The interest in biodegradable polymers for clinical and biomedical engineering applications has seen a dramatic increase in the last 10 years. Recent innovations include bioresorbable polymeric stents (BPS), which are temporary vascular scaffolds designed to restore patency and provide short-term support to a blocked blood vessel, before becoming naturally resorbed over time. BPS offer possibilities to overcome the long-term complications often observed with the permanent metallic stents, well established in the treatment of coronary and peripheral artery disease. From the perspective of designing next generation BPS, the bulk degradation behavior of the polymer material adds considerable complications. Computational modeling offers an efficient framework to predict and provide understanding into the behavior of medical devices and implants. Current computational modeling techniques for the degradation of BPS are either phenomenologically or physically based. In this work, a physically based polymer degradation model is implemented into a number of different computational frameworks to investigate the degradation of a number of polymeric structures. A thermal analogy is presented to implement the degradation model into the commercially available finite-element code, abaqus/standard. This approach is then applied to the degradation of BPS, and the effects of material, boundary condition, and design on the degradation rates of the stents are examined. The results indicate that there is a notable difference in the molecular weight trends predicted for the different materials and boundary condition assumptions investigated, with autocatalysis emerging as a dominant mechanism controlling the degradation behavior. Insights into the scaffolding ability of the various BPS examined are then obtained using a suggested general relationship between Young's modulus and molecular weight.
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June 2017
Research-Article
Modeling of Biodegradable Polyesters With Applications to Coronary Stents
Rosa Shine,
Rosa Shine
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: r.shine2@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: r.shine2@nuigalway.ie
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Reyhaneh Neghabat Shirazi,
Reyhaneh Neghabat Shirazi
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: reyhaneh.shirazi@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: reyhaneh.shirazi@nuigalway.ie
Search for other works by this author on:
William Ronan,
William Ronan
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: william.ronan@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: william.ronan@nuigalway.ie
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Caoimhe A. Sweeney,
Caoimhe A. Sweeney
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: caoimhe.a.sweeney@gmail.com
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: caoimhe.a.sweeney@gmail.com
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Nicola Kelly,
Nicola Kelly
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: nicola.kelly@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: nicola.kelly@nuigalway.ie
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Yury A. Rochev,
Yury A. Rochev
National Centre for Biomedical
Engineering Science (NCBES),
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: yury.rochev@nuigalway.ie
Engineering Science (NCBES),
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: yury.rochev@nuigalway.ie
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Peter E. McHugh
Peter E. McHugh
Professor
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: peter.mchugh@nuigalway.ie
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: peter.mchugh@nuigalway.ie
Search for other works by this author on:
Rosa Shine
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: r.shine2@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: r.shine2@nuigalway.ie
Reyhaneh Neghabat Shirazi
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: reyhaneh.shirazi@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: reyhaneh.shirazi@nuigalway.ie
William Ronan
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: william.ronan@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: william.ronan@nuigalway.ie
Caoimhe A. Sweeney
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: caoimhe.a.sweeney@gmail.com
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: caoimhe.a.sweeney@gmail.com
Nicola Kelly
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: nicola.kelly@nuigalway.ie
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: nicola.kelly@nuigalway.ie
Yury A. Rochev
National Centre for Biomedical
Engineering Science (NCBES),
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: yury.rochev@nuigalway.ie
Engineering Science (NCBES),
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: yury.rochev@nuigalway.ie
Peter E. McHugh
Professor
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: peter.mchugh@nuigalway.ie
Biomechanics Research Centre (BMEC),
Biomedical Engineering,
National University of Ireland Galway,
University Road,
Galway H91 HX31, Ireland
e-mail: peter.mchugh@nuigalway.ie
1Corresponding author.
Manuscript received July 5, 2016; final manuscript received January 5, 2017; published online May 3, 2017. Assoc. Editor: Marc Horner.
J. Med. Devices. Jun 2017, 11(2): 021007 (12 pages)
Published Online: May 3, 2017
Article history
Received:
July 5, 2016
Revised:
January 5, 2017
Citation
Shine, R., Neghabat Shirazi, R., Ronan, W., Sweeney, C. A., Kelly, N., Rochev, Y. A., and McHugh, P. E. (May 3, 2017). "Modeling of Biodegradable Polyesters With Applications to Coronary Stents." ASME. J. Med. Devices. June 2017; 11(2): 021007. https://doi.org/10.1115/1.4035723
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