FI59025C - SAFETY AND OVERFLOWERS FOR FRAMSTAELLNING - Google Patents

Description

.1. ADVERTISEMENT - Λ Λ Λ - JSfo W t11) utlAgoninosskrift 5 90 2 5 + ¾¾¾ C (45) PaUnttl 5nr: tty '0 ..) 6' / 'Jl (51) Kv.ik.Vo.3 A 61 L 15 / 01, A 61 P 15/00 SUOH I — FINLAND (21) rMntah * «mi-nt ** aM6k * ng 1229/72 (22) Halwmtapllvl —An * ekirtB * rf« | 29.0U.72 (23) AlkupUvt — GIMftietadif 28.0U.72 (41) Tullut lutklMkal - Rlhrtt off «ntllg qj J2 ntmta-jt nklmritaim ·. μνμ ^^ μιμ. ^ - fttn * octi rf Ittfityfiwn '' AmMom utiagd och ut) j £ nrun puMmrad 27.02.81 (32) (33) (31) PyyJtty «moMww Iqfd prtorttt 06.05.71 Austria-Österrike (AT) A 3950/71 (71) Bunzl & Biach Aktiengesellschaft, Engerthstrasse 16I-I63, Vienna II, Austria-Austria (AT) (72) Hermann Jank-Homolatsch, Vienna, Johann Gasparin, Vienna, Austria-Austria (AT) (7U) Berggren This invention relates to absorbent wound dressings which do not adhere to a wound and to a method of making the same. Wound dressings and methods of making the same.

It has long been known to make absorbent wound dressings which do not adhere to the surface of the wound and which are nevertheless sufficiently absorbent to receive wound exudate to remove it from the healing site. Such wound dressings, i.e. wound dressings, essentially aid in wound healing, since in this way a relatively dry wound surface is always ensured, which can inherently heal faster. To achieve this goal, firstly, conventional materials have been woven in a certain way, and the background of the fabric has been coated with an absorbent layer. Due to the special way of weaving, the yarns of the fabric, when experienced, made relative movement with respect to each other and thus prevented the fabric from sticking to the wound. However, these relative movements slow down over time or eventually cease altogether, so that after a long time such wound dressings can also adhere to the wound.

Furthermore, it has been proposed to use metal films as wound dressings, in particular films of metals which, due to their oligodynamic properties, have a disinfecting effect on the wound, i.e. for example aluminum or silver films. The membranes were perforated to allow 2,59025 wound exudate to flow through, and their backing was coated with an absorbent layer. The disadvantages of such wound dressings are that, firstly, the perforation usually only allows insufficient removal of the wound exudate, that thin and especially very thin metal films are not very mechanically resistant, and that too strong an oligodynamic property not only destroys bacteria but may even disturb the wound to some extent. healing.

Because of these drawbacks, metal foils began to be replaced with a lattice, either by using a wire mesh or by providing a metal coating on the wire surface of the high-loop fabric. Although such wound dressings are sufficiently permeable to the wound exudate, due to the high loop, it is possible that the absorbent layer at the back will in turn come into contact with the wound, adhering to the wound, even if it is not adhered to the metal mesh or metallized mesh. Moreover, such wound dressings cause a certain mechanical irritation to the wound surface, which is of course not in accordance with the desired effects.

It has also been proposed to provide the fiber surfaces of the fibrous gauze layer with a thin metal coating and to coat the thin metallized fibrous gauze layer thus prepared with an absorbent layer. Although such a combination gave the best results so far, the metallization of the fibrous gauze layer was relatively difficult and complicated to perform. In order to provide the fiber surfaces with a thin metal coating, it was necessary to vaporize the metal in question in a vacuum. This is a work step that can only be performed with relatively high accuracy and, above all, only relatively slowly in an industrial volume.

In addition, there have already been known embossing layers of gauze with specially vaporized metal coatings, so that only local contact of the gauze layer with the wound surface is achieved. The background of these interest-printed and metal-vapor-coated gauze layers is similarly covered with absorbent layers. It is also known to provide the protrusions of the embossed surface of such gauze layers with an acrylic resin coating. This results in a structure partially coated with acrylic resin, the space between these points forming a channel system through which the wound exudate can flow and thus penetrate through the gauze layer into the absorbent layer. The acrylic resin sites themselves are impermeable to moisture.

.. 'Λ "' 3 59025

All of these known wound dressings have been shown to have significant drawbacks. For example, although dressings having a high-vacuum metal coating on a wound-facing surface do not adhere to the wound surface and, depending on the quality of the vaporized metal coating, have a more or less healing effect on the wound, evaporation of metal under high vacuum is relatively difficult and costly. , so that such wound dressings are quite expensive. Moreover, in such wound dressings, only the effect characteristic of the respective vaporized metal can be exploited, although in many respects it would be expedient to place other substances having healing and / or disinfecting properties on the surface of the non-adhesive dressing. A non-wound dressing with healing and / or disinfecting agents on its surface, which can also be prepared in an easy and inexpensive manner, is not yet known, although there is a real need for one.

