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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
Published on: October 27, 2009
Shear-induced platelet margination in a microchannel.
1Department of Mechanical Engineering, Stanford University, Stanford, California, USA.
Summary
Platelets migrate in microchannels due to red blood cell interactions. Their movement is diffusional and depends on red blood cell deformation, particularly at low capillary numbers.
Area of Science:
- Biophysics
- Fluid Dynamics
- Hematology
Background:
- Platelet aggregation and margination are critical in hemostasis and thrombosis.
- Understanding cellular flow dynamics in microcirculation is essential for diagnosing and treating vascular diseases.
Purpose of the Study:
- To numerically investigate the lateral migration of platelets within a microchannel.
- To elucidate the physical mechanisms driving platelet migration, focusing on hydrodynamic interactions.
Main Methods:
- Utilized Stokes flow boundary integral equations to resolve hydrodynamic interactions.
- Performed numerical simulations of red blood cells, platelets, and vessel walls.
Main Results:
- Observed expulsion of platelets from the core flow towards the cell-depleted layer.
- Demonstrated that platelet migration is a diffusional process.
- Showed diffusivity scales sublinearly with shear rate for capillary numbers less than 1.
Conclusions:
- Hydrodynamic interactions and velocity fluctuations govern platelet migration.
- Red blood cell deformation is a key factor influencing platelet diffusivity, especially in low capillary number regimes.
