Methods for preparing drainage foil, tubular drainage foil, and wound care kits

Abstract

This invention provides a method for preparing a double-walled drainage foil with an open drainage space. The method includes the following steps: i) providing a first mesh element and a second mesh element; ii) perforating the first mesh element and the second mesh element, wherein at least one opening allowing body fluid to pass through is formed in each of the first mesh element and the second mesh element, preferably forming multiple openings allowing body fluid to pass through; iii) arranging the first mesh element on the second mesh element such that the first mesh element and the second mesh element are arranged substantially parallel to each other; iv) connecting the first mesh element and the second mesh element in at least one fastening area, particularly at least one point fastening area, preferably by ultrasonic welding, to obtain a double-walled drainage foil forming an open drainage space between the first mesh element and the second mesh element.

Description

Technical Field

[0001] This invention relates to a method for preparing a double-walled drainage foil with an open drainage space and a method for preparing a tubular drainage foil. The invention also relates to tubular drainage foils, wound care kits, and the application of tubular drainage foils or wound care kits in wound care. Furthermore, the invention relates to a method for wound care. Background Technology

[0002] Drainage foil is required in various types of clinical imaging or trauma, particularly during or after abdominal, thoracic, or pelvic surgeries, for example, if temporary coverage of an open wound and / or drainage of fluid from the wound area is necessary. For instance, if multiple daily interventions are required, covering an open wound may be necessary to facilitate rapid access to internal organs and reduce the adverse effects of exudate formation in the wound area. Mortality can be significantly reduced in certain indications through temporary coverage. Furthermore, fluid aspiration may be necessary to promote wound healing, especially postoperative drainage, as fluid accumulation such as blood or wound secretions can disrupt the healing process.

[0003] Essentially, from a medical perspective, there are two main requirements for drainage foils suitable for the stated purposes. First, good exudate management of the wound area must be achieved, especially when used in open abdominal, thoracic, or pelvic cavities, i.e., aspirating fluids from the entire wound area. Secondly, friction between the drainage foil and the wound or surrounding organs should be minimized, while adequately protecting the wound from environmental influences. Furthermore, it must be ensured that no contaminants enter the open wound or the patient's body through the drainage foil.

[0004] EP 0261167B1 describes a liquid-permeable wound dressing provided for direct contact with a wound substrate and having a hydrophobic layer to prevent adhesion of the wound dressing to the wound area and any resulting contamination of the wound. However, using the wound dressing described in this application does not provide satisfactory exudate management in the wound area.

[0005] To improve exudate management in wound areas, US Patent 7381859B2 discloses a wound dressing in which an exudate-absorbing foam layer is contained between two liquid-permeable foil-like mesh elements, which may be in the form of a plastic film. However, the wound dressing known in this application has proven problematic, as satisfactory exudate aspiration cannot be achieved at the edges of the wound dressing, resulting in wound care complications in these areas.

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

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

[0008] In view of the aforementioned problems in the prior art, the object of the present invention is to provide a drainage foil that enables effective exudate management throughout the wound area, particularly in the case of complex wounds, such as surgical wounds of internal organs and / or locomotor apparatus, without contaminating the wound. Furthermore, the object of the present invention is to provide an improved method for preparing the drainage foil.

[0009] Method for preparing double-walled drainage foil

[0010] According to the present invention, this objective is achieved by a method for preparing a double-walled drainage foil with an open drainage space. The method includes the following steps:

[0011] i) Provide a first mesh element and a second mesh element;

[0012] ii) Perforating the first mesh element and the second mesh element, wherein at least one opening for allowing body fluid to pass through is formed in each of the first mesh element and the second mesh element, preferably multiple openings for allowing body fluid to pass through are formed; iii) Arranging the first mesh element on the second mesh element such that the first mesh element and the second mesh element are arranged substantially parallel to each other.

[0013] iv) In at least one fastening area, particularly at least one point fastening area, the first mesh element and the second mesh element are connected, preferably by ultrasonic welding, to obtain a double-walled drainage foil that forms an open drainage space between the first mesh element and the second mesh element.

[0014] In the method according to the invention, an open drainage space is formed by connecting a first mesh element and a second mesh element and perforating the mesh elements. This drainage space allows capillary action between the individual mesh elements, thereby preventing the leakage of bodily fluids, particularly exudates, from the drainage space. Furthermore, the bodily fluids can be distributed throughout the drainage area without requiring additional measures absolutely necessary for this purpose, such as providing additional absorbents. In this way, good exudate management can be achieved throughout the wound area because there are no marginal areas lacking capillary function, which would adversely affect exudate management. The method according to the invention makes it possible to prepare a drainage foil that can be cut to any size or structure of the wound, even for intracavitary application, without problem, and further ensures the required drainage function throughout the wound area. In this case, the method may include a drainage foil configured with a smooth surface to prevent adhesion of tissue and cells to the wound substrate or, in the case of surrounding organs. Furthermore, the method may include promoting the entry of bodily fluids into the drainage space of the drainage foil by the mesh elements themselves formed of a liquid-permeable material.

[0015] In this case, if at least one opening allowing bodily fluid to pass through is formed by a channel extending from the first or second mesh element in the direction of another mesh element and into the drainage space, the stability of the drainage foil prepared by the method according to the invention can be improved, wherein the channel wall is integrally formed with the corresponding mesh element by perforating the mesh element.

[0016] In the embodiment described last of the invention, if the opening or channel is configured such that its cross-sectional area decreases in a plane extending perpendicularly to the depth direction of the drainage foil, starting from one mesh element and proceeding along the direction of another, exudate management can be particularly improved, especially to achieve capillary action that promotes the entry of bodily fluids into the drainage space. This, on the one hand, helps remove exudate from the wound area, and on the other hand, prevents backflow from the drainage space into the wound area.

[0017] Within the scope of this invention, it has proven particularly advantageous for effective exudate management if the diameter of at least one opening allowing bodily fluids to pass through is in the range of 100 μm to 2000 μm, preferably in the range of 300 μm to 700 μm, and more preferably in the range of 400 μm to 600 μm. It has been found that excellent capillary action can be achieved through at least one, preferably multiple, openings allowing bodily fluids to pass through and having such diameters.

[0018] Furthermore, it has been found that if the first and second mesh elements are connected at multiple fastening regions, preferably at multiple fastening regions formed in a grid arrangement, particularly good exudate management and particularly good drainage foil stability can be ensured. In terms of the excellent suction capacity of the drainage foil, in each case, the distance between adjacent fastening regions is preferably 2 mm or more, preferably 3 mm or more, and more preferably 5 mm or more. For example, multiple fastening regions can be arranged in a rectangular grid. The arrangement of the rectangular grid can be particularly effective in preparing the drainage foil.

[0019] Mesh elements can be connected while ensuring drainage space through multiple point-like fastening areas (preferably formed in a mesh arrangement). The connection can be achieved by welding, bonding, or other types of fastening. However, such connection should not impede the removal of exudate but should be auxiliary. It has been found that ultrasonic welding not only produces drainage foils more efficiently than other methods for connecting mesh elements but also produces particularly stable drainage foils that maintain structural integrity even under mechanical loads, such as in intracavitary applications. In particular, it has been found that ultrasonic welding allows for the production of particularly durable drainage foils and can achieve particularly advantageous bond strengths of 0.5 N / 25.4 mm or higher.

[0020] If the area of ​​each fastening region in the cross-section extending vertically to the depth direction is 5mm² 2 Or smaller, especially 3mm 2 Or smaller, preferably 2mm 2 It is advantageous if the distance between the fastening areas or the grid points of the fastening area formed by the grid arrangement is 2 mm or more, especially 3 mm or more, and particularly preferably 5 mm or more.

