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Albumin binding surfaces for biomaterials

J R Keogh1, J W Eaton

  • 1Medtronic, Inc., Minneapolis.

The Journal of Laboratory and Clinical Medicine
|October 1, 1994
PubMed
Summary
This summary is machine-generated.

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New medical device surfaces covalently modified with albumin-binding molecules significantly reduce blood clotting and bacterial adherence. These advanced biomaterials show promise for improved biocompatibility in implants and blood-contact applications.

Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Medical Device Engineering

Background:

  • Medical device surfaces can trigger blood clots and infections by adsorbing host proteins.
  • Previous attempts to create albumin-binding surfaces had limitations, leaving parts of the material unmodified.

Purpose of the Study:

  • To develop a novel polyetherurethane surface that preferentially binds albumin, thereby reducing adverse biological responses.
  • To enhance the biocompatibility of medical device materials for implantation and blood contact.

Main Methods:

  • Covalent surface modification of polyetherurethane using acrylamide, amino-propylmethacrylamide, dextran, and Cibacron blue.
  • Testing the modified surface's ability to bind albumin from plasma.
  • Assessing the material's effect on whole blood clotting and Staphylococcus epidermidis adherence.

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Main Results:

  • The derivatized polyurethane surface demonstrated preferential and reversible albumin binding from plasma.
  • The material inhibited blood clotting for over 16 hours, potentially via antithrombin III activation.
  • Surfaces, particularly those with bound albumin, significantly reduced Staphylococcus epidermidis adherence.

Conclusions:

  • Covalently modified albumin-affinity surfaces offer enhanced biocompatibility compared to previous methods.
  • These surfaces show potential for reducing thrombotic events and device-centered infections.
  • Albumin-binding surfaces represent a promising strategy for next-generation medical devices.