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Macroscopic Friction Coefficient Measurements on Living Endothelial Cells

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Abstract

Arterial stent deployment by balloon or self-expandable structure introduces shear forces and radial forces that can damage or remove the endothelial cell layer. These factors can subsequently cause failure by restenosis or endothelial leaks. These conditions can be exacerbated by pulsatile blood flow and arterial asymmetry, which can cause migration or displacement. In mechanical or finite-element models which attempt to explain this motion, friction between the stent materials and endothelial cells is eclipsed by pressure, or assumptions that cells are moved along with the stent. During device deployment or migration, some relative motion between stent materials and endothelial cells occurs. This study aims to quantify friction between a polished glass pin and a single layer of arterial endothelial cells, and include observations of cell damage in an attempt to better understand the biological response to tribological stresses. Measured friction coefficient values were on the order of μ = 0.03–0.06.

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Acknowledgements

The authors would like to acknowledge very helpful conversations regarding testing procedures and cell culturing with Prof. Roger Tran-Son-Tay, Prof. Malisa Sarntinoranont, and Jessica Cobb at the University of Florida.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA

    Alison C. Dunn & W. Gregory Sawyer

  2. J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA

    Toral D. Zaveri & Benjamin G. Keselowsky

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  1. Alison C. Dunn
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  2. Toral D. Zaveri
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  3. Benjamin G. Keselowsky
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  4. W. Gregory Sawyer
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Correspondence to W. Gregory Sawyer.

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Dunn, A.C., Zaveri, T.D., Keselowsky, B.G. et al. Macroscopic Friction Coefficient Measurements on Living Endothelial Cells. Tribol Lett 27, 233–238 (2007). https://doi.org/10.1007/s11249-007-9230-0

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  • DOI: https://doi.org/10.1007/s11249-007-9230-0

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