Novel tapered-and-flared fully covered self-expandable metal stent for distal bile duct obstruction

Stent migration is a major problem that can occur when using a fully covered self-expandable metal stent (FCSEMS) in malignant distal bile duct stricture. The K-papilla Stent (S and G Biotech, Yongin, Korea) ([Fig. 1]) is an FCSEMS with both a tapered portion and flared portion. This stent can be adjusted to the shape of the distal bile duct to the duodenum and has a narrowed papillary portion, which can stabilize its position and prevent migration.