Method for producing drainage foil, tubular drainage foil and wound care kit

Abstract

The invention provides a method for preparing a double-wall drainage foil with an open drainage space. The method comprises the steps of: i) providing a first web element and a second web element; ii) perforating the first mesh element and the second mesh element wherein in each of the first mesh element and the second mesh element, at least one opening permitting passage of bodily fluids is formed, preferably a plurality of openings permitting passage of bodily fluids is formed; iii) arranging the first web-like element on the second web-like element such that the first web-like element and the second web-like element are arranged substantially parallel; iv) connecting the first web element and the second web element, preferably by ultrasonic welding, in at least one fastening region, in particular in at least one punctiform fastening region, in order to obtain a double-walled drainage foil forming an open drainage space between the first web element and the second web element.

Description

Technical Field

[0001] The present invention relates to a method for preparing a double-walled drainage foil with an open drainage space and a method for preparing a tubular drainage foil. The present invention also relates to a tubular drainage foil, a wound care kit, and the use of the tubular drainage foil or the wound care kit in wound care. The present invention also relates to a method for caring for a wound. Background Art

[0002] Drainage foils are needed in various types of clinical pictures or traumas, in particular during or after abdominal, thoracic or pelvic surgery, for example, if temporary coverage of open wounds and / or drainage of fluids from the wound area is required. Covering an open wound may be necessary, for example, if multiple interventions are required per day to allow quick access to internal organs on the one hand and to reduce the adverse effects of exudate formation in the wound area on the other hand. By temporary coverage, the mortality rate for certain indications can be significantly reduced. In addition, aspiration of body fluids, in particular postoperative drainage, may be necessary to promote wound healing, as fluid accumulation in the wound, such as blood or wound secretions, can disrupt the healing process.

[0003] Basically, from a medical point of view, there are two main requirements for a drainage foil suitable for the described purpose of use. Firstly, good exudate management of the wound area must be achieved, especially when used in an open abdominal, thoracic or pelvic cavity, i.e. body fluids must be aspirated over the entire wound area. Furthermore, friction between the wound or surrounding organs and the drainage foil should be reduced, while the wound should be adequately protected from environmental influences. Furthermore, it must be ensured that no contaminants enter the open wound or the patient through the drainage foil.

[0004] EP 0261167 B1 describes a liquid permeable wound cover which is provided for direct contact with the wound base and has a hydrophobic layer to prevent adhesion of the wound cover to the wound area and any contamination of the wound thereby. However, satisfactory exudate management in the wound area cannot be achieved using the wound cover described in this application.

[0005] In order to improve the exudate management in the wound area, US Pat. No. 7,381,859 B2 proposes a wound cover in which a foam-like layer capable of absorbing exudate is accommodated between two liquid-permeable foil-like mesh elements, which can be in the form of plastic films. However, in the case of the wound cover known from this application, it has proven problematic that satisfactory exudate suction cannot be achieved in the edge regions of the wound cover, resulting in complications in wound care in these edge regions.

[0006] WO 2007 / 118652 A1 describes a wound spacer grid on which an absorbent secondary dressing can be placed without adhesive and which is provided with a plurality of three-dimensional perforations to form a first smooth surface and a second surface with a roughened grip. When using this known wound cover, the downstream absorbent body can be replaced, thereby ensuring satisfactory wound care for a relatively long period of time. However, even with the wound covering system described in this application, it has proven impossible to achieve satisfactory exudate management over the entire wound area, in particular when the wound is located deep inside the body.

[0007] EP 2424477 B1 describes a double-walled foil for wound covering with an open drainage space. However, with the wound covering known from this application, it has proven problematic that satisfactory wound area coverage cannot be achieved in the case of complex wound areas, in particular wounds located deep within the body. Furthermore, the production of the known wound covering has proven problematic in terms of production efficiency. Summary of the invention

[0008] In view of the above problems in the prior art, the object of the present invention is to provide a drainage foil that allows good exudate management over the entire wound area, especially in the case of complex wounds, such as surgical wounds of internal organs and / or locomotor apparatus, without contaminating the wound. In addition, the object of the present invention is to provide an improved method for preparing a drainage foil.

[0009] Method for preparing double-wall drainage foil According to the present invention, this object is achieved by a method for preparing a double-walled drain foil with an open drain space. The method comprises the following steps: i) providing a first mesh element and a second mesh element; ii) perforating the first mesh element and the second mesh element, wherein at least one opening, preferably a plurality of openings, for allowing body fluid to pass through is formed in each of the first mesh element and the second mesh element; iii) arranging the first mesh element on the second mesh element such that the first mesh element and the second mesh element are arranged substantially in parallel; iv) connecting the first mesh element and the second mesh element in at least one fastening area, in particular at least one point-shaped fastening area, preferably by ultrasonic welding, to obtain a double-walled drainage foil forming an open drainage space between the first mesh element and the second mesh element.

[0010] In the method according to the invention, by connecting the first mesh element and the second mesh element and perforating the mesh element, an open drainage space is formed, which allows capillary action between the individual mesh elements, by which, on the one hand, body fluids, in particular exudates, are prevented from escaping from the drainage space, and on the other hand, body fluids can be distributed over the entire drainage area without the need for additional measures that are absolutely necessary for this purpose, such as providing additional absorbents. In this way, good exudate management can be performed over the entire wound area, because there is also no edge area, which has no capillary function, which would have an adverse effect on exudate management. The method according to the invention makes it possible to prepare a drainage foil, which can be cut into any size or any structure of the wound, even for intracavitary application, and further ensures the required drainage function of the entire wound area. In this case, the method can include a drainage foil configured with a smooth surface to prevent adhesion of tissue and cell wound substrates or in the case of surrounding organs. In addition, the method can include promoting the entry of body fluids into the drainage space of the drainage foil by the mesh element itself formed of a liquid permeable material.

[0011] In this case, the stability of the drainage foil prepared by the method according to the present invention can be improved if at least one opening allowing body fluid to pass through is formed by a channel extending from the first mesh element or the second mesh element in the direction of the other mesh element and leading into the drainage space, and the channel wall of the channel is formed integrally with the corresponding mesh element by perforating the mesh element.

[0012] In the last-described embodiment of the invention, if the openings or channels are arranged such that the cross-sectional area of ​​the openings or channels decreases in a plane extending perpendicularly to the depth direction of the drainage foil starting from one mesh element in the direction of the other mesh element, exudate management can be improved particularly effectively, in particular in order to obtain a capillary effect that promotes the entry of body fluids into the drainage space. In this way, on the one hand, the removal of exudate from the wound area is facilitated and, on the other hand, a backflow from the drainage space into the wound area is prevented.

[0013] In the context of the present invention, it proves to be particularly advantageous in terms of effective exudate management if the diameter of the at least one opening that allows the passage of body fluids is in the range of 100 μm to 2000 μm, preferably in the range of 300 μm to 700 μm, more preferably in the range of 400 μm to 600 μm. It has been found that an excellent capillary action can be achieved by at least one, preferably a plurality of, openings that allow the passage of body fluids and have such a diameter.

[0014] Furthermore, it has been found that particularly good exudate management and particularly good stability of the drain foil can be ensured if the first mesh element and the second mesh element are connected at a plurality of fastening regions, preferably at a plurality of fastening regions formed in a grid arrangement. In terms of the excellent suction capacity of the drain foil, the distance between adjacent fastening regions is preferably 2 mm or more, preferably 3 mm or more, more preferably 5 mm or more in each case. For example, a plurality of fastening regions can be arranged in a rectangular grid. The arrangement of a rectangular grid allows the drain foil to be produced particularly effectively.

[0015] The mesh elements can be connected while ensuring a drainage space with a drainage effect by means of a plurality of point-shaped fastening areas (preferably formed in a grid arrangement). The connection can be achieved by welding, bonding or other types of fixing. However, such a connection should not hinder the removal of exudate, but rather assist it. It has been found that connection by ultrasonic welding not only allows the production of a drainage foil more efficiently than other methods for connecting mesh elements, but also allows the production of a particularly stable drainage foil, the structural integrity of which can be ensured even under mechanical load, such as in the case of intracavitary applications. In particular, it has been found that connection by means of ultrasonic welding allows the production of a particularly durable drainage foil and that a particularly advantageous bonding strength of 0.5 N / 25.4 mm or more can be achieved.

[0016] If the area of ​​each fastening area in a cross section extending vertically to the depth direction is 5mm 2 or smaller, especially 3mm 2 or smaller, particularly preferably 2 mm 2 or less, it has proven advantageous that the distance between the individual fastening areas or the individual grid points of the fastening areas formed in a grid arrangement is 2 mm or more, in particular 3 mm or more, particularly preferably 5 mm or more.

