Evaluation of the mechanical properties of current biliary self-expandable metallic stents: axial and radial force, and axial force zero border
- Author:
Wataru YAMAGATA
1
;
Toshio FUJISAWA
;
Takashi SASAKI
;
Rei ISHIBASHI
;
Tomotaka SAITO
;
Shuntaro YOSHIDA
;
Shizuka NO
;
Kouta INOUE
;
Yousuke NAKAI
;
Naoki SASAHIRA
;
Hiroyuki ISAYAMA
Author Information
- Publication Type:Original Article
- From:Clinical Endoscopy 2023;56(5):633-649
- CountryRepublic of Korea
- Language:English
-
Abstract:
Background/Aims:Mechanical properties (MPs) and axial and radial force (AF and RF) may influence the efficacy and complications of self-expandable metallic stent (SEMS) placement. We measured the MPs of various SEMSs and examined their influence on the SEMS clinical ability.
Methods:We evaluated the MPs of 29 types of 10-mm SEMSs. RF was measured using a conventional measurement device. AF was measured using the conventional and new methods, and the correlation between the methods was evaluated.
Results:A high correlation in AFs was observed, as measured by the new and conventional manual methods. AF and RF scatterplots divided the SEMSs into three subgroups according to structure: hook-and-cross-type (low AF and RF), cross-type (high AF and low RF), and laser-cut-type (intermediate AF and high RF). The hook-and-cross-type had the largest axial force zero border (>20°), followed by the laser-cut and cross types.
Conclusions:MPs were related to stent structure. Hook-and-cross-type SEMSs had a low AF and high axial force zero border and were considered safest because they caused minimal stress on the biliary wall. However, the increase in RF must be overcome.
