Antimicrobial material and method for making the same
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United States of America Patent
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May 8, 2012
Grant Date -
Nov 24, 2011
app pub date -
Jul 7, 2011
filing date -
Jan 22, 2008
priority date (Note) -
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Abstract
This invention provides a modified catheter biomaterial that provides both immediate, and long-term microbiocidal effects on otherwise antibiotic-resistant strains of microorganisms. The material, which exhibits good mechanical performance characteristics for medical devices, is composed of a hydrophobic polyurethane (PU), a hydrophilic polyethylene vinyl acetate (PEVA), a soluble silver salt and a sparsely-soluble silver salt. The hydrophobic polyurethane provides the good physical properties, the PEVA the hydrophilicity necessary to allow some water ingress into the catheter, the soluble silver salt for an immediate burst effect, and the sparsely-soluble silver salt for sustained-release over many months postimplantation.
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