Understanding the Mechanical forces of Self-Expandable Metal Stents in the Biliary Ducts

Hiroyuki Isayama; Yousuke Nakai; Tsuyoshi Hamada; Saburo Matsubara; Hirofumi Kogure; Kazuhiko Koike

doi:10.1007/s11894-016-0538-5

Understanding the Mechanical forces of Self-Expandable Metal Stents in the Biliary Ducts

Curr Gastroenterol Rep. 2016 Dec;18(12):64. doi: 10.1007/s11894-016-0538-5.

Authors

Hiroyuki Isayama¹, Yousuke Nakai², Tsuyoshi Hamada², Saburo Matsubara², Hirofumi Kogure², Kazuhiko Koike²

Affiliations

¹ 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.
² Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.

PMID: 27778304
DOI: 10.1007/s11894-016-0538-5

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.

Keywords: Biliary stricture; Endoscopic treatment; Mechanical property; Self-expandable metallic stent.

Publication types

Review

MeSH terms

Bile Ducts / physiopathology*
Cholestasis / physiopathology
Cholestasis / therapy*
Constriction, Pathologic / physiopathology
Constriction, Pathologic / therapy
Foreign-Body Migration / etiology
Humans
Metals
Stents* / adverse effects
Stress, Mechanical

Substances

Metals