Swellable wound dressing materials

Details Swellable wound dressing materials Swellable wound dressing materials

A - Human Necessities

61

L

A61L 15/22 (2006.01) A61L 15/28 (2006.01) A61L 15/60 (2006.01) A61L 26/00 (2006.01)

Patent

CA 2116743

ABSTRACT The invention provides water swellable wound dressing materials comprising from 5% to 50% of an alginate ester of a C1-C6 polyhydric alcohol; from 50% to 95% of a humectant consisting of one or more C1-C6 monohydric or polyhydric alcohols; and from 0% to 30% of water, the percentages being calculated by weight based on the weight of the material when anhydrous. The preferred alginate ester is propylene glycol alginate (PGA). The materials swell but do not dissolve in cold or warm water. Insolubility is achieved by the addition of polyvalent cations such as calcium ions, or by covalent cross-linking of the PGA, or by adding from 10 to 35% by weight of a water-swellable polysaccharide such as gelatin, or by adding from 5% to 20% by weight of a cationic polymer such as chitosan.

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