Design,Manufacture And Performance Study Of Bionic Proximal Humerus Bone Plate

In this paper,aiming at reducing the stress shielding of humeral bone plate,a coupled bionic proximal humeral bone plate which can effectively reduce stress shielding is designed based on the structure of deep-sea glass sponge.The bionic proximal humerus bone plate was optimized by finite element simulation,and the bone plate and callus were manufactured combined with 3D printing technology,and the mechanical properties of the bone plate were tested and analyzed.The main work and conclusions are as follows:(1)Medical image acquisition and establishment of finite element model.The humerus and PHILOS bone plates were scanned by CT,and the three-dimensional model reconstruction of humerus and PHILOS was realized by reverse engineering modeling,model assembly,mesh generation and finite element analysis with Mimics,Geomagic,Solidworks,Hypermesh and ABAQUS sofeware.The finite element system model of humerus-PHILOS is constructed,and the influence of PHILOS bone plate on the stress distribution of humerus at different healing stages is simulated and analyzed,which provides a theoretical basis for the design and optimization of bionic bone plate.(2)Design and optimization of bionic proximal humerus bone plate.In this paper,a coupled bionic proximal humerus bone plate is proposed to effectively reduce stress shielding.The experimental design of 3 factors and 3 levels of elastic modulus of bone plate,elastic modulus of callus and plate screws was carried out,and the finite element analysis of the model was carried out.The stress shielding of bionic bone plate and PHILOS bone plate was compared and analyzed.According to the test results,the primary and secondary factors affecting stress shielding are:the elastic modulus of bone plate>the elastic modulus of callus>the number of screws.In order to obtain the maximum average reduction rate of stress shielding,the parameters of the factors are optimized,and the relationship among the elastic modulus of bone plate Z1,the elastic modulus of callus Z2 and the number of nails Z3 is obtained according to the analysis of response surface.The final optimization parameters are as follows:the elastic modulus of bone plate is 6.676GPa,the elastic modulus of callus is 166.445GPa,and the number of nails is 10.The maximum average reduction rate of stress shielding is 65.293%.(3)Design,manufacture and performance test of bionic proximal humerus bone plates.The 3D printing and manufacturing of bionic proximal humerus bone plate was carried out,and a mechanical performance test platform was built.The stress data were collected and compared with the finite element simulation stress,and the results showed that the stress change of the callus node without elderber,the stress change of the callus node under the PHILOS bone plate,and the stress change of the callus node under the bionic bone plate were consistent with finite element stress change.The bionic bone plate has significant low stress shielding.The stress shielding rate is the largest in the center under the side plate of the bone plate;For the same variable,the fewer the number of screws,the smaller the stress cover of the bone plate;The advantage of the number of screws is not as good as the elastic modulus of callus;Reduce the elastic modulus and number of screws of the bone plate,the more significant the reduction rate of stress shielding,so the bionic bone plate has significant properties such as light weight and low stress shielding.The bending performance test of bionic bone plate shows that the bionic structure has good low bending stiffness characteristics,which reduces the elastic modulus and number of screws of the bone plate,and also reduces the bending stiffness of the bone plate.Compared with the existing PHILOS bone plate,the bionic bone plate has significant low bending stiffness characteristics,and the bending stiffness reduction rate of the 10-hole titanium alloy bionic bone plate of the same material as the PHILOS bone plate is 16.6%,and under the same structure,compared with the 10-hole titanium alloy bionic bone plate,the bending stiffness reduction rate of the 10-hole CFR-PEEK bionic bone plate is 90.97%.