4.5 Article

A 5+1-Axis 3D Printing Platform for Producing Customized Intestinal Fistula Stents

Journal

3D PRINTING AND ADDITIVE MANUFACTURING
Volume 10, Issue 5, Pages 955-970

Publisher

MARY ANN LIEBERT, INC
DOI: 10.1089/3dp.2021.0044

Keywords

bio-printing; enteroatmospheric fistula; 5-axis; linkage; open abdomen; Thermoplastic polyurethane

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In this study, a 5 + 1-axis 3D printing platform was developed to produce support-free intestinal fistula stents. A dynamic slicing algorithm was used to process a 3D model of the target stent shape, resulting in improved printing efficiency, superior stent surface properties and structure, ideal elasticity, and mechanical strength to meet the mechanical requirements of the human body. Static simulations demonstrated the importance of axial printing techniques, while the stent itself showed excellent biocompatibility.
Tailored intestinal fistula stents with a hollow bent pipe structure prepared by using a three-axis bio-printing platform are often unsuitable due to low printing efficiency and quality caused by the unavoidable need for a supporting structure. Herein, a 5 + 1-axis 3D printing platform was built and developed for producing support-free intestinal fistula stents. A 3D model of the target stent shape and dimensions was treated by a dynamic slicing algorithm, which was then used to prepare a motion control code. Our printing method showed improved printing efficiency, superior stent surface properties and structure and ideal elasticity and mechanical strength to meet the mechanical requirements of the human body. Static simulations showed the importance of axial printing techniques, whereas the stent itself was shown to have excellent biocompatibility with wettability and cell proliferation tests. We present a customizable, efficient, and high-quality method with the potential for preparing bespoke stents for treating intestinal fistulas.

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