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

Abstract

1. A method for manufacturing a double-walled drainage foil with open drainage spaces, comprising: i) providing a first web-like element and a second web-like element; ii) perforating the first web-like element and the second web-like element, so that at least one opening, preferably a plurality of openings, that allow the passage of body fluids, is formed in each of the first web-like element and the second web-like element; iii) placing the first web-like element on top of the second web-like element such that the first and second web-like elements are disposed substantially parallel to each other; iv) connecting the first web-like element and the second web-like element in at least one fastening area, in particular at least one point-like fastening area, preferably by ultrasonic welding, to obtain a double-walled drainage foil with an open drainage space formed between the first web-like element and the second web-like element.

Description

[Technical Field]

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

[0002] Drainage foils are needed in various types of clinical or traumatic situations, especially during or after surgery in the abdominal, thoracic, or pelvic cavities, for example, when temporary covering of open wounds and / or drainage of body fluids from the wound area is required. Covering open wounds may be necessary, for example, when several interventions are required daily, to allow rapid access to internal organs and to reduce the adverse effects of exudate formation in the wound area. Temporary covering can significantly reduce mortality in some indications. Furthermore, fluid accumulation in the wound, such as blood or wound secretions, can interfere with the healing process, so suction of body fluids, especially postoperative drainage, may be necessary to promote wound healing.

[0003] Essentially, two main requirements are set from a medical point of view for a drainage foil suitable for the described intended use. First, particularly when used in open abdominal, thoracic or pelvic cavities, good exudate management in the wound area, i.e., suction of body fluids throughout the wound area, must be achieved. Furthermore, reduced friction between the wound or surrounding organs and the drainage foil must be achieved, while at the same time the wound must be adequately shielded from the environment. Furthermore, it must be ensured that contaminants do not pass through the drainage foil into the open wound or the patient's body.

[0004] European Patent No. 0 261 167 describes a liquid-permeable wound covering, which is provided for direct contact with the wound bed and has a hydrophobic layer to prevent adhesion of the wound covering to the wound area and the resulting contamination of the wound. However, satisfactory exudate management in the wound area is not achieved with the wound covering described therein.

[0005] To improve exudate management in the wound area, US Patent No. 7,381,859 proposes a wound dressing in which a foam-like layer capable of absorbing exudate is housed between two liquid-permeable foil-like web-like elements, which may be embodied in the form of a plastic film. However, it has been found that with the wound dressing known from this document, there is a problem in that sufficient suction of exudate does not take place in the edge areas of the wound dressing, resulting in wound care complications in these edge areas.

[0006] International Patent Publication No. 2007 / 118652 describes a wound spacer grid, which allows the placement of an absorbent secondary dressing without adhesive and has a plurality of three-dimensional perforations to form a first smooth surface and a second rough surface. When this known wound dressing is used, the downstream absorbent body can be replaced to ensure satisfactory wound care over a relatively long period of time. However, even when the wound dressing system described in this document is used, it has been found that satisfactory exudate management cannot be achieved over the entire wound area, especially in the case of wounds located deep inside the body.

[0007] EP 2 424 477 describes a double-walled foil for wound dressings with an open drainage space. However, the wound dressings known from this document have proven problematic in that they are unable to achieve satisfactory coverage of complex wound areas, especially in the case of wounds located deep within the body. Furthermore, the production of known wound dressings has proven problematic in terms of production efficiency. Summary of the Invention [Problem to be solved by the invention]

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

[0009] Method for manufacturing double-walled drainage foil According to the invention, this object is achieved by a method for manufacturing a double-walled drainage foil with open drainage spaces, characterized in that it comprises the following steps: i) providing a first web-like element and a second web-like element; ii) perforating the first and second web-like elements, wherein at least one opening, preferably a plurality of openings, that allow the passage of body fluids is formed in each of the first and second web-like elements; iii) placing the first web-like element on top of the second web-like element such that the first and second web-like elements are disposed substantially parallel to each other; iv) connecting the first web-like element and the second web-like element in at least one fastening area, in particular at least one point-like fastening area, preferably by ultrasonic welding, to obtain a double-walled drainage foil in which an open drainage space is formed between the first web-like element and the second web-like element.

[0010] In the method according to the present invention, by connecting a first web-like element to a second web-like element and perforating both web-like elements, an open drainage space is formed between the individual web-like elements that allows capillary action, which on the one hand prevents body fluids, especially exudates, from leaking out of the drainage space, and on the other hand makes it possible to distribute the body fluids over the entire drainage area, without any additional measures such as providing an additional absorbent body for this purpose being absolutely necessary.

[0011] In this way, good exudate management is possible throughout the entire wound area, as there are no edge areas without capillary function which would adversely affect exudate management. The method according to the invention makes it possible to produce drainage foils that can be cut to any size or structure of the wound without any problems, even in the case of intraluminal application, and furthermore ensures the desired drainage function over the entire wound area. In this case, the method may include a drainage foil configured with a smooth surface that prevents adhesion of tissue and cells to the wound base, or in the case of surrounding organs, their adhesion. In this case, the method can include a drainage foil that is configured with a smooth surface to prevent adhesion of tissue and cells to the wound base or, in the case of surrounding organs, and further, the method can include the ingress of body fluids into the drainage space of the drainage foil being facilitated by the web-like element itself being made of a liquid-permeable material.

[0012] In this case, the stability of the drainage foil produced by the method according to the invention can be improved if it is formed by channels which start from the first or second web-like element, extend towards the other web-like element and open into the drainage space, the channel walls of which are formed integrally with the respective web-like element by perforating the web-like element.

[0013] In the last described embodiment of the present invention, If the openings or channels are arranged such that their cross-sectional area decreases in a plane extending perpendicular to the depth of the drainage foil from one web-like element to the other, in particular if a capillary action is obtained that encourages the fluid to enter the drainage space, then drainage management can be improved particularly effectively, thus on the one hand assisting the removal of exudate from the wound area and on the other hand preventing backflow from the drainage space into the wound area.

[0014] Within the scope of the present invention, it has proven particularly advantageous for effective exudate management if the at least one opening allowing the passage of body fluids has a diameter 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 good capillary action can be achieved by at least one, and preferably a large number of, openings allowing the passage of body fluids and having such a diameter.

[0015] Furthermore, it has been found that exudate management is particularly good, and particularly good stability of the drainage foil is ensured, when the first and second web-like elements are connected by a number of fastening areas, preferably formed in a grid arrangement. To ensure good suction capacity of the drainage foil, the distance between adjacent fastening areas in each case is preferably 2 mm or more, preferably 3 mm or more, more preferably 5 mm or more. The fastening areas can be arranged, for example, in a rectangular grid. A rectangular grid arrangement allows for a particularly efficient production of the drainage foil.

[0016] The web-shaped elements can be connected via multiple point-like fastening areas, preferably arranged in a grid pattern, while simultaneously ensuring a drainage space for drainage. The connection can be made by welding, gluing, or other fixed connection methods. However, the connection should not hinder, but rather aid, the removal of exudate. It has been found that ultrasonic welding not only allows for the production of drainage foils more efficiently than other methods for connecting web-shaped elements, but also produces particularly stable drainage foils whose structural integrity is guaranteed even under mechanical loads, for example, when applied intraluminally. In particular, it has been found that ultrasonic welding allows for the production of particularly durable drainage foils, achieving particularly advantageous adhesive strengths of 0.5 N / 25.4 mm or more.

[0017] Each fastening area must be 5 mm in cross section extending perpendicular to the depth direction. 2 Below, especially 3mm 2 Less than 2 mm, especially preferred 2 It has been found to be preferable that the distance between the individual fastening areas or the individual grid points of fastening areas formed in a grid-like arrangement has an area of ​​2 mm or more, in particular 3 mm or more, particularly preferably 5 mm or more.

[0018] Whether the fastening is performed by welding, adhesive bonding, or another type of connection, a material bridge connecting the inner boundary surfaces of the web-like elements to one another can be formed in the fastening area. It has been found that such a material bridge, which promotes the stability of the overall structure of the drainage foil, can be produced particularly accurately by ultrasonic welding. To achieve the desired capillary action in the drainage space, the distance between the inner boundary surfaces of the web-like elements is 5 mm or less, preferably 4 mm or less, and particularly preferably 2 mm or less.

[0019] In this case, a distance between the inner boundary surfaces of the web-like elements of at least 0.05 mm, in particular at least 0.1 mm, particularly preferably at least 0.3 mm, ensures a good distribution of exudate across the drainage foil by means of capillary action in the drainage space. For the production of high-quality drainage foils, it has proven particularly advantageous if the connection between the first and second web-like elements is effected by ultrasonic welding, since in this way the desired distance between the first and second web-like elements, in particular the distance between the inner boundary surfaces of the drainage space formed by the first and second web-like elements, can be produced precisely and in a quality-guaranteed manner. It has been found that the production of drainage foils by ultrasonic welding allows for a higher quality of drainage foil than when the distance between the internal boundaries is guaranteed only by the depth of the funnel-shaped opening, in particular, since the perforations are typically only performed with limited precision.

