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Research Papers

A Computational Analysis of the Deformation of the Femoropopliteal Artery With Stenting

[+] Author and Article Information
Ríona Ní Ghriallais

Biomedical Engineering,
National University of Ireland,
Galway, Ireland
e-mail: riona.nighriallais@nuigalway.ie

Mark Bruzzi

Biomedical Engineering,
National University of Ireland,
Galway, Ireland

1Corresponding author.

Contributed by the Bioengineering Division of ASME for publication in the Journal of Biomechanical Engineering. Manuscript received October 7, 2013; final manuscript received March 20, 2014; accepted manuscript posted April 2, 2014; published online May 12, 2014. Assoc. Editor: Hai-Chao Han.

J Biomech Eng 136(7), 071003 (May 12, 2014) (10 pages) Paper No: BIO-13-1470; doi: 10.1115/1.4027329 History: Received October 07, 2013; Revised March 20, 2014; Accepted April 02, 2014

Physiological loads that act on the femoropopliteal artery, in combination with stenting, can lead to uncharacteristic deformations of the stented vessel. The overall goal of this study was to investigate the effect of stent length and stent location on the deformation characteristics of the superficial femoral artery (SFA) using an anatomically accurate, three-dimensional finite element model of the leg. For a range of different stent lengths and locations, the deformation characteristics (length change, curvature change, and axial twist) that result from physiological loading of the SFA along with the mechanical behavior of the vessel tissue are investigated. Results showed that stenting portions of the SFA leads to a change in global deformation characteristics of the vessel. Increased stress and strain values and altered deformation characteristics were observed in the various stented cases of this study, which are compared to previous results of an unstented vessel. The study concludes that shortening, twist and curvature characteristics of the stented vessel are dependent on stent length and stent location within the vessel.

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Figures

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Fig. 1

Finite element model of the leg and stented femoropopliteal artery: (a) the complete model, (b) outer soft tissue (skin) removed to reveal individual muscles, (c) outer skin and muscles removed to reveal the underlying bones and femoropopliteal artery, and (d) geometries of the six stented vessel models including three stent lengths (40 mm, 60 mm, and 90 mm) and three stent locations (distal SFA, mid SFA and proximal SFA).

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Fig. 2

Vessel shortening along the length of the vessel from proximal FP artery to distal FP artery for (a) stent length investigation and (b) stent location investigation

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Fig. 3

Deformation and von-Mises stress (MPa) contour plot of the (a) 40 mm, (b) 60 mm, (c) 90 mm, (d) proximal, (e) mid, and (f) distal stented artery model after knee flexion. Arrows indicate the ends of the stented portion where the stent lies between the arrows.

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Fig. 4

Deformation, von-Mises stress (MPa) and strain contour plots of the stented regions of the 40 mm, 60 mm, and 90 mm stented artery model after knee flexion. Arrows indicate the ends of the stented portion where the stent lies between the arrows.

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Fig. 5

Deformation, von-Mises stress (MPa) and strain contour plots of the stented regions of the stented regions of the distal, mid and proximal stented artery model after knee flexion. Arrows indicate the ends of the stented portion where the stent lies between the arrows.

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Fig. 6

Deformation of the unstented artery model with contour plot of von-Mises stress (MPa) and strain in the vessel after knee flexion [11].

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