Wound dressing having a fixing region for a cannula or a tube

Abstract

The invention relates to a wound dressing comprising an absorption core, a hydrophobic nonwoven layer, and a hydrophilic nonwoven layer. The hydrophobic nonwoven layer and the hydrophilic nonwoven layer are connected by means of an ultrasonic weld seam and form a pocket in which the absorption core is enclosed, the absorption core comprising an absorbent fibrous material and a superabsorbent polymer, and the wound dressing comprises a fixing region, the fixing region comprising three cutting lines which extend from a point and cut through the wound dressing perpendicularly to the surface thereof. At least two of the cutting lines do not extend to an outer edge of the wound dressing. The hydrophobic nonwoven layer and the hydrophilic nonwoven layer comprise plastic fibers made of the same material.

Description

[0001] Ref. 93240826-II-WO-PCT - October 16, 2025

[0002] Title: Wound dressing with a fixation area for a cannula or tube

[0003] Description

[0004] The present invention relates to a wound dressing and a system for fixing objects, in particular cannulas and tubes, at an entry point on the body of a patient.

[0005] Medical procedures requiring the insertion of cannulas or tubes into a patient's body are common in modern medicine. While most of these procedures result in only minimally exuding wounds at the cannula or tube entry point, procedures such as tracheotomy or wound drainage may require more absorbent dressings.

[0006] A tracheotomy involves surgically inserting a cannula into the trachea to keep the airway open. This procedure is often necessary for patients who require long-term mechanical ventilation or whose upper airways are blocked.

[0007] Wound drainage is usually used after surgical procedures. Tubes are inserted into wounds to drain blood and wound exudate.

[0008] Existing solutions for fixing objects, especially tubes, at the entry point include, for example, multi-layered gauze bandages attached with adhesive strips or foam wound dressings.

[0009] For entry points on the body where significant fluid discharge is possible, wound dressings containing superabsorbent polymer (SAP) are known in the prior art. WO 2007 / 118636 A1 describes a wound dressing with two absorbent cores connected by an intermediate strip. Both absorbent cores contain SAP. This design means that either the diameter of the applied tube is limited, or, if a wider connecting strip is used, the two absorbent cores are positioned further away from the entry point. As a result, wound exudate is absorbed more slowly by the dressing.

[0010] The object of the present invention is therefore to provide a highly absorbent wound dressing for the treatment of wounds with protruding cannulas or tubes, which can quickly and reliably absorb wound exudate and prevent leakage of the dressing. The dressing should also be suitable for various cannula and tube sizes and minimize the risk of skin irritation.

[0011] This problem is solved by a wound dressing comprising an absorbent core, a hydrophobic nonwoven layer, and a hydrophilic nonwoven layer, wherein the hydrophobic and hydrophilic nonwoven layers are joined at their edges by means of an ultrasonic weld, forming a pocket. The absorbent core comprises an absorbent fiber material, in particular a cellulose-based fiber material, and a superabsorbent polymer, in particular SAP particles, and is enclosed in the pocket between the hydrophobic and hydrophilic nonwoven layers.

[0012] The wound dressing according to the invention is characterized in that the wound dressing comprises a fixation area, wherein the fixation area includes three cutting lines emanating from a point. The point is preferably located in a central area of ​​the wound dressing. The point is preferably at least 2 cm from the entire outer edge of the wound dressing, and in particular 3 cm from the entire outer edge of the wound dressing. The cutting lines pierce the wound dressing perpendicular to its surface, with at least two of the cutting lines not extending to an outer edge of the wound dressing. In a preferred embodiment, exactly three cutting lines emanate from the point in the fixation area. In particular, the cutting lines form a Y-shaped cut.

[0013] Furthermore, according to the invention, the hydrophobic nonwoven layer and the hydrophilic nonwoven layer comprise plastic fibers made of the same material.

[0014] When using the present invention, the areas of the wound dressing adjacent to the point of intersection are folded to the side, creating an opening through which an object, such as a drainage or tracheostomy tube, can be inserted. This cut shape allows for adaptation to the diameter of the tube. Simultaneously, the upwardly folded areas of the wound dressing conform to the tube, thus partially closing the dressing. This is not possible if the wound dressing only has a single opening, for example, a circular one, to accommodate the tube.

