Drug-Eluting Stent Design is a Determinant of Drug Concentration at the Endothelial Cell Surface

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• 作者：Taewon Seo ; Antoine Lafont ; Sun-Young Choi…
• 关键词：Drug ; eluting stent ; Endothelial wound healing ; Convection–diffusion ; Wall shear stress ; Flow disturbance ; Computational simulations
• 刊名：Annals of Biomedical Engineering
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：44
• 期：2
• 页码：302-314
• 全文大小：1,266 KB
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• 作者单位：Taewon Seo (1)
  Antoine Lafont (2) (3)
  Sun-Young Choi (4)
  Abdul I. Barakat (3)
  
  1. School of Mechanical Engineering, Andong National University, Andong, Korea
  2. Department of Cardiology, European Georges Pompidou Hospital, University of Paris-Descartes, Paris, France
  3. Hydrodynamics Laboratory (LadHyX), CNRS UMR7646, Ecole Polytechnique, Route de Saclay, 91128, Palaiseau Cedex, France
  4. Department of Radiology and Medical Research Institute, School of Medicine, Ewha Womans University, Seoul, Korea
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Biomedicine
  Biomedical Engineering
  Biophysics and Biomedical Physics
  Mechanics
  Biochemistry
  
• 出版者：Springer Netherlands
• ISSN：1573-9686

文摘

Although drug-eluting stents (DES) have greatly reduced arterial restenosis, there are persistent concerns about stent thrombosis. DES thrombosis is attributable to retarded vascular re-endothelialization due to both stent-induced flow disturbance and the inhibition by the eluted drug of endothelial cell proliferation and migration. The present computational study aims to determine the effect of DES design on both stent-induced flow disturbance and the concentration of eluted drug at the arterial luminal surface. To this end, we consider three closed-cell stent designs that resemble certain commercial stents as well as three “idealized” stents that provide insight into the impact of specific characteristics of stent design. To objectively compare the different stents, we introduce the Stent Penalty Index (SPI), a dimensionless quantity whose value increases with both the extent of flow disturbance and luminal drug concentration. Our results show that among the three closed-cell designs studied, wide cell designs lead to lower SPI and are thus expected to have a less adverse effect on vascular re-endothelialization. For the idealized stent designs, a spiral stent provides favorable SPI values, whereas an intertwined ring stent leads to an elevated SPI. The present findings shed light onto the effect of stent design on the concentration of the eluted drug at the arterial luminal surface, an important consideration in the assessment of DES performance.