[0017] Whether the fastening is performed by welding, bonding or other types of connection, a material bridge connecting the inner boundary surfaces of the mesh element to each other can be formed in the fastening area. It has been found that this material bridge that promotes the overall structural stability of the drainage foil can be prepared particularly accurately by ultrasonic welding. In order to obtain the desired capillary action in the drainage space, the distance between the inner boundary surfaces of the mesh element is 5mm or less, preferably 4mm or less, and particularly preferably 2mm or less. In this case, if the distance between the inner boundary surfaces of the mesh element is 0.05mm or longer, particularly 0.1mm or longer, and particularly preferably 0.3mm or longer, it can be ensured that the exudate is distributed over the entire area of ​​the drainage foil in the drainage space by capillary action. In order to prepare a high-quality drainage foil, it has been proven to be particularly advantageous if the connection between the first mesh element and the second mesh element is performed by ultrasonic welding, because in this way, the desired distance between the first and second mesh elements, in particular the distance between the inner boundary surface of the drainage space formed by the first mesh element and the inner boundary surface of the drainage space formed by the second mesh element, can be accurately produced in a quality-assured manner. It has been found that producing the drain foil by means of ultrasonic welding allows a higher quality drain foil to be obtained than ensuring the distance between the inner boundary surfaces only by in particular the depth of the funnel-shaped opening, since perforations are usually carried out only with limited precision.

[0018] For use of drainage foil in wound care, if the basis weight of the drainage foil is 30 g / m 2 Up to 90g / m 2 In the range of 40g / m 2 Up to 80g / m 2 , more preferably 50g / m 2 Up to 70g / m 2, then it is proved to be particularly advantageous.The first mesh element and / or the second mesh element may comprise or be a plastic foil, wherein the plastic foil preferably comprises polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid and / or cellulose.This type of plastic foil has the advantage of effectively preventing pathogen (such as bacteria) from penetrating and tissue from adhering and ingrowth.The plastic foil may particularly comprise polyethylene, preferably low-density polyethylene (LDPE).It has been found that the mesh element or the plastic foil comprising polyethylene, particularly low-density polyethylene (LDPE), are particularly advantageous in the preparation and use of drainage foil according to the present invention.The first mesh element and / or the second mesh element may comprise polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid and / or cellulose, preferably polyethylene, more preferably low-density polyethylene (LDPE).The structure of the mesh element may be prepared by a nonwoven production process. In this case, both synthetic and natural (e.g. silk, cotton) fibers, as well as inorganic fibers (e.g. glass ceramics) or metals (silver fibers) can be used to produce the nonwoven or tissue. It is further envisaged within the scope of the invention that the mesh element is equipped with an antibacterial or bacteriostatic layer on one or both sides. For example, the antibacterial or bacteriostatic effect can be achieved by PHMB, silver, chlorhexidine, etc. With regard to avoiding the tendency of the drainage foil produced according to the method of the invention to stick together, at least one mesh element can have a hydrophilic or hydrophobic surface. Furthermore, the use of expandable materials is also envisaged.

[0019] Regarding the use of the drainage foil prepared by the method of the present invention in wound care, if the drainage foil has a tensile strength of 7N / 25.4mm or more, an elongation at break of 40% or more, and a porosity of 75m 3 / m 2 / min or more, and / or a bonding strength of 0.5N / 25.4mm or more, it has been shown to be particularly advantageous. Thus, effective exudate management can be ensured while ensuring the structural integrity of the drain foil. The tensile strength is preferably measured according to DIN EN ISO 527. For example, the tensile strength of the drain foil measured according to DIN EN ISO 527 can reach 7N / 25.4mm or more. The elongation at break is preferably measured according to DIN EN ISO527. For example, the elongation at break of the drain foil measured according to DIN EN ISO 527 can reach 40% or more. The bonding strength is preferably measured according to Edana NWSP 401.0.R0. For example, the bonding strength of the drain foil measured based on Edana NWSP 401.0.R0 or measured according to Edana NWSP401.0R0 is 0.5N / 25.4mm or more. Porosity is a measure of the ratio of the cavity volume of the drain foil to the total volume.

[0020] In the case of a drainage foil prepared by the method according to the invention, at least one opening allowing the passage of body fluids, in particular in a plan view relative to the planar extent of the first mesh element or the second mesh element, can have a circular, annular and / or elliptical shape. Such a shape allows body fluids to effectively enter the open drainage space of the drainage foil from the wound area.

[0021] In the case of a drain foil produced by the method according to the invention, the desired removal of exudate can be achieved while ensuring a satisfactory overall stability of the drain foil if at least one mesh element, preferably two mesh elements, have a plurality of openings which are preferably arranged in a grid shape, in particular in a rectangular grid, wherein the distance between adjacent openings or grid points of the mesh elements is 15 mm or less, preferably 5 mm or less, in particular 3 mm or less. With regard to the desired overall stability of the drain foil produced by the method according to the invention, it has further proved to be particularly advantageous if the mouth of the openings provided in one of the mesh elements is arranged in a projection along the depth direction between the mouths of the openings provided in the other mesh element. In order to prevent the overall structure of the drain foil from collapsing, in particular when negative pressure is applied, it has proved to be particularly advantageous if at least one channel-shaped opening is formed in the mesh element, preferably a plurality of such channels, extending in the depth direction over 50% or more of the total depth of the drain space.

[0022] In order to ensure the desired permeability of the mesh element, the perforation is carried out in such a way that the mouth area of ​​each opening facing the drainage space is 0.1 mm in a plane extending perpendicularly to the depth direction. 2 or larger, especially 0.5mm 2 or larger, particularly preferably 1 mm 2 If the perforation is carried out in such a way that the openings of the drain foil obtained have an opening area of ​​5 mm 2 or smaller, especially 4mm 2 or smaller, particularly preferably 3 mm 2 or smaller, the desired capillary action can be achieved while preventing fluid from flowing back from the drainage space to the wound area.

[0023] As described above, the openings in the channels forming the mesh element are formed by perforations in the mesh element. In this case, in order to obtain a smooth surface that can effectively inhibit tissue or cell adhesion to the wound base or surrounding organs, it proves to be advantageous if the channel wall, at least in a section extending parallel to the depth direction, has an arc-shaped design and merges continuously into the border area of ​​the mesh element.

[0024] Method according to the present invention can include adhesive, particularly glue, adhesive material and / or hook-and-loop fastener, particularly one or more barbs are attached to the drainage foil. This adhesive, adhesive material or hook-and-loop fastener enable the prepared drainage foil to be fixed to other structures, for example, fixed on a body part, a surgical device, an absorbent, a pipe, a line, a stent, an insertion auxiliary device and / or a negative pressure therapy device. For example, the method can include adhesive, adhesive material and / or hook-and-loop fastener being fixed to two relative edges of the drainage foil. Then, this drainage foil can be used for wrapping a structure, for example, selected from an absorbent, a pipe, a line, a stent, an insertion auxiliary device and a negative pressure therapy device, and by connecting the adhesive, adhesive material or the hook-and-loop fastener of two relative edges, the drainage foil is fixed to the structure.

[0025] From a production technology perspective, it has proven to be particularly advantageous if step ii) is carried out before or after step iii) and / or step iv) is carried out after step iii) and before or before step ii).

[0026] The method according to the invention may also comprise forming a three-dimensional structure, preferably a tubular structure, from the drainage foil. The advantage of such three-dimensional structures (e.g. tubular structures) is that they can be used for more complex wounds, such as deep wounds, or deep areas of the body. In particular, such three-dimensional structures, such as tubular structures, can even be used intracavitary, such as in the gastrointestinal tract or fistulas. The drainage foil may be tubular, for example for intracavitary use and / or for accommodating a drainage tube.

[0027] With regard to production technology, it has proven to be particularly advantageous if the three-dimensional structure is formed by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular by UV light or hot air, by using an adhesive and / or by deep drawing, in particular by deep drawing, in which the first mesh element and the second mesh element are connected in step iv).

[0028] Method for preparing tubular drainage foil The object of the present invention is also achieved by a method for preparing a tubular drain foil according to the present invention. The method comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a double-walled drainage foil prepared by the method for preparing a double-walled drainage foil according to the present invention; b) folding the drain foil downward around a folding line, in particular a crease line, and in particular folding it onto itself, so that the drain foil has an overlapping area that can be connected to the connecting line; wherein preferably, the drain foil has a first edge and a second edge extending substantially parallel to the first edge, and the drain foil is folded or creased onto itself along the folding line, in particular the crease line, respectively, so that the drain foil has an overlapping area that can be connected to the connecting line along the first edge and the second edge; c) connecting the drain foils along the overlapping area, wherein a connecting line is formed; d) Obtaining a tubular drainage foil.

[0029] Furthermore, the object of the present invention is achieved by a method for preparing a tubular drain foil according to the present invention. The method comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a double-walled drainage foil prepared by the method for preparing a double-walled drainage foil according to the present invention; b) arranging a first edge of the drain foil on the elastic material such that an overlapping area is formed between the first edge of the drain foil and the elastic material which can be connected to the connecting line; c) connecting the drain foil and the elastic material along an overlapping area between the first edge of the drain foil and the elastic material, wherein a connecting line is formed; d) folding or creasing the drain foil downwards to the elastic material relative to the folding line, in particular the crease line, so that an overlapping area is formed between the second edge of the drain foil (preferably the second edge of the drain foil extending substantially parallel to the first edge) and the elastic material, which can be connected to the connecting line; e) connecting the drain foil and the elastic material along an overlapping area between the second edge of the drain foil and the elastic material, wherein a connecting line is formed; f) Obtaining a tubular drainage foil.

[0030] The object of the present invention is also achieved by a method for preparing a tubular drain foil according to the present invention. The method comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a double-walled drainage foil prepared by the method for preparing a double-walled drainage foil according to the present invention; b) winding the drain foil around a winding shaft in such a way that the drain foil has an overlapping area which is formed by the winding around the winding shaft and can be connected with the connecting line, wherein the drain foil is present in at least two layers; c) connecting the first layer and the second layer of the drain foil present in the at least two layers in the overlapping region, preferably by means of an adhesive or a connecting device; wherein preferably a connecting line is formed; d) Obtaining a tubular drainage foil.

