Use of a polyurethane foam as a wound dressing in negative pressure therapy
AssigneePaul Hartmann AG
InventorsAxel Eckstein, Pierre Croizat, Ulrich Fink, Krzysztof-Daniel Malowaniec
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Abstract
A device for negative pressure wound therapy having a cover material for air-tight sealing of the wound space connected to a negative pressure source; and a wound dressing having an open-cell polyurethane foam. The open-cell polyurethane foam has special properties, in particular a tensile strength after three days of storage in bovine serum, measured in accordance with DIN 53571, between 80 kPa and 300 kPa. The open-cell polyurethane foam may be used as a wound dressing in negative pressure wound therapy.
Claims20
A device for negative pressure wound therapy comprising
- (a) a cover material for air-tight sealing of a wound space;
- (b) optionally, a connector of a negative pressure source;
- and
- (c) an open-cell polyurethane foam as a wound dressing, obtained by reaction of a mixture comprising the components
- (i) polyisocyanate,
- (ii) polyol,
- (iii) blowing agent, and
- (iv) catalyst,
- whereby the open-cell foam, after three days of storage in bovine serum, has a tensile strength, measured in accordance with DIN 53571, between 80 kPa and 300 kPa, and
- whereby the open-cell polyurethane foam has an air permeability of 1,000 to 8,000 l/(m2sec), measured in accordance with DIN EN ISO 9237.
A device for negative pressure wound therapy comprising
- (a) a cover material for air-tight sealing of a wound space;
- (b) optionally, a connector of a negative pressure source;
- and
- (c) an open-cell polyurethane foam as a wound dressing, obtained by reaction of a mixture comprising the components
- (i) polyisocyanate,
- (ii) polyester polyol,
- (iii) blowing agent, and
- (iv) catalyst,
- whereby the open-cell foam, after three days of storage in bovine serum, has a tensile strength, measured in accordance with DIN 53571, between 80 kPa and 300 kPa,
- whereby the open-cell polyurethane foam has a ductile yield of 250% to 650%, measured in accordance with DIN 53571.
A method for negative pressure wound therapy, said method comprising
- dressing a wound with an open-cell polyurethane foam obtained by reaction of a mixture comprising the components
- (i) polyisocyanate,
- (ii) polyol,
- (iii) blowing agent, and
- (iv) catalyst,
- wherein the open-cell foam is selected such that after three days of storage in bovine serum it has a tensile strength, measured in accordance with DIN 53571, between 80 kPa and 300 kPa, and wherein the open-cell polyurethane foam has an air permeability of 1,000 to 8,000 l/(m2sec), measured in accordance with DIN EN ISO 9237, and
- applying negative pressure to the wound.
Dependencies are inferred from the claim text.