An in vitro model for preclinical testing of thrombogenicity of resorbable metallic stents

Emily K. Walker, Eric A. Nauman, Jean Paul Allain, Lia A. Stanciu

Research output: Research - peer-reviewArticle

Abstract

Vascular stents that can biodegrade and disappear in time have been reported as a promising solution to the problems of late-stent thrombosis and in-stent restenosis. Iron alloys in particular have many advantages in terms of cytocompatibility and mechanical properties. Despite mechanical behavior and biocompatibility studies, little attention has been given to the thrombogenic potential of these stents. This article presents the first study that aims to close this gap by addressing the hemocompatibility of resorbable iron-based alloys and composites in an in vitro porcine blood model. The investigated braided biodegradable stents included 99.95% pure Fe (50% cold worked), Fe35Mn alloy, Fe35Mn-25% ZM21 (ZM21 is 2% Zn, 0.5% Mn, balance Mg), Fe-25% Mg, and Fe-57% Mg. All stents were formed by braiding 127 μm diameter wires into stents with an outer diameter of 6.35 mm. Inflammatory reaction and thrombocyte activation were examined by assessment of β-thromboglobulin, thrombin-antithrombin complex, and polymorphonuclear elastase levels. The potential of Fe35Mn for use in vascular stenting is demonstrated by its exhibition of the least thrombogenic potential among tested materials. All bioresorbable Fe-Mn alloy compositions showed a reduced propensity towards platelet adhesion compared to 316L stainless steel, further indicating a general positive shift towards reduced thrombogenicity compared to traditional stents.

LanguageEnglish (US)
Pages2118-2125
Number of pages8
JournalJournal of Biomedical Materials Research - Part A
Volume103
Issue number6
DOIs
StatePublished - Jun 1 2015

Fingerprint

Stents
Testing
beta-Thromboglobulin
Iron alloys
Pancreatic Elastase
Stainless Steel
Platelets
Biocompatibility
Blood
Adhesion
Iron
Chemical activation
Wire
Mechanical properties
Composite materials
Chemical analysis
antithrombin III-protease complex
Fe-35Mn alloy
Stainless steel

Keywords

  • biomaterials
  • cardiovascular device
  • medical device

ASJC Scopus subject areas

  • Ceramics and Composites
  • Biomaterials
  • Biomedical Engineering
  • Metals and Alloys

Cite this

An in vitro model for preclinical testing of thrombogenicity of resorbable metallic stents. / Walker, Emily K.; Nauman, Eric A.; Allain, Jean Paul; Stanciu, Lia A.

In: Journal of Biomedical Materials Research - Part A, Vol. 103, No. 6, 01.06.2015, p. 2118-2125.

Research output: Research - peer-reviewArticle

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