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Related Experiment Videos

Photo induced surface heparin immobilization

Y Nakayama1, T Matsuda

  • 1Department of Bioengineering, National Cardiovascular Center Research Institute, Osaka, Japan.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 1, 1993
PubMed
Summary

This study presents a novel photochemical method for durable heparin immobilization on devices, enhancing antithrombogenicity for artificial organs. The technique uses UV light to create a stable heparin-hydrogel layer, preventing blood clots.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Surface Chemistry

Background:

  • Developing antithrombogenic surfaces is crucial for artificial organs.
  • Existing methods for heparin immobilization can lack durability and stability.
  • Photochemical approaches offer potential for controlled surface modification.

Purpose of the Study:

  • To develop a novel, durable method for immobilizing heparin onto fabricated devices using photochemistry.
  • To create heparin-bound hydrogels with enhanced antithrombogenic properties.
  • To demonstrate the efficacy of this method on poly(ethylene terephtalate) substrates.

Main Methods:

  • Utilized photochemistry involving a dithiocarbamate group that generates reactive radicals upon ultraviolet (UV) irradiation.
  • Coated a substrate with a mixture of a photoreactive polymer and heparin in an aqueous solution.
  • Applied UV irradiation to simultaneously form a hydrogel and chemically fix it to the substrate.

Main Results:

  • Achieved durable layering of heparin-immobilized hydrogels on fabricated devices.
  • Demonstrated successful heparin immobilization onto poly(ethylene terephtalate).
  • Observed significant inhibition of platelet adhesion and prolonged blood coagulation times, indicating potent antithrombogenicity.

Conclusions:

  • The developed photochemical method provides a robust and effective way to create antithrombogenic surfaces.
  • This technique is suitable for fabricating devices requiring enhanced biocompatibility, such as artificial organs.
  • The durable heparin immobilization is attributed to simultaneous hydrogel formation and chemical fixation via photochemistry.

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