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Novel characteristics of traction force in biliary self‐expandable metallic stents
Author(s) -
Hori Yasuki,
Hayashi Kazuki,
Yoshida Michihiro,
Naitoh Itaru,
Ban Tesshin,
Miyabe Katsuyuki,
Kondo Hiromu,
Nishi Yuji,
Umemura Shuichiro,
Fujita Yasuaki,
Natsume Makoto,
Kato Akihisa,
Ohara Hirotaka,
Joh Takashi
Publication year - 2017
Publication title -
digestive endoscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.5
H-Index - 56
eISSN - 1443-1661
pISSN - 0915-5635
DOI - 10.1111/den.12796
Subject(s) - traction (geology) , tractive force , medicine , surgery , mechanical engineering , engineering
Background and Aim In recent years, knowledge concerning the mechanical properties of self‐expandable metallic stents ( SEMS ) has increased. In a previous study, we defined traction force and traction momentum and reported that these characteristics are important for optimal stent deployment. However, traction force and traction momentum were represented as relative values and were not evaluated in various conditions. The purpose of the present study was to measure traction force in various situations assumed during SEMS placement. Methods Traction force and traction momentum were measured in non‐stricture, stricture, and angled stricture models using in‐house equipment. Results Stricture and angled stricture models had significantly higher traction force and traction momentum than those of the non‐stricture model (stricture vs non‐stricture: traction force, 7.2 N vs 1.4 N, P < 0.001; traction momentum, 237.8 Ns vs 62.3 Ns, P = 0.001; angled stricture vs non‐stricture: traction force, 7.4 N vs 1.4 N, P < 0.001; traction momentum, 307.2 Ns vs 62.3 Ns, P < 0.001). Traction force was variable during SEMS placement and was categorized into five different stages, which were similar in both the stricture and angled stricture models. Conclusions We measured traction force and traction momentum under simulated clinical conditions and demonstrated that strictures and the angular positioning of the stent influenced the traction force. Clinicians should be aware of the transition of the traction force and should schedule X‐ray imaging during SEMS placement.