[0021] Regardless of whether the fastening is performed by welding, bonding, or other types of connection, material bridges connecting the inner boundary surfaces of the mesh elements to each other can be formed in the fastening area. It has been found that such material bridges, which promote the overall structural stability of the drainage foil, can be prepared with particular precision by ultrasonic welding. To obtain the desired capillary action in the drainage space, the distance between the inner boundary surfaces of the mesh elements is 5 mm or less, preferably 4 mm or less, and particularly preferably 2 mm or less. In this case, if the distance between the inner boundary surfaces of the mesh elements is 0.05 mm or longer, particularly 0.1 mm or longer, and especially preferably 0.3 mm or longer, it can be ensured that the exudate is distributed capillarily over the entire area of ​​the drainage foil in the drainage space. For the preparation of a high-quality drainage foil, it has proven particularly advantageous if the connection between the first and second mesh elements is performed by ultrasonic welding, because in this way, the desired distance between the first and second mesh elements, particularly the distance between the inner boundary surfaces of the drainage space formed by the first mesh element and the drainage space formed by the second mesh element, can be produced precisely and with guaranteed quality. It has been found that preparing drainage foil by ultrasonic welding yields higher quality drainage foil than simply ensuring the distance between the inner boundary surfaces by the depth of the funnel-shaped opening, in particular, because perforation is usually performed with limited precision.

[0022] For the use of drainage foil in wound care, if the basis weight of the drainage foil is 30 g / m³, 2 Up to 90g / m 2 Within the range, 40g / m 2 Up to 80g / m 2 More preferably 50g / m 2 Up to 70g / m 2This proves particularly advantageous. The first and / or second mesh elements may comprise or be plastic foil, wherein the plastic foil preferably comprises polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid, and / or cellulose. This type of plastic foil has the advantage of effectively preventing the penetration of pathogens (such as bacteria) and the adhesion and inward growth of tissues. The plastic foil may particularly comprise polyethylene, preferably low-density polyethylene (LDPE). It has been found that mesh elements or plastic foils comprising polyethylene, particularly low-density polyethylene (LDPE), are particularly advantageous in the preparation and use of the drainage foil according to the invention. The first and / or second mesh elements may comprise polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid, and / or cellulose, preferably polyethylene, more preferably low-density polyethylene (LDPE). The structure of the mesh element can be prepared by a nonwoven fabric production process. In this context, synthetic fibers and natural fibers (such as silk and cotton), as well as inorganic fibers (such as glass and ceramics) or metals (silver fibers), can all be used to prepare nonwoven fabrics or tissues. Within the scope of this invention, it is further envisioned that the mesh element be equipped with an antibacterial or bacteriostatic layer on one or both sides. For example, the antibacterial or bacteriostatic effect can be achieved using PHMB, silver, chlorhexidine, etc. Regarding the tendency to prevent the drainage foil prepared according to the method of this invention from sticking together, at least one mesh element can have a hydrophilic or hydrophobic surface. Furthermore, the application of expandable materials is also envisioned.

[0023] Regarding the use of the drainage foil prepared by the method of the present invention in wound care, if the tensile strength of the drainage foil is 7 N / 25.4 mm or higher, the elongation at break is 40% or greater, and the porosity is 75 μm... 3 / m 2 Tensile strength of 0.5 N / 25.4 mm or higher has proven particularly advantageous. This ensures effective exudate management while maintaining the structural integrity of the drainage foil. Tensile strength is preferably measured according to DIN EN ISO 527. For example, the tensile strength of the drainage foil measured according to DIN EN ISO 527 can reach 7 N / 25.4 mm or higher. Elongation at break is preferably measured according to DIN EN ISO 527. For example, the elongation at break of the drainage foil measured according to DIN EN ISO 527 can reach 40% or higher. Bond strength is preferably measured according to Edana NWSP 401.0.R0. For example, the bond strength of the drainage foil measured based on or according to Edana NWSP 401.0R0 is 0.5 N / 25.4 mm or higher. Porosity is a measure of the ratio of the cavity volume to the total volume of the drainage foil.

[0024] In the case of a drainage foil prepared by the method according to the invention, at least one opening allowing bodily fluid to pass through, particularly in a planar view relative to the planar extent of the first or second mesh element, may be circular, annular, and / or elliptical. This shape allows bodily fluid to effectively enter the open drainage space of the drainage foil from the wound area.

[0025] In the case of a drainage foil prepared by the method according to the invention, if at least one mesh element, preferably two mesh elements, has a plurality of openings preferably arranged in a grid shape, particularly in a rectangular grid (where the distance between adjacent openings or grid points of the mesh elements is 15 mm or less, preferably 5 mm or less, particularly 3 mm or less), the desired removal of exudate can be achieved while ensuring satisfactory overall stability of the drainage foil. Regarding the desired overall stability of the drainage foil prepared by the method according to the invention, it is further demonstrated that it is particularly advantageous if the opening of one of the mesh elements is configured in the projection between the openings of an opening in another mesh element along the depth direction. To prevent the overall structure of the drainage foil from collapsing, particularly when negative pressure is applied, it proves particularly advantageous if at least one channel-shaped opening is formed in the mesh element, preferably a plurality of such channels, extending in the depth direction beyond 50% or more of the total depth of the drainage space.

[0026] To ensure the desired permeability of the mesh element, perforation should be performed such that the mouth area of ​​each opening facing the drainage space is 0.1 mm in a plane extending perpendicular to the depth direction. 2 Or larger, especially 0.5mm 2 Or larger, preferably 1mm 2 If the perforation is performed in this manner, the resulting opening area of ​​the drainage foil will be 5 mm². 2 Or smaller, especially 4mm 2 Or smaller, preferably 3mm 2 Or smaller, so that the desired capillary action can be achieved while preventing fluid from flowing back from the drainage space to the wound area.

[0027] As described above, the openings in the channels forming the mesh element are formed by perforations in the mesh element. In this case, in order to obtain a smooth surface that can effectively inhibit tissue or cell adhesion to the wound base or surrounding organs, it proves advantageous if the channel wall has an arcuate design at least in a portion of the cross-section extending parallel to the depth direction and continuously merges into the boundary region of the mesh element.

[0028] The method according to the invention may include attaching an adhesive, particularly glue, bonding material, and / or hook and loop fasteners, particularly one or more barbs, to a drainage foil. Such adhesives, bonding materials, or hook and loop fasteners enable the prepared drainage foil to be secured to other structures, such as body parts, surgical devices, absorbents, tubes, sutures, stents, insertion aids, and / or negative pressure therapy devices. For example, the method may include securing adhesives, bonding materials, and / or hook and loop fasteners to two opposite edges of the drainage foil. This drainage foil can then be used to wrap structures, such as those selected from absorbents, tubes, sutures, stents, insertion aids, and negative pressure therapy devices, and to secure the drainage foil to the structure by connecting the two opposite edges with adhesives, bonding materials, or hook and loop fasteners.

[0029] In terms of preparation techniques, it has proven particularly advantageous if step ii) is performed before or after step iii), and / or step iv) is performed after step iii) and before or before step ii).

[0030] The method according to the invention may further include forming a three-dimensional structure, preferably a tubular structure, from the drainage foil. The advantage of such three-dimensional structures (e.g., tubular structures) is that they can be used for more complex wounds, such as deep wounds, or deep regions of the body. In particular, such three-dimensional structures, such as tubular structures, can even be used intracavitarily, for example, in the gastrointestinal tract or fistulas. The drainage foil can be tubular, for example, for intracavitary use and / or for accommodating drainage tubes.

[0031] In terms of fabrication techniques, it has proven particularly advantageous if such a three-dimensional structure is formed by welding, especially ultrasonic welding or laser welding, by thermal bonding, especially by ultraviolet light or hot air, using adhesives and / or by deep drawing, especially by deep drawing, connecting the first and second mesh elements in step iv).

[0032] Method for preparing tubular drainage foil

[0033] The object of the present invention is also achieved by a method for preparing a tubular drainage foil according to the present invention. The method includes the following steps:

[0034] a) Provide a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a double-walled drainage foil prepared by the method for preparing a double-walled drainage foil according to the present invention;

[0035] b) Fold the drainage foil downwards around the fold line, particularly the crease line, particularly crease it to itself, so that the drainage foil has an overlapping area that can be connected to the connecting line; wherein, preferably, the drainage foil has a first edge and a second edge extending substantially parallel to the first edge, and the drainage foil is folded or creaseed to itself along the fold line, particularly the crease line, so that the drainage foil has an overlapping area that can be connected to the connecting line along the first edge and the second edge.

[0036] c) Connect the drainage foil along the overlapping area, forming a connecting line;

[0037] d) Obtain tubular drainage foil.

