Wound dressing

Abstract

Wound dressing (10, 100, 200, 300), comprising a single or multi-layered activated carbon layer (12), such as activated carbon fabric, knitted fabric, non-woven fabric or mesh fabric, with a wound-facing front side and a wound-away back side, characterized in that a spacer structure (14) made of non-resorbable material is applied to the front side of the activated carbon layer (12), covering the front side only in certain areas, and which is formed by strip- or thread-shaped grids or nets and / or wavy or zigzag-shaped stripes (116, 118, 120, 122, 124, 126) or threads and / or dot-shaped elevations made of the non-resorbable material.

Description

[0001] The invention relates to a wound dressing comprising a single- or multi-layer activated carbon layer, such as activated carbon woven fabric, knitted fabric, scrim or mesh fabric with a front side facing the wound and a back side facing away from the wound.

[0002] EP 0 749 295 B1 discloses an absorbent article, such as a sanitary napkin, consisting of an apertured topsheet, a liquid-impermeable backsheet, and an absorbent core. The absorbent core may contain activated carbon.

[0003] A wound dressing according to EP 0 026 572 B1 consists of an opening-containing healing and absorbent layer, an adjacent layer made of carbon fabric and a backing layer.

[0004] According to WO 2013 / 028966 A2, an activated carbon layer is arranged between two perforated layers to form a wound dressing.

[0005] DE 10 2007 054 127 A1 describes a hygiene or care article which comprises a wound exudate-absorbing body and a cover which is made of permeable material and which may, for example, have a punched pattern.

[0006] The subject of DE 10 2006 017 194 A1 is a primary dressing that allows for spacing from a secondary dressing. The secondary dressing has perforations.

[0007] According to the state of the art, wound dressings are covered completely or to a significant extent by a layer running along the wound side, so that the binding of odors and bacteria as well as other pathogens and toxins is impaired by the activated carbon layer.

[0008] The present invention is based on the object of developing a wound dressing of the type described above in such a way that an optimal effect of the activated carbon layer is possible, but at the same time it is ensured that the activated carbon layer cannot adhere to the wound.

[0009] To achieve the object, the invention provides that a spacer structure made of non-absorbable material is applied to the front side of the activated carbon layer, which spacer structure covers the front side exclusively in regions and is formed by strip- or thread-shaped grids or nets and / or wavy or zigzag-shaped strips or threads and / or point-shaped elevations made of the non-absorbable material.

[0010] According to the invention, the activated carbon layer is only covered to such an extent that direct contact with a wound is avoided. This allows odor and bacteria to be bound to a considerably greater extent than is the case with state-of-the-art wound dressings.

[0011] In order to ensure that residues of carbon fibers cannot penetrate into the wound, which may originate in particular from the ends of the carbon fibers, it is provided that the wound dressing comprises an adhesive material that only covers the edge of the activated carbon layer all the way around, wherein the adhesive material forms a frame.

[0012] The front side of the activated carbon layer uncovered by the frame is referred to as the effective area of ​​the wound dressing. The spacer structure should cover a maximum of 50%, preferably a maximum of 20%, and particularly preferably a maximum of 15% to 10% of the effective area of ​​the wound dressing.

[0013] According to the invention, a wound dressing is provided that is effective over almost the entire surface without the risk of adhesion to a wound. For this purpose, the spacer structure is provided, which is formed by a grid or mesh consisting of strips or threads of the non-absorbable material. Other structures, such as waves formed by strips or threads, zigzag lines, or even point-like elevations made of the non-absorbable material, are also possible to form the spacer structure.

[0014] The non-absorbable material is in particular silicone or a material siliconized on the outside.

[0015] It is also possible that the non-resorbable material is at least one material from the group of polyamide, polyester, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, silk, metal wire, such as titanium-coated steel wire.

[0016] The material covering the edge of the activated carbon layer is typically made of silicone or a siliconized material. Other suitable adhesive materials used in the medical field, such as those based on polyacrylate, are also possible.

[0017] In particular, it is provided that the frame extends along the back of the carbon layer so that the effective area is equal to that of the area of ​​the activated carbon layer.

[0018] However, it is also possible to apply the adhesive material to the front.

[0019] In a further development of the invention, the adhesion material can also be a portion of the spacer structure. For this purpose, the free ends of the activated carbon threads are covered by a strip of non-absorbable material forming a frame, with the strips simultaneously ensuring the adhesive effect on the skin.

[0020] Of course, it is also possible for the adhesive material forming the frame to extend along both the front and back of the activated carbon layer.