[0015] Furthermore, in the present invention, the absorbent core is advantageously arranged directly at the entry point. Fluid leakage is most likely at this entry point during drainage or tracheotomy. A bridge between two absorbent cores, which is less absorbent, can act as a channel for the leaking fluid, directing wound exudate to the edges of the dressing and thus contributing to dressing leakage. In the present invention, however, the entry point of the tube is largely surrounded by the absorbent core. Therefore, the dressing can absorb the leaking fluid more quickly and retain it. This reduces the risk of dressing leakage. The absorption capacity is further enhanced by the use of SAP in the absorbent core. The dressing according to the invention therefore absorbs and retains wound exudate quickly and reliably.The fluid absorbed by the wound dressing is not released again, even under pressure.

[0016] Any two of the cutting lines emanating from a point form an angle. Preferably, at least two of the angles are of the same size. All angles are advantageously greater than 60°. In one embodiment, each angle between two cutting lines is between 100° and 140°, preferably between 110° and 130°, and particularly about 120°.

[0017] In a preferred embodiment, one of the cutting lines can extend to the outer edge of the wound dressing. This makes it easier to apply the wound dressing around a tube, as the tube can be guided through this cut to the center of the fixation area.

[0018] The hydrophobic and hydrophilic nonwoven layers are joined by ultrasonic welding to form a pocket. The weld typically seals the dressing along its entire circumference, following the outer edge of the dressing and the cut lines. Advantageously, the dressing is welded on both sides of the cut lines, allowing the pocket to be completely closed. The pocket thus encloses a single, continuous space. The absorbent core enclosed within this pocket is preferably a single piece, so that the entire dressing contains only one absorbent core.

[0019] The weld seam created by the welding process is harder and stiffer than the unprocessed nonwoven layers. If such a weld seam lies directly on sensitive skin areas, such as around the insertion point of the tube, this can lead to skin irritation. In the present invention, the weld seam typically follows the outer edge of the wound dressing and also joins the hydrophilic and hydrophobic nonwoven layers on both sides of the cut lines. When using the wound dressing according to the invention, the areas of the dressing adjacent to the cut point are folded upwards and away from the insertion point of the tube, creating a recess that can accommodate the tube. This also directs the weld seams away from the insertion point of the tube. Therefore, the arrangement of the cut lines in the fixation area contributes to improved wearing comfort.

[0020] According to the invention, the hydrophilic and hydrophobic nonwoven layers comprise plastic fibers made of the same material. These plastic fibers typically exhibit thermoplastic properties. Since the plastic fibers in both layers have the same melting point, the welding process can take place within a narrower energy range. This allows the weld seam to be narrower without compromising its strength. Consequently, the weld seam can cover a smaller area, and the flexibility of the wound dressing is improved compared to a dressing with wider weld seams. In particular, the dressing is more flexible in the fixation area, and the thinner weld seams around the cut lines of the tube entry point allow the areas of the dressing in contact with the tube to bend easily without exerting pressure on the tube.Thus, the feature of identical plastic fibers works synergistically with the arrangement of the cutting lines in the fixing area.

[0021] Similarly, the distance between the wound site, which lies in the area of ​​the tube's entry point, and the absorption core is further reduced, thus improving the absorption properties of the wound dressing.

[0022] To enable this advantageous welding, the hydrophilic nonwoven layer and the hydrophobic nonwoven layer can advantageously each contain at least 30 wt.%, preferably at least 40 wt.%, more preferably at least 50 wt.%, and particularly at least 60 wt.% of plastic fibers. In one embodiment, the hydrophilic and the hydrophobic nonwoven layers contain different amounts of the plastic fibers. For example, the hydrophobic nonwoven layer can contain at least 90 wt.% of the plastic fibers, while the hydrophilic nonwoven layer can contain between 50 and 70 wt.% of the plastic fibers. Preferably, the hydrophilic nonwoven layer comprises 60 to 70 wt.% polypropylene fibers and 30 to 40 wt.% viscose fibers.

[0023] All weight percent values ​​in this document refer to the total weight of the respective layer, unless otherwise stated.

[0024] Similarly, the plastic fibers of the hydrophilic and hydrophobic nonwoven layer preferably have the same diameter and / or length.

[0025] The hydrophilic non-woven layer serves as the wound contact layer and, together with the hydrophobic non-woven layer, encloses the absorbent core. Therefore, when using the wound dressing, it is positioned on the wound side. The hydrophilic non-woven layer is permeable to fluid, allowing wound exudate to pass from the wound to the absorbent core.

