A Novel, Fully Covered Laser-Cut Nitinol Stent with Antimigration Properties for Nonresectable Distal Malignant Biliary Obstruction: A Multicenter Feasibility Study

作者：Lsayama Hiroyuki^*; Kawakubo Kazumichi; Nakai Yousuke; Inoue Kouta; Gon Chimyon; Matsubara Saburo; Kogure Hirofumi; Ito Yukiko; Tsujino Takeshi; Mizuno Suguru; Hamada Tsuyoshi; Uchino Rie; Miyabayashi Koji; Yamamoto Keisuke; Sasaki Takashi; Yamamoto Natsuyo; Hirano Kenji; Sasahira Naoki; Tada Minoru; Koike Kazuhiko

来源：Gut and Liver, 2013, 7(6): 725-730.

DOI：10.5009/gnl.2013.7.6.725

• Cholestasis, extrahepatic
• Stents
• Cholangiography
• Endoscopic retrograde

Background/Aims: Stent migration occurs frequently, but the prevention of complications resulting from covered self-expandable metal stents (C-SEMSs) remains unresolved. We prospectively assessed a newly developed C-SEMS, a modified covered Zeo stent (m-CZS), in terms of its antimigration effect. Methods: Between February 2010 and January 2011, an m-CZS was inserted into 42 patients (31 initial drainage cases and 11 reintervention cases) at a tertiary referral center and three affiliated hospitals. The laser-cut stent was flared for 1.5 cm at both ends, with a 1 cm raised bank located 1 cm in from each flared end. The main outcome of this study was the rate of stent migration, and secondary outcomes were the rate of recurrent biliary obstruction (RBO), the time to RBO, the frequencies of complications, and overall survival. Results: Of the 31 patients with initial drainage, stent migration occurred in four (12.9%, 95% confidence interval, 5.1% to 29.0%), with a mean time of 131 days. RBO occurred in 18 (58%), with a median time to RBO of 107 days. Following previous C-SEMS migration, seven of 10 patients (70%) did not experience m-CZS migration until death. Conclusions: m-CZSs with antimigration properties effectively, although not completely, prevented stent migration after stent insertion.

• 出版日期2013-11