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Related Experiment Video

Updated: Jun 8, 2025

Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
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Two-Staged Technology for CoCr Stent Production by SLM.

Polina Kilina1,2, Andrey Drozdov1,2, Alex G Kuchumov2,3

  • 1Department of Innovative Engineering Technologies, Perm National Research Polytechnic University, 614990 Perm, Russia.

Materials (Basel, Switzerland)
|November 9, 2024
PubMed
Summary

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Numerical and Experimental Study of a Lattice Structure for Orthopedic Applications.

Materials (Basel, Switzerland)·2023

This study details a two-stage approach for fabricating Cobalt-Chromium (CoCr) stents using selective laser melting (SLM). The method optimizes manufacturing regimes for accurate and high-quality 3D-printed medical devices.

Area of Science:

  • Additive Manufacturing
  • Materials Science
  • Biomedical Engineering

Background:

  • Additive manufacturing offers design freedom and automation for producing complex structures.
  • Selective laser melting (SLM) is a key 3D printing technology for medical implants, yet its application in stent production requires further investigation.
  • Cobalt-Chromium (CoCr) alloys are suitable for medical devices due to their properties.

Purpose of the Study:

  • To present the technological aspects of CoCr stent fabrication using selective laser melting (SLM).
  • To develop and validate manufacturing regimes for producing dimensionally accurate and high-quality CoCr stents.
  • To establish a fundamental approach for CoCr stent SLM fabrication.

Main Methods:

  • Characterization of CoCr powder properties (physical, chemical, technological).
Keywords:
CoCr alloy powderadditive technologymetal stentprocess–structure–property relationshipselective laser melting

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  • Parametric design of mesh stent models.
  • A two-stage SLM process: single-track fusion development and full stent manufacturing.
  • Simulation of the single-track fusion process to determine optimal laser synthesis parameters.
  • Realization and analysis of 27 SLM manufacturing regimes.
  • Investigation of surface roughness control methods.

    • Main Results:

    • Established dependence of single-track width and height on laser power, exposition time, and point distance.
    • Identified qualitative characteristics of tracks mimicking stent struts, distinguishing favorable and unfavorable fusion regimes.
    • Determined optimal melting bath temperature and laser regimes for stent fabrication.
    • Analyzed methods for regulating surface roughness of stent structural elements.

    Conclusions:

    • The developed two-stage approach provides a fundamental framework for CoCr stent fabrication via SLM.
    • The study successfully optimized SLM parameters for producing CoCr stents with improved dimensional accuracy and quality.
    • This research addresses a gap in the literature regarding SLM applications for CoCr stent manufacturing.