[0026] The hydrophilic nonwoven layer preferably comprises a mixture of synthetic fibers and cellulose-based fibers. The synthetic fibers are a fully synthetic material. The hydrophilic nonwoven layer can, for example, consist of 60 to 70 wt% synthetic fibers and 30 to 40 wt% cellulose-based fibers. In particular, the hydrophilic nonwoven layer can consist of approximately 64 wt% synthetic fibers and approximately 36 wt% cellulose-based fibers.

[0027] In a particularly preferred embodiment, the hydrophilic nonwoven layer has a two-layer structure, consisting of an inner and an outer nonwoven layer. The inner nonwoven layer forms part of the inside of the pocket and consists of synthetic fibers and cellulose-based fibers. The outer nonwoven layer forms part of the outside of the pocket and consists of a nonwoven fabric made of synthetic fibers. The outer nonwoven layer of the hydrophilic nonwoven layer can be positioned on the wound side and exhibit atraumatic properties, meaning that the hydrophilic nonwoven layer does not adhere to the wound and can be removed gently and painlessly. The inner and outer nonwoven layers can be bonded together by applying heat. The inner nonwoven layer can consist of 35 to 45 wt.% synthetic fibers and 55 to 65 wt.% cellulose-based fibers.In particular, the inner nonwoven layer can consist of approximately 40 wt.% synthetic fibers and approximately 60 wt.% cellulose-based fibers. The inner and outer nonwoven layers together can consist of 60 to 70 wt.% synthetic fibers and 30 to 40 wt.% cellulose-based fibers, as already mentioned in relation to the (entire) hydrophilic nonwoven layer.

[0028] The hydrophilic nonwoven layer can have a basis weight of 25 to 50 g / m². 2 , preferably 40 to 50 g / m² 2 and in particular of about 45 g / m² 2 exhibit.

[0029] The hydrophobic nonwoven layer is essentially impermeable to fluids. This prevents the fluid absorbed by the absorbent core from escaping the wound dressing.

[0030] The hydrophobic nonwoven layer preferably comprises plastic fibers. In a particularly preferred embodiment, the hydrophobic nonwoven layer can consist exclusively of plastic fibers. Preferably, the hydrophobic nonwoven layer has a basis weight of 20 to 50 g / m². 2 , preferably from 20 to 30 g / m² 2 and in particular of about 25 g / m² 2 A lower weight per unit area can increase the breathability and adaptability of the wound dressing.

[0031] In a preferred embodiment, the plastic fibers contained in the hydrophilic and hydrophobic nonwoven layers consist of acrylonitrile butadiene styrene (ABS), polyamide (PA), polylactic acid (PLA), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), polyetheretherketone (PEEK), or polyvinyl chloride (PVC). Preferably, the plastic fibers contained in the hydrophilic and hydrophobic nonwoven layers consist of polyamide (PA), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), or polyvinyl chloride (PVC). In particular, the plastic fibers contained in the hydrophilic and hydrophobic nonwoven layers consist of polypropylene.

[0032] The hydrophilic nonwoven layer and the hydrophobic nonwoven layer have essentially the same geometric shape and dimensions.

[0033] The absorption core is enclosed in the pocket formed by the hydrophobic and hydrophilic nonwoven layers. The absorption core comprises an absorbent fiber material, such as cellulose fibers, and a superabsorbent polymer (SAP), such as a polyacrylate. In particular, the SAP consists of SAP particles. In a preferred embodiment, the cellulose fibers form a fluff into which SAP particles are embedded.

[0034] The use of such an absorbent core, and in particular the use of fluff within the core, has the further beneficial effect of providing additional cushioning around the insertion point of the tube. This reduces the pressure exerted on the wound site, for example, by the tube or a fixation device such as a bandage. This significantly increases wearing comfort, especially during long-term use.

[0035] The SAP particles are preferably distributed uniformly throughout the volume of the absorption core. The absorption core can, for example, comprise 30 wt.% to 60 wt.% SAP particles and 40 wt.% to 70 wt.% absorbent fiber material. Preferably, the absorption core comprises 40 wt.% to 50 wt.% SAP particles and 50 wt.% to 60 wt.% absorbent fiber material.

