Surgical dressings

Claim 2

An integrally formed, non-laminated, non-rigid, open celled non-resticulated polyurethane foam wound dressing article wherein at least one of the surfaces of said article consists of a surface layer having a density substantially greater than the remaining portions of the said foam article; said dense surface layer being absorbent to aqueous based liquids in a manner and amount substantially similar to conventional cotton gauze or cottom wool wound dressings and comprised of open foam cells which are irreversibly partially collapsed as contrasted to the foam cells of said remaining portions of the article which are substantially uncollapsed and non-absorbent to aqueous based liquids.

Claim 3

A foam article as claimed in claim 1 in the form of a surgical dressing.

Claim 4

A foam article as claimed in claim 1 wherein the original foam is manufactured from a formulation comprising stannous octoate and trichlorofluoromethane.

Claim 5

A foam article as claimed in claim 3 wherein the original foam is manufactured from a formulation comprising the following composition by weight: Polyoxypropylene glycol 100 parts Stannous Octoate 0.2-0.3 parts Water 1-10 parts Dimethylethanolamine 0.1-1.0 parts Silicone Oil 1-10 parts Trichlorofluoromethane 10-20 parts Toluene di-isocyanate 70-90 parts.

Claim 6

A foam article as claimed in claim 3 wherein the original foam is manufactured from a formulation comprising the following composition by weight: Polyoxypropylene glycol 100 parts Stannous octoate 0.1-1.0 parts Water 1-10 parts Dimethylethanolamine 0.1-1.0 parts Silicone oil 1-10 parts Trichlorofluoromethane 10-20 parts Toluene di-isocyanate 25-50 parts.