[0021] It is also possible that the back of the activated carbon layer is covered by an absorbent absorbent body.

[0022] The prerequisite for the non-resorbable material is that it is bonded to the activated carbon layer to the required extent so that it cannot come loose during use.

[0023] The threads or strips can have a diameter D of 0.5 mm ≤ D ≤ 1.0 mm, in particular 0.6 mm ≤ D ≤ 0.8 mm, without this limiting the invention. The spacing of the threads or strips should be selected such that the desired uncovered effective area of ​​the activated carbon layer is available, in particular in the range between 85% and 95%.

[0024] In particular, the spacing d of the threads or stripes in a square grid is 5 mm to 10 mm, preferably 8 mm.

[0025] When using flowable material, the spacer structure can be applied to the activated carbon layer by screen printing or 3D printing.

[0026] Further details, advantages and features of the invention emerge not only from the claims and the features derived therefrom - individually and / or in combination - but also from the following description of preferred embodiments.

[0027] They show: Fig. 1 an exploded view of a first embodiment of a wound dressing, Fig. 2. the wound dressing according to Fig. 1 in plan view, Fig. 3 the wound dressing according to Fig. 1 and Fig. 2 in exploded view, Fig. 4. an exploded view of a second embodiment of a wound dressing, Fig. 5 the wound dressing according to Fig. 4 in plan view, Fig. 6 the wound dressing according to Fig. 4 and Fig. 5 in rear view, Fig. 7 the wound dressing according to Fig. 4 to 6 in exploded view, Fig. 8 Principle representations of top views of wound dressings with spacer structures made of non-absorbable material, Fig. 9 an exploded view of a third embodiment of a wound dressing, Fig. 10 the wound dressing according to Fig. 9 in plan view, Fig. 11 the wound dressing according to Fig. 9 and Fig. 10 in rear view, Fig. 12 the wound dressing according to Fig. 9 to 11 in exploded view, Fig. 13 a fourth embodiment of a wound dressing in exploded view, Fig. 14 the wound dressing according to Fig. 13 in plan view, Fig. 15 the wound dressing according to Fig. 13 and Fig. 14 in rear view and Fig. 16 the wound dressing according to Fig. 13 to 15 in exploded view.

[0028] The figures show various embodiments of wound dressings, whereby the same reference numerals are generally used for the same elements.

[0029] A characteristic of all wound dressings is that the activated carbon layer used to bind odors and bacteria, as well as other pathogens and toxins, is only covered to a limited extent, meaning that it can preferably cover up to 90 to 95% of the surface area. However, to prevent the activated carbon layer from adhering to a wound, a spacer structure is provided, which is applied to the activated carbon layer on the wound side.

[0030] The Fig. 1 to 3 show a first embodiment of a wound dressing 10 which has an activated carbon layer 12 which can be formed in one or more layers.

[0031] The activated carbon layer 12 consists of carbon fibers from which, for example, a woven fabric, a knitted fabric, a scrim or a knitted fabric is formed to form the activated carbon layer 12.

[0032] To prevent contact between the activated carbon layer 12 and a wound, a spacer structure covering the activated carbon layer 12 exclusively in certain areas is applied to the side of the activated carbon layer 12 facing the wound, i.e., the front side. In the exemplary embodiment, this spacer structure has the form of a grid 14 according to the invention. This grid can be applied to the activated carbon layer 12, for example, by screen printing or 3D printing. Other suitable methods are also possible.

[0033] The grid 14 consists of threads or strips with a diameter of preferably between 0.5 mm and 1.0 mm, in particular between 0.6 mm and 0.8 mm. The spacing between the parallel longitudinal and transverse threads or strips is between 5 mm and 10 mm.

[0034] In particular, the diameters of the threads or strips are matched to the distance between them in such a way that the effective activated carbon layer area running on the wound side and not covered by an adhesive layer forming a frame 16 is covered by the grid 14 by less than 50%, preferably less than 20%, in particular less than 15-10%.

[0035] The grid 14 consists of a non-absorbable material, in particular of silicone or a material that is siliconized on the circumference.

[0036] Materials such as polyamide, polyester, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, silk, and metal wire, such as titanium-coated steel wire, could also be considered. However, the prerequisite is that they are fixed to the activated carbon layer 12.

[0037] To adhere the wound dressing 10 to the skin, a layer of adhesive material, e.g., silicone, polyacrylate, or other suitable material, is applied to the wound side, forming the frame 16 to ensure the required adhesive effect. The frame 16 simultaneously covers the edge of the activated carbon layer 12, so that fiber or carbon residues are bound and thus cannot penetrate the wound.

