NDLI: A simplified in vivo approach for evaluating the bioabsorbable behavior of candidate stent materials.

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A simplified in vivo approach for evaluating the bioabsorbable behavior of candidate stent materials.

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A simplified in vivo approach for evaluating the bioabsorbable behavior of candidate stent materials.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Pierson, Daniel Edick, Jacob Tauscher, Aaron Pokorney, Ellen Bowen, Patrick Gelbaugh, Jesse Stinson, Jon Getty, Heather Lee, Chee Huei Drelich, Jaroslaw Goldman, Jeremy
Description	Country affiliation: United States Author Affiliation: Pierson D ( Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan 49931-1295, USA.)
Abstract	Metal stents are commonly used to revascularize occluded arteries. A bioabsorbable metal stent that harmlessly erodes away over time may minimize the normal chronic risks associated with permanent implants. However, there is no simple, low-cost method of introducing candidate materials into the arterial environment. Here, we developed a novel experimental model where a biomaterial wire is implanted into a rat artery lumen (simulating bioabsorbable stent blood contact) or artery wall (simulating bioabsorbable stent matrix contact). We use this model to clarify the corrosion mechanism of iron (≥99.5 wt %), which is a candidate bioabsorbable stent material due to its biocompatibility and mechanical strength. We found that iron wire encapsulation within the arterial wall extracellular matrix resulted in substantial biocorrosion by 22 days, with a voluminous corrosion product retained within the vessel wall at 9 months. In contrast, the blood-contacting luminal implant experienced minimal biocorrosion at 9 months. The importance of arterial blood versus arterial wall contact for regulating biocorrosion was confirmed with magnesium wires. We found that magnesium was highly corroded when placed in the arterial wall but was not corroded when exposed to blood in the arterial lumen for 3 weeks. The results demonstrate the capability of the vascular implantation model to conduct rapid in vivo assessments of vascular biomaterial corrosion behavior and to predict long-term biocorrosion behavior from material analyses. The results also highlight the critical role of the arterial environment (blood vs. matrix contact) in directing the corrosion behavior of biodegradable metals.
File Format	HTM / HTML
ISSN	15524973
Issue Number	1
Volume Number	100
e-ISSN	15524981
Journal	Journal of Biomedical Materials Research Part B: Applied Biomaterials
Language	English
Publisher	Wiley
Publisher Date	2012-01-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biomedical engineering Absorbable Implants Materials Testing Methods Models, Biological Stents Animals Corrosion Iron Chemistry Magnesium Rats Rats, Sprague-dawley Time Factors Journal Article Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biomedical Engineering

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