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Mechanical Properties of Various Z‐Stent Designs: An Endovascular Stent‐Grafting Perspective
Author(s) -
Bashar Abul Hasan Muhammad,
Kazui Teruhisa,
Washiyama Naoki,
Terada Hitoshi,
Yamashita Katsushi,
Haque Mohammad E.
Publication year - 2003
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1046/j.1525-1594.2003.06995.x
Subject(s) - stent , grafting , spiral (railway) , biomedical engineering , materials science , mathematics , surgery , medicine , composite material , mathematical analysis , polymer
Purpose: To comparatively assess the mechani‐cal behavior of various clinically relevant Z‐stent designs. Methods: A total of 16 Z‐stents of original, biliary, spiral, and double‐skirted designs (n=4 for each) were constructed using similar specifications for all. Stents were then evaluated for stiffness, snap opening force (SOF), flexibility, and displacement force using a novel tensiometer. Differences among the stents were determined using statistical methods. Stents explanted from dog aorta after a mean follow‐up of 13 months were examined under a scanning electron microscope for surface defects. Results: Forces required for about 50% reduction in diameter were 1.88 ± 0.16 N, 3.81 ± 0.21 N, 2.76 ± 0.22 N, and 3.35 ± 0.19 N for original, biliary, spiral, and skirted designs, respectively. Differences among the four designs were statistically significant at almost all points of measurement ( P < 0.0001). Biliary and skirted designs showed higher SOF values in the early measurements. Stents explanted from dog aorta after a mean duration of 13 months showed no obvious corrosion or breakage in the wire struts. Conclusions: Significant differences exist among the various Z‐stent designs in terms of their mechanical properties. Understanding them should help to select the appropriate stent for a given lesion. 316L stainless steel shows a favorable long‐term tissue interaction.