Surgery – Truss – Pad
Patent
1980-07-17
1982-07-20
Rosenbaum, C. Fred
Surgery
Truss
Pad
128156, 128260, A61F 1300, A61L 1500
Patent
active
043400434
DESCRIPTION:
BRIEF SUMMARY
This invention relates to sheet material used for medical purposes.
More especially this invention relates to polymeric sheet material of high moisture vapour permeability having upon one surface a layer of adhesive material which does not destroy the said permeability.
Such material is already known per se and is described in British Pat. No. 1 280 631 in general terms. It is available, for example, under the Registered Trade Mark "Op-Site". It is used as a surgical and dressing material to cover wounds (including burns) and surgical sites. In this manner it is effective to keep bacteria from the wound, and to prevent scab formation and inhibit scarring since the layer, while permeable to moisture vapour, obviously slows down the drying time of the wound.
Such material is commonly made of polyurethane sheet, e.g. Goodrich polyether polyurethane sold under the Trade Name "Estane", which can be up to three thousandths of an inch (75 microns) in thickness but is commonly less than 45 microns e.g. about 30 microns. It is coated on one surface with a continuous or discontinuous layer of suitable adhesive to approximately the same thickness. By continuous we mean that the adhesive covers the whole surface without any gaps or blank spaces; by discontinuous we mean that there is a microporous adhesive, or a pattern of lines or dots of adhesive, the pattern covering the whole surface uniformly but of course leaving occasional gaps between units of adhesive. Both of these expedients are well known in the coating art, but continuous adhesive is preferred in this context to plug any small pinholes in the sheet.
Although a sheet of material as described is effective in keeping from the wound or surgical site airborne bacteria, there remains the problem of any bacteria which happen to be present in the site or, more commonly, upon the surrounding skin. In the enclosed conditions provided by such a sheet, such bacteria can multiply unduly and lead to an infection problem.
It has been proposed to overcome this by liberal application of bacteriocidal or bacteriostatic cream or like formulation over and around the wound or surgical site. There are, however, disadvantages in this procedure since the film, if subsequently applied over this moist cream base layer, can corrugate with movement of the body and generally does not adhere.
The present invention is based upon the realisation that a bacteriostatic or bacteriocidal material can be incorporated into the adhesive layer of the sheet.
The invention accordingly consists in an adhesive-coated sheet material which is liquid-impervious but has a high moisture-vapour permeability whereby it is suitable as a wound or burn dressing, or surgical drape or like wound-covering material, wherein the adhesive coating has disseminated throughout its mass an amount of an antibacterial material sufficient to kill bacteria in the wound and surrounding covered skin area.
As well as preserving adhesion and avoiding corrugation, this invention has two advantages. Firstly, the antibacterial substance being disseminated throughout the adhesive is present in uniform known amount per unit area both over the wound and over its surroundings. Secondly, no additional substrate is needed so that the sheet can be accurately emplaced on the skin. As already stated, it then lies flat on the skin with consequent uniform water vapour transmission and bacterial barrier properties. Also avoidance of corrugations allows retention of protective and healing wound exudate over burns.
The antibacterial materials could be bacteriostatic but are usually bactericidal in nature. Various types of such materials could be used eg:
(i) metal salts, or like compounds with antibacterial metal ions, e.g. copper, mercury or silver, and optionally with additional nonmetallic ions of antibacterial properties.
(ii) typical antibiotics e.g. neomycin, soframycin, bacitracin, polymycin.
(iii) antibacterials such as chlorhexidine and its salts
(iv) quaternary ammonium compounds e.g. cetrimide, domiphen bromide, polymeric quaternar
REFERENCES:
patent: 2427022 (1947-09-01), Russ et al.
patent: 3598123 (1971-08-01), Zaffaroni
patent: 3624224 (1971-11-01), Wei et al.
patent: 3645835 (1972-02-01), Hodgson
patent: 3731683 (1973-05-01), Zaffaroni
patent: 3969498 (1976-07-01), Catania et al.
Rosenbaum C. Fred
Smith & Nephew Research Ltd.
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