Design And Performance Research Of Lumbar Fusion Cage Based On SLM Porous Structure

Selective Laser Melting(SLM)is an additive manufacturing technology that has been widely revealed in the fields of medicine and engineering.The technology has the characteristics of being customized and capable of manufacturing complex structures,especially for human bone implants in the medical clinical field.This article cuts through the need for personalized implantable lumbar fusion cages and uses SLM technology to create porous structural implants that match the lumbar spine of the human body.The main research contents are as follows:Firstly,the design requirements of the human lumbar fusion cage in the medical field were analyzed.CT scan was used to obtain the relevant human body part data,and then MMIMS software was used to model.After continuous experiment,the cell body with the porous structure which best meets the requirements of human lumbar spine structure was selected.Regular octahedral unit.The positive octahedron is used as a unit cell to construct a cage model of the porous structure,and the forward design is used to analyze the mechanical properties of the regular octahedral structure.Secondly through the finite theoretical calculation of the porous structure,the realization of the finite element method is introduced,and the experimental model is the regular octahedral structure.The constructed porous structure under the fixed constraints meets the requirements of human mechanics,and the lumbar fusion cage is analyzed in the human body.Under the load of the mechanical properties and deformation,the foundation for the subsequent SLM molding lumbar fusion cage.Then,an in-depth analysis of the important factors affecting SLM molding samples and explaining the molding principle.The optimal molding process parameters of stainless steel 316L material under SLM technology were studied.The orthogonal experiment method was used to compare and demonstrate the single layer,single channel molding and block experimental forming method,and the best experimental data and parameters were obtained.The body shaping test method successfully printed the lumbar fusion cage model,and the physical and chemical properties of the molded parts were tested.Finally,the performance test of the stainless steel 316L material test piece was carried out.The dimensional accuracy,porosity,mechanical properties and corrosion resistance of the molded part were tested and the microscopic observation of the porous structure cell body was carried out.Through the experimental results of elastic modulus,tensile strength,yield strength and other performance parameters,the design of different cell,arm diameter of the regular octahedron structure,the selection of the best length of the cell and the arm diameter of the regular octahedron and human lumbar spine mechanics The performance is consistent,and finally the porous structure cage is successfully obtained,which lays a foundation for the clinical trial of human lumbar fusion cage manufacturing.