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Polar-coordinate line-projection light-curing continuous 3D printing for tubular structures

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING 2024年第4期6卷 247-260页

作者： Wang, Huiyuan Liu, Siqin Yin, Xincheng Huang, Mingming Fu, Yanzhe Chen, Xun Wang, Chao Sun, Jingyong Yan, Xin Han, Jianmin Yang, Jiping Wang, Zhijian Wang, Lizhen Fan, Yubo Li, Jiebo Beihang Univ Inst Med Photon Beijing Adv Innovat Ctr Biomed Engn Key Lab Biomech & MechanobiolMinist EducSch Biol Beijing 100191 Peoples R China Beihang Univ Sch Mech Engn & Automat Beijing 100191 Peoples R China Peking Univ Sch & Hosp Stomatol Beijing 100081 Peoples R China Beihang Univ Sch Mat Sci & Engn Beijing 100191 Peoples R China

3D printing techniques offer an effective method in fabricating complex radially multi-material structures. However, it is challenging for complex and delicate radially multi-material model geometries without supporting structures, such as tissue vessels and tubular graft, among others. In this work, we tackle these challenges by developing a polar digital light processing technique which uses a rod as the printing platform. The 3D model fabrication is accomplished through line projection. The rotation and translation of the rod are synchronized to project and illuminate the photosensitive material volume. By controlling the distance between the rod and the printing window, we achieved the printing of tubular structures with a minimum wall thickness as thin as 50 micrometers. By controlling the width of fine slits at the printing window, we achieved the printing of structures with a minimum feature size of 10 micrometers. Our process accomplished the fabrication of thin-walled tubular graft structure with a thickness of only 100 micrometers and lengths of several centimeters within a timeframe of just 100 s. Additionally, it enables the printing of axial multi-material structures, thereby achieving adjustable mechanical strength. This method is conducive to rapid customization of tubular grafts and the manufacturing of tubular components in fields such as dentistry, aerospace, and more. Polar-coordinate-based line projection enables rapid printing of tubular structures with higher precision and compressive strength. Using a cylindrical auxiliary axis allows for the manufacture of radial multi-material structures and facilitates printing of coaxial structures. It is beneficial for the rapid customization of tubular implants and for manufacturing tubular components in dentistry, aerospace, and other fields.

关键词： 3D printing polar coordinate line projection light-curing tubular structure radially multi-material structures PROCESS PARAMETERS STENT FABRICATION

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