[0020] Regarding the use of drainage foil in wound care, the drainage foil should be 30 g / m 2 ~90g / m 2 , preferably 40 g / m 2 ~80g / m 2 , more preferably 50 g / m 2 ~70g / m 2 It has been found to be particularly advantageous if the first web-like element and / or the second web-like element have a basis weight (basis weight) in the range of 1000 to 15000. The first web-like element and / or the second web-like element may comprise or be a plastic foil, preferably comprising polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactide and / or cellulose. This type of plastic foil has the advantage of effectively preventing the penetration of pathogens, such as bacteria, as well as adhesion and ingrowth of tissue. The plastic foil may in particular comprise polyethylene, preferably low-density polyethylene (LDPE).

[0021] Web-like elements or plastic foils comprising polyethylene, particularly low-density polyethylene (LDPE), have been found to be particularly advantageous for the production and use of drainage foils according to the present invention. The first and / or second web-like elements may comprise polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactide, and / or cellulose, preferably polyethylene, more preferably low-density polyethylene (LDPE). The structure of the web-like elements can be produced by a nonwoven fabric production process. In this case, synthetic and natural (e.g., silk, cotton) fibers, as well as inorganic fibers (glass ceramic) or metal (silver fibers) can also be used to produce the nonwoven fabric or tissue.

[0022] It is further envisaged within the scope of the present invention that the web-like element is provided with an antibacterial or bacteriostatic layer on one or both sides. The antibacterial or bacteriostatic effect can be achieved, for example, by PHMB, silver, chlorhexidine, etc. In order to avoid the tendency of the drainage foils produced by the method according to the invention to stick to each other, at least one web-like element may have a hydrophilic or hydrophobic finish. Furthermore, the application of a swellable material is also envisaged.

[0023] Regarding the use of the drainage foil produced by the method according to the invention in wound care, it is preferred that the drainage foil has a tensile strength of 7N / 25.4mm or more, a breaking elongation of 40% or more, a durability of 75m 3 / m 2 It has been found to be particularly advantageous if the foil has a porosity of 0.5 N / 25.4 mm or more and / or a bond strength of 0.5 N / 25.4 mm or more, thus ensuring effective exudate management while simultaneously ensuring the structural integrity of the drainage foil.

[0024] The tensile strength is preferably measured according to DIN EN ISO 527. The drainage foil may, for example, have a tensile strength of 7 N / 25.4 mm or more, measured according to DIN EN ISO 527. The breaking elongation is preferably measured according to DIN EN ISO 527. The drainage foil may, for example, have an elongation at break of 40% or more, measured according to DIN EN ISO 527. The adhesive strength is preferably measured according to Edana NWSP 401.0.R0. The drainage foil may, for example, have a bond strength of 0.5 N / 25.4 mm or more, measured according to Edana NWSP 401.0.R0. The porosity is a measure of the ratio of the void volume to the total volume of the drainage foil.

[0025] In the case of a drainage foil produced by the method according to the invention, the at least one opening allowing the passage of body fluids can have a round, circular and / or elliptical shape, in particular with respect to the plan view of the planar area of ​​the first or second web-like element, such a shape allowing the effective passage of body fluids from the wound area into the open drainage space of the drainage foil.

[0026] In the case of a drainage foil produced by the method according to the invention, the desired removal of the drainage foil can be achieved while ensuring sufficient overall stability of the drainage foil if at least one web-like element, preferably both web-like elements, have a large number of openings, preferably arranged in a grid pattern, in particular arranged in a rectangular grid pattern, and the distance between adjacent openings or grid points of the web-like elements is 15 mm or less, preferably 5 mm or less, in particular 3 mm or less.

[0027] With regard to the desired overall stability of the drainage foil produced by the method according to the invention, it has further proven to be particularly advantageous if the mouths of the openings arranged on one of the web-like elements are arranged on a protrusion along the depth direction between the mouths of the openings arranged on the other web-like element. In order to prevent the collapse of the overall structure of the drainage foil, especially when negative pressure is applied, it has been found to be particularly effective if at least one channel, preferably a plurality of such channels, forming the openings in the web-like element, extends in the depth direction over 50% or more of the total depth of the drainage space.

[0028] To ensure the desired permeability of the web-like element, the opening area of ​​each opening facing the drainage space in a plane extending perpendicular to the depth direction is 0.1 mm 2 Above, especially 0.5mm 2 More than 1 mm, especially preferably 2 It has been found to be advantageous if the perforations are carried out in this manner. The perforation is performed so that the opening area of ​​the resulting drainage foil is 5 mm 2 Below, especially 4mm 2 Less than 3 mm, especially preferred 2 If done as follows, the desired capillary action can be achieved while avoiding backflow from the drainage space into the wound site.

[0029] As already explained, the openings of the channels forming the web-like element are formed by perforations in the web-like element. In this connection, it has been found to be advantageous if the channel walls, in a cross section extending parallel to the depth direction, are at least partially arcuate in configuration and are continuously connected to the border regions of the web-like element, in order to obtain a smooth surface that can effectively inhibit adhesion of tissue or cells to the wound base or surrounding organs.

[0030] The method according to the present invention may include attaching an adhesive, in particular an adhesive, adhesive material, and / or hook-and-loop fastener, in particular one or more barbs, to the drainage foil. Such adhesive, adhesive material, or hook-and-loop fastener allows the manufactured drainage foil to be fixed to another structure, for example, a body part, a surgical device, an absorbent body, a tube, a wire, a stent, an insertion aid, and / or a device for negative pressure therapy. For example, the method may include attaching adhesive, adhesive material, and / or hook-and-loop fastener to two opposite edges of the drainage foil. Such a drainage foil can then be wrapped around a structure selected from, for example, an absorbent body, a tube, a wire, a stent, an insertion aid, and a device for negative pressure therapy, and used to fix the drainage foil to the structure by connecting the adhesive, adhesive material, or hook-and-loop fastener on the two opposite edges.

[0031] With regard to manufacturing technology, 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 after step ii).

[0032] The method according to the present invention may further comprise forming a three-dimensional, preferably tubular, structure from the drainage foil.The advantage of such a three-dimensional structure, e.g., a tubular structure, is that it can be used for more complex wounds, for example, deep wounds, or deep areas of the body.In particular, such a three-dimensional structure, e.g., a tubular structure, can even be used intraluminally, for example, in the gastrointestinal tract or fistula tract.The drainage foil may be tubular, for example, for intraluminal application and / or to receive a drainage tube.

[0033] With regard to the manufacturing technique, it has proven to be particularly advantageous if such a three-dimensional structure is formed by a first web-like element and a second web-like element connected in step iv) by welding, in particular ultrasonic or laser welding, by thermal bonding, in particular by UV or hot air, using adhesives and / or by deep drawing, in particular by deep drawing.

[0034] Method for manufacturing a tubular drainage foil The object of the invention is further achieved by a method according to the invention for producing a tubular drainage foil, characterized in that it comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with open drainage spaces, more preferably a double-walled drainage foil manufactured according to the method according to the invention for manufacturing a double-walled drainage foil; b) folding the drainage foil onto itself around a fold line, in particular a crease line, so that the drainage foil has an overlapping area that can be connected to the connecting line, preferably the drainage foil has a first edge and a second edge that extends substantially parallel to the first edge, and the drainage foil is folded onto itself or creased along the fold line or crease line, respectively, so that the drainage foil has an overlapping area along the first edge and the second edge that can be connected to the connecting line; c) connecting the drainage foil along the overlapping area to form a connecting line; d) Obtaining a tubular drainage foil.

[0035] Furthermore, the object of the present invention is achieved by a method according to the invention for producing a tubular drainage foil, which method comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with open drainage spaces, more preferably a double-walled drainage foil manufactured according to the method according to the invention for manufacturing a double-walled drainage foil; b) placing a first edge of the drainage foil on the elastic material such that an overlap area is formed between the first edge of the drainage foil and the elastic material, which can be connected to a connecting line; c) connecting the drainage foil and the elastic material along an overlapping region between the drainage foil and a first edge of the elastic material to form a connecting line; d) folding, in particular scoring, the drainage foil onto the elastic material along the fold line, in particular the crease line, so that an overlapping area connected to the connecting line is formed between a second edge of the drainage foil, preferably a second edge of the drainage foil extending substantially parallel to the first edge, and the elastic material; e) connecting the drainage foil and the elastic material along an overlapping region between the second edge of the drainage foil and the elastic material to form a connecting line; f) Obtaining a tubular drainage foil.

[0036] The object of the invention is also achieved by a method according to the invention for producing a tubular drainage foil, which method comprises the following steps: a) providing a drainage foil, preferably a double-walled drainage foil with open drainage spaces, more preferably a double-walled drainage foil manufactured according to the method according to the invention for manufacturing a double-walled drainage foil; b) winding the drainage foil around a winding shaft so that the drainage foil has an overlapping area, which is formed by winding around the winding shaft and can be connected to a connecting line, and the drainage foil is present in at least two layers; c) connecting, preferably by adhesive or connecting means, the first and second layers of drainage foil present in the at least two layers in the overlapping area, preferably forming a connecting line; d) Obtaining a tubular drainage foil.

