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Toshio Fujisawa 1 Article
Evaluation of the mechanical properties of current biliary self-expandable metallic stents: axial and radial force, and axial force zero border
Wataru Yamagata, Toshio Fujisawa, Takashi Sasaki, Rei Ishibashi, Tomotaka Saito, Shuntaro Yoshida, Shizuka No, Kouta Inoue, Yousuke Nakai, Naoki Sasahira, Hiroyuki Isayama
Clin Endosc 2023;56(5):633-649.   Published online April 10, 2023
DOI: https://doi.org/10.5946/ce.2022.201
Graphical AbstractGraphical Abstract AbstractAbstract PDFPubReaderePub
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.

Citations

Citations to this article as recorded by  
  • Characteristics of four commonly used self-expanding biliary stents: an in vitro study
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    DEN Open.2024;[Epub]     CrossRef
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    Physical and Engineering Sciences in Medicine.2024;[Epub]     CrossRef
  • Understanding mechanical properties of biliary metal stents for wise stent selection
    Seok Jeong
    Clinical Endoscopy.2023; 56(5): 592.     CrossRef
  • How to reduce fistula formation after self-expandable metallic stent insertion for treating malignant esophageal stricture?
    Kwang Bum Cho
    Clinical Endoscopy.2023; 56(6): 735.     CrossRef
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