[0038] Furthermore, the object of the present invention is achieved by a method for preparing a tubular drainage foil according to the present invention. The method includes the following steps:

[0039] a) Provide a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a double-walled drainage foil prepared by the method for preparing a double-walled drainage foil according to the present invention;

[0040] b) Arrange the first edge of the drainage foil on the elastic material such that an overlapping area that can be connected to the connecting line is formed between the first edge of the drainage foil and the elastic material;

[0041] c) Connect the drainage foil and the elastic material along the overlapping area between the first edge of the drainage foil and the elastic material, wherein a connecting line is formed;

[0042] d) Fold or crease the drainage foil downward relative to the fold line, particularly the crease line, into the elastic material, such that an overlapping area that can be connected to the connecting line is formed between the second edge of the drainage foil (preferably, the second edge of the drainage foil extending substantially parallel to the first edge) and the elastic material;

[0043] e) Connect the drainage foil and the elastic material along the overlapping area between the second edge of the drainage foil and the elastic material, wherein a connecting line is formed;

[0044] f) Obtain tubular drainage foil.

[0045] The object of the present invention is also achieved by a method for preparing a tubular drainage foil according to the present invention. The method includes the following steps:

[0046] a) Provide a drainage foil, preferably a double-walled drainage foil with an open drainage space, more preferably a double-walled drainage foil prepared by the method for preparing a double-walled drainage foil according to the present invention;

[0047] b) The drainage foil is wound around a winding shaft in such a way that the drainage foil has an overlapping area formed by the winding around the winding shaft and can be connected to a connecting wire, wherein the drainage foil exists in at least two layers;

[0048] c) Connecting the first and second layers of the drainage foil in at least two layers existing in the overlapping area, preferably by an adhesive or connecting device; wherein, preferably, a connecting line is formed;

[0049] d) Obtain tubular drainage foil.

[0050] It has been found that the methods described above for preparing tubular drainage foil according to the present invention effectively provide tubular drainage foils that achieve uniform drainage performance even in complex wound areas, such as wounds deep in the body. The following statements relate to all three methods described above for preparing tubular drainage foils according to the present invention. Each of the above methods for preparing tubular drainage foils may have the following characteristics.

[0051] In terms of manufacturing techniques, it has proven particularly advantageous if the connection is achieved by welding, especially ultrasonic welding or laser welding, by thermal bonding, especially by ultraviolet light or hot air, by adhesives, especially glue or hook-and-loop fasteners, and / or by connecting devices, especially clamps. Specifically, the connection of the drainage foil along the overlapping area, the connection of the drainage foil and the elastic material along the overlapping area between the first edge of the drainage foil and the elastic material, the connection of the drainage foil and the elastic material along the overlapping area between the second edge of the drainage foil and the elastic material, and the connection of the first and second layers of the drainage foil existing in at least two layers in the overlapping area, can be achieved by welding, especially ultrasonic welding or laser welding, by thermal bonding, especially by ultraviolet light or hot air, by adhesives, especially glue or hook-and-loop fasteners, and / or by connecting devices, especially clamps.

[0052] The connecting device can be, for example, a clamp, cord, thread, seam (e.g., an elastic seam or a seam made of elastic material), or a ring-shaped application aid. For example, the drainage foil can be wound onto a winding spool, particularly onto a drainage tube, and then secured as a tubular drainage foil by a connecting device (e.g., a clamp or a ring-shaped application aid). Overlapping areas, such as the overlap between the first and second edges of a double-walled drainage foil, can be connected by an elastic seam. The elastic seam increases the expandability of the tubular drainage foil.

[0053] If the connection is achieved by ultrasonic welding, preferably at a speed in the range of 0.1 m / min to 5.0 m / min, a power in the range of 50 W to 500 W, and / or a pressure in the range of 5 N to 100 N, the prepared tubular drainage foil has particularly advantageous properties for medical applications. This connection allows for stable connecting wires, ensuring high tensile strength even under mechanical loads.

[0054] The connections in the method for preparing tubular drainage foil according to the present invention, particularly the connections of the drainage foil along overlapping regions, the connections of the drainage foil and the elastic material along overlapping regions between the first edge of the drainage foil and the elastic material, the connections of the drainage foil and the elastic material along overlapping regions between the second edge of the drainage foil and the elastic material, and / or the connections of the first and second layers of the drainage foil existing in at least two layers in the overlapping regions, may include arranging the drainage foil in an ultrasonic welding apparatus and welding the drainage foil, particularly by means of a welding mold, such as an L-shaped welding mold, to form a tubular drainage foil. It has been found that tubular drainage foils with corresponding welding molds can be prepared efficiently and with high quality.

[0055] Furthermore, it was found that if the connection is achieved through ultrasonic welding using a cutting wheel with a cutting edge radius of 0.2 mm or less, and / or using a cutting wheel with a grinding angle of 15° or less facing the fold line, particularly the crease line, and / or a grinding angle of 75° or less away from the fold line, particularly the crease line, the performance of the cutting edge is particularly suitable for the function of the drainage foil. Therefore, it is possible to prevent material residues that could impair the function of the drainage foil from remaining on the cutting edge.

[0056] Joining can be achieved through welding, particularly ultrasonic welding. For example, by heating the material in the overlapping area, such as double-walled draining foil and / or elastic material, and then melting it through ultrasonic sonotrode vibrations induced by a generator. To create the weld, a cutting wheel, such as one capable of both welding and cutting simultaneously, can be used. This cutting wheel creates the weld during the welding process while removing excess material. Conventional cutting wheels can also be used to form the join line. For example, ultrasonic welding can be performed using a Nucleus Rotosonic DX1-TC 12 flatbed ultrasonic welding device, with an ultrasonic frequency of approximately 35 kHz.

[0057] To provide the smoothest possible connection line, and especially to prevent any functional damage to the tubular drainage foil due to a rough connection line, the edge strip of the drainage foil located on the side of the connection line opposite to the fold line, particularly the crease line, can be removed during or after connection, particularly by stamping. Furthermore, stamping can be used to remove unwanted residual material.

[0058] It has been found that the function of the tubular drainage foil is particularly advantageous if the method is carried out in such a way that the width of the connecting line (e.g., weld) along the circumferential direction of the tubular drainage foil is 2 mm or less, preferably 1 mm or less, more preferably 0.5 mm or less. To prevent any functional impairment of the product, it is particularly advantageous to provide the narrowest possible connecting line, especially the weld. Furthermore, it has proven particularly advantageous to ensure the function of the entire tubular structure if the thickness of the connecting line along the radial or depth direction of the tubular drainage foil, particularly perpendicular to the tube axis, is 1 mm or less, preferably 750 μm or less, more preferably 450 μm or less. In the method of preparing the tubular drainage foil according to the invention, the material can be melted in the overlapping area, particularly at the connecting line, thereby forming a material bridge, for example, if the connection is made by welding, particularly ultrasonic welding.

[0059] According to the invention, a method for increasing the stability of the drainage foil may include attaching a reinforcing element, particularly a reinforcing strip or reinforcing foil, to the region of the connecting line and / or at least one end of the tube, preferably by arranging the reinforcing element in the overlapping region before connection. For example, a reinforcing strip may be provided by double-layering the drainage foil in the region to be reinforced or by fixing a reinforcing material (e.g., polyethylene foil) to the region to be reinforced. It has been found that foil, particularly polyethylene foil, has a particularly advantageous reinforcing effect as a reinforcing element.

[0060] For example, during the joining process, by arranging reinforcing elements in the overlapping area before joining, the reinforcing elements can be co-welded to improve the tear strength of the drainage foil, particularly at the joining line. The reinforcing element not only has the advantage of increasing the tear strength of the drainage foil but also provides other advantages, such as being implemented as an X-ray-contrast-capable reinforcing element. For example, this allows for the precise placement of the tubular drainage foil onto the target structure under the control of X-ray imaging.

