DE1919028A1 - Wound pad - Google Patents

Description

"Wound pad"

The invention relates to a wound dressing with an adhesive layer. The known wound dressings consist of a textile or plastic base with a sterile wound pad and a layer of glue on the hand. The invention solves the problem to simplify the structure of the wound dressing considerably. According to the invention this happens because a cover made of compacted plastic cell structure has a surface that in proportion is more compacted to the lower surface and the "lower surface is provided with the adhesive.

The object of the invention can be used as a bandage and as adhesive stretchable ("adhesive-streich!) bandage can be formed.

The wound pad can be made so that you have different Amounts of heat can act on the opposite sides of a plastic of cell structure under pressure however, the wound dressing can also be composed of at least two layers of plastic with a cell structure lying on top of one another.

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In the latter case, "you don't need to treat the surfaces in order to To bring them together to the K. ', rather a simple matter is sufficient Compression of the individual parts at a given temperature, given Pressure and given time to adhere to each other. The assembled wound pad remains in its compressed state when the pressure is removed.

The procedure for joining a group of plastic ceilings of cell structure is the subject of earlier British patent applications (Nos. 14-31 / 67, 14-33 / 67, 13078/67 and 1307967).

Optionally, for the production of wound dressings composed of blankets, these can be combined with one another using an adhesive mixture be connected, or one uses heat to melt the surfaces, as it is also in an earlier British patent application (154-15 / 66) is laid out ge. The compound The wound pad is then pressed and different amounts of heat are applied to the surfaces facing away from each other, in order to achieve a different density. To assemble an underlay you can use blankets that consist of different material of cell structure.If covers made of plastic of cell structure of the same barren consist of different materials, then they may be different Pressure modules (i.e. resistance to pressure). · .- <■ · «

Compaction of a blanket or a number of blankets can be carried out under Use of press plates in a thick mold (spacer mold operation) using nip rollers in a calender (rotocure) machine or in a twin belt machine be performed.

The temperature must in compacting a ceiling or a group-pe vary from ceiling in a wide range, for example between 20 ⁰ C to 35O ⁰ C. Preferably, the temperature is low on an area of the ceiling or the ceiling group compared to the temperatures at the averted area of the

ceiling

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or the ceiling group when the compaction takes place. A useful temperature on the one hand can for example be up to 250 ⁰ G, in the example 120 ⁰ G, and the temperature on the turned away surface can be up to 35O ⁰ G, preferably between 120 and 30O ⁰ G. However, the temperature used when compacting a cellular plastic cover should preferably not be below the Vicat softening point of the material in the solid state with no cell structure (ASTM D1525-650?).

Suitable ranges for the temperatures in the compaction of various plastics of cell structure that are used in the manufacture The following can be used by wound dressings:

Material: Compression residual tempe r at ur ( ⁰ G)

Polyether polyurethane 100-3OO

Pi-. lye st er polyurethane 100 - JOO

Polyethylene, low density 85-90 Polyethylene, middle

Density 90 - 11-5

Polypropylene 14-5-115

Polystyrene _ ■ 80-105

Polyvinyl chloride 70-200

To produce the wound dressing made of plastic with a cell structure, any plastic foam with open cells or a plastic foam with a network-like tangled fiber structure can be used, ie one in which the overlooked! of cells are connected to one another and form pores or passages within the material. Particularly suitable is plastic foam that has a network-like tangled structure, ie material with a cell structure in which all walls in the cell structure are perforated or essentially missing, but plastic foam can also be used if so desired not a web-like confused

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ne fiber structure.

Self-adhesive wound dressings according to the present invention can be made in tape form or as a single plaster of circular shape or rectangular or square.

Usable adhesives are, for example, acrylic polyurethane, natural rubber, styrene-butadiene, polyisobutylene and polyvinyl ether adhesives. An acrylic adhesive is preferably used. .

You can apply the adhesive to the plastic in an openwork pattern and thus maintain the air permeability of the plastic also in the area where it sticks.

