Enhancing flexibility and strength-to-weight ratio of polymeric stents: A new variable-thickness design approach

• Published in: Journal of the mechanical behavior of biomedical materials Vol. 150; p. 106262
• Main Authors: Khatami, Mohamad, Doniavi, Ali, Abazari, Amir Musa, Fotouhi, Mohammad
• Format: Journal Article
• Language: English
• Published: Netherlands 01.02.2024
• Subjects: Finite Element Analysis; Humans; Polymers; Printing, Three-Dimensional; Prosthesis Design; Stents; Stress, Mechanical; Finite element method; Variable-thickness; Flexibility; Stent; 3D printing
• ISSN: 1751-6161; 1878-0180; 1878-0180
• DOI: 10.1016/j.jmbbm.2023.106262

This paper presents a new design strategy to improve the flexibility and strength-to-weight ratio of polymeric stents. The proposed design introduces a variable-thickness (VT) stent that outperforms conventional polymeric stents with constant thickness (CT). While polymeric stents offer benefits like flexibility and bioabsorption, their mechanical strength is lower compared to metal stents. To address this limitation, thicker polymer stents are used, compromising flexibility and clinical performance. Leveraging advancements in 3D printing, a new design approach is introduced in this study and is manufactured by the Liquid Crystal Display (LCD) 3D printing method and PLA resin. The mechanical performance of CT and VT stents is compared using the Finite Element Method (FEM), validated by experimental tests. Results demonstrate that the VT stent offers significant improvements compared to a CT stent in bending stiffness (over 20%), reduced plastic strain distribution of expansion (over 26%), and increased radial strength (over 10%). This research showcases the potential of the VT stent design to enhance clinical outcomes and patient care.