[0031] It has been found that the above-mentioned methods for producing a tubular drain foil according to the present invention are all effective in providing a tubular drain foil that achieves uniform drainage performance even in complex wound areas, such as wounds deep in the body. The following statements relate to all three above-mentioned methods for producing a tubular drain foil according to the present invention. Each of the above-mentioned methods for producing a tubular drain foil may have the following characteristics.

[0032] In terms of production technology, it has proven to be particularly advantageous if the connection is achieved by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular by UV light or hot air, by an adhesive, in particular glue or a hook-and-loop fastener, and / or by a connecting device, in particular a clamp. In particular, the connection of the drain foil along the overlapping area, the connection of the drain foil and the elastic material along the overlapping area between the first edge of the drain foil and the elastic material, the connection of the drain foil and the elastic material along the overlapping area between the second edge of the drain foil and the elastic material, and the connection of the first layer and the second layer of the drain foil of the at least two layers present in the overlapping area can be achieved by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular by UV light or hot air, by an adhesive, in particular glue or a hook-and-loop fastener, and / or by a connecting device, in particular a clamp.

[0033] The connecting device can be, for example, a clamp, a cord, a thread, a seam (e.g., an elastic seam or a seam with an elastic material) or an annular application aid. For example, the drain foil can be wound on a winding shaft, particularly wound on a drainage tube, and then fixed to a tubular drain foil by a connecting device (e.g., a clamp or an annular application aid). Overlapping regions, such as the overlapping regions between the first edge and the second edge of a double-wall drain foil, can be connected by an elastic seam. The elastic seam increases the expansibility of the tubular drain foil.

[0034] The produced tubular drainage foil has particularly advantageous properties for medical use if the connection is achieved by ultrasonic welding, preferably at a speed in the range of 0.1 m / min to 5.0 m / min, a power in the range of 50 W to 500 W and / or a pressure in the range of 5 N to 100 N. Such a connection allows a stable connection line which ensures a high tensile strength even under mechanical load.

[0035] The connection in the method for preparing a tubular drain foil according to the present invention, in particular the connection of the drain foil along the overlapping area, the connection of the drain foil and the elastic material along the overlapping area between the first edge of the drain foil and the elastic material, the connection of the drain foil and the elastic material along the overlapping area between the second edge of the drain foil and the elastic material, and / or the connection of the first layer and the second layer of the drain foil present in at least two layers in the overlapping area, may include arranging the drain foil in an ultrasonic welding device and welding the drain foil, in particular by a welding die, such as an L-shaped welding die, to form a tubular drain foil. It has been found that a tubular drain foil with a corresponding welding die can be prepared efficiently and with high quality.

[0036] Furthermore, it has been found that the properties of the cut edge are particularly suitable for the function of the drain foil if the connection is effected by ultrasonic welding using a cutting wheel having a cutting edge radius of 0.2 mm or less and / or using a cutting wheel having a grinding angle of 15° or less towards the folding line, in particular the crease line, and / or a grinding angle of 75° or less away from the folding line, in particular the crease line. Thus, it is possible to prevent material residues from remaining on the cut edge which could impair the function of the drain foil.

[0037] The connection can be made by welding, in particular ultrasonic welding, for example, by heating the material in the overlapping area, for example the double-walled drain foil and / or the elastic material, by the vibration of the sonotrode caused by the generator, thereby melting it. To produce the weld seam, a cutting wheel can be used, for example a cutting wheel that can weld and cut at the same time. With a cutting wheel that can weld and cut at the same time, the weld seam is produced during the welding process, while excess material is removed. Conventional cutting wheels can also be used to form the connecting line. For example, ultrasonic welding can be carried out using a Nucleus Rotosonic DX1-TC 12 flat ultrasonic welding device, for example with an ultrasonic frequency of about 35 kHz.

[0038] In order to provide a connection line that is as smooth as possible, in particular to prevent any impairment of the function of the tubular drain foil due to a rough connection line, an edge strip of the drain foil arranged on the side of the connection line facing away from the folding line, in particular the crease line, can be removed during or after the connection, in particular by punching. In addition, punching can be used to remove unwanted residual material.

[0039] It has been found that the function of the tubular drain foil is particularly advantageous if the method is carried out in such a way that the width of the connecting line, for example a weld seam, in the circumferential direction of the tubular drain foil is 2 mm or less, preferably 1 mm or less, more preferably 0.5 mm or less. In order to prevent any functional impairment of the product, it is particularly advantageous if a connecting line, in particular a weld seam, which is as narrow as possible is provided. Furthermore, it has proven particularly advantageous to ensure the function of the entire area of ​​the tubular structure if the connecting line has a thickness of 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less, in the radial direction or in the depth direction of the tubular drain foil, in particular in a direction extending perpendicularly to the tube axis. In the way in which the connection is carried out in the method for producing a tubular drain foil according to the invention, the material can melt in the overlapping area, in particular at the connecting line, so that a material bridge is formed, for example if the connection is carried out by welding, in particular ultrasonic welding.

[0040] According to the invention, the method for increasing the stability of the drain foil can comprise attaching a reinforcing element, in particular a reinforcing strip or a reinforcing foil, in the region of the connection line and / or at at least one tube end, preferably by arranging the reinforcing element in the overlapping region before the connection. For example, the reinforcing strip can be provided by double-arranging the drain foil in the region to be reinforced or by fixing a reinforcing material, for example a polyethylene foil, in the region to be reinforced. It has been found that foil, in particular a polyethylene foil, has a particularly advantageous reinforcing effect as a reinforcing element.

[0041] For example, during the connection process, by arranging the reinforcing element in the overlapping area before the connection, the reinforcing element can be additionally co-welded, thereby increasing the tear strength of the drain foil, in particular the tear strength at the connection line. The reinforcing element not only has the advantage of increasing the tear strength of the drain foil, but can also provide other advantages, such as being implemented as an X-ray-contrast-capable reinforcing element. This allows, for example, precise placement of the tubular drain foil on the target structure under the control of X-ray imaging.

[0042] If at least one tube end of the tubular drain foil in the circumferential direction is formed with a reinforcement area, the drain foil is present in the reinforcement area in the form of at least two layers, and the excellent structural integrity of the tubular drain foil can also be further improved. This is particularly conducive to the application of auxiliary tools (such as absorbent, pipe, line, support or insertion auxiliary device) inserted into the tubular drain foil, such as in surgical procedures or in the preparation process of wound care kits. The tube opening is further stabilized by the reinforcement area so that any required auxiliary tool can be inserted into the tubular drain foil without the risk of tearing the drain foil. With regard to preparation technology, if a part of the tubular drain foil is folded downwards at the tube end, particularly the edge area of ​​the tubular drain foil, is formed to strengthen the area, it has been proved to be advantageous, wherein the downward folding is particularly carried out in such a way that the tubular element forming the inner boundary surface of the tubular drain foil forms the outer boundary surface of the tubular drain foil in the reinforcement area. The method can also include fixing the folded-down portion of the tubular drain foil, such as point-shaped fixing, particularly fixing by welding, thermal bonding, adhesive and / or connecting device. “Folded down” refers to any shape, arrangement, bend, wrap or fold of the drain foil, in which an overlap area can be achieved, in particular an overlap area which can be connected to a connecting line, and / or a reinforced area with the drain foil.

[0043] The method for preparing a tubular drain foil according to the invention can include rolling up at least a portion of the tubular drain foil along the longitudinal tube axis starting from the tube opening at the tube end, in particular rolling up along the longitudinal tube axis starting from the inner boundary surface in the direction of the outer boundary surface. The tubular drain foil can be partially rolled up or completely rolled up. It has been found that the application of the rolled tubular drain foil is simplified compared to a non-rolled drain foil, because the user can effortlessly roll the tubular drain foil onto a structure, such as a drainage tube or a probe, in order to wrap them with the tubular drain foil.

[0044] Even with regard to the smooth surface of the outer side of the tubular drain foil, it has proven to be advantageous if, after the connection, the side of the connection line facing the folding line, in particular the crease line, is completely turned outwards by turning the tubular drain foil over. The smooth surface of the outer side of the connection line ensures a high functionality of the tubular drain foil in the area of ​​the connection line.

[0045] In order to achieve a particularly good drainage effect with the prepared tubular drain foil, the drain foil provided in step a) of the method for preparing a tubular drain foil according to the present invention can be a drain foil prepared by the method for preparing a double-walled drain foil according to the present invention. The structure of the prepared drain foil prevents the collapse of the open drain space between the two layers with the aid of the fastening area. Therefore, the suction distribution is ensured over the entire area up to the edge area of ​​the tubular drain foil, and the drain foil effectively removes exudate.

