US 5,106,629 AGranted

Transparent hydrogel wound dressing

AssigneeNDM Acquisition Corp.

InventorsJames V. Cartmell, Wayne R. Sturtevant

Life of this patent

Estimating the term…

Loading patent…

Abstract

A flexible, transparent wound dressing product contains a clear hydrogel material in a gel-like phase. The wound dressing product is comprised of several layers including a wound dressing, a release layer, and a dimensionally stable backing member. The wound dressing is comprised of a thin-film transparent layer having an adhesive perimeter portion and a center portion, and a hydrogel material positioned in the center portion of the transparent layer. Since the wound dressing is transparent, a grid pattern may be printed on the thin-film transparent layer to permit measurement of a wound. During manufacture, a vacuum pressure is applied to allow temporary access to the center portion of the thin-film transparent layer, creating a cavity for insertion of the hydrogel material. The dimensionally stable backing member is then adhesively attached around the perimeter portion of the thin-film transparent layer to help the wound dressing maintain its shape. When the wound dressing product is to be applied to a wound site, the release layer is removed, preferably using an extending tab attached thereto, to expose the hydrogen material. The remaining layers of the wound dressing product are then applied to the wound site, with the hydrogel material directly contacting the wound. Once these layers are in place, the dimensionally stable backing member is removed, preferably using an extending tab attached thereto.

Claims17

Dependent claims

A method of manufacturing a wound dressing product for a wound, comprising the steps of:

providing a transparent thin-film layer, said transparent layer having a first side and a second side and further having a perimeter portion and a center portion;
coating said first side of said transparent layer with a first adhesive layer;
providing a removable dimensionally stable backing member defining a center aperture whereby said dimensionally stable backing member surrounds but does not overlie said hydrogel material contained in said center portion of said transparent layer, said dimensionally stable backing member having a first side and a second side;
coating said first side of said dimensionally stable backing member with a second adhesive layer;
laminating said second side of said transparent layer to said first side of said dimensionally stable backing member wherein said second adhesive layer is located between aid transparent layer and said dimensionally stable backing member;
said first adhesive layer having stronger adhesive qualities than said second adhesive layer so as to allow removal of said dimensionally stable backing member from said transparent layer after application of the wound dressing product tot he wound while maintaining adhesion between said transparent layer and the skin of a patient;
applying a vacuum pressure to said center portion of said transparent layer to define a cavity in said center portion;
inserting a clear aqueous polyurethane hydrogel material in said cavity in said center portion of said transparent layer during the application of said vacuum pressure thereto;
providing a release liner, said release liner having a first side and a second side;
and
laminating said first side of said transparent layer to said first side of said release liner wherein said first adhesive layer is located between said transparent layer and said release liner.

8 more elements

A method of manufacturing a wound dressing product for a wound, comprising the steps of:

providing a transparent thin-film layer, said transparent layer having a first side and a second side and further having a perimeter portion and a center portion;
coating said first side of said transparent layer with a first adhesive layer;
providing a dimensionally stable backing member, said dimensionally stable backing member having a first side and a second side;
coating said first side of said dimensionally stable backing member with a second adhesive layer;
laminating said second side of said transparent layer to said first side of said dimensionally stable backing member wherein said second adhesive layer is located between said transparent layer and said dimensionally stable backing member;
said first adhesive layer having stronger adhesive qualities than said second adhesive layer so as to allow removal of said dimensionally stable backing member from said transparent layer after application of the wound dressing product to the wound while maintaining adhesion between said transparent layer and the skin of a patient;
applying a vacuum pressure to said center portion of said transparent layer to define a cavity in said center portion;
inserting a clear hydrogel material in said cavity in said center portion of said transparent layer during the application of said vacuum pressure thereto, said hydrogel comprising:
(a) from about 15% to about 30% by weight of a polyhydric alcohol;
(b) from about 8% to about 14% by weight isophorone diisocyanate terminated prepolymer;
(c) from about 5% to about 10% by weight polyethylene oxide based diamine;
(d) up to about 1% by weight sodium chloride;
and
(e) the balance water;
providing a release liner, said release liner having a first side and a second side;
and
laminating said first side of said transparent layer to said first side of said release liner wherein said first adhesive layer is located between said transparent layer and said release liner.

14 more elements

A wound dressing product for a wound, comprising:

a wound dressing including
a transparent layer, having a center portion and an adhesive perimeter portion surrounding said center portion, and further having a first side and a second side,
a first adhesive layer coating, said adhesive positioned on said first side of said transparent layer, and
a layer of an aqueous polyurethane hydrogel material positioned on said first side of said transparent layer in said center portion;
a release liner overlying said hydrogel material and secured to said first side of said transparent layer by means of said first adhesive layer;
and
a removable dimensionally stable backing member defining a center aperture whereby said backing member surrounds but does not overlie said hydrogel material contained in said center portion of said transparent layer, said backing member having a second adhesive layer and being secured to said second side of said transparent layer, opposite said first side, by means of said second adhesive layer, wherein said first adhesive layer having stronger adhesive qualities than said second adhesive layer so as to allow removal of said dimensionally stable backing member from said transparent layer after application of the wound dressing product to the wound while maintaining adhesion between said transparent layer and the skin of a patient.

4 more elements

Dependencies are inferred from the claim text.