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Related Experiment Video

Updated: Feb 11, 2026

Biodegradable Magnesium Stent Treatment of Saccular Aneurysms in a Rat Model - Introduction of the Surgical Technique
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A quantitative study on magnesium alloy stent biodegradation.

Yuanming Gao1, Lizhen Wang1, Xuenan Gu1

  • 1Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China.

Journal of Biomechanics
|May 9, 2018
PubMed
Summary
This summary is machine-generated.

Multi-dimensional corrosion accelerates magnesium alloy stent degradation. Corrosion rates increase with exposed surfaces, impacting mechanical integrity and predicting stent performance.

Keywords:
Biodegradable metalsContinuum damage mechanicsCoronary stentsCorrosionFinite element method

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Area of Science:

  • Biomaterials Science
  • Corrosion Engineering
  • Mechanical Engineering

Background:

  • Magnesium alloy stents (MAS) face rapid corrosion, limiting their scaffolding time.
  • Existing models often simplify corrosion to one dimension, neglecting effects on complex structures like edges and corners.

Purpose of the Study:

  • To quantitatively investigate the impact of multi-dimensional corrosion on magnesium alloys.
  • To develop a phenomenological corrosion model accounting for multi-dimensional effects.
  • To improve the prediction of MAS degradation during the scaffolding period.

Main Methods:

  • Immersion tests using AZ31B magnesium alloy cubes with varying exposed surfaces.
  • Quantitative analysis of corrosion rates based on the number of exposed surfaces.
  • Development of a phenomenological corrosion model incorporating multi-dimensional corrosion effects.
  • Finite element simulation using the developed model to assess morphological and mechanical changes.

Main Results:

  • Corrosion rates were found to be nearly proportional to the number of exposed surfaces, particularly without significant pitting.
  • A hexahedron element's corrosion rate accelerates with increased exposed surfaces in multi-dimensional corrosion.
  • Damage ratios among elements of the same size correlated with ratios of corrosion-surface numbers under uniform corrosion.

Conclusions:

  • The developed model accurately reflects the influence of multi-dimensional corrosion on magnesium alloys.
  • The model enhances the quantitative prediction of MAS degradation, providing detailed insights into morphology and mechanics.
  • This approach is crucial for optimizing MAS design and predicting in vivo performance.