Method for Ionically Cross-Linking Polysaccharide Material for Thin Film Applications and Products Produced Therefrom
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United States of America Patent
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Issued Date -
Jun 7, 2007
app pub date -
Nov 30, 2006
filing date -
Dec 1, 2005
priority date (Note) -
Abandoned
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Abstract
A method for producing ionically cross-linked polysaccharide material (e.g. pectin) that includes dissolving the material in a first liquid solution that includes a dissolving liquid. The first liquid solution is applied to a workpiece to form a polysaccharide-based coating on the workpiece. The coating is dried to remove a substantial portion of the dissolving liquid. Subsequent to drying, the coating is exposed to a second liquid solution that includes a compound that promotes ionic cross-linking of the polysaccharide-based coating. In the preferred embodiment, the dissolving liquid comprises water and possibly a polar solvent. The ionic cross-linking compound preferably comprises a divalent cation such as calcium (Ca.sup.2+), or possibly strontium (Sr.sup.2+), magnesium (Mg.sup.2+), barium (Ba.sup.2+), or other multivalent ions. Such a method forms a uniform ionically cross-linked film and/or coating for diverse applications, including medical devices such as implantable vascular grafts, stent-grafts and/or stents.
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