Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1986-11-12
1987-12-29
Yasko, John D.
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
128156, A61F 1316
Patent
active
047158573
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to anti-bacterial wound dressings. In particular, it relates to integral dressings which can be used to cover contaminated and discharging malodorous wounds, and assist in their treatment. More specifically, it relates to wound dressings comprising activated carbon.
BACKGROUND OF THE INVENTION
The utility of carbonized fabric in surgical dressings has been appreciated for over 50 years. British Patent Specification No. 386,067 disclosed surgical dressings comprising woven or entangled carbonized fibers. 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.
British Patent Specification No. 1,301,101 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.
Activated carbon cloth or felts of the type produced by the process described in British Patent Specification No. 1,301,101 adsorb both organic materials and bacterial. Surgical dressings using activated charcoal impregnated with anti-bacterial agent placed within a permeable teabag-like material are disclosed and illustrated in European Patent Publication No. 53,936, published June 16, 1982; in that case the adsorptive sites of the activated charcoal are no more than 20% saturated with an anti-microbial agent, preferably iodine.
The disadvantage of a dressing of this type is that the agent, incorporated in the dressing, inherently limits the bacteria-adsorbing characteristics of the charcoal and could adversely affect wound healing. The charcoal cloth can easily fragment, and carbon particles can find their way into the wound.
European Patent Publication No. 99,758, published Feb. 1, 1984, 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.
British Patent Publication No. 2,127,389A, published Apr. 11, 1984, 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.
OBJECT OF THE INVENTION
It is an object of the invention to provide an antibacterial 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 vapor transmission and controlled heat loss.
SUMMARY OF THE INVENTION
An antibacterial wound dressing according to the present invention comprises four strata which are, in order, the charcoal cloth or felt.
BRIEF DESCRIPTION OF THE DRAWING
The accompanying drawing is an enlarged cross-sectional side view (without reference to true relative thicknesses) of a wound dressing which is an illustrative embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The integral nature of the dressing according to the present invention is a consequence of the double-sided adhesive properties of the semi-permeable material. The charcoal cloth or felt is thus bound together, via the semi-permeable material, over one entire surface to the first layer of permeable material. The tow layers of permeable material are thus bound together, via the semi-permeable material, in an area which borders the cloth or felt. The only area of non-adherence is over the adjacent faces of the cloth or felt and the second, wound-facing permeable material, making
REFERENCES:
patent: 2690415 (1954-09-01), Shuler
patent: 3299890 (1967-01-01), Parker
patent: 3340875 (1967-09-01), Dudley et al.
patent: 3903882 (1975-09-01), Augurt
patent: 3939838 (1976-02-01), Fujinami et al.
patent: 4088132 (1978-05-01), Wood et al.
patent: 4547195 (1985-10-01), Jackson
Juhasz Laszlo
McLeod Angus I.
Charcoal Cloth Ltd.
Yasko John D.
LandOfFree
Wound dressings does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wound dressings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wound dressings will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-460962