[0046] Tubular drainage foil According to the present invention, the purpose of the present invention is also achieved by a tubular drainage foil, the tubular drainage foil having a first tubular element forming an outer boundary surface and a second tubular element forming an inner boundary surface away from the outer boundary surface, and the second tubular element is connected to the first tubular element by at least one fastening area, wherein the first tubular element and the second tubular element each include at least one opening allowing body fluid to pass through, and an open drainage space is formed between the outer boundary surface and the inner boundary surface. In the tubular drainage foil according to the present invention, a capillary action is achieved between the two tubular elements by the open drainage space, and the capillary action allows body fluid, especially exudate, to flow out or be sucked out on the entire tubular structure. The tubular drainage foil according to the present invention can ensure effective exudate management for more complex wounds, such as wounds located deep inside the body, especially in the case of intracavitary application. The advantage of the tubular drainage foil according to the present invention is that it can not only be used on the wound surface, but also can be arranged between organ structures to effectively suck out body fluid, such as exudate.

[0047] The first tubular element and / or the second tubular element may include or be plastic foil, wherein the plastic foil preferably includes polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid and / or cellulose. This type of plastic foil has the advantage of effectively preventing pathogen (such as bacteria) from penetrating and tissue from adhering and ingrowth. The plastic foil may include polyethylene, preferably low-density polyethylene (LDPE) in particular. It has been found that tubular element or the plastic foil comprising polyethylene, particularly low-density polyethylene (LDPE), are particularly advantageous for the preparation and use of tubular drainage foil according to the present invention. The first tubular element and / or the second tubular element may include polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid and / or cellulose, preferably polyethylene, more preferably low-density polyethylene (LDPE). Within the scope of the present invention, it is also contemplated that tubular element is equipped with antibacterial material or antibacterial layer on one or both sides. Antibacterial or antibacterial action can be achieved by PHMB, silver, chlorhexidine etc. In order to avoid the tendency of the drain foils produced by the method of the invention to stick together, at least one of the tubular elements may have a hydrophilic or hydrophobic surface. Furthermore, the use of swellable materials is also envisaged.

[0048] With regard to the structural integrity of the tubular drain foil, it proves to be advantageous if the first tubular element and the second tubular element are connected at a plurality of fastening regions, preferably at a plurality of fastening regions formed in a grid arrangement. In order to ensure a good capillary action of the open drain space formed between the first tubular element and the second tubular element, the distance between adjacent fastening regions is preferably 2 mm or more, preferably 3 mm or more, more preferably 5 mm or more. For example, the plurality of fastening regions may be arranged in a rectangular grid.

[0049] Furthermore, for effective capillary action, if the area of ​​the cross section of each fastening area extending perpendicularly to the radial direction or the depth direction is 5 mm 2 or smaller, especially 3mm 2 or smaller, particularly preferably 2 mm 2 or less has proven to be advantageous. The depth direction is in particular a direction extending perpendicularly to the boundary surface. The radial direction is in particular extending perpendicularly to the longitudinal tube axis.

[0050] Whether the fastening of the fastening area is carried out by welding, such as ultrasonic welding, adhesive bonding or other types of connection, a material bridge connecting the tubular elements to each other can be formed in the fastening area. It has been found that this material bridge that promotes the overall structural stability of the tubular drain foil can be prepared particularly accurately by ultrasonic welding. In order to obtain the required capillary action in the drainage space, the distance between the inner boundary surfaces of the tubular elements defining the open drainage space is 5mm or less, preferably 4mm or less, and particularly preferably 2mm or less. In this case, if the distance between the inner boundary surfaces of the tubular elements defining the drainage space is 0.05mm or more, particularly 0.1mm or more, particularly preferably 0.3mm or more, it can be ensured that the exudate distribution over the entire area of ​​the tubular drain foil is utilized by the capillary action in the drainage space. The tubular drain foil has such a distance between the inner boundary surfaces of the tubular elements defining the drainage space, preferably at least 50% of the drainage foil area, preferably at least 70% of the drainage foil area.

[0051] The tubular drain foil according to the invention may have a connection line, preferably a weld seam, which connects the first tubular element and the second tubular element, and / or the first tubular element and / or the second tubular element and the elastic material. The connection line may be provided, for example, by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular by UV light or hot air, by an adhesive, in particular glue or a hook-and-loop fastener, and / or by a connecting device, in particular a clamp. For example, the connection line is produced by arranging a first edge of the drain foil on a second edge of the drain foil and connecting the latter to each other, for example by ultrasonic welding, so that a connection line (e.g. a weld seam) is produced between the first edge and the second edge.

[0052] It has been found that it is particularly advantageous for the function of the tubular drain foil if the width of the connecting line (e.g., weld) in the circumferential direction of the tubular drain foil is 2 mm or less, preferably 1 mm or less, more preferably 0.5 mm or less. Furthermore, it has proven to be particularly advantageous for ensuring the function of the entire area of ​​the tubular structure if the thickness of the connecting line in the radial direction or depth direction of the tubular drain foil is 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less.

[0053] For use of tubular drainage foil in wound care, if the basis weight of the drainage foil is 30 g / m 2 Up to 90g / m 2 In the range of 40g / m 2 Up to 80g / m 2 , more preferably 50g / m 2 Up to 70g / m 2It has proven to be particularly advantageous if the drain foil has a tensile strength of 7 N / 25.4 mm or more, an elongation at break of 40% or more, a porosity of 75 m 3 / m 2 / min or more and / or a bonding strength of 0.5N / 25.4mm or more, effective exudate management can be ensured while ensuring the structural integrity of the drain foil. The tensile strength is preferably measured according to DIN EN ISO 527. For example, the tensile strength of the tubular drain foil is 7N / 25.4mm or more, measured according to DIN EN ISO 527. The elongation at break is preferably measured according to DIN EN ISO 527. For example, the elongation at break of the tubular drain foil is 40% or more, measured according to DIN EN ISO 527. The bonding strength is preferably measured according to Edana NWSP401.0.R0. For example, the bonding strength of the tubular drain foil measured based on Edana NWSP 401.0.R0 or measured according to Edana NWSP401.0R0 is 0.5N / 25.4mm or more. Porosity is a measure of the ratio of the cavity volume to the total volume of the drain foil.

[0054] The tubular drainage foil according to the invention may have a tube opening at at least one tube end. For example, a tubular drainage foil may be provided which has a tube opening at one tube end and has material, such as a mesh element connected by a connecting line and / or a tubular element forming the tube end, continuously at the other end of the tubular structure. Alternatively, a tubular drainage foil may be provided which has a tube opening at both tube ends. For certain applications, such as for the drainage of deep wounds in the body, it proves to be particularly advantageous if the tubular drainage foil has a tube opening at one tube end and no tube opening at the other tube end.

[0055] According to the invention, the tubular drain foil can have a reinforcing element, in particular a reinforcing strip or a reinforcing foil, at at least one tube end and / or along the connecting line. For example, the reinforcing strip can be an area where the material (for example a double-walled drain foil, in particular a drain foil prepared according to the method of the invention) is present in two layers, and / or an area where the reinforcing material (for example a polyethylene foil) is fixed to the first tubular element and / or the second tubular element. It has been found that foil, in particular a polyethylene foil, has a particularly advantageous reinforcing effect as a reinforcing element. If the connecting line and / or at least one tube opening has a reinforcing element, the structural integrity of the tubular drain foil is particularly promoted.

[0056] If the tubular drain foil has a reinforcement area at at least one tube end, and the drain foil is present therein with at least two layers, the excellent structural integrity of the tubular drain foil according to the present invention is further improved. This is particularly advantageous for the application of inserting auxiliary tools (such as absorbers, tubes, wires, stents or insertion aids) into the tubular drain foil. The reinforcement area further stabilizes the tube opening, allowing any required auxiliary tools to be inserted into the tubular drain foil without the risk of tearing the drain foil. In terms of preparation technology, it is advantageous if the reinforcement area is formed in the form of a two-layer edge, which is formed by folding a part of the tubular drain foil downward at the tube end, wherein the folding downward is particularly performed in such a way that the second tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drain foil in the reinforcement area, particularly the outer boundary surface of the reinforcement area of ​​the tubular drain foil. The edge folded downward can be fixed in a point-like manner.

[0057] According to the present invention, the outer boundary surface of the tubular drainage foil, the inner boundary surface of the tubular drainage foil and / or the inner cavity of the tubular drainage foil formed by the inner boundary surface of the tubular drainage foil can include a sliding aid and / or an insertion auxiliary device. By this sliding aid and / or insertion auxiliary device, the convenience of use and the simplicity of application can be further improved. For example, the outer boundary surface and / or the inner boundary surface of the tubular drainage foil can be configured with a low friction surface, particularly an anti-stick coating and / or a micro-rough surface, so as to facilitate insertion. In particular, the outer boundary surface and / or the inner boundary surface of the tubular drainage foil can include or be coated with silicone, polytetrafluoroethylene (PTFE) and / or moisture, so as to facilitate insertion. The sliding aid that significantly improves sliding ability is, for example, a water-based lubricant, a glyceryl lubricant, a polymer gel, particularly an antiallergic polymer gel, an endoscope lubricant, particularly an endoscope sliding gel and / or an aqueous solution, particularly a sodium chloride solution. If the material used as a sliding aid can be dissolved without residue, particularly in an aqueous solution, to prevent the material from remaining on the product, it is particularly advantageous. The insertion aid comprising fabric and / or plastic is particularly suitable as the insertion aid. The insertion aid may comprise a low friction surface, particularly an anti-stick coating and / or a micro-rough surface. For example, the insertion aid may comprise fabric and / or plastic, wherein the fabric or plastic comprises or is coated with silicone, polytetrafluoroethylene (PTFE) and / or moisture. The insertion aid may be a tubular insertion aid arranged in the tubular drainage foil inner cavity, for example a tubular insertion aid with a tube opening or two tube openings. In particular, the insertion aid may have a tube opening at one tube end and a closed tube end at the other tube end. The tubular insertion aid may be provided with a predetermined breaking point at its closed tube end. The tubular drainage foil may be provided in a single-chamber or multi-chamber manner.

