Full Length Article
The deteriorated degradation resistance of Mg alloy microtubes for vascular stent under the coupling effect of radial compressive stress and dynamic medium

https://doi.org/10.1016/j.jma.2022.05.004Get rights and content
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Highlights

  • Radial compressive stress was introduced in the degradation test of mg microtubes.

  • Dynamic medium and radial compressive stress accelerate mg microtubes degradation.

  • The degradation mechanism of mg microtube under different environments was proposed.

Abstract

The degradation of Mg alloys relates to the service performance of Mg alloy biodegradable implants. In order to investigate the degradation behavior of Mg alloys as vascular stent materials in the near service environment, the hot-extruded fine-grained Mg-Zn-Y-Nd alloy microtubes, which are employed to manufacture vascular stents, were tested under radial compressive stress in the dynamic Hanks’ Balanced Salt Solution (HBSS). The results revealed that the high flow rate accelerates the degradation of Mg alloy microtubes and its degradation is sensitive to radial compressive stress. These results contribute to understanding the service performance of Mg alloys as vascular stent materials.

Keywords

Mg alloy
Microtubes
Degradation behavior
Radial compressive stress
Dynamic conditions

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These authors contributed equally to this work