[0061] The excellent structural integrity of the tubular drainage foil can be further enhanced if a reinforcing region is formed at at least one end of the tubular foil in the circumferential direction, and the drainage foil exists in the reinforcing region in the form of at least two layers. This is particularly advantageous for applications where auxiliary tools (e.g., absorbents, tubes, filaments, supports, or insertion aids) are inserted into the tubular drainage foil, such as during surgical procedures or in the preparation of wound care kits. The tube opening is further stabilized by the reinforcing region, allowing any desired auxiliary tool to be inserted into the tubular drainage foil without the risk of tearing the foil. In terms of fabrication techniques, it has proven advantageous to form the reinforcing region by folding down a portion of the tubular drainage foil at the end, particularly the edge region of the tubular drainage foil, wherein the downward folding is particularly carried out in such a manner that the tubular element forming the inner boundary surface of the tubular drainage foil forms the outer boundary surface of the tubular drainage foil in the reinforcing region. The method may also include securing the downwardly folded portion of the tubular drainage foil, for example, by point fixation, particularly by welding, thermal bonding, adhesives, and / or connecting devices. "Downward folding" refers to any shape, arrangement, bending, winding, or folding of the drainage foil, in which overlapping areas can be achieved, particularly overlapping areas that can be connected to connecting lines, and / or reinforcing areas with drainage foil.

[0062] The method for preparing a tubular drainage foil according to the present invention may include rolling up at least a portion of the tubular drainage foil along a longitudinal tube axis, starting from the tube opening at the tube end, particularly rolling it along the longitudinal tube axis from the inner boundary surface towards the outer boundary surface. The tubular drainage foil may be partially or completely rolled up. It has been found that the application of rolled-up tubular drainage foil is simplified compared to unrolled drainage foil, because the user can effortlessly roll the tubular drainage foil onto structures, such as drainage tubes or probes, to wrap them with the tubular drainage foil.

[0063] Even with regard to the smooth surface of the connector on the outer side of the tubular drainage foil, it has proven advantageous to rotate the connector completely outwards towards the fold line, particularly the crease line, after connection by flipping the tubular drainage foil. The smooth surface on the outer side of the connector ensures high functionality of the tubular drainage foil within the connector area.

[0064] To achieve a particularly good drainage effect using the prepared tubular drainage foil, the drainage foil provided in step a) of the method for preparing the tubular drainage foil according to the present invention can be a drainage foil prepared according to the method for preparing a double-walled drainage foil according to the present invention. The structure of the prepared drainage foil, aided by a fastening region, prevents the collapse of the open drainage space between the two layers. Therefore, it ensures the absorption distribution throughout the entire area up to the edge region of the tubular drainage foil, and the drainage foil effectively removes exudate.

[0065] tubular drainage foil

[0066] According to the invention, the object of the invention is also achieved by a tubular drainage foil having a first tubular element forming an outer boundary surface and a second tubular element forming an inner boundary surface opposite to the outer boundary surface, the second tubular element being connected to the first tubular element by at least one fastening region, wherein each of the first and second tubular elements includes at least one opening allowing bodily fluids to pass through, and an open drainage space is formed between the outer boundary surface and the inner boundary surface. In the tubular drainage foil according to the invention, capillary action is achieved between the two tubular elements through the open drainage space, which allows bodily fluids, particularly exudates, to flow out or be aspirated throughout the tubular structure. The tubular drainage foil according to the invention can ensure effective exudate management for more complex wounds, such as wounds located deep inside the body, especially in cases of endocavitary application. An advantage of the tubular drainage foil according to the invention is that it can be used not only on the wound surface but also arranged between organ structures to effectively aspirate bodily fluids, such as exudates.

[0067] The first and / or second tubular element may comprise or be a plastic foil, wherein the plastic foil preferably comprises polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid, and / or cellulose. This type of plastic foil has the advantage of effectively preventing the penetration of pathogens (such as bacteria) and the adhesion and inward growth of tissues. The plastic foil may particularly comprise polyethylene, preferably low-density polyethylene (LDPE). It has been found that tubular elements or plastic foils containing polyethylene, especially low-density polyethylene (LDPE), are particularly advantageous for the preparation and use of the tubular drainage foil according to the invention. The first and / or second tubular element may comprise polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid, and / or cellulose, preferably polyethylene, more preferably low-density polyethylene (LDPE). Within the scope of the invention, it is also contemplated that the tubular element be provided with an antimicrobial material or antimicrobial layer on one or both sides. Antimicrobial or antimicrobial effects can be achieved by PHMB, silver, chlorhexidine, etc. To avoid the tendency of the drainage foils prepared by the method of the present invention to stick together, at least one tubular element may have a hydrophilic or hydrophobic surface. Furthermore, the application of expandable materials is also envisioned.

[0068] Regarding the structural integrity of the tubular drainage foil, it proves advantageous if the first and second tubular elements are connected in multiple fastening regions, preferably in multiple fastening regions formed in a grid arrangement. To ensure good capillary action in the open drainage space formed between the first and second tubular elements, the distance between adjacent fastening regions is preferably 2 mm or more, preferably 3 mm or more, and more preferably 5 mm or more. For example, the variety of fastening regions can be arranged in a rectangular grid.

[0069] Furthermore, for effective capillary action, if the area of ​​the cross-section extending in the perpendicular radial direction or depth direction of each fastening region is 5 mm². 2 Or smaller, especially 3mm 2 Or smaller, preferably 2mm 2 Or smaller, has proven advantageous. The depth direction is particularly perpendicular to the direction extending from the boundary surface. The radial direction is particularly perpendicular to the longitudinal tube axis.

[0070] Regardless of whether the fastening of the fastening area is performed by welding, such as ultrasonic welding, adhesive bonding, or other types of connection, material bridges connecting the tubular elements to each other can be formed in the fastening area. It has been found that ultrasonic welding can produce such material bridges, which promote the overall structural stability of the tubular drainage foil, with particular precision. To obtain the desired capillary action in the drainage space, the distance between the inner boundary surfaces of the tubular elements defining the open drainage space is 5 mm or less, preferably 4 mm or less, and particularly preferably 2 mm or less. 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, particularly 0.1 mm or more, and particularly preferably 0.3 mm or more, it ensures the distribution of exudate across the entire area of ​​the tubular drainage foil utilizing capillary action in the drainage space. The distance between the inner boundary surfaces of the tubular elements defining the drainage space is preferably at least 50% of the area of ​​the drainage foil, and more preferably at least 70% of the area of ​​the drainage foil.

[0071] The tubular drainage foil according to the invention can have a connecting line, preferably a weld, connecting a first tubular element and a second tubular element, and / or the first tubular element and / or the second tubular element and an elastic material. For example, the connecting line can be provided by welding, particularly ultrasonic welding or laser welding, by thermal bonding, particularly by ultraviolet light or hot air, by adhesives, particularly glue or hook-and-loop fasteners, and / or by connecting devices, particularly clamps. For example, a connecting line (e.g., a weld) is created between the first and second edges by arranging a first edge of the drainage foil on a second edge and connecting the latter to each other (e.g., by ultrasonic welding).

[0072] It has been found that a width of 2 mm or less, preferably 1 mm or less, and more preferably 0.5 mm or less, along the circumferential direction of the tubular drainage foil is particularly advantageous for the function of the tubular drainage foil. Furthermore, a thickness of 1 mm or less, preferably 750 μm or less, and more preferably 450 μm or less, along the radial or depth direction of the tubular drainage foil has proven particularly advantageous for ensuring the function of the entire tubular structure.

[0073] For the use of tubular drainage foil in wound care, if the basis weight of the drainage foil is 30 g / m³... 2 Up to 90g / m 2 Within the range, 40g / m 2 Up to 80g / m 2 More preferably 50g / m 2 Up to 70g / m 2 This proves particularly advantageous if the tensile strength of the drainage foil is 7 N / 25.4 mm or higher, the elongation at break is 40% or greater, and the porosity is 75 μm. 3 / m 2 Effective exudate management can be ensured by a tensile strength of 0.5 N / 25.4 mm or higher and / or a bonding strength of 0.5 N / 25.4 mm or higher. Tensile strength is preferably measured according to DIN EN ISO 527. For example, the tensile strength of a tubular drainage foil is 7 N / 25.4 mm or higher, as measured according to DIN EN ISO 527. Elongation at break is preferably measured according to DIN EN ISO 527. For example, the elongation at break of a tubular drainage foil is 40% or higher, as measured according to DIN EN ISO 527. Bonding strength is preferably measured according to Edana NWSP401.0.R0. For example, the bonding strength of a tubular drainage foil measured based on or according to Edana NWSP401.0R0 is 0.5 N / 25.4 mm or higher. Porosity is a measure of the ratio of the cavity volume to the total volume of the drainage foil.

