Hemodynamically Driven Stent Strut Design |
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Authors: | Juan M Jiménez and Peter F Davies |
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Institution: | (1) Institute for Medicine and Engineering, University of Pennsylvania, 1010 Vagelos Laboratories, 3340 Smith Walk, Philadelphia, PA 19104-6383, USA;(2) Department of Pathology and Laboratory Medicine, University of Pennsylvania, 1010 Vagelos Laboratories, 3340 Smith Walk, Philadelphia, PA 19104-6383, USA;(3) Department of Bioengineering, University of Pennsylvania, 1010 Vagelos Laboratories, 3340 Smith Walk, Philadelphia, PA 19104-6383, USA |
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Abstract: | Stents are deployed to physically reopen stenotic regions of arteries and to restore blood flow. However, inflammation and
localized stent thrombosis remain a risk for all current commercial stent designs. Computational fluid dynamics results predict
that nonstreamlined stent struts deployed at the arterial surface in contact with flowing blood, regardless of the strut height,
promote the creation of proximal and distal flow conditions that are characterized by flow recirculation, low flow (shear)
rates, and prolonged particle residence time. Furthermore, low shear rates yield an environment less conducive for endothelialization,
while local flow recirculation zones can serve as micro-reaction chambers where procoagulant and pro-inflammatory elements
from the blood and vessel wall accumulate. By merging aerodynamic theory with local hemodynamic conditions we propose a streamlined
stent strut design that promotes the development of a local flow field free of recirculation zones, which is predicted to
inhibit thrombosis and is more conducive for endothelialization. |
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Keywords: | Streamlined stent Stent strut design Hemodynamics Shear Endothelium Coagulation |
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