Research On Digital Mask Generation Method Used In Projection-SLA For Bio-scaffold

The bio-scaffolds in tissue engineering is one of the most promising fields in regenerative medicine,and it is also a combination of multidisciplinary fields.Rapid prototyping technologies can achieve the integration of structure design and manufacture of bio-scaffolds.As one of the most promising AM(additive manufacture)technologies to fabricate scaffolds,the DMD(digital micro-mirror device)based projection stereo-lithography has drawn increasing attentions of researchers all over the world.The regular slicing method,based on STL files,may be not appropriate for generating 2D-slices for complex scaffolds under some circumstances.It can be inefficient,lead to the accuracy loss,and even fail to complete the slicing process.In addition,in order to achieve a good balance between manufacture accuracy and efficiency,the adaptive slicing methods have been proposed by peer researchers.But the adaptive slicing method designed for complex scaffolds is still waiting for searching.The 2D-slices utilized by DMD based SLA are saved in binary or gray scale bitmaps,called digital masks.To find a more efficient generation method for digital masks also possess meaningful researchable value.The details of this research paper can be concluded as following lists:(1)A new two-step adaptive direct slicing approach for bio-scaffolds has been designed and achieved in Microsoft Visual Studio 2008,based on MFC and SolidWorks2011 API.The evaluation tests reflect that this method can meet the need of obtaining digital masks,the proposed IAD index and ESD index owns much better performance than some of its fellow indexes.(2)A novel parameterized digital-mask generation method for Projection Stereo-lithography in tissue engineering has been designed and achieved.This method avoids building and slicing the entire scaffolds' 3D models,it directly edit and generate digital masks.The evaluation tests reflect that this method matches well with DMD based SLA,and it is more efficient than the regular slicing methods.(3)To verify the practicality of the methods,a control software has been developed in Microsoft Visual Studio 2008,based on MFC.The digital masks generated by the proposed method can be used by the control software to manage the manufacture process of a DMD based SLA system.