PARAMETRIC DESIGN, MECHANICAL PROPERTIES AND PERMEABILITY OF BIOMEDICAL POROUS SCAFFOLDS BASED ON TYPICAL STRUCTURE UNITS

Structure unit type is the most important factor for the mechanical properties and permeability of biomedical porous scaffolds. Therefore, in this work, four kinds of commonly used structure units including three periodic minimal surface (Primitive (P) and Gyroid (G) structures), body-centered cubic (BCC) and diamond (D) structures were chosen to design the structure units and porous scaffolds with the same porosity, and the mechanical and permeability of the structure units and scaffolds were systematically analyzed by using the finite element method. The results show that the elastic modulus of scaffolds decreases with the increase of porosity, and the order of elastic modulus is: P > D > G > BCC structure. P structure unit and porous scaffolds exhibit the best deformation resistance, but the structures have the most severe stress concentration at the joints. BCC structure unit and porous scaffolds have the worst deformation resistance, and the stress concentration at the joints is also obvious. Fluid simulation shows that the porous scaffolds exhibit good permeability and can meet the requirements for the use of biomedical porous scaffolds. The results of this paper provide a theoretical basis for the design and manufacture of porous scaffolds, and have a certain reference value.