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Related Experiment Videos

Relationship between release rate and surface concentration for heparinized materials.

D Basmadjian, M V Sefton

    Journal of Biomedical Materials Research
    |May 1, 1983
    PubMed
    Summary
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    Mathematical models predict heparin release rates. A higher rate (4 X 10(-2) µg/cm2 min) creates a protective heparin microenvironment, while a lower rate does not.

    Area of Science:

    • Biomaterials Science
    • Chemical Engineering
    • Pharmacokinetics

    Background:

    • Heparin is crucial for preventing thrombosis.
    • Understanding heparin release kinetics is vital for biomaterial efficacy.
    • Heparin-PVA hydrogels are used in medical devices.

    Purpose of the Study:

    • To model heparin surface concentrations from different release rates.
    • To determine the minimum effective heparin release rate for antithrombotic effect.
    • To evaluate the contribution of heparin microenvironment for heparin-PVA hydrogels.

    Main Methods:

    • Development of mathematical models for heparin release.
    • Simulation of heparin elution into flowing blood and stagnant/well-mixed plasma.
    • Calculation of surface concentrations at varying release rates and conditions.

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    Main Results:

    • A release rate of 4 X 10(-2) µg/cm2 min rapidly achieves critical heparin concentrations (0.5 µg/mL in blood, 0.2 µg/mL in plasma).
    • A lower release rate (3 X 10(-5) µg/cm2 min) requires extensive distances or times to reach critical concentrations.
    • The lower release rate from heparin-PVA hydrogels is insufficient to create an antithrombotic heparin microenvironment.

    Conclusions:

    • The release rate of 4 X 10(-2) µg/cm2 min is a sufficient minimum for an antithrombotic heparin microenvironment.
    • Heparin-PVA hydrogels likely do not exert biological activity via a heparin microenvironment.
    • The developed mathematical models are applicable to predicting surface concentrations for various released materials.