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WO-2026093093-A1 - WOUND DRESSING HAVING A FIXING REGION FOR A CANNULA OR A TUBE

WO2026093093A1WO 2026093093 A1WO2026093093 A1WO 2026093093A1WO-2026093093-A1

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.

Inventors

  • Streit, Iris

Assignees

  • PAUL HARTMANN AG

Dates

Publication Date
20260507
Application Date
20251022
Priority Date
20241028

Claims (16)

  1. 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 to 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 of the same material.
  2. 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. 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. 4. Wound dressing (1, 100) according to at least one of the preceding claims, wherein the plastic fibers consist of polypropylene.
  5. 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. 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. 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. 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. 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. 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. 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. 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 to 220g/100cm 2 .
  13. 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. 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. 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. 16. System for fixing cannulas and tubes to a patient's body comprising a wound dressing (1) according to any one of claims 1 to 13 and a fixation dressing, in particular an adhesive tape. ```

Description

Ref. 93240826-II-WO-PCT - October 16, 2025 Title: Wound dressing with a fixation area for a cannula or tube Description 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. 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 insertion site, procedures such as tracheotomy or wound drainage may require more absorbent dressings. 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. Wound drainage is usually used after surgical procedures. Tubes are inserted into wounds to drain blood and wound exudate. 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. For entry points on the body where significant fluid drainage 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 tubing is limited, or, if a wider connecting strip is used, the two absorbent cores are positioned further away from the entry point. The entry point is further away. This slows down the absorption of wound exudate by the wound dressing. 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. 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. 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. Furthermore, according to the invention, the hydrophobic nonwoven layer and the hydrophilic nonwoven layer comprise plastic fibers made of the same material. 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 tube or tracheostomy tube, can be inserted. This cut shape allows for adaptation to the diameter of the tube. At the same time, the upward-facing edges conform to the shape of the dressing. The folded areas of the wound dressing adhere to the tube, partially sealing the dressing. This is not possible if the wound dressing only has one, for example circular, opening to accommodate the tube. 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 its 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 the dressing leaking. 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 dressing is not released again, even under pressure. Any two of the cuttin