[0036] To ensure a more even distribution of wound exudate and thus better utilization of the absorbent core's capacity, the absorbent core can be enclosed by a distribution layer. This distribution layer is positioned both between the absorbent core and the hydrophobic nonwoven layer, and between the absorbent core and the hydrophilic nonwoven layer. The distribution layer can be designed as a closed shell or an open covering around the absorbent core. The closed shell and the open covering can be created, for example, by cutting and / or welding the distribution layer folded around the absorbent core. The distribution layer consists of a fluid-permeable and water vapor-permeable material, such as a hydrophilic cellulose fabric or a cellulose nonwoven.

[0037] The absorption core can achieve a suction power of at least 50 g / 100 cm². 2, preferably of at least 100 g / 100 cm² 2 and in particular of at least 140 g / 100 cm² 2 , measured according to DIN EN 13726-1 :2002-06 (Chapter 3.2). These high absorption capacities can be easily achieved by using a suitable quantity of SAP particles in the absorption core. The absorption capacity of the core can reach a maximum of 220 g / 100 cm². 2 , 250 g / 100 cm 2 or 300 g / 100 cm 2 , measured according to DIN EN 13726-1 :2002-06 (Chapter 3.2). Preferably, the absorption core has an absorption capacity of 140 g / 100 cm². 2 up to 220 g / 100 cm 2, measured according to DIN EN 13726-1 :2002-06 (Chapter 3.2). Essentially, the absorbent core can follow the shape of the wound dressing. Furthermore, the absorbent core can advantageously fill the pocket formed by the hydrophobic and hydrophilic nonwoven layers. However, the absorbent core typically expands upon absorbing fluid. This increase in volume should be taken into account when dimensioning the absorbent core in its dry state, ensuring that the dry core does not completely fill the pocket.

[0038] In one embodiment, the outer edge of the absorption core, when dry, is at most 10 mm, preferably at most 5 mm, and particularly at most 3 mm away from the inner edge of the pocket enclosing the absorption core. This applies to the entire circumference of the absorption core.

[0039] In an alternative embodiment, at least 60%, for example 60 to 99%, of the base area of ​​the pocket is covered by the absorption core in the dry state. Preferably, 70 to 98%, in particular 80 to 95% or 80 to 90%, of the base area of ​​the pocket is covered by the absorption core in the dry state.

[0040] In another embodiment, the volume of the absorption core and the preferably present distribution layer completely fills the volume of the pocket into which they are placed when the absorption core has reached 100% of its filling capacity.

[0041] In a preferred embodiment, the absorption core is located at most 10 mm from the cutting lines. More preferably, the absorption core is located at most 5 mm, and particularly at most 3 mm, from the cutting lines. Due to the short distance between the absorption core and the entry point of a tube or cannula, wound exudate can be quickly absorbed by the absorption core.

[0042] To secure the dressing at the entry point, it can have additional adhesive layers. For example, in one embodiment, the dressing may have an additional adhesive wound contact layer attached to the hydrophilic non-woven layer. This wound contact layer is typically perforated, allowing wound exudate to penetrate the absorbent core through the perforations and the hydrophilic non-woven layer. In particular, the wound contact layer is a siliconized layer. Such siliconized wound contact layers can advantageously be designed to be atraumatic. Furthermore, the dressing may have an additional adhesive wound covering layer attached to the hydrophobic non-woven layer. This wound covering layer is generally waterproof and permeable to water vapor.

[0043] If present, the wound covering layer and the wound contact layer can extend beyond the perimeter of the layers they enclose, forming an adhesive edge of the dressing, with the wound covering layer and the wound contact layer being bonded together in this edge area. This edge area is designed to come into contact with the intact skin surrounding the wound and to fix the dressing to the wound site or entry point. The preferably present silicone component of the wound contact layer acts as an atraumatic adhesive and is responsible for the dressing's self-adhesive properties.

[0044] This allows the user to easily and quickly attach the wound dressing to the wound site or entry point without the need for additional fixation devices.

[0045] Preferably, the wound contact layer comprises a perforated polyurethane film. One side of the film, facing the hydrophilic non-woven layer, is coated with an acrylic adhesive that bonds the wound contact layer to the hydrophilic non-woven layer. An opposite side of the film is coated with a silicone gel, which is intended for direct contact with the wound and skin surface.

