Diffusion-controllable coatings on medical device

US6827966B2 · kind B2 · utility

Assignee

• Novartis AG · CH

Inventors

• Yongxing Qiu · Duluth, US
• Fiona Patricia Carney · Atlanta, US
• Nichola Kotov · Stillwater, US
• John Martin Lally · Lilburn, US
• Carol Ann Morris · Duluth, US
• Lynn Cook Winterton · Roswell, US

Key dates

• Filing date: May 22, 2002
• Grant date: Dec 7, 2004
• Expiry date: Nov 28, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B1/043
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present invention provides a method for forming on a medical device, preferably an ophthalmic lens, more preferably a contact lens, a diffusion-controllable coating capable of controlling the out-diffusion or release of guest materials from the medical device. The method of the invention comprises: (1) applying one layer of clay and optionally one or more layers of polyionic materials onto the medical device; or (2) applying alternatively a layer of a first polyionic material and a layer of a second polyionic material having charges opposite of the charges of the first polyionic material onto the medical device and releasing the coated medical device into a releasing medium having a composition capable of imparting a desired permeability to the diffusion-controllable coating on the medical device.