Macroscopic friction coefficient measurements on living endothelial cells

Alison C. Dunn, Toral D. Zaveri, Benjamin G. Keselowsky, W. Gregory Sawyer

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)233-238
Number of pages6
JournalTribology Letters
Volume27
Issue number2
DOIs
StatePublished - Aug 1 2007
Externally publishedYes

Keywords

  • Biotribology
  • Cells
  • Stent

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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