Surgery: splint – brace – or bandage – Bandage structure – Skin laceration or wound cover
Patent
1997-04-18
2000-02-08
Weiss, John G.
Surgery: splint, brace, or bandage
Bandage structure
Skin laceration or wound cover
602 41, 602 58, A61F 500
Patent
active
060230088
DESCRIPTION:
BRIEF SUMMARY
This invention relates to wound dressings, their manufacture and use. More particularly, this invention relates to wound dressings comprising an alginate pad and an adhesive layer, to the method of their manufacture by applying a water based adhesive to an alginate pad and to the use of such dressings in treating wounds.
A number of alginate wound dressings are available comnercially. Alginate dressings have the virtue of being able to absorb significant amounts of wound exudate and help maintain the wound in a condition which aids its recovery. It is frequently desirable to render the dressing autoadhesive by which it is meant that it can be located at the wound without reliance on a separate dressing. Because of the need to maintain the absorptive properties of the dressing and because of difficulties in applying adhesives directly to known forms of alginate pads, the art has hitherto achieved autoadherence by providing the dressing with a peripheral flange which is coated with adhesive; for example as described in European Patents 243,069 and 236,104. Such dressings locate the alginate pad over the wound by adhering to the skin surrounding the wound. They are rather difficult to manufacture and are not easily cut to shape when i. is desired to match the dressing to the shape of an irregular wound.
A dressing has now been discovered which is absorbent, autoadhesive, capable of being manufactured without recourse to peripheral adhesive coated flanges and which can be cut to shape if desired. Hitherto it has not been practical to provide alginate dressings with adhesive on the alginate itself because of processing difficulties and, more importantly, the relatively poor absorption properties that resulted.
Accordingly the present invention provides an autoadhesive wound dressing which comprises a pad of highly absorbent alginate fibres one face of which has an interrupted layer of a pressure sensitive adhesive.
By "highly absorbent" with respect to the fibre it is meant that they will absorb at least 40 g/g of deionized water. A suitable method of determination is set forth hereinafter. Most aptly the alginate fibres will be present in a pad that can absorb at least 60 times, more aptly at least 80 times, for example 80-280 times its own weight, more aptly 90 to 150 times for example about 120 times its own weight of deionized water.
It is the highly absorbent nature of the pad made from such fibres that allows easy manufacture of the dressing. Previously alginate fibre pads have proved extremely difficult to provide with an adhesive layer but by using a water based adhesive in conjunction with such a highly absorbent fibres a dressing with particularly desirable properties has been produced.
Because of their highly absorbent nature, the dressings of this invention are particularly suitable for use on exuding wounds such as ulcer, burns or the like. When used to treat such wounds the dressing may be cut to shape if desired and gently adhered to the surrounding skin. The dressing can be left in place for a considerable time as it promotes a healthy wound healing environment.
Typically the pad is a wet-laid pad of fibres which if desired can be needle-tacked or hydraulically entangled. miner amounts of fibres of other material may also be present if desired but this is not generally preferred. Most aptly the pad is 0.5 to 7.5 mm thick and is preferably 1 to 5 mm thick, for example 1.5 to 3 mm thick. Typical dressing sizes are rectangular with sides of from 4 to 20 cm, for example 5.times.15 cm, 10.times.10 cm and the like although other shapes may be employed, for example circular, oval or the like.
The adhesive employed may be any suitable pressure sensitive adhesive such as a polyacrylate, polyether, polyurethane or the like. Preferably the adhesive layer is derived from an aqueous based adhesive, for example an emulsion adhesive such as aqueous polyacrylate emulsion adhesive.
The adhesive layer will be interrupted, that is it wil have apertures sufficient to permit the passage of exudate there through. The
REFERENCES:
patent: 5681579 (1997-10-01), Freeman
Kershaw David
Mahoney Peter M.J.
Bristol--Myers Squibb Company
Furman Jr. Theodore R.
Hart Kelvin
Kilcoyne John M.
Weiss John G.
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