論文

査読有り 責任著者
2020年4月7日

Computational modeling of braided-stent deployment for interpreting the mechanism of stent flattening

International Journal for Numerical Methods in Biomedical Engineering
  • Shunya Shiozaki
  • ,
  • Tomohiro Otani
  • ,
  • Soichiro Fujimura
  • ,
  • Hiroyuki Takao
  • ,
  • Shigeo Wada

記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1002/cnm.3335
出版者・発行元
Wiley

© 2020 John Wiley & Sons, Ltd. This study develops a computational model of the braided stent for interpreting the mechanism of stent flattening during deployment into curved arteries. Stent wires are expressed using Kirchhoff's rod theory and their mechanical behavior is treated using a corotational beam formulation. The equation of motion of the braided stent is solved in a step-by-step manner using the resultant elastic force and mechanical interactions of wires with friction. Examples of braided-stent deployment into idealized arteries with various curvatures are numerically simulated. In cases of low curvature, the braided stent expands from a catheter by releasing the bending energy stored in stent wires, while incomplete expansion is found at both stent ends (ie, the fish-mouth phenomenon), where relatively little bending energy is stored. In cases of high curvature, much torsional energy is stored in stent wires locally in the midsection of the curvature and the bending energy for stent self-expansion is not fully released even after deployment, leading to stent flattening. These findings suggest that the mechanical state of the braided stent and its transition during deployment play an important role in the underlying mechanism of stent flattening. Novelty Statement: This study developed a computational mechanical model of the braided stent for interpreting stent flattening, which is a critical issue observed during deployment into highly curved arteries. Mechanical behaviors of the stent wires are appropriately treated by corotational beam element formulation with considering multiple contacts. We conducted numerical examples of the stent deployment into curved arteries and found that the mechanical state of the braided stent during deployment associated with occurrences of the stent flattening. We believe this finding gives new insight into the mechanism of stent flattening and would advance the design of the stent and its deployment protocol.

リンク情報
DOI
https://doi.org/10.1002/cnm.3335
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/32212324
URL
http://onlinelibrary.wiley.com/wol1/doi/10.1002/cnm.3335/fullpdf
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85083259433&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85083259433&origin=inward
ID情報
  • DOI : 10.1002/cnm.3335
  • ISSN : 2040-7939
  • eISSN : 2040-7947
  • PubMed ID : 32212324
  • SCOPUS ID : 85083259433

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