title: Understanding the Mechanical forces of Self-Expandable Metal Stents in the Biliary Ducts.
abstract: Self-expandable metallic stent (SEMS) was an effective biliary endoprosthesis. Mechanical properties of SEMS, radial and axial force (RF, AF), may play important roles in the bile duct after placement. RF was well known dilation force and influenced on the occurrence of migration. AF, newly proposed by this author, was defined as the recovery force when the SEMS vended. AF was related with the cause of bile duct kinking, pancreatitis, and cholecystitis due to the compression of the bile duct, orifice of the cystic duct, and pancreatic orifice. Ideal SEMS may show high RF and low AF.
authors: Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. isayama-tky@umin.ac.jp.
authors: Hiroyuki
authors: H
authors: Isayama
authors: Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors: Yousuke
authors: Y
authors: Nakai
authors: Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors: Tsuyoshi
authors: T
authors: Hamada
authors: Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors: Saburo
authors: S
authors: Matsubara
authors: Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors: Hirofumi
authors: H
authors: Kogure
authors: Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors: Kazuhiko
authors: K
authors: Koike
mesh_terms: D001652:Bile Ducts / Q000503:physiopathology*; D002779:Cholestasis / Q000503:physiopathology / Q000628:therapy*; D003251:Constriction, Pathologic / Q000503:physiopathology / Q000628:therapy; D005548:Foreign-Body Migration / Q000209:etiology; D006801:Humans; D008670:Metals; D015607:Stents / Q000009:adverse effects; D013314:Stress, Mechanical
chemical_list: D008670:Metals
keywords: Biliary stricture; Endoscopic treatment; Mechanical property; Self-expandable metallic stent