Surface modification for coating
First Claim
Patent Images
1. A substrate, which comprises:
- a) a substrate composed of a material selected from the group consisting of silicone, polyether block amide (PEBA), polycarbonate and polyurethane, wherein the substrate has a surface;
b) a hydrophobic tie layer having opposed top and bottom tie layer surfaces and a surface contact angle greater than about 40°
, wherein the hydrophobic tie layer consists of a solvent and an unsaturated carboxylic acid amide at a concentration from about 0.1 to about 10 weight percent within the solvent; and
c) a biomimetic surfactant comprising an alkyl chain, wherein the hydrophobic tie layer is positioned between the substrate surface and the biomimetic surfactant; and
d) wherein the unsaturated carboxylic acid amide within the hydrophobic tie layer hydrophobically bonds to the alkyl chain of the biomimetic surfactant along the tie layer top surface and the unsaturated carboxylic acid amide hydrophobically bonds to the substrate surface along the tie layer bottom surface.
5 Assignments
0 Petitions
Accused Products
Abstract
A modified medical device substrate surface designed to improve adhesion of biomimetic surfactants to the medical device surface, thus reducing the risk of thrombosis is described. The surface modification is accomplished through either an application of a tie layer of a hydrophobic material on the substrate surface intermediate the biomimetic coating or through incorporation of a hydrophobic dopant in the polymeric substrate prior to extrusion or molding. Either method creates a hydrophobically modified surface that enhances the biomimetic surfactant bonding strength.
-
Citations
15 Claims
-
1. A substrate, which comprises:
-
a) a substrate composed of a material selected from the group consisting of silicone, polyether block amide (PEBA), polycarbonate and polyurethane, wherein the substrate has a surface; b) a hydrophobic tie layer having opposed top and bottom tie layer surfaces and a surface contact angle greater than about 40°
, wherein the hydrophobic tie layer consists of a solvent and an unsaturated carboxylic acid amide at a concentration from about 0.1 to about 10 weight percent within the solvent; andc) a biomimetic surfactant comprising an alkyl chain, wherein the hydrophobic tie layer is positioned between the substrate surface and the biomimetic surfactant; and d) wherein the unsaturated carboxylic acid amide within the hydrophobic tie layer hydrophobically bonds to the alkyl chain of the biomimetic surfactant along the tie layer top surface and the unsaturated carboxylic acid amide hydrophobically bonds to the substrate surface along the tie layer bottom surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for increasing the hydrophobicity of a substrate surface to enhance the adhesion of a biomimetic surfactant polymer to the substrate surface, the method comprising the steps of:
-
a) providing a substrate composed of a material selected from the group consisting of silicone, polyurethane, polyether block amide (PEBA), and polycarbonate, wherein the substrate has a substrate surface; b) providing a biomimetic surfactant polymer comprising an alkyl chain; c) providing a hydrophobic tie layer having opposed top and bottom hydrophobic tie layer surfaces, wherein the hydrophobic tie layer consisting of a solvent and an unsaturated carboxylic acid amide at a concentration ranging from about 0.1 to about 10 weight percent within the solvent; d) applying the bottom hydrophobic tie layer surface to the substrate surface to thereby create a surface contact angle greater than about 40°
;e) applying the biomimetic surfactant to the top polymer hydrophobic tie layer surface; and f) wherein the unsaturated carboxylic acid amide within the hydrophobic tie layer hydrophobically bonds to the substrate surface along the bottom hydrophobic tie layer surface and the unsaturated carboxylic acid amide within the hydrophobic tie layer hydrophobically bonds to the alkyl chain of the biomimetic surfactant polymer along the top hydrophobic tie layer surface. - View Dependent Claims (10, 11, 12, 13)
-
-
14. A substrate, which comprises:
-
a) a substrate composed of a material selected from the group consisting of silicone, polyether block amide (PEBA), polycarbonate and polyurethane, wherein the substrate has a surface; b) a hydrophobic tie layer having opposed top and bottom tie layer surfaces and a contact angle greater than 40°
, wherein the tie layer consists of a tetrahydrofuran solvent and erucamide at a concentration ranging from about 0.1 to about 10 weight percent the solvent;c) a biomimetic surfactant of poly(N-vinyl dextran aldonamide-co-N-vinyl hexanamide) comprising an alkyl chain, wherein the hydrophobic tie layer is positioned between the substrate surface and the biomimetic surfactant; and d) wherein the erucamide within the hydrophobic tie layer hydrophobically bonds with the substrate surface along the bottom tie layer surface; and e) wherein the erucamide within the hydrophobic tie layer hydrophobically bonds with the alkyl chain within the biomimetic surfactant along the top tie layer surface, thereby creating a hydrophobic bond therebetween the substrate surface and the biomimetic surfactant. - View Dependent Claims (15)
-
Specification