Parametric Porous Structure Design with TPMS for Bone Tissue
The Triply Periodic Minimal Surface(TPMS)has zero curvature,and the scaffold has a connected high-porosity struc-ture that can better adapt to cell growth,nutrient flow and metabolite discharge.Based on traditional CAD-based TPMS porous scaffold design,the porosity,pore size and TPMS surface parameters have not established a clear correspondence,and the design lacks flexibility.By exploring the influence of threshold and period on porosity,a parametric design method for TPMSporous scaf-fold is proposed.Based on the TPMS design of the pore unit,the study found that the threshold and porosity are basically linear,and the period has nothing to do with the porosity,but the change of the period will significantly affect the pore size of the model.As a result,threshold and period are input as the main parameters of parametric design,and porous scaffolds with controllable porosity and pore size can be automatically generated.The method is implemented in the Grasshopper(GH)plug-in of Rhinocer-os,and example verification was also carried out.
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