DE2950849A1 - Wound bandage - Google Patents

Description

THE KENDALL COMPANY, 95 West Street, Walpole, Mass./USA

Wound dressing

The invention relates to a wound dressing with an absorbent insert which is permeable to liquids Outer shell and a porous, made of fiber material rear shell is located.

Wound dressings of the aforementioned type are required to soak up the body fluids that come out of the wound leak on which they are used. However, you need to avoid puncturing, i.e. total Passage of body fluids through the bandage. Although this can be achieved by simply putting a sheath of liquid impermeable on the back of the dressing Plastic film is applied, this way out is not satisfactory, because it also the Passage of gases, such as air, to and from the wound through the bandage is prevented, so that the healing process is disturbed will. Numerous efforts have been made to meet these reluctant demands but, although it has been possible to prevent the passage of liquids and have some breathability, i.e. the possibility of the passage of Creating air and other gases, the well-known wound dressings of this type allow the passage of bacteria and consequently risk infection of the bandaged wound.

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In contrast, the object of the invention is to create a wound dressing of the type mentioned at the outset, in which not only avoids penetration of the wound fluid and ensures breathability, but in which the passage of bacteria through the wound dressing is at least greatly delayed. To solve this The object is according to the invention in a wound dressing of the type mentioned at the outset, the rear cover with a treated with textile finishing, water-repellent fluorocarbons. When treated like this rear shell water is applied, the water forms free-standing droplets on the outer surface of the shell, which do not penetrate into or through the dressing without the application of pressure.

In the drawing, two exemplary embodiments of the subject matter of the invention are shown. Show it:

1 shows a wound dressing according to the invention, partially broken away, in a top view,

FIG. 2 shows the dressing in a vertical section along line 2-2 of FIG. 1,

3 shows the association in a vertical section along the line 3-3 in FIG. 1 in a partial representation and

FIG. 4 shows another exemplary embodiment of the wound dressing in the same type of representation as in FIG. 2.

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The wound dressing 10 shown in FIGS. 1 to 3 contains an absorbent insert 12, a liquid-permeable one Outer shell 14, which is to come into contact with the skin and the wound / as well as a porous back cover 16. The liner 12 has a front surface 18, a back surface 20, side edges 22 and end edges 24. The insert 12 can be made of any suitable material, e.g. a mass of cellulose fibers made by breaking up wood pulp and known as wood flakes are.

The back cover 16 covers the back surface 20 of the liner 12 and has side edges 26 that are folded over the side edges 22 of the liner 12. The outer cover 14 has opposite side edges 28 which are folded around the rear surface of the rear cover 16 and the parts 32 of which are fastened together in a suitable manner, for example by gluing, behind the rear surface 30 of the rear cover 16. The outer cover 14 accordingly extends completely around the dressing, so that a soft, flexible and pleasing outer surface of the dressing is created. The outer cover 14 can be made of any suitable material, such as nonwoven fabric, and its front surface 34 should not adhere to a patient's wound. The outer shell 14 is preferably made of a polyester rayon nonwoven fabric, which is marketed by the applicant under the trade name "Novonette SP 117". The opposite end edges 36 and 38 of the outer shell 14 and the rear shell 16 are fastened to one another in a suitable manner , for example by means of an adhesive bond,

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to close the ends of the bandage.

The rear cover 16 is made of any suitable one Fiber material and can be made from the same nonwoven fabric from which the outer shell 14 is made.

The rear cover 16 is coated with a textile-finishing, water-repellent before being introduced into the bandage Fluorocarbon substances, e.g. B. treated the aqueous dispersion of the fluoropolymer, which is available under the commercial

Il

called "Zonyl NWG" or NWK "by Du Pont or sold under the tradename" Scotchban FC-824 "by the 3M Company. If desired, an aqueous dispersion of a thermosetting resin such as that sold under the tradename" Sunsize 16 " sold by Sun Chemical Corporation _{/ in} addition to the fluorocarbon fabric finishing hydrofluorocarbon agent by mixing the two aqueous dispersions together in a desired ratio. The back wrap 16 may be coated with the fluorocarbon hydroforinizing hydrofluorocarbon agent by any method be treated, for example by dipping it into the aqueous solution and then passing it through nip rollers. The dispersion can also be applied by covered rollers or by spraying. If a thermosetting resin is applied in a process step, the treated casing must be heated, for example on 116 ° C for one minute or at a higher temperature for a shorter time to bring the resin into the thermoset state. The amount of the fabric finishing fluorocarbon water repellant that is used can vary widely. In general, amounts are from 0.1 to 3 percent by weight based on the dry weight of the

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Shell effective. The textile finishing agent is preferably applied in the form of an aqueous solution which Contains 10 to 50 weight percent solids.

The second embodiment of the invention shown in Fig. 4 is constructed and treated in the same way, as described above, except that a second layer 40 of the same Material like the back cover 16 and with the textile finishing, water-repellent fluorocarbon agent treated like this, between the rear cover 16 and the insert 12 is inserted.

Wound dressings designed in the drawn manner are breathable by allowing air and other gases to pass through, but are impermeable to fluids such as blood and blood plasma oozing out of the wound. In addition, delay the passage of bacteria through the dressing, and experiments have shown that bacteria completely passed through the test dressings identical to those described above with the Exception that the treatment of the back cover or covers with the textile-finishing, water-repellent fluorocarbon agent has been omitted.

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Claims (3)

Patent attorneys Dipl.-lng.W. Scherrmann Dr.-Ing. R. Rüger '300 Esslingen (Neckar). Webergasse 3, Postfach 348 December 17, 1979 τβΐβ (οη PA 125 naeh "" "" "" "^ T a I · ι 07 256610 smru telegrams patent protection Easllngenneckar patent claims 1. Wound dressing with an absorbent insert, which is in a liquid-permeable outer shell and a porous, made of fiber material rear shell, characterized in that the rear Sheath (16) is treated with a textile-finishing, water-repellent fluorocarbon agent. 2. Wound dressing according to claim 1, characterized in that it has two superposed porous, made of fiber material existing rear covers (16, 40), which are coated with a textile-finishing, water-repellent Fluorocarbon agents are treated. 3. Wound dressing according to claim 1 or 2, characterized in that the rear shell (16) or the rear Sleeves (16, 40) are also treated with a thermosetting resin. 030027/0772 ORIGINAL INSPECTED