[0058] Therefore, the tubular drainage foil is particularly advantageous for a variety of applications, such as intracavitary applications, gynecological or urological applications, and thoracic, visceral and / or hip surgery applications. The length of the tubular drainage foil can be in the range of 0.5 cm to 40 cm, preferably 2 cm to 30 cm, and more preferably 5 cm to 20 cm. However, longer or shorter tubular drainage foils can also be provided. For example, a tubular drainage foil with a length of 10 cm or longer, or 20 cm or longer, is suitable for gastrointestinal tract intraluminal applications and fistulas. In the case of application in various wound cavities, the length can be adapted to the wound cavity; for example, a tubular drainage foil with a length of 10 cm or shorter can be provided for the wound cavity, and a tubular drainage foil with a length of 5 cm or shorter (e.g., 2 cm or shorter) can also be provided for smaller wound cavities.

[0059] In addition, if the outer diameter of the tubular drainage foil is in the range of 1mm to 60mm, preferably 2mm to 50mm, and more preferably 4mm to 30mm, the tubular drainage foil is particularly suitable for a variety of applications in terms of effective wound management. However, a tubular drainage foil with a larger or smaller outer diameter can also be provided. For applications in narrow wounds and / or deep areas of the body, such as in applications in the pancreas, gynecology or urology, and in the case of intracavitary applications, a tubular drainage foil with a smaller outer diameter is particularly suitable, such as a tubular drainage foil with an outer diameter of 5mm or less, particularly 4mm or less. The tubular drainage foil according to the present invention has the advantage that, even when the outer diameter of the drainage foil is small, uniform drainage performance can be guaranteed and tissue blocking of the drainage outlet is prevented. Therefore, even when the outer diameter is very small, the tubular drainage foil can also actively drain liquid. In the case of invasive surgery, such as on the hip joint, especially when the wound area is large. A tubular drainage foil with a larger outer diameter can also be used, such as an outer diameter of 6mm or more. Depending on the accessibility and size of the wound area, a tubular drainage foil may be provided with a suitable length and a suitable outer diameter.

[0060] Wound Care Kit The object of the present invention is also achieved by a wound care kit according to the present invention, the wound care kit comprising a tubular drainage foil prepared according to the method for preparing a tubular drainage foil according to the present invention or a tubular drainage foil prepared according to the present invention, and at least one other component, for example, selected from an absorber, a tube, a line, a stent and an insertion aid. With regard to the particularly simple handling of the wound care kit, it proves to be advantageous if at least a portion of at least one other component is arranged in the inner cavity of the tubular drainage foil consisting of the inner boundary surface. For particularly effective negative pressure therapy, the wound care kit can include, for example, a tubular drainage foil and a drainage tube, wherein a portion of the drainage tube is arranged in the inner cavity of the tubular drainage foil. The drainage tube can be connected to a negative pressure source. The at least one other component can be partially or completely arranged in the tubular drainage foil.

[0061] In a particularly preferred embodiment of the invention, the absorbent is a sponge, a foam, in particular a polyurethane or polyvinyl alcohol foam, or a gauze. It has been found that a wound care kit with such an absorbent can effectively draw liquids from a body area, in particular a wound area. If the absorbent is arranged in the inner cavity of a tubular drainage foil consisting of an inner boundary surface, tissue can be prevented from adhering to the absorbent. As a result, liquids can be effectively and non-invasively drawn from the wound area.

[0062] In the sense of a particularly advantageous suction efficiency, it has proven to be advantageous if the tube included in the wound care kit is a drainage tube. The drainage tube can be single-lumen or multi-lumen. A wound care kit with a drainage tube allows continuous suction of liquid from the wound area and also allows suction of large quantities of liquid. Since the tubular drainage foil can be provided in any size, in particular any outer diameter, any length and any shape, the wound care kit can even be equipped with a tube and / or used with a tube having a complex geometry, for example a multi-lumen geometry.

[0063] The length of the wound care kit according to the invention may be in the range of 0.5 cm to 250 cm, preferably 10 cm to 200 cm. The length of the wound care kit may be optimized for the respective application; for example, a wound care kit having a length of at least 10 cm or at least 20 cm may be provided for application within the gastrointestinal cavity or within a fistula. For application in a wound cavity, the length may be adapted to the respective wound cavity; for example, the length of the wound care kit may be less than 10 cm, less than 5 cm or less than 2 cm, depending on the size or depth of the wound cavity.

[0064] Medical uses and methods for wound care The present invention also relates to the application of the tubular drainage foil and wound care kit according to the present invention in wound care, for example, for draining wounds and / or according to the method for wound care of the present invention. The tubular drainage foil or wound care kit is preferably used for drainage, for example, during and / or after surgery. The tubular drainage foil according to the present invention or the wound care kit according to the present invention is preferably used, for example, to discharge body fluids from the wound area during surgery. The tubular drainage foil according to the present invention and the wound care kit according to the present invention allow liquid to be sucked out from the wound simply and reliably. The tubular drainage foil according to the present invention and the wound care kit according to the present invention can be used, for example, in cavities, such as gastrointestinal tract, gynecology and urology, surgical operations, such as chest, visceral and hip operations, and negative pressure therapy. The tubular drainage foil or wound care kit can be used for drainage, particularly within the scope of surgical operations. Therefore, blood, wound secretions and / or tissue fluids usually accumulate during surgical interventions, and their accumulation in the wound cavity can be prevented by applying drainage. In this way, the healing process can be significantly promoted.

[0065] The tubular drainage foil or wound care kit according to the present invention can be particularly advantageously combined with negative pressure therapy for wound care. In this case, the tubular drainage foil or wound care kit according to the present invention is used as a direct interface between a wound (particularly a wound base) and a wound filler or exudate removal area (e.g., a drainage tube). Particularly advantageously, the tubular drainage foil or wound care kit according to the present invention can be used for wounds of internal organs. In this case, the tubular drainage foil is applied to the wound, wherein the tubular drainage foil provides a drainage function and a very smooth surface to prevent adhesion or friction of tissue and foil. The tubular drainage foil or wound care kit according to the present invention can be anatomically preformed, but can also be configured to be customized according to specific circumstances. When used in combination with negative pressure therapy, a filling medium such as gauze or foam can be filled into the tubular drainage foil or wound care kit according to the present invention, and / or a drainage tube can be inserted. The tube for discharging exudate or for wound drainage can be drawn from the inside of the body (e.g., the abdominal cavity) and connected to a negative pressure source, which can be guaranteed by a pump or by central home care in a hospital. By utilizing a negative pressure source, exudate can be removed from the wound by the tubular drainage foil or the wound care kit according to the present invention, thereby achieving good exudate management.

[0066] In case of medical use of the tubular drainage foil or wound care kit according to the invention, the following advantages may result: - The openings which allow the passage of body fluids help to remove exudate and prevent the exudate from flowing back into the wound space (capillary action).

[0067] - Tubular drainage foil prevents tissue or cell adhesion to the wound base or surrounding organs.

[0068] - The tubular drainage foil or wound care kit can be customized to any size or structure of the wound area without compromising the drainage function, thus also allowing the care of complex wounds.

[0069] The invention further relates to a method for caring for a wound, wherein a tubular drainage foil according to the invention or a wound care kit according to the invention is brought into contact with a patient's wound. In particular, the tubular drainage foil or the wound care kit is brought into contact with the patient's wound so that body fluids, such as exudate or blood, can flow out of the wound into the tubular drainage foil or into the wound care kit. The tubular drainage foil according to the invention and the wound care kit according to the invention allow body fluids, in particular blood or wound fluid, to flow out or be sucked out of the wound effectively. The method for wound care according to the invention has the advantage of effectively sucking out body fluids and preventing bacteria or other pathogens from penetrating into the wound area.

[0070] The method for wound care can be a method for draining wounds. The method for wound care can be used for all fields of medicine and all areas of the body, such as intracavitary application, gynecological or urological application, and the application in thoracic surgery, visceral and / or hip surgery. As mentioned above, the length and / or outer diameter of tubular drainage foil or wound care kit can adapt to the requirements of the corresponding wound area, such as small outer diameter can be used for the intracavitary application of the gastrointestinal tract. The method for wound care according to the present invention can be used for any area of ​​the body and any wound, because the shape of tubular drainage or wound care kit can be adjusted according to the shape of the corresponding area of ​​the body, the wound or the required drainage area. According to the present invention, tubular drainage foil or wound care kit is provided, which has any shape, any size and any outer diameter, and is applicable to any wound or any medical use. For example, the tubular drainage foil can be circular or cylindrical, such as for the application in the gastrointestinal tract or fistula, or is configured as a flat tubular drainage foil, particularly a flat drainage foil. In addition, the tubular drainage foil can be provided in any size.