[0046] In this embodiment, the wound dressing typically includes a removable protective layer. This protective layer can be designed as a two-part film with peel-off tabs. The protective layer prevents contamination of the wound-contact layer during storage and improves the handling of the wound dressing. The protective layer is removed before using the wound dressing.

[0047] A system comprising the wound dressing and a fixation bandage can also be provided to secure the wound dressing. The fixation bandage can be medical adhesive tape.

[0048] The dressing can be heart-shaped. The fixation area is then located on the part of the dressing furthest from the pointed end, so that when the dressing is applied, the two sides of the heart are positioned on either side of the entry point. Alternatively, the outer edge of the dressing can also be oval, round, or rectangular. Shapes with curves, in particular, conform better to the patient's body and are therefore less likely to rub against clothing. However, the shape of the dressing's outer edge is not limited to these forms.

[0049] The present invention is illustrated below by way of example with Figures 1 to 3.

[0050] Figure 1 shows a cross-section of a wound dressing according to the invention.

[0051] Figure 2 shows a top view of a wound dressing according to the invention.

[0052] Figure 3 shows a cross-section of an embodiment of the wound dressing according to the invention comprising an additional wound contact layer and an additional wound covering layer.

[0053] The reference symbols in the illustrations have the following meaning:

[0054] 1,100 wound dressings

[0055] 2 hydrophobic nonwoven layer

[0056] 3, 4 hydrophilic nonwoven layer

[0057] 3 inner non-woven fabric layers

[0058] 4 outer non-woven layer

[0059] 5 ultrasonic weld

[0060] 6 bags

[0061] 7 Absorption core

[0062] 8 Distribution layer

[0063] 9 superabsorbent polymer particles

[0064] 10 Fluff made from cellulose fibers

[0065] 17 Wound dressing layer

[0066] 18 Wound contact layer

[0067] 19 Edge area

[0068] 20 protective layers

[0069] 22 Contour of the absorption core

[0070] 31 a, b, c Section lines

[0071] 41 inner edge of the ultrasonic weld

[0072] 42 outer edge of the ultrasonic weld

[0073] Figure 1 shows a cross-sectional illustration of an embodiment of the wound dressing 1 according to the invention. The wound dressing 1 comprises a hydrophobic nonwoven layer 2 made of polypropylene fibers. In the applied state, the hydrophobic nonwoven layer 2 is positioned away from the wound and forms the outermost layer of the wound dressing. The wound dressing 1 further comprises a hydrophilic nonwoven layer, which, according to the preferred embodiment shown in Figure 1, consists of two nonwoven layers 3 and 4 bonded together by heat. The inner nonwoven layer 3 consists of a mixture of polypropylene fibers and viscose fibers, preferably in a ratio of approximately 40 wt.% polypropylene fibers and approximately 60 wt.% viscose fibers. The outer nonwoven layer 4, on the other hand, consists exclusively of polypropylene fibers, similar to the hydrophobic nonwoven layer 2. Preferably, the inner and outer nonwoven layers 3 and 4 together thus consist of an average of approximately 64 wt.% polypropylene fibers.-% polypropylene fibers and approximately 36 wt% viscose fibers. The hydrophilic nonwoven layer 3, 4 faces the wound when the wound dressing 1 is positioned over the wound or entry point during wound treatment. The hydrophilic nonwoven layer 3, 4 forms the underside of the wound dressing 1 intended for direct wound contact and thus constitutes a wound contact layer of the wound dressing 1.

[0074] An ultrasonic weld 5 joins an edge of the hydrophobic nonwoven layer 2 and an edge of the hydrophilic nonwoven layer 3, 4, so that the hydrophobic nonwoven layer 2 and the hydrophilic nonwoven layer 3, 4 form a pocket 6. Within the pocket 6 is an absorption core 7, which is enclosed by a distribution layer of hydrophilic nonwoven 8 made of cellulose fibers. The absorption core 7 consists of a fluff of cellulose fibers 10 and superabsorbent polymer particles 9 based on polyacrylate. Preferably, the absorption core consists of 40 to 50 wt.% superabsorbent polymer particles and 50 to 60 wt.% cellulose fibers. The absorption core is very soft in the dry state, and the SAP particles are only loosely embedded in the fluff pulp.

[0075] The coating formed by the hydrophilic and hydrophobic nonwoven layer 2, 3, 4 holds the absorption core together.

