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Assessment of the trackability, flexibility, and conformability of coronary stents: A comparative analysis
Author(s) -
Rieu Régis,
Barragan Paul,
Garitey Vincent,
Roquebert Pierre O.,
Fuseri Jean,
Commeau Philippe,
Sainsous Joel
Publication year - 2003
Publication title -
catheterization and cardiovascular interventions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.988
H-Index - 116
eISSN - 1522-726X
pISSN - 1522-1946
DOI - 10.1002/ccd.10583
Subject(s) - stent , medicine , curvature , biomedical engineering , stiffness , flexibility (engineering) , coronary stent , coronary angiography , surgery , cardiology , geometry , mathematics , composite material , materials science , myocardial infarction , restenosis , statistics
The efficacy and safety of coronary stent implantation depend on the mechanical features of these devices when deployed in atheromatous lesions of various morphologies. We evaluated the trackability, flexibility, and conformability of 17 coronary stents using specific mechanical bench tests. The quantifications used a dynamometer for assessment of trackability (maximal strength) and flexibility (stiffness) and a 3D optical gauging machine for assessment of conformability (distance between stent and arterial wall in a curvature). The maximal strength (measuring the trackability) ranged respectively from 0.24 ± 0.06 and 0.38 ± 0.03 N (Seaquest) to 1.31 ± 0.42 and 1.34 ± 0.35 N (Carbostent), concerning respectively curvatures of 90° ( P < 0.0001) and 135° ( P < 0.0001). The stiffness (measuring the flexibility) ranged from 0.53 ± 0.16 (Seaquest) to 1.28 ± 0.10 N/mm (NIR Royal; P < 0.0001). The mean distance between stent and external curvature (external conformability) ranged from 0.15 ± 0.06 mm (S7) to 0.57 ± 0.4 mm (NIR Royal; P < 0.0001). The mean distance between stent and internal curve (internal conformability) ranged from 0.26 ± 0.13 (S7) to 0.44 ± 0.12 mm (S670; P < 0.0001). These results may influence the choice of a particular stent adapted to a specific coronary anatomy. Cathet Cardiovasc Intervent 2003;59:496–503. © 2003 Wiley‐Liss, Inc.