It has now been found that in a substantially simpler way than previously known, a dressing can be provided which not only, as is already known, removes wound exudate quickly and safely from a wound, but can also contain on its surface any healing and / or disinfecting agents, and which in addition, bandages can be made substantially faster and cheaper than hitherto known bandages.

Accordingly, the present invention relates to a wound dressing covered with a coating of synthetic material on the side facing the wound and comprising a single or multi-layered layer of cellulose with possibly absorbent or reinforcing layer on the back or a thin layer of gauze with backable absorbent layer and back of the invention. is characterized in that the gauze or cellulose layer, respectively, is coated on the front side, i.e. on the side facing the wound, with a non-adhesive non-uniform acrylic resin layer, which in turn contains pigments such as zinc oxide, alumina, alumina or silver powder and / or other bacterial powder and that when the wound dressing is formed from the gauze layer, it consists of a thin reinforced fibrous gauze with a thickness of 0.02-0.5 mm and a weight per square meter of 12-60 g and consisting of strengths wettable and / or water repellent fibers of 1.5 to 12 denier.

59025 The backing of the fibrous gauze or cellulose layer thus formed is covered with an absorbent layer and applied to it either over its entire surface or only in places. When the thin reinforced fibrous gauze is assembled from wettable fibers, the acrylic resin coating on the individual fibers makes these fibers more or less water-repellent, while maintaining the space between the fibers and thus leaving a sufficient number of wound exudate penetration points. Water-repellent fibers can also be used as the wound dressing according to the invention, the materials of which are, for example, polyamides, polyesters, polyolefins and other plastics, as well as cellulose fibers which have been made water-repellent, e.g. by providing a silicone coating.

It is, of course, possible, though not necessary, to subject the cellulose used before pretreatment with an acrylic resin layer. Such a pretreatment can be considered, for example, by impregnation with an unfilled acrylic resin emulsion or solution, which treatment strengthens the cellulose layers mechanically but does not adversely affect their air or moisture permeability. It is further possible, as a pretreatment, to impregnate with another substance, e.g. a silicone solution or emulsion, thus making at least one layer of cellulose, namely the layer in the finished dressing against the wound, sufficiently water-repellent.

A special advantage of the wound dressing according to the invention is that it is prepared by a simple and inexpensive method by printing on a thin reinforced fibrous gauze using an acrylic resin emulsion containing the above-mentioned pigments or active ingredients. It is known that the pressure impregnation process can be carried out substantially cheaper than other impregnation methods and in particular much cheaper than the high-vacuum evaporation of the surface of the gauze layer. Accordingly, the present invention further comprises a process for preparing a binder characterized in that the cellulosic or gauze layer, respectively, is printed with an acrylic resin dispersion containing pigment- and / or bactericidal or anti-growth agents or other similar agents the gauze layer is joined on the back side to the absorbent layer, which is, for example, cellulose wadding, by sewing, welding, gluing or the like.

Suitable pigments are, in particular, solids which have a healing effect on the wound. Such solids are, for example, metal oxides such as, for example, zinc oxide or alumina, or also metals in powder form such as 5 59025, in particular aluminum powder or silver powder. As active ingredients, disinfectants such as e.g. sulfonamides or antibiotics. According to the method of the invention, the pigment particles or active substance particles are embedded in the acrylic resin layer and thus do not form any uniform coating in the sense known in the art; due to the fact that the individual particles are embedded in the acrylic resin layer, the wound dressing made according to the invention obtains even better flexibility. To prepare the binder of the invention, the background of the printed wound dressing surface using an acrylic resin dispersion is coated with a layer of any absorbent material, such as cellulose wadding, cotton gauze or the like, which is attached to the wound dressing. The joining can take place in a manner known per se, e.g. by welding when using wound dressings made of thermoplastic fibers, in other cases by gluing, sewing or the like. When the joining takes place by sewing, it is most conveniently carried out with water-repellent yarns which have also been treated with a corresponding acrylic resin dispersion.

The following examples further illustrate, but do not limit, this invention.

Example 1

The thermally bonded gauze layer of polyamide fibers having a thickness of 2.5 denier and a thickness of 0.07 mm was printed using a dispersion of polyacrylic isobutyl ester. The dispersion had the following composition:

15 parts by weight of polyacrylic isobutyl ester

Zinc oxide 15 parts by weight

Water 69 parts by weight

Commercial Dispersant 1 part by weight The background of the wound cover layer thus obtained was coated with an absorbent layer made of knitted cellulose fiber wool gauze having a thickness of 10 mm and a weight per square meter of 360 g, and joined to the absorbent layer by weld seams such as stitch sutures. This gave a binder which, as the experiments showed, did not adhere to the wound and produced an obvious wound healing effect.

Example 2

The procedure was as in Example 1, except that an acrylic resin dispersion having the following composition was used: Polyacrylic isobutyl ester 15 parts by weight 6 59025

10 parts by weight of aluminum powder

74 parts by weight of water

Commercial dispersant 1 part by weight

The backing of the printed gauze layer was coated with a cellulose wadding layer having a thickness of about 5 mm and a weight per square meter of 240 g, and the layers were sewn together like a stitching stitch with polyamide yarns dipped in a dispersion similar to that used in printing. The background coated binder thus also showed to have excellent healing properties. The production speed in printing was 50 m / minute.