[0076] During wound treatment, wound exudate enters the wound dressing 1 due to the absorbent and fluid-distributing properties of the hydrophilic non-woven layers 3, 4 and the distribution layer 8. The wound exudate is then bound in the absorbent core 7. The hydrophobic non-woven layer 2 prevents wound exudate from escaping the wound dressing 1 once the absorbent core 7 is saturated. The double-layered structure of the hydrophilic non-woven layers 3, 4 gives the wound dressing 1 atraumatic properties without impairing its absorbency and fluid distribution. The wound dressing 1 does not contain any adhesive on its outer surfaces. A fixation dressing, such as medical adhesive tape or a bandage, is used to secure the wound dressing 1 to the wound site or entry point.

[0077] The fixing area with the cutting lines provided according to the invention is not shown in Figures 1 and 3 for the sake of simplicity. It is shown and explained by way of example with reference to Figure 2.

[0078] Figure 2 shows a top view of the wound dressing 1 according to the invention.

[0079] The wound dressing 1 is heart-shaped and includes a fixation area for attaching objects such as drainage tubes or cannulas. This area is defined by three cutting lines 31 radiating from a single point. The cutting lines 31 pierce all layers of the wound dressing 1 perpendicular to its surface. The angle between each pair of cutting lines is approximately 120°.

[0080] The hydrophilic nonwoven layer and the hydrophobic nonwoven layer are joined on both sides of the cut lines 31 by means of an ultrasonic weld 5. This part of the ultrasonic weld 5 forms an inner edge of the ultrasonic weld 41. The outer perimeter of the wound dressing 1 is also joined by means of the ultrasonic weld, which forms the outer edge of the ultrasonic weld 42.

[0081] One of the cutting lines 31a is longer than the other two cutting lines 31b, 31c and extends to the outer edge 42 of the wound dressing 1.

[0082] The absorption core 7 also follows the shape of the pocket 6, which is formed by the hydrophobic nonwoven layer 2 and the hydrophilic nonwoven layers 3, 4 (not shown here), and fills it. The contour of the absorption core 7 is shown as a dashed line 22.

[0083] To apply the wound dressing 1, for example, for use in drainage or tracheotomy, the dressing is opened along the longer cut line 31a and placed around the tube at the entry point into the body. The areas of the wound dressing 1 adjacent to the cut point are folded to the side to create an opening through which the tube is passed. The upward-folded areas of the wound dressing 1 conform to the tube and partially close the opening in the dressing created by the tube. The dressing is then secured to the patient's body using a fixation bandage, such as medical adhesive tape. Figure 3 shows a wound dressing 100 according to a self-adhesive embodiment of the invention, which additionally comprises a wound covering layer 17 and a wound contact layer 18.Since the wound contact layer has adhesive properties, an additional fixation dressing is not necessary in this embodiment.

[0084] The wound cover layer 17 and the wound contact layer 18 enclose a wound pad as shown in Figure 1 and form the outermost layers of the self-adhesive wound dressing 100. The waterproof and water vapor-permeable wound cover layer 17 is attached to the hydrophobic non-woven layer 2. The wound contact layer 18 consists of a perforated polyurethane film, which is bonded on one side to the hydrophilic non-woven layer 3, 4 by means of an acrylic adhesive and is coated on the other side with a silicone gel. The silicone gel acts as an atraumatic adhesive and is intended for direct contact with the wound and skin surface. It gives the wound dressing 100 its self-adhesive properties.

[0085] The wound covering layer 17 and the wound contact layer 18 extend beyond the perimeter of the hydrophilic and hydrophobic nonwoven layers 2, 3, 4 and form an edge region 19 of the wound dressing 100. The wound covering layer 17 and the wound contact layer 18 are connected to each other in the edge region 19. The edge region 19 is placed on the intact skin surrounding the wound and serves to fix the wound dressing 100 to the wound site or entry point.

[0086] The wound dressing 100 comprises a removable protective layer 20. The protective layer 20 is a two-part film with peel-off tabs. The protective layer 20 protects the wound contact layer 18 from contamination during storage. The protective layer 20 is removed before using the wound dressing 100.

