Patent ID: 8287890

Claim:
A hydrophilic, lubricious coating for a substrate, comprising: a first hydrophilic, lubricious coating layer selected from the group consisting of a cross-linked polyurethane and a poly(ethylene oxide) or a cross-linked polyurea and a poly(ethylene oxide), wherein the polyurethane is formed by reacting an isocyanate and a polyol and the polyurea is formed by reacting an isocyanate and a polyamine; and a second hydrophilic, lubricious coating layer selected from the group consisting of a cross-linked polyurethane and a polyvinylpyrrolidone or a cross-linked polyurea and a polyvinylpyrrolidone, wherein the polyurethane is formed by reacting an isocyanate and a polyol and the polyurea is formed by reacting an isocyanate and a polyamine; wherein the first coating layer is covered by the second coating layer and the second coating layer interpenetrates the first coating layer.