[0074] The tubular drainage foil according to the invention may have a tube opening at at least one end. For example, a tubular drainage foil may be provided having a tube opening at one end and a continuous material, such as a mesh element connected by connecting wires and / or a tubular element forming the tube end, at the other end of the tubular structure. Alternatively, a tubular drainage foil may be provided having tube openings at both ends. For certain applications, such as drainage of deep wounds, it proves particularly advantageous if the tubular drainage foil has a tube opening at one end and not at the other.

[0075] According to the invention, the tubular drainage foil may have reinforcing elements, particularly reinforcing strips or reinforcing foils, at at least one end of the tube and / or along the connecting line. For example, the reinforcing strip may be an area where material (e.g., double-walled drainage foil, particularly drainage foil prepared according to the method of the invention) exists in two layers, and / or an area where reinforcing material (e.g., polyethylene foil) is fixed to the first tubular element and / or the second tubular element. It has been found that foil, particularly polyethylene foil, has a particularly advantageous reinforcing effect as a reinforcing element. The structural integrity of the tubular drainage foil is particularly enhanced if the connecting line and / or at least one tube opening has a reinforcing element.

[0076] The superior structural integrity of the tubular drainage foil according to the invention is further enhanced if the tubular drainage foil has a reinforcing region at at least one end and exists therein in at least two layers. This is particularly advantageous for applications where auxiliary tools (such as absorbents, tubes, threads, supports, or insertion aids) are inserted into the tubular drainage foil. The reinforcing region further stabilizes the tube opening, allowing any desired auxiliary tool to be inserted into the tubular drainage foil without the risk of tearing the foil. In terms of fabrication techniques, it proves advantageous if the reinforcing region is formed in the form of two layers of edges, which are formed by folding a portion of the tubular drainage foil downward at the tube end, wherein the downward folding is particularly carried out in such a manner that a second tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drainage foil in the reinforcing region, particularly the outer boundary surface of the reinforcing region of the tubular drainage foil. The downwardly folded edges can be fixed in a dotted manner.

[0077] According to the present invention, the outer boundary surface of the tubular drainage foil, the inner boundary surface of the tubular drainage foil, and / or the inner cavity of the tubular drainage foil, which are formed by the inner boundary surface of the tubular drainage foil, may include a sliding aid and / or an insertion aid. Such a sliding aid and / or insertion aid can further improve ease of use and simplicity of application. For example, the outer boundary surface and / or inner boundary surface of the tubular drainage foil may be configured with low-friction surfaces, particularly an anti-stick coating and / or a micro-roughened surface, to facilitate insertion. In particular, the outer boundary surface and / or inner boundary surface of the tubular drainage foil may include or be coated with silicone resin, polytetrafluoroethylene (PTFE), and / or moisture to facilitate insertion. Sliding aids that significantly improve sliding ability include, for example, water-based lubricants, glycerol-based lubricants, polymer gels, particularly anti-allergenic polymer gels, endoscopic lubricants, particularly endoscopic sliding gels, and / or aqueous solutions, particularly sodium chloride solutions. It is particularly advantageous if the substance used as the sliding aid can dissolve without residue, particularly in aqueous solutions, to prevent residue on the product. Insertion aids comprising fabrics and / or plastics are particularly suitable as insertion aids. Insertion aids may include low-friction surfaces, particularly anti-stick coatings and / or micro-roughened surfaces. For example, insertion aids may include fabrics and / or plastics, wherein the fabric or plastic comprises or is coated with silicone, polytetrafluoroethylene (PTFE), and / or moisture. Insertion aids may be tubular insertion aids disposed within the lumen of a tubular drainage foil, such as tubular insertion aids having a tube opening or two tube openings. In particular, the insertion aid may have a tube opening at one end and a closed tube end at the other end. The tubular insertion aid may have a predetermined break point at its closed tube end. The tubular drainage foil may be provided in a single-cavity or multi-cavity manner.

[0078] Therefore, tubular drainage foils are particularly advantageous for a variety of applications, such as endoscopic applications, gynecological or urological applications, and thoracic, visceral, and / or hip surgery applications. The length of the tubular drainage foil can range from 0.5 cm to 40 cm, preferably 2 cm to 30 cm, and more preferably 5 cm to 20 cm. However, longer or shorter tubular drainage foils can also be provided. For example, tubular drainage foils with a length of 10 cm or longer, or 20 cm or longer, are suitable for endoscopic applications in the gastrointestinal tract and fistulas. In the case of applications in various wound cavities, the length can be adapted to the wound cavity; for example, tubular drainage foils with a length of 10 cm or less can be provided for wound cavities, and tubular drainage foils with a length of 5 cm or less (e.g., 2 cm or less) can be provided for smaller wound cavities.

[0079] Furthermore, tubular drainage foils with an outer diameter in the range of 1 mm to 60 mm, preferably 2 mm to 50 mm, and more preferably 4 mm to 30 mm, are particularly suitable for a variety of applications in terms of effective wound management. However, tubular drainage foils with larger or smaller outer diameters can also be provided. Smaller outer diameter tubular drainage foils are particularly suitable for applications involving narrow wounds and / or deep body areas, such as those in pancreas, gynecology, or urology, and for intracavitary applications, for example, tubular drainage foils with an outer diameter of 5 mm or less, especially 4 mm or less. The tubular drainage foil according to the invention has the advantage of ensuring uniform drainage performance and preventing tissue blockage of the drainage outlet, even with a small outer diameter. Therefore, even with a very small outer diameter, the tubular drainage foil can actively drain fluid. In invasive surgical cases, such as on the hip joint, especially in cases with a large wound area, tubular drainage foils with larger outer diameters, such as 6 mm or more, can also be used. Depending on the accessibility and size of the wound area, tubular drainage foils with appropriate length and outer diameter can be provided.

[0080] Wound care kit

[0081] The object of the present invention is also achieved by a wound care kit according to the invention, comprising a tubular drainage foil prepared according to the method for preparing tubular drainage foil according to the invention, or a tubular drainage foil prepared according to the invention, and at least one other component, such as those selected from absorbent bodies, tubes, sutures, supports, and insertion aids. For the particularly simple treatment of the wound care kit, it has proven advantageous if at least a portion of the at least one other component is disposed within the lumen of the tubular drainage foil, which is formed by the inner boundary surface. For particularly effective negative pressure therapy, the wound care kit may include, for example, a tubular drainage foil and a drainage tube, wherein a portion of the drainage tube is disposed within the lumen of the tubular drainage foil. The drainage tube may be connected to a negative pressure source. The at least one other component may be partially or wholly disposed within the tubular drainage foil.

[0082] In a particularly preferred embodiment of the invention, the absorbent is a sponge, foam, especially polyurethane or polyvinyl alcohol foam, or gauze. It has been found that wound care kits with such absorbents can effectively aspirate fluid from body areas, particularly wound areas. If the absorbent is placed within the lumen of a tubular drainage foil formed by its inner boundary surface, tissue adhesion to the absorbent can be prevented. Therefore, fluid can be effectively and non-invasively aspirated from the wound area.

[0083] In terms of particularly advantageous aspiration efficiency, it has proven advantageous if the tube included in the wound care kit is a drainage tube. The drainage tube can be single-lumen or multi-lumen. Wound care kits with drainage tubes allow for continuous aspiration of fluid from the wound area, and also allow for the aspiration of large amounts of fluid. Because tubular drainage foils can be supplied in any size, particularly any outer diameter, any length, and any shape, wound care kits can even be equipped with tubes and / or used with tubes having complex geometries, such as multi-lumen geometries.

[0084] The length of the wound care kit according to the invention can range 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 its respective application; for example, a wound care kit with a length of at least 10 cm or at least 20 cm can be provided for intraluminal or fistula applications. For oral cavity applications, the length can be adapted to the corresponding oral cavity; for example, the length of the wound care kit can be less than 10 cm, less than 5 cm, or less than 2 cm, depending on the size or depth of the oral cavity.