The dressing can and can have a sterile area be a piece of sterile fiber material attached to the less densely compacted area.

The sterile fiber material can be the same as that used for the conventional V / and requirements are used. Optional and in particular the sterile area may be part of the less densely packed area of the material of the cell structure itself. The material of the cell structure can be made sterile, for example with gamma rays.

If: t the wound pad a self-adhesive pad and of rectangular shape or square? orm ^ then you can have two or also more of the outer edges of the less densely compressed area Compress a little more than the middle area. Is this Adhesive plaster circular, then the peripheral edge can be more compact than the middle. The glue is then applied to ' placed on the outer hand.

If the wound pad according to the invention also in the main water cannot penetrate at all, then, if the above is desired, it can be subjected to treatment.

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through which it becomes completely impenetrable to water. This can be done by coating the more densely compressed surface with, for example, silicone.

Mn typical foam that is used as the starting material for the Can use in the manufacture of wound dressings is one that which has, for example, 24 pores per centimeter. The density of Wound dressing on the more compacted side is appropriate between 0.9 and 1 g / can and on the less "strongly compressed Page between 0.4 and 0.6 g / ccn} but these numbers are supposed to serve only as a guide and are not intended to have any restrictive meaning. Can be used as a useful thickness for the wound dressing to take 0.75 πωι.

The subject matter of the invention is explained using the following example:

Example ·

Two covers made of polyester-polyurethane foam with a diameter of 6 mm and 24 pores per centimeter are now placed on top of one another on a steel support belt of 0.125 mm. placed and passed through a series of successive calibration devices. The calibration gap was 0.38 mm. The temperature was such that the surface of the foam which was in contact with the belt, was maintained at 23O ⁰ G and the other surface was held at 120 ° C. The. Speed was 0.9 m / min and the effective working length was 30.5 cm. The compacted product had a density of 0.9 g / ccm on the side with the higher compression and a density of 0.5 g / ccm on the other surface.

The compacted product was cut into 1.25 cm by 3.8 cm strips and brushed on the two Ends a layer of acrylic adhesive applied to the middle area exposed an area of 1.15 cm by 1.25 cm.

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Measurements showed a dynamic permeability in this area of 2.0 ccm / cm / cm / sec. This value refers to the flow of air on the square centimeter of an area of the sample in one second under a pressure differential of 1 cm water column across the sample.

Claims: 909843/1308

Claims (11)

Patent claims: 1) Wound pad with adhesive layer, characterized ge ichnet that a cover made of compacted plastic "cell structure has a surface,
which is more compact in relation to the lower surface
and that the lower surface is provided with adhesive. 2) wound dressing according to claim "!, Characterized in that that the plastic is an open cell plastic foam. 3) wound dressing according to claim 1, characterized in that that the plastic foam has a network-like tangled fiber structure. · 4) A wound dressing according to claims 1-3 _t characterized in that the plastic foam is Polyuräthan-. 5) Wound dressing according to claims 1-4, characterized in that the adhesive is an acrylic adhesive . 6) Wound dressing according to claims 1-4, characterized in that a part of the less strong
compacted lower surface is sterile. 7) Wound dressing according to claims 1-6, characterized by gekennzeich.net that the sterile surface is part of the few: highly compacted lower surface of the plastic with cell structure is. 8) wound dressing according to claims 1-4, d a u rch g e - 09843/1308 indicates that "one or more outer edges of the less densely compacted area something is more compressed than the middle area » 9) Wound dressing according to claims 1-4, d a d u r c h marked that the more condensed Surface is covered with silicone. 10) wound dressing according to claims 1-.4-, d a d u r c h marked η e t that the density of the more compacted area is between Ο, φ and 1 g / ccm. 11) Wound dressing according to claims 1-4, d "a d u r c h characterized that the density of the less heavily compacted area between 0.4 and 0.6 g / ccm amounts to. 909843/1308