Document Detail


Mechanical behaviour modelling of balloon-expandable stents.
MedLine Citation:
PMID:  10940405     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Endoprostheses are small struts placed by intravascular way to restore the vascular lumen and flow conditions. The purpose of this work is to provide models for evaluation and characterisation of some mechanical properties of a balloon-expandable stent by using the finite element method. Here we present the results for a metallic tubular peripheral prosthesis: the P308 Palmaz stent. We focus on the mechanisms linked to the structure expansion and its long-term behaviour. Several models are constructed in order to determine the stent shape after dilation and to assess the stress and strain fields in its wall due to this transformation. They inform us about the shortening percentage on expansion, degrees of radial and longitudinal recoil, and weaknesses of the structure. Various methods, differing in their levels of complexity, are then attempted to exhibit the predominant factors responsible for the crushing of a stent under external pressure. Moreover, the sensitivity of this critical pressure to geometric imperfections is studied. Lastly, since this kind of material is implanted for a lifetime, we test the stent with regard to fatigue life. Beyond safety considerations, this type of characterisation provides mechanical properties that are often difficult to obtain by experiments. If it was available for various stents, such information could be used to choose the appropriate prosthesis for specific applications. Moreover, confronted with observations from practitioners, they might lead to a better understanding of the failure or success of a particular design and to work on the product optimisation.
Authors:
C Dumoulin; B Cochelin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomechanics     Volume:  33     ISSN:  0021-9290     ISO Abbreviation:  J Biomech     Publication Date:  2000 Nov 
Date Detail:
Created Date:  2000-12-11     Completed Date:  2000-12-11     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0157375     Medline TA:  J Biomech     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1461-70     Citation Subset:  IM    
Affiliation:
Laboratoire de Mécanique et d'Acoustique CNRS UPR 7051, Ecole Supérieure de Mécanique de Marseille, I.M.T, Technopôle de Chateau Gombert, 13451 20, Marseille Cedex, France. dumoulin@imtumm.imt-mrs.fr
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MeSH Terms
Descriptor/Qualifier:
Angioplasty, Balloon
Biomechanics
Blood Vessel Prosthesis*
Humans
Models, Cardiovascular*
Prosthesis Design
Stents*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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