[0085] Medical uses and methods for wound care

[0086] This invention also relates to the application of the tubular drainage foil and wound care kit according to the invention in wound care, for example, for draining wounds and / or the method for wound care according to the invention. The tubular drainage foil or wound care kit is preferably used for drainage, for example, during and / or after surgery. The tubular drainage foil or wound care kit according to the invention is preferably used, for example, to drain bodily fluids from the wound area during surgery. The tubular drainage foil and wound care kit according to the invention allow for simple and reliable aspiration of fluids from the wound. The tubular drainage foil and wound care kit according to the invention can be used, for example, in cavities such as the gastrointestinal tract, gynecological and urological surgeries, surgical procedures such as thoracic, visceral, and hip surgeries, and negative pressure therapy. The tubular drainage foil or wound care kit can be used for drainage, particularly within the scope of surgical procedures. Therefore, blood, wound secretions, and / or tissue fluid often accumulate during surgical interventions, and their accumulation in the wound cavity can be prevented by applying drainage. In this way, the healing process can be significantly promoted.

[0087] The tubular drainage foil or wound care kit according to the invention can be particularly advantageously combined with negative pressure therapy for wound care. In this case, the tubular drainage foil or wound care kit according to the invention serves as a direct interface between the wound (particularly the wound base) and the area for removing wound filler or exudate (e.g., a drainage tube). Particularly advantageously, the tubular drainage foil or wound care kit according to the invention can be used for wounds of internal organs. In this case, the tubular drainage foil is applied to the wound, wherein the tubular drainage foil provides drainage function and a very smooth surface to prevent adhesion or friction between tissue and the foil. The tubular drainage foil or wound care kit according to the invention can be anatomically pre-formed, but can also be configured to be customized according to specific circumstances. When used in conjunction with negative pressure therapy, a filling medium such as gauze or foam can be filled into the tubular drainage foil or wound care kit according to the invention, and / or a drainage tube can be inserted. The tube for draining exudate or for wound drainage can be drawn from inside the body (e.g., the abdominal cavity) and connected to a negative pressure source, which can be maintained by a pump or through central home care in a hospital. By using a negative pressure source, exudate can be removed from the wound using the tubular drainage foil or wound care kit according to the present invention, thereby achieving good exudate management.

[0088] In the medical application of the tubular drainage foil or wound care kit according to the invention, the following advantages may be achieved: - the openings that allow body fluids to pass through help to clear exudate and prevent exudate from flowing back into the wound space (capillary action).

[0089] - Tubular drainage foil can prevent tissue or cells from adhering to the wound base or surrounding organs.

[0090] - Tubular drainage foils or wound care kits can be customized to any size or structure of the wound area without compromising drainage function, thus also suitable for treating complex wounds.

[0091] The present invention also relates to a method of wound care, comprising contacting a tubular drainage foil according to the invention or a wound care kit according to the invention with a patient's wound. Specifically, contacting the tubular drainage foil or wound care kit with the patient's wound allows bodily fluids (e.g., exudate or blood) to flow from the wound into the tubular drainage foil or into the wound care kit. The tubular drainage foil according to the invention and the wound care kit according to the invention allow bodily fluids, particularly blood or wound fluid, to be effectively drained or aspirated from the wound. The method for wound care according to the invention has the advantage of effectively aspirating bodily fluids and preventing the penetration of bacteria or other pathogens into the wound area.

[0092] Methods of wound care can include wound drainage. These methods are applicable to all areas of medicine and all regions of the body, such as endoscopic applications, gynecological or urological applications, and applications in thoracic surgery, visceral and / or hip surgery. As mentioned above, the length and / or outer diameter of the tubular drainage foil or wound care kit can be adapted to the requirements of the corresponding wound area; for example, a small outer diameter can be used for endoscopic applications in the gastrointestinal tract. The wound care method according to the invention can be used in any area of ​​the body and any wound because the shape of the tubular drainage or wound care kit can be adjusted according to the shape of the corresponding area of ​​the body, the wound, or the area requiring drainage. According to the invention, tubular drainage foils or wound care kits are provided that have any shape, any size, and any outer diameter, suitable for any wound or any medical purpose. For example, the tubular drainage foil can be circular or cylindrical, for example, for applications in the gastrointestinal tract or fistulas, or configured as a flat tubular drainage foil, particularly a flat drainage foil. Furthermore, the tubular drainage foil can be provided in any size.

[0093] The method for wound care according to the present invention has advantages over other methods for wound care, such as less adhesion to tissue compared to absorbents like polyurethane foam, thereby reducing the risk of injury and bleeding. Therefore, the method according to the present invention is even suitable for sensitive body sites, such as areas of blood vessels or pre-damaged tissue, and for patients with an increased risk of bleeding. Furthermore, it can be used in a versatile manner, as tubular drainage foil or wound care kits can be used, tailored to the anatomical and drainage requirements of the wound area. Attached Figure Description

[0094] The invention will now be explained with reference to the accompanying drawings, wherein all details essential to the invention are explicitly shown and not highlighted in greater detail in the specification. As shown in the figures:

[0095] Figure 1 This is a schematic diagram of an ultrasonic welding device;

[0096] Figure 2 This is a schematic diagram of the stamping device;

[0097] Figure 3 This is a schematic diagram of a device for flipping tubular drainage foil;

[0098] Figure 4 It is a schematic diagram of a crease-forming or wrapping technique used to fold or crease the drainage foil downward around a fold line, particularly a crease line, or to wrap the drainage foil around a winding shaft so that the drainage foil has an overlapping area that can be connected to a connecting line;

[0099] Figure 5 This is a schematic diagram of a self-adhesive drainage foil, which can be used as a tubular drainage foil by wrapping or folding.

[0100] Figure 6 This is a schematic diagram of a self-adhesive drainage foil, which can be used as a tubular drainage foil by wrapping or folding (e.g., around a drainage tube);

[0101] Figure 7 It is a schematic diagram of the connecting lines, especially the weld seam;

[0102] Figure 8 This is a schematic diagram of attaching the reinforcing element to the drain foil;

[0103] Figure 9 This is a schematic diagram of the insertion auxiliary device;

[0104] Figure 10 This is a schematic diagram of a rolled-up tubular drainage foil and a rolled-up tubular drainage foil;

[0105] Figure 11 This is a schematic diagram of a tubular drainage foil made of elastic material;

[0106] Figure 12 This is a schematic diagram of a tubular drainage foil with reinforced edges by folding downwards;

[0107] Figure 13 This is a schematic diagram of a tubular drainage foil;

[0108] Figure 14 This is a schematic diagram of a tubular drainage foil with a tube.

[0109] Figure 15 This is a schematic diagram of a tubular drainage foil with a tube and an absorbent body;

[0110] Figure 16 This is a schematic diagram of a wound tubular drainage foil with a tube. Detailed Implementation

[0111] Figure 1 The ultrasonic welding apparatus shown can be used to prepare the drainage foil 3 according to the invention, particularly the tubular drainage foil 3a. For example, the ultrasonic welding apparatus can be used to prepare the tubular drainage foil 3a by simultaneous stamping and welding; here, due to ultrasonic welding, overlapping materials are joined in the overlapping area to form a connecting line 11, while removing the edge strips of residual material. The double-walled drainage foil 3b is inserted into the base 4 and fixed in a downward folded manner. The ultrasonic welding mold 1, for example an L-shaped ultrasonic welding mold 1, is located in the support frame 2 above the base 4. A generator induces the required voltage into the welding mold 1. The welding mold 1 moves downward and welds the outline of the tubular drainage foil 3a. After the welding operation is completed, the support frame 2 moves back to the starting position. The tubular drainage foil 3a can then be removed. The left figure is a plan view of the ultrasonic welding apparatus, and the right figure is a side view.

[0112] Figure 2 The stamping apparatus shown can be used to prepare the drainage foil 3 according to the invention. The provided double-walled drainage foil 3b is inserted into the lower half of the stamping tool in a downward folded manner on one side. An integrated heated cutting tool is provided in the lower half of the stamping tool. The stamping operation is started by moving the upper half of the die downward. In the same operation, the hot and sharp cutting element 5 welds the drainage foil 3b to the cutting edge and separates it, thereby obtaining a tubular drainage foil 3a with a weld seam 6. The foil residue 7 is removed by stamping. The die is then opened by moving the upper half of the die upward, and the tubular drainage foil 3a can be removed.

