Study on rapid modeling and manufacturing method of porous bone scaffold based on voxel model

For solving the modeling problem of porous structure design of bone scaffold, a modeling method of porous bone scaffold based on voxel model was proposed. Firstly, the surface of model triangular facets of bone scaffold was reconstructed by moving cube (MC) algorithm with the computer tomographic (CT) images. Secondly, a rapidly slicing algorithm based on surface model was proposed to obtain the cross-sectional profile of bone scaffold. Then, an isometric scanning line of cross-sectional profile was filled and dispersed to construct voxel model; subsequently, the pore unit was designed based on voxel, and the voxel model of porous bone scaffold was constructed by filling the pore units; finally, combined with additive manufacturing process, a method to generate processing path directly based on the voxel model was proposed. It can be concluded from the experiment that the porous bone scaffold could be constructed by the proposed algorithm. The parameters including pore size and porosity on the bone scaffold could be controlled through adjusting the voxel size and pore unit structures. The processing path was obtained directly from the voxel model, thus providing a feasible method for the design and manufacture of the porous bone scaffold. (author)