Surgery – Truss – Pad
Patent
1986-12-09
1989-04-04
Apley, Richard J.
Surgery
Truss
Pad
128156, 128783, 128464, 604 20, 604304, 204415, A61F 1300, A61F 1500
Patent
active
048175943
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to anti-bacterial wound dressings. In particular, it relates to integral dressings which can be used to cover contaminated, discharging malodorous wounds, and assist in their treatment. More specifically, it relates to wound dressings comprising activated carbon.
The utility of carbonised fabric in surgical dressings has been appreciated for over 50 years. GB-A-0386867 discloses surgical dressings comprising woven or entangled carbonised fibres. Such dressings are also disclosed as supports for therapeutic or antiseptic materials and it is stated that "the dressings will hold in considerable quantities iodine, formol, lime, oxygen, bacillary toxins, and the like". The use of, say, iodine, in such dressings appears to be a consequence of the adsorptive characteristics of charcoal cloths. GB-A-1301101 discloses a particularly useful, and commercially used, process for preparing activated carbon products in fibrous form. Rayon, for example, is impregnated with a solution of inorganic halides and then activated in a controlled heating step. The products, i.e. activated carbon cloth or felts, adsorb both organic materials and bacteria.
Surgical dressings using activated charcoal impregnated with anti-bacterial agent, within an envelope of permeable material, are disclosed in EP-A-0053936; the adsorptive sites of the activated charcoal are no more than 20% saturated with an anti-microbial agent, preferably iodine.
A disadvantage of such a dressing is that the agent incorporated in the dressing inherently limits the bacteria-adsorbing characteristics of the charcoal and could adversely affect wound healing. Further, the charcoal cloth can easily fragment, and carbon particles can find their way into the wound.
EP-A-0099758 discloses a three-layered composite (but not integral) wound dressing comprising a semi-permeable membrane, a permeable supporting and reinforcing layer, and a non-stick, self-sealing biodegradable tissue interface. The permeable layer may be an activated carbon cloth.
GB-A-2127389 discloses a surgical dressing comprising activated charcoal cloth or felt which has been produced so that it contains elemental silver distributed throughout. Such a product is at least bacteriostatic, but may not "fix" bacteria or facilitate wound healing.
It is an object of the invention to provide an anti-bacterial wound dressing which has an integrated structure and assists wound healing. In other words, the wound dressing should provide a barrier against bacterial contamination and mechanical injury, and also provide controlled water vapour transmission and controlled heat loss. It is a further object of the invention to provide a wound dressing which is not merely therapeutic but also bactericidal.
An integral anti-bacterial wound dressing according to the present invention comprises five layers which are, in order (except that layers 3 and 4 may be in either order), mesh; charcoal fabric (3), and are bound together in the surrounding area.
The accompanying drawing is an enlarged cross-sectional side view (not to scale) of a wound dressing which is an illustrative embodiment of the present invention.
The drawing shows a first layer of permeable material 1, a layer of a semi-permeable material 2, an open mesh 3 which is electrically-conductive, an activated charcoal fabric 4 and a second layer of permeable material 5. The permeable layers 1 and 5 and the semi-permeable layer are bonded at the border area 6 of the product, i.e. around the fabric 4.
It is intended that layer 5 should come into contact with a wound. In this position, bacteria in the atmosphere which come into contact with layers 1 and 2 are prevented from passing to the wound.
The integral nature of the dressing according to the present invention may be provided by heat-sealing or otherwise bonding layers 1, 2 and 5 in the area surrounding layer 4. Depending on the extent of this area, the charcoal fabric is more or less loosely held.
Alternatively, and as is often preferred, a semi-permeable material having double-sid
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Apley Richard J.
Prebilic Paul
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