Example 3

The procedure of Example 1 was repeated except that an acrylic resin dispersion having the following composition was used: 15 parts by weight of polyacrylic isobutyl ester

10 parts by weight of a 1% aqueous solution of phenylmercuric borate

75 parts by weight of water

The printing of the gauze layer was performed at a production speed of 50 m / minute; further processing took place as in Example 2. The binder obtained showed excellent healing properties and no adhesion to the wound occurred in any case.

Example 4 A 2-layer cellulose web having a basis weight of 22 g is impregnated with an acrylic resin dispersion by passing the web through a submersible bath. Excess impregnant is removed by compression, and the cellulosic web is passed over several drying cylinders, each cylinder having a temperature of 120 ° C.

The impregnated cellulosic web thus obtained is then embossed using an embossing cylinder heated to 110 ° C, the shaft ends of which are loaded with a force of 4 to 6 tons. Heel Printing can be performed by pressing so deeply that the cellulosic web becomes perforated in the form of pores (or small slits). The purpose of this is to increase the liquid permeability.

This chemically bonded cellulosic web is then printed using a dispersion of the active ingredient in a polyacrylic isobutyl ester. The dispersion has the following composition:

Polyacrylic isobutyl ester 15 parts by weight

Zinc oxide 15 parts by weight

Water 69 parts by weight

Dispersant 1 part by weight 7 59025

The background of the wound dressing layer was coated with an absorbent gauze layer. The binder thus obtained does not adhere to the wound and appears to be healing.

Example 5

The procedure was as in Example *, except that an acrylic resin dispersion having the following composition was used for printing: 15 parts by weight of polyacrylic isobutyl ester

10 parts by weight of aluminum powder

Water 7 ^ parts by weight

Dispersant 1 part by weight The backing of the wound cover thus obtained was coated with a cellulose layer having a thickness of 5 mm and a basis weight of 1 x 0, and the layers were joined together by heel printing. using.

This binder also showed excellent healing properties. The production speed in printing was 50 m / minute. Example 6

The procedure was as in the example, except that an acrylic hafcid dispersion having the following composition was used: 15 parts by weight of polyacrylic isobutyl ester

10 parts by weight of a 1 wt aqueous solution of phenylmercuric borate

75 parts by weight of water In this case, however, the heel printing was omitted before printing; the impregnated cellulose web was printed on both sides, in each case at a speed of 50 m / min. Also in this case, a binder with excellent healing properties was obtained.

Example 7

Initially, the procedure was the same as in the first step of Example 1, although using a single-layer cellulose web with a backing coated with a thin layer of fibrous gauze formed of polyamide fibers having a thickness of 2.5 denier and a thickness of 0.07 mm. After impregnating puserruspoiston give a bond material having a sel-luloosapuolen surface was performed immediately, bypassing korkopainantatyövaihe, printing using a dispersion containing the active ingredients described in the example. Printing was performed by the screen printing method, resulting in a non-uniform printing cover. The binder obtained shows that, in addition to its healing properties, it also has excellent strength properties, especially when wet.

Claims (6)

8 59025 A wound dressing covered with a coating of synthetic material on the side facing the wound and consisting of a single or multi-layered layer of cellulose with a possibly absorbent or reinforcing layer on the back side or a thin gauze layer with a possibly absorbent layer on the back side, characterized in that the gauze correspondingly, the cellulose layer is coated on the front side, i.e. on the side facing the wound, with a non-adhesive non-adhesive acrylic resin layer, which in turn contains pigments such as zinc oxide, alumina, aluminum powder or silver powder and silver powder and / or other this consists of a thin reinforced fibrous gauze with a thickness of 0.02 to 0.5 mm and a weight per square meter of 12 to 60 g, made up of wettable and / or water-repellent fibers with a thickness of 1.5 to 12 denier. A wound dressing according to claim 1, characterized in that the cellulose layer is further impregnated with acrylic resin, silicone resin or the like. A wound dressing according to claim 1, characterized in that the fibers of the fibrous gauze comprise siliconized cellulose fibers. A method for producing a wound dressing according to claim 1 or 2 or claims 1 and 3, respectively, characterized in that the cellulose or gauze layer, respectively, is printed with an acrylic resin dispersion containing pigment- and / or bactericidal or growth-inhibiting agents or other similar substances. in the form of a gauze layer, the gauze layer coated with the acrylic resin dispersion is joined on the back to an absorbent layer, such as cellulose wadding, by sewing, welding, gluing or the like. Pat.entkrav 1. Särförband, som pä den mot säret vända sidan är belagt med ett överdrag av synthetmaterial och som bestär av en- eller flerlagrt cellstoffskikt, at eventuellt pä baksian är försett med ett absorberande respektive förstärkande skikt eller av ett tund flor.skikt som baksidan is not worn with absorptions, 'y