Document Detail


Finite element methods to analyze helical stent expansion.
MedLine Citation:
PMID:  24123985     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Helical polymeric stents have been proposed as a suitable geometry for biodegradable drug-eluting polymer-based stents. However, helical stents often experience nonuniform local expansion (dog boning), which can prohibit full stent expansion using conventional methods. The development of stents and deployment methods is challenging and can be supported by numerical analysis; however, this complex problem is often approached with simplified boundary conditions that may not be appropriate for helical stents. The finite element method (explicit and implicit) was used to investigate three common stent expansion approaches with a focus on helical stent geometry, which differs from traditional wire mesh stent expansion. Although each of the three methods considered provided some insight into the expansion characteristics, common displacement controlled, and uniform expansion methods were not able to demonstrate the characteristic local deformations observed in expansion. A coupled stent-balloon model, although computationally expensive, was able to demonstrate the expected nonuniform deformation. To address nonuniform expansion, a progressive expansion approach has been investigated and verified numerically. This method may also provide a suitable solution for nonuniform expansion in other stent designs by minimizing loading and potential damage to the artery that can occur during stent deployment. Copyright © 2013 John Wiley & Sons, Ltd.
Authors:
Nasim Paryab; Duane S Cronin; Pearl Lee-Sullivan
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-10-9
Journal Detail:
Title:  International journal for numerical methods in biomedical engineering     Volume:  -     ISSN:  2040-7947     ISO Abbreviation:  Int j numer method biomed eng     Publication Date:  2013 Oct 
Date Detail:
Created Date:  2013-10-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101530293     Medline TA:  Int j numer method biomed eng     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 John Wiley & Sons, Ltd.
Affiliation:
University of Waterloo, Waterloo, Ontario, Canada.
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