Coating having biological activity and medical implant having surface carrying the same and method
First Claim
1. A method for treating a medical device having at least one surface exposed to tissue and/or blood comprising plasma cleaning said one surface with a gaseous plasma process utilizing radio frequency energy to ablate said one surface, wherein the gas used in said plasma cleaning process consists essentially of oxygen, a mixture of oxygen with argon or nitrogen, or air, functionalizing said one surface after said one surface has been cleaned with a plasma deposition to provide a plasma-deposited layer having functional groups and subjecting said plasma-deposited layer to multifunctional liners/spacers in a wet chemical treatment to form covalent bonds between the linkers/spacers and the functional groups of the plasma-deposited layer to provide a durable coating covalently bound to said one surface of the substrate.
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Accused Products
Abstract
A multi-step method for surface modification of a medical device having at least one surface exposed to tissue and/or blood. The steps comprise a low temperature plasma treatment of the said surface to provide a plasma deposited layer having functional groups. A chemical treatment of the plasma deposited layer using multifunctional linkers establishes covalent bonds with the plasma deposited layer. A bioactive/biocompatible agent react with the multifunctional linkers so that molecules thereof are covalently bound to said surface.
120 Citations
22 Claims
- 1. A method for treating a medical device having at least one surface exposed to tissue and/or blood comprising plasma cleaning said one surface with a gaseous plasma process utilizing radio frequency energy to ablate said one surface, wherein the gas used in said plasma cleaning process consists essentially of oxygen, a mixture of oxygen with argon or nitrogen, or air, functionalizing said one surface after said one surface has been cleaned with a plasma deposition to provide a plasma-deposited layer having functional groups and subjecting said plasma-deposited layer to multifunctional liners/spacers in a wet chemical treatment to form covalent bonds between the linkers/spacers and the functional groups of the plasma-deposited layer to provide a durable coating covalently bound to said one surface of the substrate.
Specification