J Dig Cancer Res.  2022 Dec;10(2):92-98. 10.52927/jdcr.2022.10.2.92.

Mechanical Property and Problems of the Self-expandable Metal Stent in Pancreaticobiliary Cancer

• Luangsukrerk T

• KMID: 2536426
• DOI: http://doi.org/10.52927/jdcr.2022.10.2.92

Abstract

Self-expandable metal stent (SEMS) is effective for biliary drainage, especially in pancreaticobiliary cancer. The mechanical properties, material, and design of SEMS are important in preventing recurrent biliary obstruction and complication. Radial and chronic expansion forces play roles in preventing stent migration and collapse. Complications, such as stent impaction, cholecystitis, and pancreatitis, were related to the axial force. The nickel–titanium alloy shows more flexibility, conformability, and optimal axial force compared to previously used stainless steel. Additionally, the stent structure affected the mechanical properties of SEMS. Therefore, understanding the mechanical properties, material, and design of SEMS will provide the best outcome for biliary drainage, as well as better SEMS development.

Keyword

Self expandable metal stents; Pancreatic neoplasms; Bile duct neoplasms; Mechanical properties; Recurrent biliary obstruction