Nonthrombogenic articles having enhanced albumin affinity
First Claim
1. A nonthrombogenic article adapted for use in contact with blood or blood products containing albumin, said article having on those surfaces which contact blood or blood products a water soluble, biocompatible, nonionic polymeric substrate having covalently attached thereon nonionic, aliphatic hydrocarbon extensions of 14 to 20 carbon atoms, the degree of aliphatic extension attachment effective to absorb albumin sufficient to retard thrombus formation on said surfaces.
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Accused Products
Abstract
Articles having reduced thrombogenicity when in contact with blood products containing albumin and methods of their use are provided. The articles comprise at the surface of blood contact a water insoluble polymeric substrate material having covalently attached thereon aliphatic extensions of 14 to 20 carbon units. When exposed to blood the aliphatic chain extensions provide a hydrophobic binding site for albumin. The articles when implemented with whole blood or blood products selectively enhance albumin affinity binding to the exclusion of other blood components, and subsequently minimize thrombus formation.
46 Citations
22 Claims
- 1. A nonthrombogenic article adapted for use in contact with blood or blood products containing albumin, said article having on those surfaces which contact blood or blood products a water soluble, biocompatible, nonionic polymeric substrate having covalently attached thereon nonionic, aliphatic hydrocarbon extensions of 14 to 20 carbon atoms, the degree of aliphatic extension attachment effective to absorb albumin sufficient to retard thrombus formation on said surfaces.
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11. A method for rendering nonthrombogenic at least one surface of article adapted for use in contact with bood or blood products containing albumin, comprising
establishing on said article surface a water insoluble biocompatible, nonionic polymer substrate having thereon abstractable hydrogen sites effective for covalent attachment, alkylating said substrate at said hydrogen sites with aliphatic hydrocarbon extensions of 14 to 20 carbon atoms, the degree of aliphatic extension attachment effective to provide a nonionic affinity binding site for an amount of albumin sufficient to retard thrombus formation on said surface.
Specification