[0038] The wound dressing 10 is in Fig. 2 in plan view. It can be seen that the frame 16 is virtually flush with the outside edge of the activated carbon layer 12, i.e., it does not protrude laterally beyond the edge of the activated carbon layer 12. This is particularly evident by the Fig. 3 illustrates this.

[0039] A second embodiment of a wound dressing 100 is Fig. 4 to 7. This differs from that of the Fig. 1 to 3 in that the frame 116, which is made of silicone material in particular, extends over the peripheral edge 22 of the activated carbon layer 12, as can be seen from the Fig. 5, Fig. 6 and Fig. 7 results.

[0040] Irrespective of this, the example also shows the Fig. 4 to 7, the spacing structure has the form of a grid 14. Rather, other spacing structures can also be selected, such as the one shown in the Fig. 8. Thus, a grid structure 114 can be provided which is characterized by vertically intersecting stripes or threads 116, 118 which enclose a rectangle (right illustration of Fig. 8). The strips or threads may have different diameters. Some of the threads or strips may also be thick enough to create an adhesive effect.

[0041] In the middle representation of the Fig. 8, a spacing structure is achieved by zigzag-shaped threads or strips 120, 122 which run parallel to each other.

[0042] In the left illustration of the Fig. 8, strips or threads 124, 126 of wave-shaped geometry are applied to the activated carbon layer 12 to form the desired spacing structure.

[0043] A spacing structure can also be created using a dot pattern.

[0044] Independently of this, it can be seen that the activated carbon layer 12 is covered at the edges by a frame which achieves an adhesive effect, as explained above.

[0045] As can be seen from the Fig. 7, the frame 116 is geometrically adapted to the activated carbon layer 12 in such a way that the former runs partly inside the activated carbon layer 12 and partly outside of it, as can be seen in particular from the Fig. 7 is recognizable.

[0046] Another embodiment of a wound dressing 200 is the Fig. 9 to 12. This differs from the previous ones in that a frame element 16, 216 is provided along both the front and the back of the activated carbon layer 12, which frame element covers the peripheral edge 22 of the activated carbon layer 12. As in the previous embodiments, the edge region of the spacer structure is also covered, which in the wound dressing 200 is also designed as a grid. The structure also results in particular from the Fig. 12.

[0047] A wound dressing 300 according to the Fig. 13 to 16 is characterized in that it is covered on the back by an absorbable flat layer 302, which is fixed by means of the adhesive layer 16 designed as a frame. Otherwise, a structure results as described in connection with the embodiments of the Fig. 1 to 12 have been explained.

Claims

[1] Wound dressing (10, 100, 200, 300), comprising a single- or multi-layer activated carbon layer (12), such as activated carbon woven fabric, knitted fabric, scrim or mesh fabric, with a front side facing the wound and a back side facing away from the wound, characterized by that on the front side of the activated carbon layer (12) there is applied a spacer structure (14) made of non-absorbable material which covers the front side exclusively in regions and which is formed by strip- or thread-shaped grids or nets and / or wavy or zigzag-shaped strips (116, 118, 120, 122, 124, 126) or threads and / or point-shaped elevations made of the non-absorbable material. [2] Wound dressing according to claim 1, characterized by that the wound dressing (10, 100, 200, 300) comprises adhesive material (16) covering an edge of the activated carbon layer (12) all around. [3] Wound dressing according to claim 2, characterized bythat the adhesion material forms a frame (16) and that the front side of the activated carbon layer (12) uncovered by the frame is the effective area of ​​the wound dressing, which is covered by the spacer structure (14) to a maximum of 50%, preferably a maximum of 20%, particularly preferably a maximum of 15% to 5%. [4] Wound dressing according to one of the preceding claims, characterized by that the non-absorbable material is silicone or externally siliconized material. [5] Wound dressing according to one of claims 1-3, characterized by that the non-resorbable material is at least one material from the group polyamide, polyester, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, silk, metal wire, such as titanium-coated steel wire. [6] Wound dressing according to one of claims 2-5, characterized by that the frame extends along the front and / or back of the activated carbon layer (12). [7] Wound dressing according to one of the preceding claims, characterized by that the activated carbon layer (12) is covered on the back by an absorbent layer (302). [8] Wound dressing according to one of the preceding claims, characterized by that the threads or strips (114, 116, 118, 120, 122, 124, 126) have a diameter D of 0.5 mm ≤ D ≤ 1.0 mm, in particular 0.6 mm ≤ D ≤ 0.8 mm.

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