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Investigation of Stent Implant Mechanics Using Linear Analytical and Computational Approach

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Abstract

Stent implants are essential in restoring normal blood flow in atherosclerotic arteries. Recent studies have shown high failure rates of stent implants in superficial femoral artery (SFA) as a result of dynamic loading environment imposed on the stent implants by the diseased arterial wall and turbulent blood flow. There are variety of stent designs and materials currently on the market however, there is no clear understanding if specific stent design is suitable with the material that is manufactured from and if this combination can sustain the life-cycle that the stent implants need to undergo once inside the artery. Lack of studies have been presented that relate stent mechanical properties with stent geometry and material used. This study presents linear theoretical and computational modeling approach that determines stent mechanical properties with effective stiffness of the deployed stent. Effective stiffness of the stent has been accurately derived based on stent structure design and loading in axial and radial directions. A rhombus stent structure was selected for this study due to its more common use and produced by main stream manufacturers. The derived theoretical model was validated using numerical finite element modeling approach. Results from this study can lead to preliminary insight towards understanding of stent deformation based on stent geometry, material properties and artery wall pressure; and how to carefully match stent’s geometry with suitable material for long life cycle, increased strength, and reliable performance of stent implants.

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Acknowledgments

This work was supported by internal funds from UNT. We thank the team at UTSW Medical Center for providing valuable feedback and stent samples for analyses.

Conflict of interest

The authors whose names are listed in this manuscript certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.

Statement of human studies

No human studies were carried out by the authors for this article.

Statement of animal studies

No animal studies were carried out by the authors for this article.

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Authors and Affiliations

  1. Mechanical and Energy Engineering Department, College of Engineering, University of North Texas, Denton, TX, 76207, USA

    Hua Yang, Aleksandra Fortier & Kyle Horne

  2. Department of Internal Medicine, UT Southwestern Medical Center and VA North Texas Health Care System, Dallas, TX, 75390, USA

    Atif Mohammad & Subhash Banerjee

  3. Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA

    Hai-Chao Han

Authors
  1. Hua Yang
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  2. Aleksandra Fortier
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  3. Kyle Horne
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  4. Atif Mohammad
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  5. Subhash Banerjee
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  6. Hai-Chao Han
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Corresponding author

Correspondence to Aleksandra Fortier.

Additional information

Associate Editors Wei Sun and Ajit P. Yoganathan oversaw the review of this article.

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Yang, H., Fortier, A., Horne, K. et al. Investigation of Stent Implant Mechanics Using Linear Analytical and Computational Approach. Cardiovasc Eng Tech 8, 81–90 (2017). https://doi.org/10.1007/s13239-017-0295-0

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  • DOI: https://doi.org/10.1007/s13239-017-0295-0

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