[0071] The method for caring for wounds according to the invention has the following advantages over other methods for caring for wounds, for example, the tubular drainage foil adheres less to the tissue than absorbents such as polyurethane foam, thereby reducing the risk of damage and bleeding. Therefore, the method according to the invention is suitable even for sensitive body parts, such as blood vessels or areas of pre-damaged tissue, and for patients with increased risk of bleeding. In addition, it can be used in a multifunctional manner, since tubular drainage foils or wound care kits can be used, which correspond to the anatomical requirements and drainage requirements of the wound area. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] The invention is explained below with reference to the accompanying drawings, wherein all details which are essential to the invention and which are not highlighted in more detail in the description are explicitly mentioned. As shown in the drawings: Figure 1 is a schematic diagram of an ultrasonic welding device; Figure 2 is a schematic diagram of a stamping device; Figure 3 is a schematic diagram of a device for flipping a tubular drainage foil; Figure 4 is a schematic diagram of a creasing technique or a winding technique for folding or creasing a drain foil downwardly around a folding line, in particular a crease line, or winding the drain foil around a winding shaft so that the drain foil has an overlapping area that can be connected to a connecting line; Figure 5 is a schematic diagram of a self-adhesive drainage foil, which can be used as a tubular drainage foil by winding or folding; Figure 6 is a schematic diagram of a self-adhesive drainage foil, which can be used as a tubular drainage foil by wrapping or folding (e.g. around a drainage tube); Figure 7 It is a schematic diagram of the connection lines, especially the welds; Figure 8 is a schematic diagram of attaching a reinforcing element to a drainage foil; Fig. 9 is a schematic diagram of an insertion aid; Fig.10 is a schematic diagram of a rolled tubular drainage foil and a rolled tubular drainage foil; Fig.11 is a schematic diagram of a tubular drainage foil having an elastic material; Fig.12 is a schematic diagram of a tubular drainage foil whose edges are strengthened by folding down; Fig.13 is a schematic diagram of a tubular drainage foil; Fig.14 is a schematic diagram of a tubular drainage foil having a tube; Fig.15 is a schematic diagram of a tubular drainage foil having a tube and an absorber; Fig.16 is a schematic diagram of a wound tubular drainage foil having a tube. DETAILED DESCRIPTION

[0073] Figure 1 The ultrasonic welding device shown can be used to prepare the drain foil 3 according to the present invention, in particular the tubular drain foil 3a. For example, the ultrasonic welding device can be used to prepare the tubular drain foil 3a by simultaneous stamping and welding; here, due to ultrasonic welding, the overlapping materials are connected in the overlapping area to form a connecting line 11, while the edge strip of residual material is removed. The double-walled drain foil 3b is inserted into the base 4 in a folded-down manner and fixed. The ultrasonic welding mold 1, such as an L-shaped ultrasonic welding mold 1, is located in a support frame (bracket) 2 above the base 4. The generator induces the required voltage into the welding mold 1. The welding mold 1 moves downward and welds the contour of the tubular drain foil 3a. After the welding operation is completed, the support frame 2 moves back to the starting position. The tubular drain foil 3a can then be removed. The left figure shows a plan view of the ultrasonic welding device, and the right figure shows a side view.

[0074] Figure 2The punching device shown can be used to produce the drain foil 3 according to the invention. The provided double-walled drain foil 3b is inserted into the lower die half of the punching tool in a folded-down manner on one side. An integrated heated cutting tool is provided in the lower die half of the punching tool. The punching operation is started by moving the upper die half downwards. In the same operation, the hot and sharp cutting element 5 welds the drain foil 3b to the cutting edge and separates it, thereby obtaining a tubular drain foil 3a with a weld seam 6. The foil residue 7 is removed by punching. The mold is then opened by moving the upper die half upwards and the tubular drain foil 3a can be removed.

[0075] Figure 3 The device shown can be used to flip the tubular drainage foil 3a. First, the tubular drainage foil 3a is prepared according to one of the above methods, for example, by welding the overlapping area to form the connecting line 11. For use in the wound area, in particular to prevent tissue adhesion, it has been proven to be particularly advantageous if the connecting line 11 has a smooth surface on the outside of the tubular drainage foil 3a. In order to produce a smooth surface on the weld 6, the tubular drainage foil 3a can be flipped from the inside to the outside so that one side 10 of the connecting line 11 (previously away from the folding line, especially the crease line) is located on one side 12 of the connecting line 11 (facing the folding line, especially the crease line) after flipping. The tubular drainage foil 3a can be pulled onto the upper movable plunger 8 of the device shown in order to tip over or flip. In addition, the sleeve 9 moves on the movable plunger 8 and rotates the tubular drainage foil 3a with the help of a rigid counter plunger 13.

[0076] Figure 4 The folding-over or winding technique shown can be used to place the drain foil 3 flat on the winding shaft 27, for example on the end of the tube 16, or fold it on the tube 16. For example, the drain foil 3 can be wound around the winding shaft 27 so that the drain foil 3 has an overlapping area, which is formed by the winding around the winding shaft 27 and can be connected to the connecting line 11, and in which the drain foil 3 is present in at least two layers. Then, the overlapping area can be connected or fixed to obtain a tubular drain foil 3a, for example by an adhesive 14 or a connecting device, such as a clamp, a seam or a ring-shaped application aid.

[0077] Figure 5The self-adhesive drainage foil 3 shown can be fixed to any desired structure, for example to a body part, a surgical device, an absorbent, a tube, a line, a stent, an insertion aid 22 and / or a negative pressure therapy device. An adhesive 14 attached to the drainage foil 3, in particular glue, an adhesive material and / or a hook-and-loop fastener 15, such as one or more barbs, can be used to wrap or fold the drainage foil 3 around other structures and then fix it to the structure or around the structure in a particularly tubular manner. This drainage foil 3 can be used as a self-adhesive tubular drainage foil 3a, which has the advantage that it can be adapted to structural requirements in situ, for example to the size of the wound cavity. During the process of winding or folding the drainage foil 3 around the corresponding structure (for example around the drainage tube), the adhesive or adhesive part of the drainage foil 3 is fixed to another part of the drainage foil 3. If the drainage foil 3 fixed to the structure in this way must withstand particularly high mechanical loads, the drainage foil 3 can be additionally fixed by a seam if necessary. According to the invention, the drain foil 3 may be provided with one or more adhesive parts, in particular adhesive 14 may be attached to one part, or adhesive 14, such as two complementary components of a hook and loop fastener 15a, 15b, may be attached to two or more parts and thus to each other.

[0078] Figure 6 A self-adhesive drainage foil 3 is shown with an adhesive 14 which can be wrapped around a tube 16 or a probe and can thus be used as a tubular drainage foil 3a.

[0079] Figure 7 A schematic diagram of a connecting line 11, in particular a weld seam 6, between a first element 17 and a second element 18, for example a first mesh element and a second mesh element or a first tubular element and a second tubular element is shown. Detail A shows that the foil thickness is tapered by the connection, in particular by the welding operation. The foil is compressed in the region of the connecting line 11, in particular the weld seam 6. By compressing the double-walled drain foil 3b in the region of the connecting line 11 and the cutting wheel corner, a geometrically relevant angle α is generated between the ridge of the connecting line 11 and the outer boundary surface 28 of the tubular drain foil 3a.

[0080] The connection lines 11 of the perforated drain foil 3, such as the weld seams 6, can represent critical points in the product in terms of foil stability. In order to provide the tubular drain foil 3a according to the invention with open drain spaces 20 having particularly excellent strength properties, in particular in order to increase the strength of the connection lines 11, such as the weld seams 6, they can be reinforced with additional material. Figure 8A schematic diagram is shown of attaching a reinforcing element 29 to a drain foil 3 comprising a first element 17 and a second element 18, for example by welding to a cutting wheel 19. In particular, a non-perforated polyethylene foil can be used as additional material or reinforcing element 29. In order to be able to weld an additional foil layer, for example an additional, in particular non-perforated polyethylene foil, to the drain foil 3 particularly effectively, the foil layer can be made of polyethylene. Due to the additionally welded, in particular non-perforated polyethylene foil, for example during the welding process, more material flows into the holes of the drain foil 3 in the region of the connection line 11 and stabilizes the holes, thereby achieving excellent strength. Such a reinforcing element 29, for example a polyethylene foil, significantly increases the tensile load of the weld 6. In order to attach the reinforcing element 29, the reinforcing element, for example an additional polyethylene foil, can be placed on the drain foil 3 and then folded down. During the connection process, for example by ultrasonic welding, the reinforcing element 29 is connected to the drain foil 3 in the overlapping area, thereby producing a connection line 11, in particular a stable weld 6. The residual material 21 of the reinforcing element 29, for example residual polyethylene foil, is then removed in the region of the connecting line 11, in particular in the region of the weld 6, for example manually or mechanically. The reinforcing element 29, for example polyethylene foil, can be provided only in the connecting line 11, in particular in the weld 6.

