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KMID : 1038120230560050633
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Clinical Endoscopy
2023 Volume.56 No. 5 p.633 ~ p.649
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Evaluation of the mechanical properties of current biliary self-expandable metallic stents: axial and radial force, and axial force zero border
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Wataru Yamagata
Toshio Fujisawa
Takashi Sasaki
Rei Ishibashi
Tomotaka Saito
Shuntaro Yoshida
Shizuka No
Kouta Inoue
Yousuke Nakai
Naoki Sasahira
Hiroyuki Isayama
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Abstract
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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.
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KEYWORD
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Axial force, Cholestasis, Mechanical property, Radial force, Self-expandable metallic stent
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