT or MRI to the amputee and the difficulty in image processing could be avoided.