[0081] Fig. 9 The tubular drain foil 3a shown with the insertion aid 22 simplifies the application of the drain foil 3. Various materials, such as textiles or plastics, which have low friction relative to plastics, such as micro-rough textiles, can be used as the insertion aid 22. The insertion aid 22 can be applied both to the tube 16 ( Fig. 9 The left side in the figure), can also be directly integrated into the drainage foil 3a, or included in the inner cavity of the tubular drainage foil 3a ( Fig. 9 For example, the insertion aid 22 can be placed on a tube, such as a drainage tube or a probe ( Fig. 9 The tubular drain foil 3a can have closed tube ends, for example if the tube 16 is to be covered with a tubular drain foil 3b. It has been found that for certain applications it is advantageous if such a closed tube end has a predetermined breaking point 23. By means of the predetermined breaking point 23, the insertion aid 22 can be removed by applying a force. The insertion aid 22 can also be tubular with two open tube ends (in Fig. 9In terms of production technology, it has been found to be particularly advantageous if the insertion aid 22 is already incorporated into the tubular drainage foil 3a during the production of the tubular drainage foil 3a. For simple handling of the insertion aid 22, it has proven to be advantageous if the insertion aid 22 is longer than the tubular drainage foil 3a so that it protrudes over the tube end of the tubular drainage foil 3a and can be gripped. After the tubular drainage foil 3a or the tube covered by the tubular drainage foil 3b has been inserted into the wound area, the insertion aid 22 can be removed by simply pulling it out.

[0082] Fig.10 It is shown that the tubular drain foil 3a is rolled up to obtain the rolled tubular drain foil 3a. The advantage of the partially or completely rolled tubular drain foil 3a is that it can be packaged efficiently, in particular in an environmentally friendly manner by saving material. In addition, they have the advantage that the user can effortlessly roll the tubular drain foil 3a onto a structure, such as a tube 16, in particular a drainage tube or a probe, in order to wrap them with the tubular drain foil 3a. In order to roll up the tubular drain foil 3a, part or all of the tubular drain foil 3b of the tubular drain foil 3a can be rolled up along the longitudinal tube axis 30 from the tube opening at the tube end. In particular, the tubular drain foil 3a can be rolled up along the longitudinal tube axis 30 in the direction of the outer boundary surface 28 starting from the inner boundary surface to roll up part or all of the tubular drain foil 3a.

[0083] Fig.11 A tubular drain foil 3a with elastic material is shown. The tubular drain foil 3a may have, for example, an elastic foil 24 or an elastic seam 25, in particular a seam made of an elastic material. By integrating an elastic material into the tubular drain foil 3a, the elasticity of the tubular drain foil 3a may be increased, in particular if the double-walled drain foil 3b used to form the tubular drain foil 3a is composed of a micro-expanded material. The tubular drain foil 3a with elastic material may be formed by connecting the double-walled drain foil 3b with the elastic material along the overlapping region between the drain foil 3b and the elastic material. By integrating an elastic material, such as a strip of elastic foil 24 or an elastic seam 25, the tubular drain foil 3a may be particularly well expanded, thereby facilitating application, such as application to a drainage tube.

[0084] Fig.12A side view of a tubular drain foil 3a with a reinforced edge by folding down is shown. The tubular drain foil 3a can form a reinforced area at one or both tube ends in the circumferential direction. In terms of production technology, it has been proven to be particularly effective if the reinforced area is formed by folding down parts of the tubular drain foil 3a at the tube ends, wherein the folding down is implemented, in particular in a manner that the tubular element forming the inner boundary surface of the tubular drain foil 3a forms the outer boundary surface 28 of the tubular drain foil 3a in the reinforced area. The marked edge area 26 of the tube opening can be folded down to the outside, thereby providing a double wall and thus strengthening the edge of the tubular drain foil 3a. The folded-down edge can be fixed in a point-like manner, for example by a seam. The reinforced edge effectively prevents the tearing of the tubular drain foil 3a.

[0085] Fig.13 Various embodiments of the tubular drain foil 3a according to the invention are shown. In particular, the tubular drain foil 3a can have a tube opening 32 or an open tube end at one tube end and a closed tube end 33 at the other tube end. The tubular drain foil 3a can also have a tube opening 32 at both tube ends. The tubular drain foil 3a can also have a reinforcing element 29, such as a folded-down edge.

[0086] Fig.14 A side view of a tubular drainage foil 3a with a tube 16 is shown, which may be provided together with a wound care kit 34 . Fig.15 A side view of a tubular drainage foil 3 a with a tube 16 and an absorber 35 , which may be provided together as a wound care kit 34 , is shown. Fig.16 A side view of a drain foil 3 is shown, for example a tubular drain foil 3 a , with a tube 16 and a connecting device 36 , for example a ring-shaped application aid or a clamp, which can be provided together as a wound care kit 34 .

[0087] Reference Mark List 1. Welding mold 2 Support frame 3 Drainage foil 3a Tubular drainage foil 3b Double wall drainage foil 4 Base 5 Cutting elements 6. Welding Seam 7 Foil Residue 8 Plunger 9 sleeve 10 The connecting line is away from the folding line, especially the side of the crease line 11 Connection wires 12 The connecting line faces the folding line, especially the side of the crease line 13 Reverse plunger 14 Adhesive 15 hook and loop fasteners 15a, 15b Hook and loop fasteners 16 tubes 17 First Element 18 Second Element 19 cutting wheel 20 drainage space 21 Residual Materials 22 Insertion Assistance Device 23 Predetermined breaking point 24 Elastic Foil 25 elastic seams 26 Edge Area 27 Winding shaft 28 Outer boundary surface of tubular drainage foil 29 Reinforcement elements 30 Tube shaft 31 Inner boundary surface of tubular drainage foil 32 pipe openings 33 Closed pipe end 34 Wound Care Kit 35 Absorber 36 Connecting device

Claims

1. A method for preparing a double-walled drainage foil with an open drainage space, characterized in that: The method comprises the following steps: i) providing a first mesh element and a second mesh element; ii) perforating the first mesh element and the second mesh element, wherein at least one opening, preferably a plurality of openings, for allowing body fluids to pass through is formed in each of the first mesh element and the second mesh element; iii) arranging the first mesh element on the second mesh element so that the first mesh element and the second mesh element are arranged substantially in parallel; iv) connecting the first mesh element and the second mesh element in at least one fastening area, in particular at least one point-shaped fastening area, preferably by ultrasonic welding, to obtain a double-walled drainage foil forming an open drainage space between the first mesh element and the second mesh element.

2. The method according to claim 1, characterized in that The diameter of the at least one opening allowing the body fluid to pass through is in the range of 100 μm to 2000 μm, preferably in the range of 300 μm to 700 μm, and more preferably in the range of 400 μm to 600 μm.

3. The method according to any one of the preceding claims, characterized in that In step iv), the first mesh element and the second mesh element are connected at a plurality of fastening areas, preferably at a plurality of fastening areas formed in a grid arrangement; Therein, preferably the distance between adjacent fastening areas is in each case 2 mm or more, preferably 3 mm or more, more preferably 5 mm or more.

4. The method according to any one of the preceding claims, characterized in that The basis weight of the drain foil is 30 g / m 2 Up to 90g / m 2 In the range of 40g / m 2 Up to 80g / m 2 , more preferably 50g / m 2 Up to 70g / m 2 .

5. The method according to any one of the preceding claims, characterized in that The drain foil has a tensile strength of 7N / 25.4mm or higher, an elongation at break of 40% or higher, and a porosity of 75m 3 / m 2 / min or higher, and / or the bonding strength is 0.5N / 25.4mm or higher.

6. The method according to any one of the preceding claims, characterized in that The at least one opening allowing the passage of body fluids has a circular, annular and / or elliptical shape, in particular in a plan view relative to the planar extent of the first mesh element or the second mesh element.

7. The method according to any one of the preceding claims, characterized in that The method comprises attaching an adhesive, in particular glue, an adhesive material and / or a hook and loop fastener, in particular one or more barbs, to the drain foil.

8. The method according to any one of the preceding claims, characterized in that Step ii) is performed before or after step iii), and / or step iv) is performed after step iii) and before or before step ii).

9. The method according to any one of the preceding claims, characterized in that The method comprises forming a three-dimensional structure, preferably a tubular structure, from the drain foil; Wherein, preferably, the three-dimensional structure is formed by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular by UV or hot air, using an adhesive and / or by deep drawing, in particular deep drawing, connecting the first mesh element and the second mesh element in step iv).

10. The method according to any one of the preceding claims, characterized in that The drainage foil is tubular.

11. A method for preparing a tubular drainage foil, characterized in that: The method comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a drainage foil prepared according to the method of any one of claims 1 to 10; b) folding the drain foil downwards around a folding line, in particular a crease line, and in particular folding it onto itself, so that the drain foil has an overlapping area that can be connected to the connecting line; wherein, preferably, the drain foil has a first edge and a second edge extending substantially parallel to the first edge, and the drain foil is folded or creased onto itself along the folding line or the crease line, respectively, so that the drain foil has an overlapping area that can be connected to the connecting line along the first edge and the second edge; c) connecting the drain foils along the overlapping area, wherein a connecting line is formed; d) Obtaining a tubular drainage foil.

12. A method for preparing a tubular drainage foil, characterized in that: The method comprises the following steps: a) providing a drain foil, preferably a double-walled drain foil with an open drain space, more preferably a drain foil prepared according to any one of claims 1 to 10, and an elastic material; b) arranging the first edge of the drain foil on the elastic material so that an overlapping area is formed between the first edge of the drain foil and the elastic material which can be connected to the connecting line; c) connecting the drain foil and the elastic material along the overlapping area between the first edge of the drain foil and the elastic material, wherein a connecting line is formed; d) folding the drain foil downwards relative to the folding line, in particular the crease line, in particular creasing the elastic material so that an overlapping area connectable to the connecting line is formed between a second edge of the drain foil, preferably a second edge of the drain foil extending substantially parallel to the first edge, and the elastic material; e) connecting the drain foil and the elastic material along an overlapping area between the second edge of the drain foil and the elastic material, wherein a connecting line is formed; f) Obtaining a tubular drainage foil.