[0037] It has been found that each of the above-mentioned methods according to the invention for manufacturing a tubular drainage foil efficiently provides a tubular drainage foil that allows uniform drainage performance even in complex wound areas, for example in the case of wounds deep in the body. The following description relates to all three of the above-mentioned methods according to the invention for manufacturing a tubular drainage foil. Each of the above-mentioned methods for manufacturing a tubular drainage foil may have the following characteristics:

[0038] With regard to the manufacturing techniques, it has proven to be particularly advantageous if the connection is effected by welding, in particular ultrasonic welding or laser welding, thermal bonding, in particular UV or hot air, adhesive, in particular adhesive or hook-and-loop fasteners, and / or by connecting means, in particular clamps. In particular, the connection of the drainage foil along the overlap region, the connection of the drainage foil and the elastic material along the overlap region between the first edge of the drainage foil and the elastic material, the connection of the drainage foil and the elastic material along the overlap region between the second edge of the drainage foil and the elastic material, and the connection of the first and second layers of drainage foil present in the overlap region, of which there are at least two, can be effected by welding, in particular ultrasonic welding or laser welding, thermal bonding, in particular UV or hot air, thermal bonding with adhesive, in particular adhesive or hook-and-loop fasteners, and / or welding by connecting means, in particular clamps, in particular ultrasonic welding or laser welding.

[0039] The connecting means may be, for example, a clamp, a cord, a screw, a seam, for example, an elastic seam or a seam with elastic material, or a circular application aid. For example, the drainage foil may be wound around a winding shaft, which in turn is wound around a drainage tube, and then secured as a tubular drainage foil by a connecting means, for example, a clamp or a circular application aid. The overlapping region, for example, the overlapping region between the first and second edges of the double-walled drainage foil, may be connected by an elastic seam. The elastic seam increases the extensibility of the tubular drainage foil.

[0040] The produced tubular drainage foils have particularly advantageous properties for medical applications if the connection is made by ultrasonic welding, preferably at a speed in the range of 0.1 to 5.0 m / min, a power in the range of 50 to 500 watts, and / or a pressure in the range of 5 N to 100 N. Such a connection allows for a stable connection line that ensures high tensile strength even under mechanical loads.

[0041] The connection in the method according to the invention for producing a tubular drainage foil, in particular the connection of the drainage foil along the overlap region, the connection of the drainage foil and the elastic along the overlap region between a first edge of the drainage foil and the elastic, the connection of the drainage foil and the elastic along the overlap region between a second edge of the drainage foil and the elastic, and / or the connection of the first and second layers of drainage foil present in at least two layers in the overlap region, can comprise the steps of placing the drainage foil in an ultrasonic welding device and welding the drainage foil by means of a welding die, in particular an L-shaped welding die, to form the tubular drainage foil. It has been found that tubular drainage foils can be produced efficiently and with high quality with a corresponding welding die.

[0042] It has further been found that if the connection is made by ultrasonic welding using a cutting wheel with a cutting edge radius of 0.2 mm or less and / or with a cutting wheel with a grinding angle facing the fold line, in particular the fold line, of 15° or less and / or with a cutting wheel with a grinding angle facing away from the fold line, in particular the fold line, of 75° or less, the properties of the cut edge are particularly suited to the function of the drainage foil, thus preventing material residues remaining on the cut edge which could impair the functionality of the drainage foil.

[0043] The connection by welding, in particular ultrasonic welding, can be carried out, for example, by heating and thus melting the material in the overlap area, for example a double-walled drainage foil and / or an elastic material, by means of a sonotrode vibrated by a generator. To create the weld seam, a cutting wheel can be used, for example, a cutting wheel that can weld and cut simultaneously. A cutting wheel that can weld and cut simultaneously creates a weld seam in which excess material is simultaneously removed during the welding process. Conventional cutting wheels can also be used to produce the connecting wire. Ultrasonic welding can be performed, for example, with a Nucleus Rotosonic™ DX1-TC 12 flatbed ultrasonic welding device, for example, at an ultrasonic frequency of about 35 kHz.

[0044] In order to provide a connection line that is as smooth as possible, in particular to prevent functional impairment of the tubular drainage foil as a result of a rough connection line, an edge strip of the drainage foil that is located on the side of the connection line opposite the fold line, in particular the crease line, can be removed during or after connection, in particular by punching. Furthermore, punching can be used to remove any remaining material that is not needed.

[0045] It has been found to be particularly advantageous for the functionality of the tubular drainage foil if the method is carried out in such a way that the connecting line, e.g. the weld seam, has a width along the circumferential direction of the tubular drainage foil of 2 mm or less, preferably 1 mm or less, more preferably 0.5 mm or less.

[0046] It is particularly advantageous to provide as narrow a connecting line, especially a weld seam, as possible to prevent any functional impairment of the product. Furthermore, it has been found to be particularly advantageous to ensure functionality in the entire area of ​​the tubular structure, extending along the radial or depth direction of the tubular drainage foil, especially perpendicular to the tube axis, if the connecting line has a thickness of 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less. Due to the way in which the connection is performed in the method for producing a tubular drainage foil according to the invention, the material melts in the overlap area, especially at the connecting line, thus forming a material bridge, for example, when the connection is performed by welding, especially ultrasonic welding.

[0047] According to the invention, the method for increasing the stability of the drainage foil comprises attaching a reinforcing element, in particular a reinforcing strip or reinforcing foil, in the region of the connecting line, preferably the reinforcing element being arranged in the overlap region and / or at least one tube end before connection. The reinforcing strip can be provided, for example, by a drainage foil applied in a double layer in the area to be reinforced, or by a reinforcing material, for example a polyethylene foil, fixed to the area to be reinforced. Foils, in particular polyethylene foils, have been found to have a particularly advantageous reinforcing effect as reinforcing elements.

[0048] For example, reinforcing elements may be additionally welded together during connection by reinforcing elements arranged in the overlapping areas before connection, thus increasing the tear strength of the drainage foil, especially at the connection line. Reinforcing elements not only have the advantage of increasing the tear strength of the drainage foil, but can also provide further advantages, which may be embodied, for example, as radiographically visible reinforcing elements. This allows, for example, the tubular drainage foil to be precisely positioned on the target structure under radiographic control.

[0049] The excellent structural integrity of the tubular drainage foil can also be further improved if the tubular drainage foil is circumferentially formed at least on one tube end with a reinforced region and the drainage foil is present in at least two layers, which is particularly advantageous for applications in which auxiliary devices, such as absorbers, tubes, wires, stents or insertion aids, are inserted into the tubular drainage foil, for example during surgery or during the manufacture of wound care kits.

[0050] The tube opening is further stabilized by the reinforcement region, so that any desired auxiliary tool can be inserted into the tubular drainage foil without risk of the drainage foil tearing.From a production engineering standpoint, it has proven advantageous if the tubular drainage foil is formed in part by folding over the tube end, in particular the edge region of the tubular drainage foil, the folding being carried out in particular in such a way that the tubular element forming the inner boundary surface of the tubular drainage foil, in the reinforcement region, forms the outer boundary surface of the tubular drainage foil. The method further comprises a step of fastening the folded portion of the tubular drainage foil, for example at points, in particular by welding, thermobonding, adhesive and / or connecting means. "Folding" should be understood to mean any shaping, positioning, bending, wrapping or folding of the drainage foil, in which overlapping areas, in particular overlapping areas that may be connected to connecting lines and / or reinforced areas with the drainage foil, may be achieved.

[0051] The method for producing a tubular drainage foil according to the invention comprises rolling up at least a portion of the tubular drainage foil along the longitudinal tube axis, starting from the tube opening at the tube end, in particular along the longitudinal tube axis starting from the inner boundary surface in the direction of the outer boundary surface. The tubular drainage foil can be partially or completely rolled up. It has been found that application of a rolled-up tubular drainage foil is simplified compared to an unrolled drainage foil, since the user simply rolls the tubular drainage foil onto a structure, such as a drainage tube or probe, to cover the structure with the tubular drainage foil.

[0052] It has been found to be advantageous if, after connection, the fold line, in particular the side of the connecting line facing the fold line, is rotated completely outward by turning the tubular drainage foil over, in the sense that the smooth surface of the outer connecting line of the tubular drainage foil ensures high functionality of the tubular drainage foil in the region of the connecting line.

[0053] To achieve particularly good drainage effects with the resulting tubular drainage foil, the drainage foil provided in step a) of the method for producing a tubular drainage foil according to the invention may be a drainage foil produced according to the method for producing a double-walled drainage foil according to the invention. The structure of the resulting drainage foil prevents the collapse of the open drainage space between the two layers, which is assisted by the fastening area. Thus, suction distribution over the entire area of ​​the tubular drainage foil, right up to the edge area, is guaranteed, and the drainage foil effectively removes exudate.

