Surgery – Truss – Pad
Patent
1983-09-12
1986-06-17
Rosenbaum, C. Fred
Surgery
Truss
Pad
128132D, A61L 1500
Patent
active
045950016
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to adhesive dressings for use on the human body. More particularly this invention relates to adhesive surgical dressings suitable for use on both exuding wounds and non-exuding wounds.
Moisture vapour permeable thin films coated with adhesive were disclosed in British Pat. No. 1,280,631 and U.S. Pat. No. 3,645,835 as being suitable for use as surgical dressings. In recent years one such film has come to prominence under the trade mark "Op-Site" and has found use as a surgical dressing, for example for covering burns, donor sites, surgical incisions, intravenous catheter sites and the like. The known dressings have proved useful because they keep out bacteria owing to the microscopically continuous nature of the film and adhesive layer but do not cause maceration of the skin to which it is applied because both the film and the adhesive layer have high moisture vapour permeability (MVP). One problem with presently available high MVP dressings is that the MVP is not high enough for some uses such as covering exuding wounds when an unsightly blister can occur. However it has not been thought practicable simply to increase the MVP of the product overall since this would lead to drying out of some wounds with a consequent reduction in the rate of healing. It has now been discovered that it is possible to alleviate the known disadvantages of conventional surgical dressings by providing dressings which transmit substantially more moisture vapour when in contact with a wetter wound than they do when in contact with a dryer wound.
Accordingly the present invention provides a surgical dressing which consists essentially of a film which carries an adhesive layer for securing the dressing to the body characterised in that (a) the film is continuous and comprises a polymer which in contact with water has a higher MVP than when in contact with moisture vapour but not water (b) the adhesive layer is adapted to allow access of water to the film when water is in contact with the adhesive layer so that (c) said surgical dressing has a MVP of not less than 2500 g/m.sup.2 when the adhesive layer is in contact with water and has an MVP of not more than 2000 g/m.sup.2 when the adhesive is in contact with moisture vapour but not water; whereby the dressing is suitable for use on exuding wounds and on non-exuding wounds.
When used herein with reference to "contact" the term "water" means liquid water (as opposed to moisture vapour) unless otherwise specified. When used herein MVP units are g/m.sup.2 /24hrs/37.degree. C./100-10% relative humidity and are generally abbreviated to g/m.sup.2.
Suitable test methods for determining the MVP of a dressing or its components are set forth in the Description hereinafter. When MVP values quoted thereinafter are referred to as "wet-MVP" they refer to values obtained with the adhesive face in contact with water and when referred to as "dry-MVP" they refer to values obtained with the adhesive face not in contact with water.
More suitably the dressing of this invention will have a wet-MVP of not less than 3000 g/m.sup.2, most suitably will have a wet-MVP of not less than 3200 g/m.sup.2 and preferably will have a wet-MVP of not less than 5000 g/m.sup.2.
More suitably the dressing of this invention will have a dry-MVP of not more than 1500 g/m.sup.2, most suitably will have a dry-MVP of not more than 1400 g/m.sup.2 and preferably will have a dry-MVP of not more than 1200 g/m.sup.2.
The film used in this invention may comprise any synthetic or modified natural polymer which has a sufficiently higher wet-MVP than dry-MVP to produce the desired MVP parameters in the dressing. The method set out in the Descriptions may be employed to determine whether the film material exibits the desired MVP when in contact with water. Most aptly the film comprises a synthetic polymer although modified natural polymers such as regenerated cellulose or cellulose acetate may be employed if sufficiently plasticised to conform to the movements of the body when adhered thereto. Preferably the
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European Search Report for Application EP 0,091,800, 83 30 1983.
Potter William D.
Rawlings David A.
Rosenbaum C. Fred
Smith and Nephew Associated Companies p.l.c.
Vinyard Sherri E.
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