A newly designed big cup nitinol stent for gastric outlet obstruction

摘要

AIM:To find out whether a newly designed big cup nitinol stent is suitable for treatment of patients with gastric outlet obstruction resulting from gastric cancer.METHODS:The new stent is composed of a proximal big cup segment(20 mm in length and 48-55 mm in diameter),a middle part(60 mm in length and 20 mm in diameter)covered by a polyethylene membrane and a distal sphericity(20 mm in length and 28 mm in diameter).Half of the proximal big cup segment is also covered by a polyethlene membrane,which is adjacent to the middle part of the stent.The stent is preloaded in a 6.0-mm-diameter introducer system.Thirteen patients with gastric outlet obstruction resulting from gastric cancer received the new stents under endoscopic and fluoroscopic guidance.RESULTS:Technical success was achieved in 12 of 13(92.3%)patients.Among the 12 patients in whom endoscopic stent was placed successfully,the clinical success rate was 91.7%during a follow-up of average 6.5 mo.During the first month follow-up,the migration rate was 0%,recurrent obstruction 0%and gastric bleeding 8.3%.During the follow-up between 2-12 mo,no migration,recurrent obstruction and gastric bleeding occurred.CONCLUSION:The proximal big cup segment seems to be effective and promising for technical efficacy,clinical outcome,and preventing migration and tumor ingrowth and increasing the emptying rate of sinus ventriculi.