Achieving high mechanical properties of biodegradable vascular stents by four-axis 3D printing system and heat treatment

Xingrui Tong, Zhongsen Zhang*, Kunkun Fu, Yan Li*, Bingyan Cao, Wenzhao Wang, Biqiong Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study fabricated biodegradable polylactic acid (PLA) stents with extremely smooth surfaces by a four-axis printing system. Isothermal heat treatment has been carried out on the 3D-printed stent in a salt bath. The crystallinity of PLA has increased by 212% after heat treatment. Compared to the untreated stent, the heat-treated stent has an 11% higher radial supporting stiffness and a 33% higher maximum radial supporting load. The stent can also withstand bending deformation more safely by eliminating residual strain through heat treatment. These results suggest that the isothermal heat treatment is an effective technique for enhancing the load-bearing capacities of 3D-printed PLA stents.

Original languageEnglish
Article number134261
JournalMaterials Letters
Volume341
Early online date27 Mar 2023
DOIs
Publication statusPublished - 15 Jun 2023

Bibliographical note

Funding Information:
The authors would like to acknowledge the financial support from the National Nature Science Foundation of China (grant number: 12002239 , 12132011 , 12061130201 ), and the Royal Society-Newton Advanced Fellowship (grant number: NAF\R1\201132)

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • 3D-printing
  • Biodegradable stent
  • Heat treatment
  • Mechanical properties

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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