Abstract
Yield strengths exceeding 1 GPa with elastic strains exceeding 1 pct were measured in novel bioabsorbable wire materials comprising high-purity iron (Fe), manganese (Mn), magnesium (Mn), and zinc (Zn), which may enable the development of self-expandable, bioabsorbable, wire-based endovascular stents. The high strength of these materials is attributed to the fine microstructure and fiber textures achieved through cold drawing techniques. Bioabsorbable vascular stents comprising nutrient metal compositions may provide a means to overcome the limitations of polymer-based bioabsorbable stents such as excessive strut thickness and poor degradation rate control. Thin, 125-μm wires comprising combinations of ferrous alloys surrounding a relatively anodic nonferrous core were manufactured and tested using monotonic and cyclic techniques. The strength and durability properties are tested in air and in body temperature phosphate-buffered saline, and then they were compared with cold-drawn 316L stainless steel wire. The antiferromagnetic Fe35Mn-Mg composite wire exhibited more than 7 pct greater elasticity (1.12 pct vs 1.04 pct engineering strain), similar fatigue strength in air, an ultimate strength of more than 1.4 GPa, and a toughness exceeding 35 mJ/mm3 compared with 30 mJ/mm3 for 316L.
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Acknowledgments
Funding from Fort Wayne Metals Research (Grant No. 8000039480) is gratefully acknowledged. The authors thank P. Irazoqui, E.A. Stach, L.E. Kay, W.S. VanDyke, B. Deorosan, M. Susilo, D.L. Snider, and B. Liechty for technical support and helpful discussions. C. Houle’s help in performing the body temperature fatigue testing during her internship with Fort Wayne Metals R&D is gratefully acknowledged.
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Manuscript submitted February 15, 2012.
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Schaffer, J.E., Nauman, E.A. & Stanciu, L.A. Cold-Drawn Bioabsorbable Ferrous and Ferrous Composite Wires: An Evaluation of Mechanical Strength and Fatigue Durability. Metall Mater Trans B 43, 984–994 (2012). https://doi.org/10.1007/s11663-012-9661-3
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DOI: https://doi.org/10.1007/s11663-012-9661-3