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Copyright ©2011 Baishideng Publishing Group Co.
World J Gastroenterol. Jan 14, 2011; 17(2): 144-150
Published online Jan 14, 2011. doi: 10.3748/wjg.v17.i2.144
Table 2 Characteristics of conventional and anti-reflux mechanism self-expanding metal stents
MaterialLengthInner diameterConstrainabilityForeshorteningAnti-reflux mechanism
Conventional SEMS
UltraflexNitinol10 cm (7 cm CS)18 mm with 23 mm PFBraided nylon wire20% to 40%
Polyurethane sheath12 cm (9 cm CS)23 mm with 28 mm PFNot reconstrainable when partially deployed
15 cm (12 cm CS)
Z stentStainless steel8, 10, 12, 14 cm18 mm with 25 mm PF and DFPolyethylene sheathNone
Polyurethane coveringReconstrainable when partially deployed
WallstentElgiloy10 cm (8 cm CS)20 mm with 23 mm PF and DFPolyethylene sheathUp to 28%
Polyurethane sheath15 cm (13 cm CS)Reconstrainable when
partially deployed
SEMS with an anti-reflux mechanism
Dua Z-stentPolyurethane sleeve (collapses with gastric pressure)
DO stentTricuspid valve
Fer-X-Ella stentStainless steel with polyethylene covering and windsock type valve