Multilayer materials

US6623747B1 · kind B1 · utility

Assignee

• Novartis AG · CH

Inventors

• Ronald C. Chatelier · Cockatoo, AU
• Liming Dai · Beijing, CN
• Hans Griesser · Cockatoo, AU
• Sheng-Shing Li · Danbury, US
• Paul Zientek · Melbourne, AU
• Dieter Lohmann · Münchenstein, CH
• Peter Chabrecek · Clayton, AU

Key dates

• Filing date: Feb 14, 1996
• Grant date: Sep 23, 2003
• Expiry date: Feb 14, 2016

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61L27/34
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention is directed to a composite material, especially a biomedical device, e.g. an ophthalmic device, preferably a contact lens, with one or more wettable surfaces capable of holding a continous layer of aqueous fluid thereon which composite material comprises a bulk material and a hydrophilic coating characterized in that the hydrophilic coating consists of a carbohydrate attached covalently to reactive groups at the surface of the bulk material, either directly or via functional groups of an oligofunctional compound, said oligofunctional compound in turn having functional groups being capable of reacting with said reactive groups at the surface of the bulk material and with the carbohydrate, wherein said reactive groups are either inherently (a priori) present in the bulk material or wherein said reactive groups have been attached to the surface of the bulk material by a plasma surface preparation, as well as to a process of manufacture of such a composite material.