[0054] Tubular drainage foil According to the present invention, the object of the invention is further achieved by a tubular drainage foil comprising a first tubular element forming an outer boundary surface and a second tubular element forming an inner boundary surface facing away from said outer boundary surface, said second tubular element being connected to said first tubular element by at least one fastening area, said first tubular element and said second tubular element each comprising at least one opening allowing the passage of body fluids, and wherein an open drainage space is formed between said outer boundary surface and said inner boundary surface. In the tubular drainage foil according to the invention, capillary action is achieved between the two tubular elements by means of open drainage spaces, which allows body fluids, in particular exudates, to flow out or be sucked out throughout the entire tubular structure. Even in more complex wounds, for example wounds located deep inside the body, in particular in the case of intraluminal applications, effective exudate management can be ensured by the tubular drainage foil according to the invention. The tubular drainage foil according to the invention has the advantage that it can not only be used on the surface of the wound, but can also be placed between organ structures to effectively absorb body fluids, for example exudates.

[0055] The first and / or second tubular element may comprise or be a plastic foil, preferably comprising polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactide, and / or cellulose. This type of plastic foil has the advantage of effectively preventing the penetration of pathogens, such as bacteria, as well as adhesion and ingrowth of tissue. The plastic foil may in particular comprise polyethylene, preferably low-density polyethylene (LDPE). Tubular elements or plastic foils comprising polyethylene, in particular low-density polyethylene (LDPE), have been found to be particularly advantageous for the manufacture and use of the tubular drainage foil according to the present invention. The first and / or second tubular element may comprise polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactide, and / or cellulose, preferably polyethylene, more preferably low-density polyethylene (LDPE).

[0056] It is further envisaged within the scope of the present invention that the tubular element is provided with an antibacterial or bacteriostatic layer on one or both sides. The antibacterial or bacteriostatic effect can be achieved, for example, by PHMB, silver, chlorhexidine, etc. In order to avoid the tendency of the drainage foils produced by the method according to the invention to stick together, at least one tubular element may have a hydrophilic or hydrophobic finish. Furthermore, the application of a swellable material is also envisaged.

[0057] In terms of the structural integrity of the tubular drainage foil, it has been found to be preferable for the first and second tubular elements to be connected by a number of fastening areas, preferably formed in a grid arrangement. The distance between adjacent fastening areas is preferably at least 2 mm, preferably at least 3 mm, more preferably at least 5 mm, in order to ensure good capillary action of the open drainage space formed between the first and second tubular elements. The multiple fastening areas can be arranged, for example, in a rectangular grid.

[0058] In addition, the individual fastening areas are 5mm 2 Below, especially 3mm 2 Less than 2mm is especially desirable 2 The following regions have proven to be convenient for effective capillary action in cross sections extending perpendicular to the radial or depth direction: the depth direction is in particular the direction extending perpendicular to the boundary surface; the radial direction is in particular the direction extending perpendicular to the longitudinal tube axis.

[0059] Whether the fastening in the fastening region is performed by welding, e.g., ultrasonic welding, adhesive bonding, or another type of connection, a material bridge connecting the tubular elements to one another can be formed in the fastening region. It has been found that such a material bridge, which promotes the stability of the overall structure of the tubular drainage foil, can be produced 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 tubular elements that define the open drainage space is not more than 5 mm, preferably not more than 4 mm, and particularly preferably not more than 2 mm.

[0060] In this case, if the distance between the inner boundary surfaces of the tubular elements defining the drainage space is 0.05 mm or more, in particular 0.1 mm or more, and particularly preferably 0.3 mm or more, it is possible to ensure distribution of exudate throughout the entire tubular drainage foil by utilizing capillary action in the drainage space. The tubular drainage foil has a distance between the inner boundary surfaces of the tubular elements that defines a drainage space, preferably at least 50% of the area of ​​the drainage foil, preferably at least 70% of the area of ​​the drainage foil.

[0061] The tubular drainage foil according to the invention can have a connecting line, preferably a welded seam, connecting the first tubular element to the second tubular element and / or the first and / or second tubular element to the elastic material. The connecting line can be provided by, for example, welding, in particular ultrasonic welding or laser welding, thermal bonding, in particular UV or hot air thermal bonding, adhesive, in particular adhesive or hook-and-loop fasteners, and / or by a connecting means, in particular a clamp. For example, the connecting line can be created by placing a first edge of the drainage foil on a second edge of the drainage foil and connecting the second edges to each other, for example by ultrasonic welding, resulting in a connecting line, for example a welded seam, between the first and second edges.

[0062] It has been found to be particularly advantageous for the functionality of the tubular drainage foil if the connecting lines, e.g. weld seams, have a width along the circumferential direction of the tubular drainage foil of 2 mm or less, preferably 1 mm or less, more preferably 0.5 mm or less. Furthermore, it has proven particularly advantageous to ensure functionality over the entire area of ​​the tubular structure if the connecting lines have a thickness along the radial or depth direction of the tubular drainage foil of 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less.

[0063] Regarding the use of tubular drainage foil in wound care, the drainage foil should be 30 g / m 2 ~90g / m 2 , preferably 40 g / m 2 ~80g / m 2 It has been found to be particularly advantageous if the drainage foil has a tensile strength of 7 N / 25.4 mm or more, an elongation at break of 40% or more, a tensile strength of 7 N / 25.4 mm or more, a breaking elongation of 75 m or more, a grammage (basis weight) of 50 g / m or more, and more preferably .... 3 / m 2 / min or more and / or a bond strength of 0.5 N / 25.4 mm or more, it is possible to ensure effective drainage management while simultaneously ensuring the structural integrity of the drainage foil. The tensile strength is preferably measured in accordance with DIN EN ISO 527.

[0064] The tubular drainage foil may have a tensile strength of 7 N / 25.4 mm or more, measured according to DIN EN ISO 527, for example. The breaking elongation is preferably measured according to DIN EN ISO 527. The tubular drainage foil may have a breaking elongation of 40% or more, measured according to DIN EN ISO 527, for example. The adhesive strength is preferably measured according to Edana NWSP 401.0.R0. The tubular drainage foil may have a bond strength of 0.5 N / 25.4 mm or more, measured according to Edana NWSP 401.0.R0, for example. Porosity is a measure of the ratio of the void volume to the total volume of the drainage foil.

[0065] 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 a continuous material at the other end of the tubular structure, for example web-like elements connected by connecting lines and / or tubular elements forming the tube end. Alternatively, a tubular drainage foil can be provided with tube openings at both ends of the tube. For some applications, for example for drainage in the case of wounds deep in the body, it has proven to be particularly advantageous if the tubular drainage foil has a tube opening at one tube end and no tube opening at another tube end.

[0066] According to the present invention, the tubular drainage foil can have a reinforcing element, in particular a reinforcing strip or foil, along at least one tube end and / or along the connecting line. The reinforcing strip can be, for example, in the area where a material, such as a double-walled drainage foil, in particular a drainage foil produced by the method according to the present invention for producing a double-walled drainage foil, is present in two layers, and / or in the area where a reinforcing material, such as a polyethylene foil, is fixed to the first tubular element and / or the second tubular element. Foil, in particular polyethylene foil, has been found to have a particularly advantageous reinforcing effect as a reinforcing element. The structural integrity of the tubular drainage foil is particularly enhanced when the connecting line and / or at least one tube opening has / has a reinforcing element.

[0067] The excellent structural integrity of the tubular drainage foil according to the invention is further enhanced if the tubular drainage foil has a reinforced region at at least one tube end, which is present in at least two layers. This is particularly advantageous for applications in which an auxiliary device, such as an absorbent, a tube, a wire, a stent, or an insertion aid, is inserted into the tubular drainage foil. The reinforced region further stabilizes the tube opening, so that any desired auxiliary device can be inserted into the tubular drainage foil without risk of tearing the drainage foil. From a production perspective, it has proven advantageous to form the reinforced region in the form of a two-layer edge formed by folding a portion of the tubular drainage foil at the tube end, in particular so that the second tubular element forming the inner boundary of the tubular drainage foil, in particular the outer boundary of the reinforced region of the tubular drainage foil, is formed within the reinforced region. The folded end can be fixed in a point-like manner.

[0068] 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 lumen of the tubular drainage foil contained in the inner boundary surface of the tubular drainage foil may be provided with sliding and / or insertion aids. Such sliding and / or insertion aids can further enhance ease of use and simplicity of application. For example, the outer boundary surface and / or the inner boundary surface of the tubular drainage foil may be configured with a low-friction surface, in particular an anti-stick coating and / or a micro-rough surface, to facilitate insertion. In particular, the outer boundary surface and / or the inner boundary surface of the tubular drainage foil may comprise or be coated with silicone, polytetrafluoroethylene (PTFE), and / or water to facilitate insertion.

