Quantification of the passive mechanical properties of the resting platelet

Jason H. Haga, Armand J. Beaudoin, James G. White, John Strony

Research output: Contribution to journalArticle


Sudden coronary artery occlusion is one of the leading causes of death. Several in vitro models have been used to study the relationship between hemodynamic forces and platelet function. However, very few in vivo studies exist that fully explore this relationship due to the lack of rheologic data for the platelet. For this purpose, micropipette aspiration techniques were used in the present study to determine the mechanical properties of platelets. The data were analyzed by two mathematical models: (1) an erythrocyte-type membrane model which yielded a platelet shear modulus of 0.03 ±0.01 dyn cm-1 (mean±SD) and a viscous modulus of 0.12 ±0.04dyn s cm-1. (2) An endothelial-type cell model which approximated the platelet Young's modulus to be 1.7±0.6 × 103 dyn cm-2 with a viscous modulus of 1.0±0.5 × 104 dyn s cm-2. The endothelial-type cell model more accurately describes the mechanics occurring at the micropipette tip and permits more appropriate assumptions to be made in quantifying the rheologic properties of a platelet. Results from this study can be integrated into numerical models of blood flow in stenosed coronary arteries to elucidate the impact of locai hemodynamics on platelets and thrombus formation in coronary artery disease.

Original languageEnglish (US)
Pages (from-to)268-277
Number of pages10
JournalAnnals of Biomedical Engineering
Issue number2
StatePublished - 1998


  • Endothelial-type cell model
  • Erythrocyte-type membrane model
  • Shear modulus
  • Viscous modulus
  • Young's modulus

ASJC Scopus subject areas

  • Biomedical Engineering

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