Document Detail


Physical properties of endovascular stents: an experimental comparison.
MedLine Citation:
PMID:  10834499     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Different endovascular stent types (AVE Bridge, AVE Bridge X, Memotherm, Palmaz Large, Palmaz Medium, Palmaz-Schatz Long-Medium, Perflex, S.MA.R.T., Symphony, and Wall-stent) of 4 cm length and 8 mm diameter were subjected to standardized physical tests. MATERIALS AND METHODS: The metal mass of each stent was assessed by weighing. The balloon-expandable stents were pneumatically tested for hoop strength. In self-expanding stents, radial resistive force and chronic outward force were determined with use of a loop test. Stent delivery system pushability was assessed in a crossover model. Stent radiopacity was analyzed quantitatively. RESULTS: The hoop strength of the balloon-expandable stents ranged from 15.8 N/cm (Perflex) to 28.9 N/cm (AVE Bridge X). The stent weight increased with greater hoop strength (Perflex, 0.046 g/cm vs. AVE Bridge X, 0.061 g(cm). The self-expanding stents had a radial resistive force between 0.39 N/cm (Wallstent) and 1.7 N/cm (Smart). The flexible balloon-expandable stents showed pushability values between 0.13/N (AVE Bridge) and 0.20/N (Perflex). The self-expanding stents had flexibilities between 0.13/N (Memotherm) and 0.24/N (Symphony). Radiopacity assessed with use of a phantom simulating the iliac region ranged from 92 (Palmaz Large) to 115 (AVE Bridge) on a 256-point gray scale (0 = black, 256 = white). CONCLUSIONS: There is no stent with ideal physical properties. However, depending on the characteristics of the arterial lesion to be treated, the most appropriate stent can be chosen.
Authors:
S H Duda; J Wiskirchen; G Tepe; M Bitzer; T W Kaulich; D Stoeckel; C D Claussen
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of vascular and interventional radiology : JVIR     Volume:  11     ISSN:  1051-0443     ISO Abbreviation:  J Vasc Interv Radiol     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-08-30     Completed Date:  2002-10-09     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9203369     Medline TA:  J Vasc Interv Radiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  645-54     Citation Subset:  IM    
Affiliation:
Department of Radiology, Eberhard-Karls-Universität Tübingen, Germany. stephan.duda@t-online.de
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MeSH Terms
Descriptor/Qualifier:
Alloys
Blood Vessel Prosthesis
Equipment Design
Physical Phenomena
Physics
Stainless Steel
Stents* / standards
Chemical
Reg. No./Substance:
0/Alloys; 12597-68-1/Stainless Steel; 52013-44-2/nitinol

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