Assessment of a Polyester-Covered Nitinol Stent in the Canine Aorta and Iliac Arteries
- Department of Radiology, University of Illinois College of Medicine at Peoria, 1 Illini Drive, Peoria, IL 61656 (United States)
- Department of Pathology, University of Illinois College of Medicine at Peoria, 1 Illini Drive, Peoria, IL 61656 (United States)
Purpose: To evaluate the patency and healing characteristics of a woven polyester fabric-covered stent in the canine model.Methods: Twenty-four self-expanding covered stents were placed in the infrarenal aorta and bilateral common iliac arteries of eight dogs and evaluated at 1 (n = 2), 3 (n = 2), and 6 (n = 4) months. Stent assessment was done using angiography prior to euthanasia, and light and scanning electron microscopy.Results: Angiographically, just prior to euthanasia, 8 of 8 aortic and 14 of 16 iliac endovascular covered stents were patent. Histologically, the stented regions showed complete endothelialization 6 months after graft implantation. A neointima had formed inside the stented vessel regions resulting in complete encasement of the fabric-covered stent by 3 months after graft implantation. Medial compression with smooth muscle cell atrophy was present in all stented regions. Explanted stent wires, examined by scanning electron microscopy, showed pitting but no cracks or breakage.Conclusion: The covered stent demonstrated predictable healing and is effective in preventing stenosis in vessels 10.0 mm or greater in diameter but does not completely preclude stenosis in vessels 6.0 mm or less in diameter.
- OSTI ID:
- 21083591
- Journal Information:
- Cardiovascular and Interventional Radiology, Vol. 23, Issue 5; Other Information: DOI: 10.1007/s002700010087; Copyright (c) 2000 Springer-Verlag New York Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 0174-1551
- Country of Publication:
- United States
- Language:
- English
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