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Clinical advantages of a metal stent with an S‐shaped anti‐reflux valve in malignant biliary obstruction

Transpapillary stent insertion is the standard treatment for palliating malignant biliary obstruction. However, luminal occlusion often occurs due to sludge formation, tumor ingrowth, or tumor overgrowth. Currently, influx of duodenal contents by duodenobiliary reflux is considered a mechanism of stent obstruction. The aim of the present study was to evaluate the efficacy and safety of a metal stent with an anti‐reflux valve in distal malignant biliary obstruction.