A Study On The Modeling And Optimizing Method Of Three-dimensional Titanium Implant For Cranioplasty

To improve the mechanical property of the 3D (three-dimensional) titanium implant of cranioplasty, and achieve a better result for the patient, the CAD(computer aided design) technology is used to design the customized cranium implant in this paper. Aiming at common 3D cranium titanium, a FE (finite element) model of the titanium implant is established, and the rib technology is used to optimize the structure of the titanium implant.The craniocerebral biomechanics foundation knowledge, the mechanics of shells foundation knowledge, the FE method and the orthogonal experiments method are introduced firstly in this paper. Then the 3D defect skull is reconstructed based on CT images and the surface model of the cranium implant is designed, accordingly the geometrical model and the FE model of the titanium implant are established. Following that, the structure of the titanium implant is optimized using convex rib. In order to make certain the optimization effect, the orthogonal design is used in optimization by choosing the maximal distortion of the reinforced titanium implant as index, using the rib's length, width, and height as orthogonal experiment's factors, defining three different levels for each factor. It is proved that the deformation of titanium implant can be reduced by using rib, and the remarkable parameter seems to be the rib's width in the orthogonal experiment. The effects of the parameters to the mechanical property are also obtained in the experiments. In addition, a case study is given to explain the optimization process. Finally, the modeling and optimizing method of the 3D titanium implant are summarized, and the future work is expected.