Research On Modeling Technology Of Bionic Micropore Hip-joint Prosthesis

The hip joint is one of the most important joints of the human body and has a high flexibility,bearing most of the body weight.There are a large number of precise microscopic pore structures inside the joint bone.Appropriate porosity,adhesion area and connectivity of the hip joint provide a favorable environment for the stress transfer of bone loads,the growth of cells and tissues,the transmission of nutrients and metabolism.This overall excellent structure and local microscopic features of the hip joint have long been a hot spot in the artificial hip joint bionic design,and have important research and engineering application value.Therefore,this paper will conduct an in-depth study on the bionic design of artificial hip joints.The main research work is as follows:?1?In view of the complex internal structure of natural bones and the existence of a large number of pores,this paper proposes a microporous structure bionic design method based on Voronoi diagram algorithm.First of all,the algorithm for constructing the seed point of Voronoi diagram is studied.Secondly,the generation of micropore structure is studied,and the mesh of micropore structure is constructed by topological stitching.Then,the structure mesh is optimized by subdivision algorithm.The quality of shape is improved by contour interface optimization method.Finally,we discusse the method of realizing the gradient distribution of the pore beam thickness in space and the method of generating the micropore unit.The method simplifies the design flow of the microporous structure and improves the freedom of structural design.?2?Taking the number of seed points,the gradient coefficient and the thickness of the orifice beam as input parameters,we study the strcture performance and geometric parameter controllability of regular and irregular microporous structures constructed for Voronoi diagram algorithm.The results show that the thickness of the pore beam has the greatest influence on the porosity of the microporous structure,and they are negatively correlated;the pore size is most affected by the number of seed points,the more the number of points,the smaller the pore size;irregular micropore structure is significantly higher than regular micropore structure in connectivity and diversity;the uniformity is directly related to the gradient coefficient of the pore;the specific surface area is affected by the pore beam thickness,which is not strongly correlated with the number of seed points.In structure performances,the C₁/2EC unit performs best in the regular micropore structure.In the irregular micropore structure,the number of seed points,the gradient coefficient and the pore beam thickness have a great influence on the permeability and modulus ratio of the structure.?3?Aiming at the modeling design and application of hip prosthesis,we propose a micropore filling design based on topology optimization.The microporous structure is designed with reference to the CT picture of the individual patient,which well restored the original cancellous bone in the pore distribution and shape and has a high biomimetic property.The finite element analysis method was used to simulate the stress shield effect of the prosthesis implanted in the human body.The results show that the prosthesis with optimized filling design has the best performance.?4?Based on the VS2013 development platform,we developed a software module for parameterized micropore modeling.It reduced the design flow of micropore modeling,and expanded the freedom of micropore modeling.The microporous structure designed by the software module can meet the expected requirements in the bionic design,and the structure of the trabecular bone can be designed.