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.
|Early online date||27 Mar 2023|
|Publication status||Early online date - 27 Mar 2023|
Bibliographical noteFunding 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)
© 2023 Elsevier B.V.
- Biodegradable stent
- Heat treatment
- Mechanical properties
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering