A method for investigating the mechanical properties of intracoronary stents using finite element numerical simulation

Tan, LB; Webb, David C.; Kormi, K.; Al-Hassani, S.T.S.

doi:10.1016/s0167-5273(00)00472-1

Cited by 52 publications

(29 citation statements)

References 11 publications

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“…5,6,8,20 However, there has been comparatively less study of stent flexibility. With the advent of radioactive 21,22,23 and drug-eluting stents, 2,10,18,19 which are superior to conventional stents in preventing restenosis, the improvement of the stent flexibility is the one of the most important subjects.…”

Section: Introductionmentioning

confidence: 99%

“…5,6,8,20 However, use of FEM for the investigation of the deformation mode in a bending stent or for the prediction of bending stiffness requires simulation of a complex three-dimensional model with a large number of nodes and elements and is technically demanding. Thus, the goal of the present study was to develop a testing and simulation method (e.g., the four-points bending test) for the evaluation of stent flexibility and structure.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Stent Structure on Stent Flexibility Measurements

Mori

Saito

2005

Ann Biomed Eng

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Adequate delivery and placement of intracoronary artery stents is dependent on various properties of the stent itself, including flexibility and high-radial strength. Although these properties can be assessed via determination of the bending stiffness and radial stiffness of a stent, the mesh structure of the stent does not lend easily to such measurements. The goal of the present study was to determine an optimal method for determining stent bending stiffness. The four-points bending test was used to evaluate stent flexibility, and the finite element method (FEM) was employed to assess the effect of stent structure on flexibility in stents with differing link structures. The four-points bending test yielded the following bending stiffness values: 85.28 N mm2 for the stent with an S-shaped link; 41.67 N mm2 for the stent with an N-shaped link; 78.79 N mm2 for the stent with a modified W-shaped link; and 188.67 N mm2 for the stent with a W-shaped link. The stent with the point symmetric link configuration (S-, N- and modified W-shaped link) had high flexibility. FEM analysis revealed that low flexibility resulted from interference between the struts at the compressive side. Further, the flexibility predicted from FEM analysis correlated with bending stiffness of the stents. We conclude that use of the four-points bending test yields information that is critical for the design of flexible stents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Stent Structure on Stent Flexibility Measurements

Mori

Saito

2005

Ann Biomed Eng

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“…To date, several studies have been carried out to investigate how geometrical properties, material properties and deployment methods affect the expansion characteristics of various stent designs (Whitcher 1997;Brauer et al 1999;Dumoulin and Cochelin 2000;Etave et al 2001;Tan et al 2001;Chua et al 2002Chua et al , 2003Chua et al , 2004aMigliavacca et al 2002Migliavacca et al , 2005Stolpmann et al 2003;McGarry et al 2004;Petrini et al 2004;Savage et al 2004;Gu et al 2005;Hall and Kasper 2006;Wang et al 2006;De Beule, Mortier, Belis et al 2007;De Beule et al 2008;Donnelly et al 2007;Wu et al 2007a;Xia et al 2007;Ju et al 2008;Lim et al 2008;Mortier et al 2008;Li et al 2009). A number of these studies which represent significant contributions to research in this field are discussed and summarised in this section (Table 1).…”

Section: Fe Analysis Of the Free Expansion Of Coronary Stentsmentioning

confidence: 99%

Computational structural modelling of coronary stent deployment: a review

Martín¹,

Boyle²

2011

Computer Methods in Biomechanics and Biomedical Engineering

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The finite element (FE) method is a powerful investigative tool in the field of biomedical engineering, particularly in the analysis of medical devices such as coronary stents whose performance is extremely difficult to evaluate in vivo. In recent years, a number of FE studies have been carried out to simulate the deployment of coronary stents, and the results of these studies have been utilised to assess and optimise the performance of these devices. The aim of this paper is to provide a thorough review of the state-of-the-art research in this area, discussing the aims, methods and conclusions drawn from a number of significant studies. It is intended that this paper will provide a valuable reference for future research in this area.

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“…In the literature, two types of biodegradable stent designs have been employed. The first designs were fiber braided [Welch 2008 andVaajanen 2003] and helical stents [Tan 2001 andSu 2003], which often exhibit low collapse pressure. The second type covers polymeric stent designs that mimic traditional metallic stent devices, such as common wire mesh structures Grabow 2005].…”

Section: Introductionmentioning

confidence: 99%

Finite element methods to analyze helical stent expansion

Paryab

Cronin

Lee‐Sullivan

2013

Numer Methods Biomed Eng

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SUMMARYHelical 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.

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A method for investigating the mechanical properties of intracoronary stents using finite element numerical simulation

Cited by 52 publications

References 11 publications

Effects of Stent Structure on Stent Flexibility Measurements

Effects of Stent Structure on Stent Flexibility Measurements

Computational structural modelling of coronary stent deployment: a review

Finite element methods to analyze helical stent expansion

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