Anatomy-shaped design of a fully-covered, biliary, self-expandable metal stent for treatment of benign XXXX .

@entity1 @entity788 @entity432 @entity253 @entity255
BACKGROUND AND STUDY AIMS: The treatment success of @entity253 with fully covered metal stents (CSEMS) is altered by high stent dislocation rates. We aimed to evaluate a new stent design to prevent dislocation. @entity1 AND METHODS: @entity1 with @entity253 were treated with a newly designed double-coned stent (dcSEMS). Mechanical analysis of the new stent was performed and it was compared with a cylindrical stent. RESULTS: A total of 13 dcCSEMS were implanted in 11 @entity1 (2 female, 9 male, median age 47, range 33-71). All @entity1 had @entity253 due to chronic @entity788 . No stent migration occurred. In all but one @entity1 the stents were removed. One @entity1 refused stent extraction and was lost to follow up. @entity432 occurred twice leading to @entity255 in both cases. The duration of stent treatment was 170 days (range 61-254). After extraction only one @entity1 had early recurrent stricture and received the same stent again. Three stents showed minimal tissue granulation at the papilla. One stent presented ingrowth at the proximal end and was removed after implantation of a second fully covered stent. Mechanical examination revealed significantly lower radial expansion force of the new stent as compared to the cylindrical stent. CONCLUSIONS: The new stent design has a low rate of migration. Biomechanical properties may explain this effect.
