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Biomechanical Challenges to Polymeric Biodegradable Stents

  • Medical Stents: State of the Art and Future Directions
  • Published:
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Abstract

Biodegradable implants have demonstrated clinical success in simple applications (e.g., absorbable sutures) and have shown great potential in many other areas of interventional medicine, such as localized drug delivery, engineered tissue scaffolding, and structural implants. For endovascular stenting and musculoskeletal applications, they can serve as temporary mechanical support that provides a smooth stress-transfer from the degradable implant to the healing tissue. However, for more complex device geometries, in vivo environments, and evolving load-bearing functions, such as required for vascular stents, there are considerable challenges associated with the use of biodegradable materials. A biodegradable stent must restore blood flow and provide support for a predictable appropriate period to facilitate artery healing, and subsequently, fail safely and be absorbed in a controllable manner. Biodegradable polymers are typically weaker than metals currently employed to construct stents, so it is difficult to ensure sufficient strength to keep the artery open and alleviate symptoms acutely while keeping other design parameters within clinically acceptable ranges. These design challenges are serious, given the general lack of understanding of biodegradable polymer behavior and evolution in intimal operating conditions. The modus operandi is mainly empirical and relies heavily on trial-and-error methodologies burdened by difficult, resource-expensive, and time-consuming experiments. We are striving for theoretical advancements systematizing the empirical knowledge into rational frameworks that could be cast into in silico tools for simulation and product development optimization. These challenges are evident when one considers that there are no biodegradable stents on the US market despite more than 30 years of development efforts (and currently only a couple with CE mark). This review summarizes previous efforts at implementing biodegradable stents, discusses the specific challenges involved, and presents recently developed material-modeling frameworks that can benefit this exciting field.

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Acknowledgements

We thank and acknowledge the constructive suggestions made by two anonymous reviewers and the effort made by the three associate editors of the present special issue.

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  1. Center for Cardiovascular Simulation, Institute for Computational Engineering and Sciences, University of Texas at Austin, 201 East 24th Street, Austin, TX, 78712-1229, USA

    Joao S. Soares

  2. Department of Bioengineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

    James E. Moore Jr.

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Correspondence to Joao S. Soares.

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Associate Editor Peter McHugh oversaw the review of this article.

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Soares, J.S., Moore, J.E. Biomechanical Challenges to Polymeric Biodegradable Stents. Ann Biomed Eng 44, 560–579 (2016). https://doi.org/10.1007/s10439-015-1477-2

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