[0069] Examples of sliding aids that significantly increase the sliding ability include aqueous lubricants, glycerol-based lubricants, polymer gels, particularly antiallergic polymer gels, endoscope lubricants, particularly endoscope sliding gels, and / or aqueous solutions, particularly sodium chloride solutions. It is particularly advantageous for the materials used as sliding aids to dissolve without residue, especially in aqueous solutions, to prevent material residue from remaining on the product. Insertion aids comprising fabrics and / or plastics are particularly suitable as insertion aids. The insertion aids may include a low-friction surface, particularly an anti-stick coating and / or a micro-rough surface. For example, the insertion aid may include fabrics and / or plastics, which may contain silicone, polytetrafluoroethylene (PTFE), and / or water, or may be coated with silicone or polytetrafluoroethylene (PTFE).

[0070] The insertion aid may be a tubular insertion aid arranged within the inner lumen of the tubular drainage foil, 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 configured with a predetermined break point at the closed tube end of the tubular insertion aid. The tubular drainage foil may be provided in a single-lumen or multi-lumen format.

[0071] The tubular drainage foil can have a length ranging from 0.5 cm to 40 cm, preferably from 2 cm to 30 cm, more preferably from 5 cm to 20 cm, so that it is particularly advantageous for many applications, such as intraluminal applications, applications in gynecology or urology, and applications in thoracic, visceral, and / or hip surgery. However, longer or shorter tubular drainage foils can also be provided. For example, tubular drainage foils with lengths of 10 cm or more, or 20 cm or more, are suitable for intraluminal applications in the gastrointestinal tract and fistula tracts. For application in various wound cavities, the length can be adapted to the wound cavity; for example, tubular drainage foils with lengths of 10 cm or less can be provided for wound cavities, or for smaller wound cavities with lengths of 5 cm or less, for example 2 cm or less.

[0072] Furthermore, tubular drainage foils are particularly suitable for many applications in terms of effective wound management if they have an outer diameter in the range of 1 mm to 60 mm, preferably 2 mm to 50 mm, more preferably 4 mm to 30 mm. However, tubular drainage foils with larger or smaller outer diameters can also be provided. For narrow wounds and / or in deeper areas of the body, such as the pancreas, for gynecological or urological applications, and for intraluminal applications, tubular drainage foils with small outer diameters are particularly suitable, for example tubular drainage foils with an outer diameter of 5 mm or less, in particular 4 mm or less.

[0073] The tubular drainage foil according to the present invention has the advantage that even when the drainage foil has a small outer diameter, uniform drainage performance is ensured and clogging of the drainage outlet by tissue is prevented. Therefore, the tubular drainage foil allows active drainage of liquid even when the outer diameter is very small. In invasive surgery, such as in the case of hip joints, and especially in the case of large wound areas, tubular drainage foils with larger outer diameters, for example, 6 mm or more, can also be used. Depending on the accessibility and size of the wound area, tubular drainage foils with appropriate lengths and outer diameters can be provided.

[0074] Wound Care Kit The object of the present invention is further achieved by a wound care kit according to the present invention, which comprises a tubular drainage foil manufactured by the method according to the present invention for manufacturing a tubular drainage foil according to the present invention or a tubular drainage foil according to the present invention and at least one further component selected, for example, from an absorbent body, a tube, a wire, a stent and an insertion aid. In terms of particularly simple handling of the wound care kit, it has proven advantageous if at least a part of the at least one further component is arranged within the inner lumen of the tubular drainage foil defined by the inner boundary surface. For particularly efficient negative pressure therapy, the wound care kit may, for example, comprise a tubular drainage foil and a drainage tube, with part of the drainage tube being arranged within the inner lumen of the tubular drainage foil. The drainage tube may be connected to a negative pressure source. The at least one further component may be arranged partially or completely within the tubular drainage foil.

[0075] In a particularly preferred embodiment of the present invention, the absorbent body is a sponge, a foam, particularly a polyurethane or polyvinyl alcohol foam, or gauze. It has been found that a wound care kit including such an absorbent body allows for efficient suction of fluids from a body region, particularly a wound region. When the absorbent body is placed within the inner lumen of the tubular drainage foil defined by the inner boundary surface, adhesion of tissue to the absorbent body is prevented. Thus, fluids can be efficiently and non-traumatically suctioned from the wound region.

[0076] In particular, in terms of advantageous suction efficiency, it has proven preferable 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 for the suction of large amounts of liquid. Since tubular drainage foils can be provided in any dimensions, in particular any outer diameter, any length and any shape, the wound care kit can be used with tubes and / or tubes with complex geometries, for example multi-lumen geometries.

[0077] The wound care kit according to the present invention can have a length ranging from 0.5 cm to 250 cm, preferably from 10 cm to 200 cm. The length of the wound care kit can 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 can be provided for intraluminal application in the gastrointestinal tract or for application in a fistula tract. For application in a wound cavity, the length can be adapted to the respective wound cavity; for example, the wound care kit can have a length of less than 10 cm, less than 5 cm, or less than 2 cm, depending on the size or depth of the wound cavity.

[0078] Medical Uses and Methods for Wound Care The present invention further relates to a tubular drainage foil according to the invention for use in wound care and to a wound care kit according to the invention, e.g. for draining a wound and / or for use in a method according to the invention for caring for a wound. The tubular drainage foil or wound care kit is preferably used for drainage, e.g., during and / or after surgery. The tubular drainage foil according to the invention or the wound care kit according to the invention is preferably used for draining body fluids from a wound area, e.g., during surgery.

[0079] The tubular drainage foil and wound care kit according to the present invention allow for simple and reliable suction of fluids from wounds. The tubular drainage foil and wound care kit according to the present invention can be used, for example, in intraluminal areas, such as the gastrointestinal tract, gynecological and urological areas, surgical procedures, such as thoracic, visceral and hip surgery, and negative pressure therapy. The tubular drainage foil or wound care kit can be used for drainage, particularly within surgery. Thus, the accumulation of blood, wound secretions and / or tissue fluids in the wound cavity, which typically accumulate during surgical interventions, can be prevented by applying drainage. In this way, the healing process can be significantly accelerated.

[0080] The tubular drainage foil or wound care kit according to the present invention can be particularly advantageously used in conjunction 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 the wound, particularly the wound base, and a wound packing material or an exudate removal area, such as 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 tissue. In this case, the tubular drainage foil is applied to the wound, providing drainage functionality and a very smooth surface to prevent adhesion or friction between the tissue and the foil.

[0081] The tubular drainage foil or wound care kit according to the invention may be anatomically preformed, but may also be constructed in such a way that it can be tailored to a particular situation. When used in combination with negative pressure therapy, the tubular drainage foil according to the invention can be filled with a filling medium such as gauze or foam or a wound care kit and / or a drainage tube can be inserted. The tube used to drain exudate or for wound drainage can be led from inside the body, for example from the abdominal cavity, and connected to a negative pressure source, which can be ensured by a pump or, in hospitals, by central home care. Using a negative pressure source, the exudate can then be removed from the wound by the tubular drainage foil or wound care kit according to the invention, so that good exudate management is achieved.

[0082] In the case of medical use of the tubular drainage foil or wound care kit according to the invention, the following advantages are obtained: - Openings that allow the passage of fluids aid in the removal of exudate and prevent backflow of exudate into the wound space (capillary action). - The tubular drainage foil prevents adhesion of tissue or cells to the wound base or, in the case of surrounding tissue, to the wound. - The tubular drainage foil or wound care kit can be adapted to any size or structure of the wound area without compromising the drainage function, thus making it possible to care also for complex wounds.

[0083] The present invention also relates to a method for caring for a wound, characterized in that the tubular drainage foil according to the present invention or the wound care kit according to the present invention is brought into contact with the wound of a patient. In particular, the tubular drainage foil or wound care kit is brought into contact with the wound of a patient so that bodily fluids, such as exudate or blood, can flow from the wound into the tubular drainage foil or wound care kit. The tubular drainage foil according to the present invention and the wound care kit according to the present invention allow for effective drainage or suction of bodily fluids, in particular blood or wound fluid, from the wound. The method for caring for a wound according to the present invention has the advantage that bodily fluids are effectively suctioned and the penetration of bacteria or other pathogens into the wound area is prevented.

[0084] The method for wound care may also be a method for draining a wound. The method for wound care may be used in all medical fields and in all areas of the body, including intraluminal application, gynecological or urological applications, and in thoracic, visceral, and / or hip surgery. As explained above, the length and / or outer diameter of the tubular drainage foil or wound care kit can be adapted to the requirements of the respective wound area; for example, a smaller outer diameter can be used for intraluminal application in 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, since the shape of the tubular drainage foil or wound care kit can be adapted according to the shape of the respective area of ​​the body, wound, or required drainage area.

[0085] According to the present invention, it is provided to provide a tubular drainage foil or wound care kit having any shape, any size, and any outer diameter suitable for any wound or any medical application.For example, the tubular drainage foil can be round or cylindrical, or can be configured as a flat tubular drainage foil, particularly a flat drainage foil, for application in the gastrointestinal tract or fistula.Furthermore, the tubular drainage foil can be provided in any dimension.

