Therapeutic foam

US8048439B2 · kind B2 · utility

Assignee

• BTG INTERNATIONAL INC. · GB

Inventors

• David D. Wright · Paragon Road, GB
• Anthony David Harman · London, GB
• Nikki Robinson · London, GB
• Garry Hodges · Stockton, GB
• Adil Kadar · Grafton, GB
• Geoffrey D. Moggridge · Cambridge, GB
• Hugh Van Liew · Orleans, US
• William John Jenkins · London, GB

Key dates

• Filing date: May 13, 2005
• Grant date: Nov 1, 2011
• Expiry date: Dec 27, 2027

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K9/122
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A therapeutic foam for the treatment of, inter alia, varicose veins comprises a sclerosing solution foamed with a physiological gas such as carbon dioxide, oxygen or a mixture thereof. The foam has a nitrogen content of less than 0.8%. It may be generated using a pressurized canister system incorporating a fine mesh of micron dimensions through which the gas and sclerosing liquid are passed to make the foam. Alternatively, the foam may be generated by passing gas and solution between two syringes through a fine mesh. Techniques are described for minimizing the amount of nitrogen in a canister or syringe based product. A technique for generating and delivering foam simultaneously using a syringe based device is also disclosed.