13. A method for preparing a tubular drainage foil, characterized in that: The method comprises the following steps: a) providing a drain foil, preferably a double-walled drain foil with an open drain space, more preferably a drain foil prepared according to any one of claims 1 to 10; b) winding the drain foil around a winding shaft so that the drain foil has an overlapping area which is formed by the winding around the winding shaft and can be connected to the connecting line, wherein the drain foil is present in at least two layers; c) connecting the first layer and the second layer of the at least two drain foils present in the overlapping region, preferably by means of an adhesive or a connecting device; wherein preferably a connecting line is formed; d) Obtaining a tubular drainage foil.

14. The method according to any one of claims 11 to 13, characterized in that The connection is achieved by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular by UV light or hot air, by an adhesive, in particular glue or hook and loop fasteners, and / or by a connecting device, in particular a clamp.

15. The method according to any one of claims 11 to 14, characterized in that The connection is achieved by ultrasonic welding, preferably at a speed in the range of 0.1 m / min to 5.0 m / min, a power in the range of 50 W to 500 W and / or a pressure in the range of 5 N to 100 N.

16. The method according to any one of claims 11 to 15, characterized in that The connection comprises: arranging the drain foil in an ultrasonic welding device and welding the drain foil, in particular by means of a welding die, such as an L-shaped welding die, to form a tubular drain foil.

17. The method according to any one of claims 11-12 and 14-16, characterized in that The connection is achieved by ultrasonic welding, which uses a cutting wheel with a cutting edge radius of 0.2 mm or less, and / or a cutting wheel with a grinding angle of 15° or less facing the folding line, especially the crease line, and / or a cutting wheel with a grinding angle of 75° or less away from the folding line, especially the crease line.

18. The method according to any one of claims 11-12 and 14-17, characterized in that During or after the connection, the edge strip of the drain foil arranged on the side of the connection line facing away from the folding line, in particular the crease line, is removed, in particular by punching.

19. The method according to any one of claims 11 to 18, characterized in that The width of the connection line, preferably the weld, along the circumferential direction of the tubular drain foil is 2 mm or less, preferably 1 mm or less, more preferably 0.5 mm or less.

20. The method according to any one of claims 11 to 19, characterized in that The thickness of the connecting line, preferably the weld seam, in the radial direction of the tubular drain foil is 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less.

21. The method according to any one of claims 11 to 20, characterized in that The method comprises attaching a reinforcement element, in particular a reinforcement strip or a reinforcement foil, in the region of the connection line and / or at at least one tube end, preferably by arranging the reinforcement element in the overlap region before the connection.

22. The method according to claim 21, characterized in that The reinforcement element is a foil, preferably a polyethylene foil.

23. The method according to any one of claims 11 to 22, characterized in that The tubular drainage foil forms a reinforcement area at at least one tube end in the circumferential direction, and the drainage foil exists in the reinforcement area in the form of at least two layers; Therein, the reinforcement region is preferably formed by folding down a portion of the tubular drain foil at the tube end, wherein the folding down is performed in such a way that in particular the tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drain foil in the reinforcement region.

24. The method according to any one of claims 11 to 23, characterized in that At least a portion of the tubular drain foil is rolled up from the tube opening at the tube end along the longitudinal tube axis, in particular rolled up from the inner boundary surface along the longitudinal tube axis in the direction of the outer boundary surface.

25. The method according to any one of claims 11-12 and 14-24, characterized in that After the connection, the side of the connection line facing the folding line, in particular the crease line, is completely rotated outwards by turning over the tubular drain foil.

26. The method according to any one of claims 11 to 25, characterized in that The drain foil provided in step a) is a drain foil prepared according to any one of claims 1-10.

27. A tubular drainage foil, characterized in that The tubular drain foil has a first tubular element forming an outer boundary surface and a second tubular element forming an inner boundary surface facing away from the outer boundary surface, and the second tubular element is connected to the first tubular element by at least one fastening region; The first tubular element and the second tubular element each include at least one opening for allowing body fluid to pass therethrough, and an open drainage space is formed between the outer boundary surface and the inner boundary surface.

28. The tubular drain foil according to claim 27, characterized in that The first tubular element and / or the second tubular element is a plastic foil; wherein the plastic foil preferably comprises polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid and / or cellulose.

29. The tubular drain foil according to any one of claims 27-28, characterized in that The first tubular element and the second tubular element are connected at a plurality of fastening regions, preferably at a plurality of fastening regions formed in a grid arrangement; wherein, preferably, the distance between adjacent fastening regions is 2 mm or more, preferably 3 mm or more, more preferably 5 mm or more.

30. The tubular drain foil according to any one of claims 27 to 29, characterized in that The tubular drain foil has a connection line, preferably a weld seam, which connects the first tubular element and the second tubular element and / or the first tubular element and / or the second tubular element and an elastic material.

31. The tubular drain foil according to claim 30, characterized in that The width of the connection line along the circumferential direction of the tubular drain foil is 2 mm or less, preferably 1 mm or less, and more preferably 0.5 mm or less.

32. The tubular drain foil according to any one of claims 30-31, characterized in that The thickness of the connecting line along the radial direction of the tubular drain foil is 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less.

33. The tubular drain foil according to any one of claims 27 to 32, characterized in that The basis weight of the tubular drainage foil is 10 g / m 2 Up to 200g / m 2 In the range of 40g / m 2 Up to 80g / m 2 , more preferably 50g / m 2 Up to 70g / m 2 .

34. The tubular drain foil according to any one of claims 27 to 33, characterized in that The tubular drainage foil has a tensile strength of 7N / 25.4mm or higher, an elongation at break of 40% or higher, and a porosity of 75m 3 / m 2 / min or higher, and / or the bonding strength is 0.5N / 25.4mm or higher.

35. The tubular drain foil according to any one of claims 27 to 34, characterized in that The tubular drainage foil has a tube opening at at least one tube end; preferably, the tubular drainage foil has a tube opening at one tube end and has no tube opening at the other tube end.

36. The tubular drain foil according to any one of claims 27 to 35, characterized in that The tubular drain foil has reinforcement elements, in particular reinforcement strips or reinforcement foils, at at least one tube end and / or along the connecting line.

37. The tubular drain foil according to any one of claims 27 to 36, characterized in that The tubular drain foil has a reinforced area at at least one tube end, and the drain foil is present in at least two layers in the reinforced area; wherein the reinforced area is preferably formed in the form of a two-layer edge, which is formed by folding down a part of the tubular drain foil at the tube end, wherein the downward folding is implemented in such a way that, in particular, the second tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drain foil in the reinforced area, in particular forms the outer boundary surface of the reinforced area of ​​the tubular drain foil.

38. The tubular drain foil according to any one of claims 27 to 37, characterized in that The outer boundary surface, the inner boundary surface and / or the inner cavity of the tubular drain foil consisting of the inner boundary surface comprise a sliding aid and / or an insertion aid.

39. The tubular drain foil according to claim 38, characterized in that The sliding aids include water-based lubricants, glycerol-based lubricants, polymer gels, in particular anti-allergic polymer gels, endoscope lubricants, in particular endoscope sliding gels and / or aqueous solutions, in particular sodium chloride solutions.

40. The tubular drain foil according to any one of claims 38-39, characterized in that The insertion aid comprises fabric and / or plastic; and / or the insertion aid is a tubular insertion aid arranged in the inner lumen of the tubular drainage foil.

41. The tubular drain foil according to any one of claims 27 to 40, characterized in that The length of the tubular drain foil is in the range of 0.5 cm to 40 cm, preferably 2 cm to 30 cm, more preferably 5 cm to 20 cm.

42. The tubular drain foil according to any one of claims 27 to 41, characterized in that The outer diameter of the tubular drain foil is in the range of 1 mm to 60 mm, preferably 2 mm to 50 mm, more preferably 4 mm to 30 mm.

43. A wound care kit, characterized in that A tubular drainage foil prepared according to the method of any one of claims 11 to 26 or a tubular drainage foil according to any one of claims 27 to 42, and at least one other component selected from the group consisting of an absorber, a tube, a wire, a stent and an insertion aid; Preferably, at least a portion of the at least one other component is arranged in the inner cavity of the tubular drainage foil composed of the inner boundary surface.

44. The wound care kit according to claim 43, characterized in that The absorbent body is a sponge, a foam, in particular a polyurethane or polyvinyl alcohol foam, or a gauze.

45. The wound care kit according to any one of claims 43-44, characterized in that The tube is a drainage tube.

46. ​​The wound care kit according to any one of claims 43 to 45, characterized in that The length of the wound care kit is in the range of 0.5 cm to 250 cm, preferably 10 cm to 200 cm.

47. Use of a tubular drainage foil according to any one of claims 27 to 42 or a wound care kit according to any one of claims 43 to 46 in wound care.

48. A method for caring for a wound, characterized in that The tubular drainage foil according to any one of claims 27-42 or the wound care kit according to any one of claims 43-46 is contacted with a wound of a patient.

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