Claims

Patent claims 1. Wound dressing (1, 100) comprising an absorption core (7), a hydrophobic nonwoven layer (2) and a hydrophilic nonwoven layer (3, 4), wherein the hydrophobic nonwoven layer (2) and the hydrophilic nonwoven layer (3, 4) are joined by means of an ultrasonic weld (5) and form a pocket (6), wherein the absorption core (7) comprises an absorbent fiber material (10) and a superabsorbent polymer (9), and wherein the absorption core (7) is enclosed in the pocket (6) between the hydrophobic nonwoven layer (2) and the hydrophilic nonwoven layer (3, 4), characterized in that the wound dressing (1, 100) comprises a fixation area, wherein the fixation area comprises three cutting lines (31a, 31b, 31c) extending from a point, which cut through the wound dressing (1, 100) perpendicular to its surface, wherein at least two of the cutting lines (31b, 31c) not extend to an outer edge of the wound dressing (1, 100),wherein the hydrophobic nonwoven layer (2) and the hydrophilic nonwoven layer (3, 4) comprise plastic fibers made of the same material.

2. Wound dressing (1, 100) according to claim 1, wherein one of the cutting lines (31a) extends to the outer edge of the wound dressing.

3. Wound dressing (1, 100) according to at least one of the preceding claims, wherein the angle between two cutting lines (31a, 31b, 31c) is 100° to 140°, preferably 110° to 130° and in particular about 120°.

4. Wound dressing (1, 100) according to at least one of the preceding claims, wherein the plastic fibers consist of polypropylene.

5. Wound dressing (1, 100) according to at least one of the preceding claims, wherein the wound dressing (1, 100) comprises a distribution layer (8) made of a liquid-permeable and water vapor-permeable material, and the absorption core (7) is enclosed by the distribution layer (8) such that the distribution layer (8) is arranged both between the absorption core (7) and the hydrophobic nonwoven layer (2) and between the absorption core (7) and the hydrophilic nonwoven layer (3, 4).

6. Wound dressing (1, 100) according to at least one of the preceding claims, wherein the absorption core (7) substantially follows the shape of the wound dressing (1, 100) and / or substantially fills the pocket (6).

7. Wound dressing (1 , 100) according to at least one of the preceding claims, wherein the outer edge of the absorption core (7) is at most 10 mm, preferably at most 5 mm and in particular at most 3 mm away from the inner edge of the pocket (6) enclosing the absorption core (7).

8. Wound dressing (1 , 100) according to at least one of the preceding claims, wherein at least 60% of the base area of ​​the pocket (6) enclosing the absorption core (7) is covered by the absorption core (7) in the dry state.

9. Wound dressing (1 , 100) according to at least one of the preceding claims, wherein the hydrophilic nonwoven layer (3, 4) consists of an inner nonwoven layer (3) and an outer nonwoven layer (4), and wherein the inner nonwoven layer (3) consists of plastic fibers and cellulose-based fibers and wherein the outer nonwoven layer (4) consists of plastic fibers.

10. Wound dressing (1 , 100) according to at least one of the preceding claims, wherein the hydrophilic nonwoven layer (3, 4) consists of 60 to 70 wt.% plastic fibers and 30 to 40 wt.% cellulose-based fibers, in particular of about 64 wt.% plastic fibers and about 36 wt.% cellulose-based fibers.

11. Wound dressing (1 , 100) according to at least one of the preceding claims, wherein the hydrophilic nonwoven layer (3, 4) comprises polypropylene fibers and viscose fibers.

12. Wound dressing (1 , 100) according to at least one of the preceding claims, wherein the absorption core (7) has an absorption capacity of 140g / 100cm 2 up to 220g / 100cm 2 exhibits.

13. Wound dressing (1 ,100) according to at least one of the preceding claims, wherein the absorption core (7) comprises 40 wt.% to 50 wt.% SAP particles (9) and 50 wt.% to 60 wt.% absorbent fiber material (10).

14. Wound dressing (100) according to at least one of the preceding claims, wherein the wound dressing comprises an additional wound contact layer (18), and wherein the wound contact layer (18) is in particular a siliconized wound contact layer (18).

15. Wound dressing (100) according to at least one of the preceding claims, wherein the wound dressing comprises an additional wound covering layer (17), and wherein the wound covering layer (17) is in particular waterproof and permeable to water vapor.

16. System for fixing cannulas and tubes to the body of a patient comprising a wound dressing (1) according to one of claims 1 to 13 and a fixation dressing, in particular an adhesive tape.

Images