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Mechanical property, biocorrosion and in vitro biocompatibility evaluations of Mg–Li–(Al)–(RE) alloys for future cardiovascular stent application ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
562 51 2013 11 PDF Available
Title
Mechanical property, biocorrosion and in vitro biocompatibility evaluations of Mg–Li–(Al)–(RE) alloys for future cardiovascular stent application ☆
Abstract

Mg–Li-based alloys were investigated for future cardiovascular stent application as they possess excellent ductility. However, Mg–Li binary alloys exhibited reduced mechanical strengths due to the presence of lithium. To improve the mechanical strengths of Mg–Li binary alloys, aluminum and rare earth (RE) elements were added to form Mg–Li–Al ternary and Mg–Li–Al–RE quarternary alloys. In the present study, six Mg–Li–(Al)–(RE) alloys were fabricated. Their microstructures, mechanical properties and biocorrosion behavior were evaluated by using optical microscopy, X-ray diffraction, scanning electronic microscopy, tensile tests, immersion tests and electrochemical measurements. Microstructure characterization indicated that grain sizes were moderately refined by the addition of rare earth elements. Tensile testing showed that enhanced mechanical strengths were obtained, while electrochemical and immersion tests showed reduced corrosion resistance caused by intermetallic compounds distributed throughout the magnesium matrix in the rare-earth-containing Mg–Li alloys. Cytotoxicity assays, hemolysis tests as well as platelet adhesion tests were performed to evaluate in vitro biocompatibilities of the Mg–Li-based alloys. The results of cytotoxicity assays clearly showed that the Mg–3.5Li–2Al–2RE, Mg–3.5Li–4Al–2RE and Mg–8.5Li–2Al–2RE alloys suppressed vascular smooth muscle cell proliferation after 5 day incubation, while the Mg–3.5Li, Mg–8.5Li and Mg–8.5Li–1Al alloys were proven to be tolerated. In the case of human umbilical vein endothelial cells, the Mg–Li-based alloys showed no significantly reduced cell viabilities except for the Mg–8.5Li–2Al–2RE alloy, with no obvious differences in cell viability between different culture periods. With the exception of Mg–8.5Li–2Al–2RE, all of the other Mg–Li–(Al)–(RE) alloys exhibited acceptable hemolysis ratios, and no sign of thrombogenicity was found. These in vitro experimental results indicate the potential of Mg–Li–(Al)–(RE) alloys as biomaterials for future cardiovascular stent application and the worthiness of investigating their biodegradation behaviors in vivo.

Keywords
Mg–Li-based alloys; Biodegradable; Corrosion; Biocompatibility; In vitro
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Mechanical property, biocorrosion and in vitro biocompatibility evaluations of Mg–Li–(Al)–(RE) alloys for future cardiovascular stent application ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 9, Issue 10, November 2013, Pages 8488–8498
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us