Dressing

Details Dressing Dressing

1995-01-11

1997-07-01

Buiz, Michael Powell

Surgery: splint, brace, or bandage

Bandage structure

Skin laceration or wound cover

602 52, 602 58, A61F 1300

Patent

active

056431872

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention concerns a dressing of the type comprising a skin friendly pressure-sensitive continuous or discontinuous adhesive layer, which is coated on one side with a non-adhesive flexible polymer film, optionally with a flexible foam layer interposed between the film layer and the adhesive layer, and which is optionally coated on the other side with a removable release layer.
Dressings of the above-mentioned type are extensively used for the treatment of wounds, in particular cronic wounds, burns and surgical wounds. Dressings of the above-mentioned type are also used for the treatment of blisters, minor wounds and chafe wounds, as well as prophylactically to avoid the same, e.g. in connection with the practice of sports or manual labor and the like, where the skin areas, such as heels, elbows, knees and palms of the hand are subject to particularly severe stresses which easily give rise to the above-mentioned minor injures. Dressings of the above-mentioned type continue to find new fields of application. It may for example be mentioned that such dressings have also been found useful as a transcutaneous dosing means for the dosing of various medicaments, such as hormones or nicotine.
Thus, a large number of products of the above-mentioned type are known. The products most used are the so-called liquid absorbing bandages, e.g. hydrocolloid plasters and hydrogel plasters.
Hydrogel bandages consist of a liquid absorbing crosslinked polymer, such as collagen, polyvinyl alcohol and gelatine, as well as of a non-adhesive watertight film having a low water vapor permeability arranged on the side of the bandage which is not intended to face the skin of the patient.
A hydrogel bandage contains a large amount of water already prior to use. In the cases where the bandage is approximately saturated with water, the bandage is frequently not adhesive and must therefore be secured to the skin in another manner, e.g. by means of a plaster. An example of this is the so-called 2ND SKIN.RTM. dressing which is commercially available from Spenco Medical Ltd., U.K. Other hydrogel bandages having a lower content of water exhibit excellent adhesive properties. Certain modified gellable polymers, however, are capable of maintaining a reasonably good adhesive capability, even when they are essentially saturated with water.
Hydrogel bandages are known e.g. EP Patent Applications 97846 and 415183, SE Published Application 365 410, WO Patent Application 88/6894 and U.S. Patent Specification 4 093 673.
Hydrocolloid plasters normally consist of an elastomer, a plasticizer for elastomers, a tack promoting resin and optionally an oil based extender as well as an antioxidant, and water soluble or water swellable hydrocolloids, such as starch or cellulose derivatives or other hydrophillic polymers, and which is not intended to face the patient's skin.
Such a dressing is known e.g. from the DK Patent Specifications 147 034 and 147 035 (corresponding to U.S. Patent Specifications 4 231 369 and 4 367 632). The products mentioned in these consist of an adhesive material consisting of
(I) a continuous phase containing olefin styrene block copolymers or ethylene propylene block copolymers, cyclopentadiene, dicyclopentadiene, .alpha.-pinene and/or .beta.-pinene, polyethylene glycol or polypropylene glycol, or an ester of a di- or polybasic carboxylic acid with a preferably aliphatic alcohol, as well as
(II) a phase dispersed in the continuous phase and consisting of one or more water swellable hydrocolloids.
Also other elastomers may occur in known dressings, e.g., natural rubber, synthetic resins of a nature similar to natural rubber and silicone rubbers. Further, polyisobutylene in a suitable molecular weight distribution is also frequently used as an adhesive material and texture imparting component in dressings, e.g. as stated in U.S. Patent Specification 3 339 546.
Other dressings of a similar type are known from NO Published Application 157 686 as well as DK Patent Specifications 154 806, 147 226, 15

REFERENCES:
patent: 2785677 (1957-03-01), Stumpf
patent: 3972328 (1976-08-01), Chen
patent: 4285338 (1981-08-01), Lemelson
patent: 4773409 (1988-09-01), Cilento
patent: 5167613 (1992-12-01), Karami
patent: 5188124 (1993-02-01), Feret
patent: 5225199 (1993-07-01), Hidaka
patent: 5322695 (1994-06-01), Shah
patent: 5409472 (1995-04-01), Rawlings
patent: 5413567 (1995-05-01), Barth
Polymer Durometer Chart: Polyurethan--The Bridge Between Silicone Rubber and Plastics.

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