[0086] The method for wound care according to the invention has the advantage over other methods for wound care in that the tubular drainage foil adheres less to the tissue compared to absorbent materials such as polyurethane foam, thereby reducing the risk of damage and bleeding. The method according to the invention is therefore also suitable for sensitive body areas, such as areas of blood vessels or pre-damaged tissue, and for patients at high risk of bleeding. Furthermore, a tubular drainage foil or wound care kit can be used, which can be used for a wider range of applications, as it corresponds to the anatomical and drainage requirements in the wound area. [Brief explanation of the drawings]

[0087] The invention will be described below with reference to the drawings, to which explicit reference is made for all details that are essential to the invention and that are not emphasized in more detail in the specification. [Figure 1] 1 is a schematic diagram of an ultrasonic welding device. [Figure 2] FIG. 1 is a schematic diagram of a drilling device. [Figure 3] FIG. 1 is a schematic diagram of a device for inverting a tubular drainage foil. [Figure 4] Schematic illustration of a creasing or winding technique, in which the drainage foil is folded, in particular creased, around a fold line, in particular a crease line, or wound around a winding shaft so that the drainage foil has an overlapping area where it can be connected to a connection line. [Figure 5] FIG. 1 is a schematic diagram of a self-adhesive drainage foil that can be rolled up or folded to be used as a tubular drainage foil. [Figure 6] FIG. 1 is a schematic diagram of a self-adhesive drainage foil that can be used as a tubular drainage foil, for example by wrapping or folding it around a drainage tube. [Figure 7] 1 is a schematic view of a connecting line, in particular a welded seam; [Figure 8] FIG. 10 is a schematic view of the attachment of a reinforcing element to a drainage foil. [Figure 9]FIG. 10 is a schematic diagram of an insertion aid. [Figure 10] 1 is a schematic diagram of a process for rolling up a tubular drainage foil and the rolled up tubular drainage foil. FIG. [Figure 11] Schematic diagram of a tubular drainage foil with elastic material. [Figure 12] Schematic diagram of a tubular drainage foil with edges reinforced by folding. [Figure 13] FIG. 1 is a schematic diagram of a tubular drainage foil. [Figure 14] Schematic diagram of a tubular drainage foil with a tube. [Figure 15] Schematic diagram of a tubular drainage foil with a tube and an absorbent body. [Figure 16] Schematic diagram of a tubular drainage foil with a tube. DETAILED DESCRIPTION OF THE INVENTION

[0088] The ultrasonic welding device shown in Figure 1 can be used to manufacture the drainage foil 3 according to the invention, in particular the tubular drainage foil 3a. For example, the ultrasonic welding device can be used to manufacture the tubular drainage foil 3a by simultaneous punching and welding, in which, as a result of the ultrasonic welding, the overlapping material is connected in the overlapping area to form a connecting line 11, while simultaneously removing the edge strip of remaining material. The double-walled drainage foil 3b is inserted in a folded state into the base 4 and fixed therein.

[0089] The ultrasonic welding die 1, for example an L-shaped one, is located in a bracket 2 located above a base 4. A generator applies the required voltage to the welding die 1. The welding die 1 moves downwards and welds the contour of the tubular drainage foil 3a. Once the welding operation is complete, the bracket 2 returns to its starting position. The tubular drainage foil 3a can then be removed. The left-hand illustration shows a plan view of the ultrasonic welding device, while the right-hand illustration shows a side view.

[0090] The perforation device shown in FIG. 2 can be used to produce the drainage foil 3 according to the invention. The provided double-walled drainage foil 3b is inserted, folded on one side, into the lower die half of a punching tool. A heated, integrated cutting tool is located in the lower die half of the punching tool. The punching operation begins by lowering the upper die half. In the same operation, a hot, sharp cutting element 5 welds the drainage foil 3b to the cutting edge and separates it, resulting in a tubular drainage foil 3a with a welded seam 6. The foil residue 7 is removed by punching. The die is then opened by moving the upper die half upward, allowing the tubular drainage foil 3a to be removed.

[0091] The device shown in Fig. 3 can be used to evert a tubular drainage foil 3a. First, the tubular drainage foil 3a is manufactured by one of the methods described above, for example by welding the overlapping areas to form the connecting lines 11. For use in wound areas, it has proven particularly advantageous if the connecting lines 11 have a smooth surface on the outside of the tubular drainage foil 3a, particularly to prevent tissue adhesion. To create a smooth surface on the welded seam 6, the tubular drainage foil 3a can be everted from the inside out, with the side 10 of the connecting lines 11 facing the fold line, particularly away from the fold line, becoming the side 12 of the connecting lines 11 facing the fold line, particularly towards the fold line, after everting. The tubular drainage foil 3a is pulled over the upper movable ram 8 of the illustrated device to turn it over or invert it. A sleeve 9 then travels over the movable ram 8 and rotates the tubular drainage foil 3a with the help of a rigid counter ram 13.

[0092] The folding or wrapping technique shown in FIG. 4 can be used to place the drainage foil 3 in a plane around a winding axis 27, for example onto the tip of the tube 16 or to fold it onto the tube 16. For example, the drainage foil 3 can be wound around the winding shaft 27 so that the drainage foil 3 is formed by winding around the winding shaft 27 and can be connected to the connecting wire 11, the drainage foil 3 having an overlapping area in which there are at least two layers. The overlapping area can then be connected or fixed by connecting means such as, for example, adhesive 14 or clamps, seams or ring application aids, to obtain a tubular drainage foil 3a.

[0093] The self-adhesive drainage foil 3 shown in Figure 5 can be secured to any desired structure, for example to a body part, a surgical device, an absorbent body, a tube, a wire, a stent, an insertion aid 22, and / or a device for negative pressure therapy. The drainage foil 3 may be secured to the structure or structure periphery by wrapping or folding it around another structure using an adhesive 14, in particular glue, adhesive and / or one or more hook-and-loop fasteners 15, attached to the drainage foil 3, in particular in the form of a tube. Such a drainage foil 3 can be used as a self-adhesive tubular drainage foil 3a and has the advantage that it can be adapted in situ to the construction requirements, e.g. the size of the wound cavity.

[0094] While the drainage foil 3 is being wrapped or folded around a corresponding structure, for example around a drainage tube, the adhesive or adhesive parts of the drainage foil 3 can be fixed to another part of the drainage foil 3. If the drainage foil 3 fixed to the structure in this way has to withstand particularly high mechanical loads, the drainage foil 3 can be additionally fixed by means of a seam, if necessary. According to the invention, the drainage foil 3 can be provided with one or more adhesive parts, in particular the adhesive 14 can be attached to one part or two or more parts by means of which two complementary components of the adhesive 14, for example hook-and-loop fasteners 15a, 15b, can be attached to one another.

[0095] Figure 6 shows a self-adhesive drainage foil 3 with adhesive 14, which can be wrapped around a tube 16 or a probe and thus used as a tubular drainage foil 3a. 7 shows a schematic view of the connection line 11, in particular the weld seam 6 between the first element 17 and the second element 18, e.g., between the first and second web-like elements or the first and second tubular elements. Detail A shows the tapering of the foil thickness due to the connection, in particular the welding operation. The foil is compressed in the region of the connection line 11, in particular at the weld seam 6. By compressing the double-walled drainage foil 3b in the region of the connection line 11 and the cutting foil angle, a shape-dependent angle α is generated between the ridge of the connection line 11 and the outer boundary surface 28 of the tubular drainage foil 3a.

[0096] The connecting lines 11 of the perforated drainage foil 3, such as the weld seam 6, can represent a critical point in terms of the foil's stability. To provide the tubular drainage foil 3a according to the invention with an open drainage space 20 having particularly good strength properties, the connecting lines 11, such as the weld seam 6, can be reinforced with additional material, in particular to improve the strength of the connecting lines 11. Figure 8 shows a schematic diagram of the attachment of a reinforcing element 29 to the drainage foil 3 comprising the first element 17 and the second element 18, for example by welding to the cutting foil 19. Non-perforated polyethylene foil can be used as additional material or as the reinforcing element 29. The foil layer can be made of polyethylene, so that an additional foil layer, such as a non-perforated polyethylene foil, can be particularly effectively welded to the drainage foil 3.

[0097] As a result of the additionally welded, in particular non-perforated, polyethylene foil, more material flows into the holes of the drainage foil 3, for example in the region of the connecting line 11, during welding, stabilizing said holes, so that excellent strength is achieved. Such a reinforcing element 29, e.g., polyethylene foil, significantly increases the tensile load of the weld seam 6. To attach the reinforcing element 29, the reinforcing element, e.g., additional polyethylene foil, is placed on top of the drainage foil 3 and then folded over. During connection, the reinforcing element 29 connects to the drainage foil 3 in the overlap region, e.g., by ultrasonic welding, resulting in the creation of a connecting line 11, and in particular a stable weld seam 6. Residual material 21 of the reinforcing element 29, e.g., residual polyethylene foil, can then be removed, e.g., manually or mechanically, in the region of the connecting line 11, and in particular the region of the weld seam 6. The reinforcing element 29, e.g., polyethylene foil, can be provided so that it is present only in the connecting line 11, and in particular the weld seam 6.

