Computational structural modelling of coronary stent deployment: a review

Martín, David; Boyle, Fergal J.

doi:10.1080/10255841003766845

Cited by 72 publications

(39 citation statements)

References 77 publications

(79 reference statements)

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“…6 Computational numerical methods are powerful tools used in the assessment of stent design and performance. 7,8 A number of studies have utilized the finite element method (FEM) to investigate the structural properties of stents and their biomechanical impacts on the coronary artery during stent expansion. [9][10][11][12][13][14] These studies mainly focus on research in which arterial tapering was not a factor, either through simplifying assumptions or by modeling specific, nontapered arteries.…”

Section: Introductionmentioning

confidence: 99%

Balloon-Expandable Stents Expansion in Tapered Vessels and Their Interactions

Shen

Xie

Sun

et al. 2014

J. Mech. Med. Biol.

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In-stent restenosis (ISR) after stent implantation, especially in tapered vessels, remains an obstacle in the long-term benefits of stenting. In the present study, a finite element method (FEM) was employed to investigate the expansion process of balloon-expandable stents in tapered vessels (the TV model) and their interactions. For comparison, a numerical model of the same stent deployment in a straight vessel was also investigated. Results showed that in the TV model, the peak tissue stresses took place at the distal end of the tapered vessel. The node displacements of the stent's proximal and distal ends remained consistent before the stent contacted the tapered vessel, while the proximal end was larger than the distal end after the stent contacted the tapered vessel. The regions of maximum stresses in the stent after expansion were concentrated in the corners of the diamond cells of the stent's proximal end. The investigation provided some interpretations of the clinical observations in tapered vessels and also provided stent design proposals for tapered vessels. The FEM quantified the mechanical properties of stents in tapered vessels, and can help clinicians select appropriate stents, assist designers in pretests and create new stents made especially for tapered vessels.

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Section: Introductionmentioning

confidence: 99%

Balloon-Expandable Stents Expansion in Tapered Vessels and Their Interactions

Shen

Xie

Sun

et al. 2014

J. Mech. Med. Biol.

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“…Others have used high levels of detail including full three-dimensionality and models for a complete balloon delivery system and a diseased artery with contact interactions between balloon, stent and tissue. 19,39 In addition to the review by Martin and Boyle, 31 Migliavacca et al 32 provided a succinct overview of early FEA studies of stent behaviour and performance. Notable among them was the two-dimensional study by Rogers et al 40 who focussed on the need to minimise vascular injury during stenting.…”

Section: Fea and Structural Optimalitymentioning

confidence: 98%

Design Optimisation of Coronary Artery Stent Systems

2015

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In recent years, advances in computing power and computational methods have made it possible to perform detailed simulations of the coronary artery stenting procedure and of related virtual tests of performance (including fatigue resistance, corrosion and haemodynamic disturbance). Simultaneously, there has been a growth in systematic computational optimisation studies, largely exploiting the suitability of surrogate modelling methods to time-consuming simulations. To date, systematic optimisation has focussed on stent shape optimisation and has re-affirmed the complexity of the multi-disciplinary, multi-objective problem at hand. Also, surrogate modelling has predominantly involved the method of Kriging. Interestingly, though, optimisation tools, particularly those associated with Kriging, haven't been used as efficiently as they could have been. This has especially been the case with the way that Kriging predictor functions have been updated during the search for optimal designs. Nonetheless, the potential for future, carefully posed, optimisation strategies has been suitably demonstrated, as described in this review.

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“…Since 1990, an ever increasing demand for endovascular stents has led to significant advancements in the field of analysis, modelling and design of stent implants (Chua et al, 2002;Duerig et al, 1999;Martin and Boyle, 2010;Petrini et al, 2004;Migliavacca et al, 2002;Lim et al, 2008;Lally et al, 2005;Timmins et al, 2007;Bedoya et al, 2006;Wang and Masood, 2006). The results of these studies have shown that besides mechanobiological factors, the geometry and typology of a stent are crucial aspects governing the device function.…”

Section: Introductionmentioning

confidence: 95%

Shape optimization of stress concentration-free lattice for self-expandable Nitinol stent-grafts

Abad

Pasini

Cecere

2012

Journal of Biomechanics

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In a mechanical component, stress-concentration is one of the factors contributing to reduce fatigue life. This paper presents a design methodology based on shape optimization to improve the fatigue safety factor and increase the radial stiffness of Nitinol self-expandable stent-grafts. A planar lattice free of stress concentrators is proposed for the synthesis of a stent with smooth cell shapes. Design optimization is systematically applied to minimize the curvature and reduce the bending strain of the elements defining the lattice cells. A novel cell geometry with improved fatigue life and radial supportive force is introduced for Nitinol self-expandable stent-grafts used for treating abdominal aortic aneurism. A parametric study comparing the optimized stent-graft to recent stent designs demonstrates that the former exhibits a superior anchoring performance and a reduction of the risk of fatigue failure.

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Computational structural modelling of coronary stent deployment: a review

Cited by 72 publications

References 77 publications

Balloon-Expandable Stents Expansion in Tapered Vessels and Their Interactions

Balloon-Expandable Stents Expansion in Tapered Vessels and Their Interactions

Design Optimisation of Coronary Artery Stent Systems

Shape optimization of stress concentration-free lattice for self-expandable Nitinol stent-grafts

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