[0113] Figure 3 The apparatus shown can be used to flip the tubular drainage foil 3a. First, the tubular drainage foil 3a is prepared according to one of the methods described above, for example by welding overlapping areas to form a connecting line 11. For use in wound areas, especially to prevent tissue adhesion, it has proven particularly advantageous if the connecting line 11 has a smooth surface on the outside of the tubular drainage foil 3a. To create a smooth surface on the weld 6, the tubular drainage foil 3a can be flipped from the inside out, such that one side 10 of the connecting line 11 (previously facing away from the fold line, particularly the crease line) is located on one side 12 of the connecting line 11 (facing the fold line, particularly the crease line) after flipping. The tubular drainage foil 3a can be pulled onto the upper movable plunger 8 of the apparatus shown for tipping or flipping. Furthermore, the sleeve 9 moves on the movable plunger 8 and rotates the tubular drainage foil 3a by means of the rigid reverse plunger 13.

[0114] Figure 4 The folding-over or winding technique shown can be used to place the drainage foil 3 planarly on the winding shaft 27, for example, on the end of the tube 16, or fold it onto the tube 16. For example, the drainage foil 3 can be wound around the winding shaft 27 such that the drainage foil 3 has an overlapping area formed by the winding around the winding shaft 27 and can be connected to the connecting line 11, and the drainage foil 3 exists in at least two layers in this overlapping area. The overlapping area can then be joined or secured to obtain a tubular drainage foil 3a, for example by adhesive 14 or connecting devices such as clamps, seams, or ring application aids.

[0115] Figure 5The self-adhesive drainage foil 3 shown can be fixed to any desired structure, such as body parts, surgical devices, absorbents, tubes, sutures, supports, insertion aids 22, and / or negative pressure treatment devices. The adhesive 14, particularly glue, bonding materials, and / or hook and loop fasteners 15, such as one or more barbs, attached to the drainage foil 3 can be used to wrap or fold the drainage foil 3 around other structures, and then, particularly in a tubular manner, to or around the structure. This drainage foil 3 can be used as a self-adhesive tubular drainage foil 3a, with the advantage of being adaptable to structural requirements on-site, such as adapting to the size of the wound cavity. During the wrapping or folding of the drainage foil 3 around the corresponding structure (e.g., around a drainage tube), the adhesive or bonded portion of the drainage foil 3 is fixed to another part of the drainage foil 3. If the drainage foil 3 fixed to the structure in this way must withstand particularly high mechanical loads, additional fixation of the drainage foil 3 can be achieved through seams if necessary. According to the present invention, the drainage foil 3 may be provided with one or more adhesive portions, in particular, adhesive 14 may be attached to one portion, or adhesive 14, such as two complementary components of hook and loop fasteners 15a, 15b, may be attached to two or more portions so that they can be attached to each other.

[0116] Figure 6 A self-adhesive drainage foil 3 with an adhesive 14 is shown, which can be wrapped around a tube 16 or a probe, and thus can be used as a tubular drainage foil 3a.

[0117] Figure 7 A schematic diagram of the connecting line 11 between the first element 17 and the second element 18, particularly the weld 6, is shown, for example, a first mesh element and a second mesh element, or a first tubular element and a second tubular element. Detail A shows that the foil thickness is gradually reduced by the connection, particularly by the welding operation. The foil is compressed in the region of the connecting line 11, particularly the weld 6. By compressing the double-walled drain foil 3b in the region of the connecting line 11 and the cutting wheel angle, a geometrically relevant angle α is created between the ridge of the connecting line 11 and the outer boundary surface 28 of the tubular drain foil 3a.

[0118] The connecting lines 11 of the perforated drainage foil 3, such as weld 6, can represent the critical point of the product in terms of foil stability. In order to equip the tubular drainage foil 3a of the present invention with an open drainage space 20 with particularly excellent strength properties, especially to improve the strength of the connecting lines 11 (such as weld 6), they can be reinforced with additional materials. Figure 8A schematic diagram is shown, for example, of attaching a reinforcing element 29 to a drainage foil 3 comprising a first element 17 and a second element 18, for example by welding to a cutting wheel 19. Specifically, non-perforated polyethylene foil can be used as an additional material or reinforcing element 29. To enable particularly efficient welding of an additional foil layer, such as an additional, particularly non-perforated, polyethylene foil, to the drainage foil 3, the foil layer can be made of polyethylene. Due to the additional welding of the particularly non-perforated polyethylene foil, for example during the welding process, more material flows into the holes of the drainage foil 3 in the region of the connecting line 11 and stabilizes the holes, thereby achieving excellent strength. This reinforcing element 29, such as the polyethylene foil, significantly increases the tensile load of the weld 6. To attach the reinforcing element 29, the reinforcing element, such as the additional polyethylene foil, can be placed on the drainage foil 3 and then folded downwards. During the joining process, for example by ultrasonic welding, the reinforcing element 29 connects to the drainage foil 3 in the overlapping area, thereby creating the connecting line 11, and particularly the stable weld 6. Residual material 21 of the reinforcing element 29, such as residual polyethylene foil, is then removed in the area of ​​the connecting line 11, particularly in the area of ​​the weld 6, for example, by manual or mechanical means. The reinforcing element 29, such as polyethylene foil, can be configured to exist only in the connecting line 11, particularly in the weld 6.

[0119] Figure 9 The tubular drainage foil 3a with insertion aid 22 shown simplifies the application of the drainage foil 3. Various materials, such as textiles or plastics, which have low friction relative to plastics, such as slightly rough textiles, can be used as the insertion aid 22. The insertion aid 22 can be applied to the tube 16 ( Figure 9 The left side of the tubular drainage foil 3a can also be directly integrated into the drainage foil 3a, or included in the inner cavity of the tubular drainage foil 3a. Figure 9 (on the right side). For example, the insertion auxiliary device 22 can be placed on the tube, such as a drainage tube or a probe ( Figure 9 (Left side of the image). The tubular drainage foil 3a can have a closed end, for example, if the tube 16 is covered by the tubular drainage foil 3b. It has been found that if such a closed end has a predetermined break point 23, it is advantageous for certain applications. By means of the predetermined break point 23, the insertion aid 22 can be removed by applying force. The insertion aid 22 can also be a tubular device with two open ends (in the image). Figure 9(Right side of the image). Regarding the manufacturing technique, it has been found particularly advantageous if the insertion aid 22 is incorporated into the tubular drainage foil 3a during its preparation. For the simple handling of the insertion aid 22, it has proven advantageous if the insertion aid 22 is longer than the tubular drainage foil 3a, protruding from the end of the tubular drainage foil 3a and being grippable. After the tubular drainage foil 3a or a tube covered by the tubular drainage foil 3b is inserted into the wound area, the insertion aid 22 can be removed by simple pull-out.

[0120] Figure 10 A rolled-up tubular drainage foil 3a is shown. The advantage of partially or fully rolled-up tubular drainage foil 3a is that it can be packaged efficiently, particularly in an environmentally friendly manner by saving material. Furthermore, it is advantageous that the user can effortlessly roll the tubular drainage foil 3a onto structures such as tubes 16, especially drainage tubes or probes, to wrap them with the tubular drainage foil 3a. To roll up the tubular drainage foil 3a, a portion or the entire tubular drainage foil 3a can be rolled up along the longitudinal tube axis 30, starting from the tube opening at the tube end. Specifically, the tubular drainage foil 3a can be rolled up from the inner boundary surface along the direction of the outer boundary surface 28 along the longitudinal tube axis 30 to roll up a portion or the entire tubular drainage foil 3a.

[0121] Figure 11 A tubular drainage foil 3a with an elastic material is shown. The tubular drainage foil 3a may have, for example, an elastic foil 24 or an elastic seam 25, particularly a seam made of an elastic material. The elasticity of the tubular drainage foil 3a can be increased by integrating the elastic material into it, especially if the double-walled drainage foil 3b used to form the tubular drainage foil 3a is composed of a micro-expansion material. The tubular drainage foil 3a with the elastic material can be formed by connecting the double-walled drainage foil 3b to the elastic material along the overlapping area between the drainage foil 3b and the elastic material. By integrating an elastic material, such as a strip of elastic foil 24 or an elastic seam 25, the tubular drainage foil 3a can be expanded particularly well, thereby facilitating application, for example, in drainage tubes.