[0098] A tubular drainage foil 3a with an insertion aid 22 shown in Figure 9 simplifies the application of the drainage foil 3. As the insertion aid 22, various materials can be used, such as fabrics or plastics with low friction against plastics, for example micro-rough fabrics. The insertion aid 22 can be applied to the tube 16 (left side of Figure 9) or can be integrated directly into the drainage foil 3a or can also be included in the inner lumen of the tubular drainage foil 3a (right side of Figure 9). For example, the insertion aid 22 can be placed on a tube, e.g. a drainage tube or a probe (left side of Fig. 9). The tubular drainage foil 3a can have closed tube ends, e.g. when the tube 16 is covered with the tubular drainage foil 3a.

[0099] It has been found to be advantageous for some applications if such a closed tube end is provided with a predetermined break point 23. The predetermined break point 23 allows the insertion aid 22 to be removed by applying force. The insertion aid 22 may also be tubular with two open tube ends (right side in Fig. 9). With regard to the manufacturing technique, it has proven to be particularly advantageous if the insertion aid 22 is already integrated into the tubular drainage foil 3a during its manufacture. For easy handling of the insertion aid 22, it has proven preferable that the insertion aid 22 is longer than the tubular drainage foil 3a, so that the insertion aid 22 protrudes and can be grasped at the tube ends of the tubular drainage foil 3a. After the tubular drainage foil 3a or a tube covered by the tubular drainage foil 3a has been inserted into the wound area, the insertion aid 22 can be removed by simple pulling out.

[0100] 10 shows the step of rolling up the tubular drainage foil 3a to obtain a rolled-up tubular drainage foil 3a. A partially or completely rolled-up tubular drainage foil 3a has the advantage that it can be efficiently packaged in an environmentally friendly way, particularly by saving material. Furthermore, it has the advantage that the user can easily roll the tubular drainage foil 3a over a structure, for example a tube 16, in particular a drainage tube or a probe, and cover the structure with the tubular drainage foil 3a.

[0101] To roll up the tubular drainage foil 3a, a part of the tubular drainage foil 3a or the complete tubular drainage foil 3a can be rolled up starting from the tube opening at the tube end along the longitudinal tube axis 30. In particular, the tubular drainage foil 3a can be rolled up starting from the inner boundary surface in the direction of the outer boundary surface 28 along the longitudinal tube axis 30 to roll up a part of the tubular drainage foil 3a or the complete tubular drainage foil 3a.

[0102] Figure 11 shows a tubular drainage foil 3a with elastic material. The tubular drainage foil 3a can have, for example, an elastic foil 24 or an elastic seam 25, in particular a seam made of elastic material. By integrating an elastic material into the tubular drainage foil 3a, the elasticity of the tubular drainage foil 3a can be increased, especially if the double-walled drainage foil 3b used to form the tubular drainage foil 3a consists of a slightly expandable material. The tubular drainage foil 3a with elastic material can be formed by connecting the double-walled drainage foil 3b and the elastic material along the overlapping area of ​​the drainage foil 3b and the elastic material. By integrating an elastic material, e.g. a strip of elastic foil 24 or an elastic seam 25, the tubular drainage foil 3a can be particularly well expanded, which in turn makes it easier to apply, for example, to a drainage tube.

[0103] 12 shows a side view of a tubular drainage foil 3a whose edges have been reinforced by folding. This tubular drainage foil 3a can be formed with a reinforced region at one or both circumferential tube ends. From a production engineering perspective, it has proven particularly efficient if the reinforced region is formed by folding a portion of the tubular drainage foil 3a at the tube end, the folding being carried out in particular in such a way that the tubular element forming the inner boundary surface of the tubular drainage foil 3a forms the outer boundary surface 28 of the tubular drainage foil 3a in the reinforced region. The marked edge area 26 of the tube opening can be folded outwards, thus creating a double wall and reinforcing the edge of the tubular drainage foil 3a. The folded edge can be fixed at points, for example by a seam. Tearing of the tubular drainage foil 3a is effectively prevented by the reinforced edge.

[0104] 13 shows various embodiments of a tubular drainage foil 3a according to the invention. In particular, the tubular drainage 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 drainage foil 3a can also have tube openings 32 at both tube ends. The tubular drainage foil 3a may further have reinforcing elements 29, for example folded edges.

[0105] Figure 14 shows a side view of a tubular drainage foil 3a with a tube 16 which may be provided together in a wound care kit 34. Figure 15 shows a side view of a tubular drainage foil 3a with a tube 16 and an absorbent body 35 which may be provided together in a wound care kit 34. Figure 16 shows a side view of a drainage foil 3, for example a tubular drainage foil 3a, with a tube 16 and a connecting means 36, for example a circular application aid or clamp, which may be provided together in a wound care kit 34. [Explanation of symbols]

[0106] Code List 1 welding die 2 brackets 3 drainage foil 3a Tubular drainage foil 3b Double drainage foil 4 base 5 Cutting Elements 6 Welded seams 7. Foil residue 8. Ram 9 Sleeve 10 The side of the connecting line opposite the fold line, especially the fold line 11 Connecting wire 12 The side of the connecting line facing the fold line, especially the fold line 13 Corresponding Ram 14 Adhesive 15 hook and loop fastener 15a, 15b hook and loop fastener 16 tubes 17 First Element 18 Second Element 19 Cutting foil 20 Drainage space 21 Residual substances 22 Insertion aid 23 Predetermined Breaking Point 24 Elastic Foil 25 Elastic Seams 26 Edge area 27 Winding shaft 28 Outer boundary of tubular drainage foil 29 Reinforcing Elements 30 Tube shaft 31 Inner boundary surface of tubular drainage foil 32 Tube opening 33 Closed tube ends 34 Wound Care Kit 35 Absorbent 36 Connection Methods

Claims

1. 1. A method for manufacturing a double-walled drainage foil with open drainage spaces, comprising: i) providing a first web-like element and a second web-like element; ii) perforating the first and second web-like elements, so that at least one opening, preferably a plurality of openings, that allow the passage of body fluids, is formed in each of the first and second web-like elements; iii) placing the first web-like element on top of the second web-like element such that the first and second web-like elements are disposed substantially parallel to each other; iv) connecting the first web-like element and the second web-like element at at least one fastening area, in particular at least one point-like fastening area, preferably by ultrasonic welding, to obtain a double-walled drainage foil with an open drainage space formed between the first and second web-like elements.

2. 2. The method of claim 1, wherein the at least one opening allowing the passage of body fluids has a diameter 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.

3. 3. The method according to claim 1 or 2, wherein the first web-like element and the second web-like element are connected in step iv) by a multiplicity of fastening areas, preferably formed in a lattice arrangement, preferably with a distance in each case between adjacent fastening areas of at least 2 mm, preferably at least 3 mm, more preferably at least 5 mm.

4. The drainage foil is 30 g / m ２ ~90g / m ２ , preferably 40 g / m ２ ~80g / m ２ , more preferably 50 g / m ２ ~70g / m ２ 4. The method of claim 1, wherein the sheet has a basis weight in the range of

5. The drainage foil has a tensile strength of 7N / 25.4mm or more, a breaking elongation of 40% or more, and a thickness of 75m ３ / m ２ 5. The method of claim 1, wherein the adhesive has a porosity of 0.5 N / 25.4 mm or more and / or a bond strength of 0.5 N / 25.4 mm or more.

6. 6. The method according to claim 1, wherein at least one opening allowing the passage of body fluids has a round, circular and / or elliptical shape, in particular with respect to the plan view of the planar area of ​​the first or second web-like element.

7. 7. The method according to any one of claims 1 to 6, wherein the method comprises the step of attaching an adhesive, in particular a glue, adhesive material and / or a hook-and-loop fastener, in particular one or more barbs, to the drainage foil.

8. 8. The method of claim 1, wherein step ii) is performed before or after step iii) and / or step iv) is performed after step iii) and before or after step ii).

9. the method comprising the step of forming a three-dimensional structure, preferably a tubular structure, from the drainage foil; 9. The method according to claim 1, wherein the three-dimensional structure is preferably formed by welding, in particular ultrasonic welding or laser welding, by thermal bonding, in particular UV or hot air thermal bonding, by using adhesives, and / or by deep drawing, in particular by deep drawing the first and second web-like elements connected in step iv).

10. 10. The method of claim 1, wherein the drainage foil is tubular.

11. 1. A method for manufacturing a tubular drainage foil, comprising: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a drainage foil manufactured according to the method of any of claims 1 to 10; b) folding the drainage foil onto itself around a fold line, in particular a crease line, so that the drainage foil has overlapping areas which are connected to form the connecting line, preferably the drainage foil has a first edge and a second edge which extends substantially parallel to the first edge, and the drainage foil is folded or creased onto itself along the fold line or crease line, respectively, so that the drainage foil has overlapping areas along the first edge and the second edge which can be connected to the connecting line; c) connecting the drainage foil along the overlapping area to form a connecting line; d) obtaining a tubular drainage foil.

