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Related Experiment Videos

Plasma and platelet skimming at T-junctions.

J Perkkiö, L J Wurzinger, H Schmid-Schönbein

    Thrombosis Research
    |March 1, 1987
    PubMed
    Summary

    Microfluidic T-shaped bifurcations show unexpected platelet enrichment in side channels, contrary to plasma skimming effects on erythrocytes. Erythrocyte aggregation influences plasma layer thickness in microchannels.

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    Area of Science:

    • Biomedical Engineering
    • Microfluidics
    • Hematology

    Background:

    • Understanding blood component separation is crucial for diagnostics and therapies.
    • Plasma skimming typically reduces erythrocyte concentration in side branches.
    • Platelet behavior in microfluidic bifurcations requires further investigation.

    Purpose of the Study:

    • To investigate the separation of plasma, erythrocytes, and platelets in microfluidic T-shaped bifurcations.
    • To analyze the concentration of erythrocytes and platelets in side channels compared to the main channel.
    • To determine factors influencing plasma layer thickness.

    Main Methods:

    • Utilized a casting technique to create T-shaped bifurcations with 100 and 200-micron channel diameters.
    • Collected small blood samples (approx. 20 microliters) from side channels.
    • Measured erythrocyte and platelet concentrations and compared them to reservoir values.

    Main Results:

    • Observed a relative enrichment of platelets in the side branch.
    • Contrary to plasma skimming, erythrocyte concentration was reduced in the side branch.
    • Plasma layer thickness in the main channel was dependent on erythrocyte aggregation tendency at specific Reynolds numbers (around 0.3).

    Conclusions:

    • Microfluidic bifurcations exhibit complex flow dynamics affecting blood component distribution.
    • Platelet behavior in microchannels differs significantly from erythrocyte behavior.
    • Erythrocyte aggregation is a key factor in plasma layer dynamics within microfluidic systems.

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