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Proceedings 2018, 2(8), 523; https://doi.org/10.3390/ICEM18-05398

A Study on Designing Balloon Expandable Magnesium Alloy Stent for Optimization of Mechanical Characteristics

1
Department of Mechanical Engineering, Okayama University of Science, Okayama 700-0005, Japan
2
Japan Medical Device Technology Co., Ltd., Kumamoto 861-2202, Japan
Presented at the 18th International Conference on Experimental Mechanics (ICEM18), Brussels, Belgium, 1–5 July 2018.
*
Author to whom correspondence should be addressed.
Published: 28 June 2018
PDF [513 KB, uploaded 18 July 2018]

Abstract

Recently, the demand for a bio-absorbable coronary stent to promote recovery after an operation has increased. An option for such a stent is one made of a magnesium alloy, which has biodegradable properties. However, magnesium alloys have lower rigidity and lower ductility than other metals; as such, an appropriate stent structure is required to ensure radial rigidity. In this study, design parameters for an AZ31 magnesium alloy stent with sufficient radial rigidity were investigated. The necessary radial rigidity was determined by comparison tests against commercially available stents. The design parameters of the cell struts were selected and the optimum values to achieve high radial rigidity were investigated by means of elastic–plastic finite element analysis. Finally, a trial model stent based on the optimized design parameters was produced. It was confirmed that the model had sufficient radial rigidity, with no fracturing evident during crimping and expansion processes.
Keywords: medical device; balloon expandable coronary stent; magnesium alloy; mechanical characteristics; finite element analysis medical device; balloon expandable coronary stent; magnesium alloy; mechanical characteristics; finite element analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shimizu, I.; Wada, A.; Sasaki, M. A Study on Designing Balloon Expandable Magnesium Alloy Stent for Optimization of Mechanical Characteristics. Proceedings 2018, 2, 523.

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