12. 1. A method for manufacturing a tubular drainage foil, comprising: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a drainage foil manufactured according to the method of any one of claims 1 to 10, and an elastic material; b) placing a first edge of the drainage foil on the elastic material such that an overlap area is formed between the first edge of the drainage foil and the elastic material, which can be connected to a connecting line; c) connecting the drainage foil and the elastic material along an overlapping area between the first edge of the drainage foil and the elastic material to form a connecting line; d) folding, in particular scoring, the drainage foil onto the elastic material along the fold line, in particular the crease line, so that an overlapping area connected to the connecting line is formed between a second edge of the drainage foil, preferably a second edge of the drainage foil extending substantially parallel to the first edge, and the elastic material; e) connecting the drainage foil and the elastic material along an overlapping area between the second edge of the drainage foil and the elastic material to form a connecting line; f) obtaining a tubular drainage foil.

13. 1. A method for manufacturing a tubular drainage foil, comprising: a) providing a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a drainage foil manufactured according to the method of any of claims 1 to 10; b) winding the drainage foil around a winding shaft so that the drainage foil has an overlapping area, the overlapping area being formed by winding around the winding shaft and capable of being connected to a connecting wire, the drainage foil being in at least two layers; c) connecting, preferably by adhesive or connecting means, the first and second layers of drainage foil present in the at least two layers in the overlapping area, preferably forming a connecting line; d) obtaining a tubular drainage foil.

14. 14. The method according to any one of claims 11 to 13, characterized in that the connecting step is performed by welding, in particular ultrasonic or laser welding, thermal bonding, in particular UV or hot air, adhesive, in particular glue or hook-and-loop fasteners, and / or connecting means, in particular clamps.

15. 15. The method of any of claims 11 to 14, wherein the joining step is performed by ultrasonic welding, preferably at a speed in the range of 0.1 to 5.0 m / min, a power in the range of 50 to 500 watts, and / or a pressure in the range of 5 N to 100 N.

16. 16. The method according to any one of claims 11 to 15, wherein the connecting step comprises the steps of placing the drainage foil in an ultrasonic welding device and welding the drainage foil, in particular by means of a welding die, for example an L-shaped welding die, to form a tubular drainage foil.

17. 17. The method according to any one of claims 11 or 12 and 14 to 16, wherein the joining step is carried out by ultrasonic welding using a cutting wheel with a cutting radius of 0.2 mm or less and / or using a cutting wheel with a grinding angle facing the fold, in particular the fold line, of 15° or less and / or using a cutting wheel with a grinding angle facing away from the fold, in particular the fold line, of 75° or less.

18. 18. A method according to any one of claims 11 or 12 and 14 to 17, wherein the fold of the connecting line, in particular the edge strip of the drainage foil arranged opposite the fold line, is removed during or after the connection, in particular by punching.

19. 19. The method according to any one of claims 11 to 18, wherein the connecting line, preferably the welded seam, has a width along the circumferential direction of the tubular drainage foil of less than 2 mm, preferably less than 1 mm, more preferably less than 0.5 mm.

20. 20. The method according to any one of claims 11 to 19, wherein the connecting line, preferably the welded seam, has a thickness along the radial direction of the tubular drainage foil of less than 1 mm, preferably less than 750 μm, more preferably less than 450 μm.

21. 21. The method according to any one of claims 11 to 20, further comprising a step of 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 overlap region before the connecting step.

22. 22. The method according to claim 21, wherein the reinforcing element is a foil, preferably a polyethylene foil.

23. the tubular drainage foil is formed circumferentially on at least one tube end having a reinforced region, the drainage foil being present in at least two layers; 23. A method according to any one of claims 11 to 22, wherein the reinforced region is preferably formed by folding a portion of the tubular drainage foil at the tube end, the folding being carried out in particular so that the tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drainage foil in the reinforced region.

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

25. 25. A method according to any one of claims 11 or 12 and 14 to 24, wherein after connection the side of the connection line facing the fold line, in particular the fold line, is rotated completely outwards by inverting the tubular drainage foil.

26. 26. The method according to any one of claims 11 to 25, wherein the drainage foil provided in step a) is a drainage foil manufactured according to any one of claims 1 to 10.

27. a tubular drainage foil having 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, said second tubular element being connected to said first tubular element by at least one fastening region, A tubular drainage foil, characterized in that the first tubular element and the second tubular element each have at least one opening that allows the passage of body fluids, and an open drainage space is formed between the outer boundary surface and the inner boundary surface.

28. 28. A tubular drainage foil according to claim 27, wherein the first tubular element and / or the second tubular element are plastic foils, preferably comprising polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactide and / or cellulose.

29. 29. A tubular drainage foil according to claim 27 or 28, wherein the first tubular element and the second tubular element are connected by a multiplicity of fastening areas, preferably formed in a grid array, and preferably the distance between adjacent fastening areas is at least 2 mm, preferably at least 3 mm, more preferably at least 5 mm.

30. 30. A tubular drainage foil as claimed in any one of claims 27 to 29, wherein the tubular drainage foil has a connecting line, preferably a welded seam, connecting the first tubular element and the second tubular element and / or the first tubular element and / or the second tubular element and elastic material.

31. 31. A tubular drainage foil according to claim 30, wherein the connecting lines have a width along the circumference of the tubular drainage foil of less than 2 mm, preferably less than 1 mm, more preferably less than 0.5 mm.

32. 32. A tubular drainage foil according to claim 30 or 31, wherein the connecting lines have a thickness along the radial direction of the tubular drainage foil of 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less.

33. The tubular drainage foil has a thickness of 10 g / m ２ ~200g / m ２ , preferably 40 g / m ２ ~80g / m ２ , more preferably 50 g / m ２ ~70g / m ２ 33. A tubular drainage foil according to any one of claims 27 to 32, having a basis weight of

34. The tubular drainage foil has a tensile strength of 7N / 25.4mm or more, a breaking elongation of 40% or more, and a thickness of 75m ３ / m ２ 34. A tubular drainage foil according to any one of claims 27 to 33, having a porosity of at least 0.5 N / 25.4 mm and / or a bond strength of at least 0.5 N / 25.4 mm.

35. 35. A tubular drainage foil according to any one of claims 27 to 34, wherein 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 no tube opening at another tube end.

36. 36. A tubular drainage foil according to any one of claims 27 to 35, wherein the tubular drainage foil comprises a reinforcing element, in particular a reinforcing strip or reinforcing foil, at at least one tube end and / or along the connecting line.

37. 37. A tubular drainage foil according to any one of claims 27 to 36, wherein the tubular drainage foil has a reinforced region at at least one tube end, the reinforced region preferably being formed in the form of a two-layer edge formed by folding a part of the tubular drainage foil at the tube end, the folding being carried out in particular so that the second tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drainage foil, in particular the outer boundary surface of the reinforced region of the tubular drainage foil, in the reinforced region.

38. 38. A tubular drainage foil according to any one of claims 27 to 37, wherein the outer boundary surface, the inner boundary surface and / or the inner lumen of the tubular drainage foil formed by the inner boundary surface are provided with a sliding aid and / or an insertion aid.

39. 39. A tubular drainage foil according to claim 38, wherein the sliding aid comprises an aqueous lubricant, a glycerol-based lubricant, a polymer gel, in particular an antiallergic polymer gel, an endoscopy lubricant, in particular an endoscopy sliding gel, and / or an aqueous solution, in particular a sodium chloride solution.

40. 40. A tubular drainage foil according to claim 38 or 39, wherein the insertion aid comprises fabric and / or plastic and / or the insertion aid is a tubular insertion aid arranged within an inner lumen of the tubular drainage foil.

41. 41. A tubular drainage foil according to any of claims 27 to 40, wherein the tubular drainage foil has a length in the range of 0.5 cm to 40 cm, preferably 2 cm to 30 cm, more preferably 5 cm to 20 cm.

42. 42. A tubular drainage foil according to any of claims 27 to 41, wherein the tubular drainage foil has an outer diameter in the range of 1 mm to 60 mm, preferably 2 mm to 50 mm, more preferably 4 mm to 30 mm.

43. A tubular drainage foil produced 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 further component selected from an absorbent body, a tube, a wire, a stent and an insertion aid, Preferably, a wound care kit, characterized in that at least one part of the at least one further component is arranged within the inner lumen of the tubular drainage foil defined by the inner boundary surface.

44. 44. A wound care kit according to claim 43, wherein the absorbent material is a sponge, a foam, in particular a polyurethane or polyvinyl alcohol foam, or gauze.

45. 45. The wound care kit of claim 43 or 44, wherein the tube is a drainage tube.

46. 46. ​​A wound care kit according to any one of claims 43 to 45, wherein the wound care kit has a length in the range of 0.5 cm to 250 cm, preferably 10 cm to 200 cm.

47. 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 for use in wound care.

48. A method for caring for a wound, comprising contacting 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 with a wound on a patient.

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