[0122] Figure 12A side view of a tubular drainage foil 3a with reinforced edges by downward folding is shown. The tubular drainage foil 3a may have reinforced regions formed at one or both ends in the circumferential direction. In terms of manufacturing techniques, forming the reinforced regions by downward folding portions of the tubular drainage foil 3a at the ends has proven particularly effective, wherein the downward folding is performed, specifically 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 region 26 of the tube opening may be folded downward to the outside, thereby providing double walls and thus reinforcing the edges of the tubular drainage foil 3a. The downward folded edges may be fixed in a dotted manner, for example, by seams. The reinforced edges effectively prevent tearing of the tubular drainage foil 3a.

[0123] Figure 13 Various embodiments of the tubular drainage foil 3a according to the invention are shown. In particular, the tubular drainage foil 3a may have a tube opening 32 or an open tube end at one end and a closed tube end 33 at the other end. The tubular drainage foil 3a may also have tube openings 32 at both ends. The tubular drainage foil 3a may also have reinforcing elements 29, such as downwardly folded edges.

[0124] Figure 14 A side view of a tubular drainage foil 3a with tube 16 is shown, which may be supplied together with a wound care kit 34. Figure 15 A side view of a tubular drainage foil 3a having a tube 16 and an absorbent body 35 is shown, which can be provided together as a wound care kit 34. Figure 16 A side view of a drainage foil 3 is shown, such as a tubular drainage foil 3a, which has a tube 16 and a connecting device 36, such as a ring-shaped application aid or clamp, which can be provided together as a wound care kit 34.

[0125] Reference tag list

[0126] 1 Welding mold

[0127] 2 support frames

[0128] 3 Drainage Foil

[0129] 3a tubular drainage foil

[0130] 3b double-walled drainage foil

[0131] 4 bases

[0132] 5 cutting elements

[0133] 6 welds

[0134] 7 foil residue

[0135] 8 plungers

[0136] 9 sleeves

[0137] 10. The connecting line is on the side away from the fold line, especially the crease line.

[0138] 11 connecting cable

[0139] 12. The side of the connecting line facing the fold line, especially the crease line.

[0140] 13 Reverse Plunger

[0141] 14 Adhesives

[0142] 15 Hook and Loop Fasteners

[0143] 15a and 15b hook and loop fasteners

[0144] 16 tubes

[0145] 17 First Component

[0146] 18 Second Component

[0147] 19 cutting wheels

[0148] 20 traffic-generating spaces

[0149] 21 Residual Materials

[0150] 22 Insertion auxiliary device

[0151] 23 Predetermined fracture point

[0152] 24 elastic foil

[0153] 25 Flexible Joint

[0154] 26 edge areas

[0155] 27 winding shafts

[0156] 28. Outer boundary surface of tubular drainage foil

[0157] 29 Reinforcing Components

[0158] 30 tube shaft

[0159] 31 Inner boundary surface of tubular drainage foil

[0160] 32 tube opening

[0161] 33 Closed pipe end

[0162] 34 Wound Care Kit

[0163] 35 absorbers

[0164] 36 connecting devices

Claims

1. A method for preparing a tubular drainage foil, characterized in that, The method includes the following steps: a) Provide a drainage foil, wherein the step of providing the drainage foil includes: i) Provide a first mesh element and a second mesh element; ii) Perforating the first mesh element and the second mesh element, wherein at least one opening is formed in each of the first mesh element and the second mesh element to allow body fluid to pass through; iii) Arrange the first mesh element on the second mesh element such that the first mesh element and the second mesh element are arranged substantially parallel to each other; iv) In at least one fastening area, the first mesh element and the second mesh element are connected to obtain a double-walled drainage foil that forms an open drainage space between the first mesh element and the second mesh element; The step of providing the drainage foil further includes forming the drainage foil into a tubular structure; And the drainage foil satisfies at least one of the following properties: Tensile strength ≥ 7 N / 25.4 mm; Elongation at break ≥ 40%; Porosity ≥ 75 m³ / m² / min; Bond strength ≥ 0.5 N / 25.4 mm; b) Fold or crease the drainage foil downwards around the fold line or pleat line to itself, so that the drainage foil forms an overlapping area that can be connected to form a connecting line; wherein the drainage foil has a first edge and a second edge extending substantially parallel to the first edge, and the drainage foil is folded or creased to itself along the fold line or pleat line, so that the drainage foil forms an overlapping area that can be connected to form a connecting line along the first edge and the second edge; c) Connecting the drainage foil along the overlapping region, wherein connecting lines are formed; d) Obtain tubular drainage foil.

2. A method for preparing a tubular drainage foil, characterized in that, The method includes the following steps: a) Provides a drainage foil and an elastic material, wherein the drainage foil includes: i) Provide a first mesh element and a second mesh element; ii) Perforating the first mesh element and the second mesh element, wherein at least one opening is formed in each of the first mesh element and the second mesh element to allow body fluid to pass through; iii) Arrange the first mesh element on the second mesh element such that the first mesh element and the second mesh element are arranged substantially parallel to each other; iv) In at least one fastening area, the first mesh element and the second mesh element are connected to obtain a double-walled drainage foil that forms an open drainage space between the first mesh element and the second mesh element; The step of providing the drainage foil further includes forming the drainage foil into a tubular structure; And the drainage foil satisfies at least one of the following properties: Tensile strength ≥ 7 N / 25.4 mm; Elongation at break ≥ 40%; Porosity ≥ 75 m³ / m² / min; Bond strength ≥ 0.5 N / 25.4 mm; b) Arrange the first edge of the drainage foil on the elastic material such that an overlapping area that can be connected to form a connecting line is formed between the first edge of the drainage foil and the elastic material; c) Connecting the drainage foil and the elastic material along the overlapping area between the first edge of the drainage foil and the elastic material, wherein a connecting line is formed; d) Fold or crease the drainage foil downward relative to the fold line or pleat line onto the elastic material, such that an overlapping area that can be connected to a connecting line is formed between the second edge of the drainage foil, which extends substantially parallel to the first edge, and the elastic material. e) Connect the drainage foil and the elastic material along the overlapping area between the second edge of the drainage foil and the elastic material, wherein a connecting line is formed; f) Obtain tubular drainage foil.

3. A method for preparing a tubular drainage foil, characterized in that, The method includes the following steps: a) Provide a drainage foil, wherein the step of providing the drainage foil includes: i) Provide a first mesh element and a second mesh element; ii) Perforating the first mesh element and the second mesh element, wherein at least one opening is formed in each of the first mesh element and the second mesh element to allow body fluid to pass through; iii) Arrange the first mesh element on the second mesh element such that the first mesh element and the second mesh element are arranged substantially parallel to each other; iv) In at least one fastening area, the first mesh element and the second mesh element are connected to obtain a double-walled drainage foil that forms an open drainage space between the first mesh element and the second mesh element; The step of providing the drainage foil further includes forming the drainage foil into a tubular structure; And the drainage foil satisfies at least one of the following properties: Tensile strength ≥ 7 N / 25.4 mm; Elongation at break ≥ 40%; Porosity ≥ 75 m³ / m² / min; Bond strength ≥ 0.5 N / 25.4 mm; b) The drainage foil is wound around a winding shaft to create an overlapping area, wherein the overlapping area is formed by the winding around the winding shaft to create at least two layers of drainage foil overlapping, and a connecting line may be formed in the overlapping area; c) Connect the first and second layers of at least two layers of drainage foil existing in the overlapping area to form a connecting line; d) Obtain tubular drainage foil.

4. The method according to any one of claims 1-3, characterized in that, The diameter of the at least one opening that allows bodily fluids to pass through is in the range of 100 μm to 2000 μm.

5. The method according to claim 4, characterized in that, The diameter of the at least one opening that allows bodily fluids to pass through is in the range of 300 μm to 700 μm.

6. The method according to claim 5, characterized in that, The diameter of the at least one opening that allows bodily fluids to pass through is in the range of 400 μm to 600 μm.

7. The method according to any one of claims 1-3, characterized in that, In step iv), the first mesh element and the second mesh element are connected at multiple fastening areas.

8. The method according to claim 7, characterized in that, The first mesh element and the second mesh element are connected at multiple fastening areas formed by a mesh arrangement.

9. The method according to claim 7 or 8, characterized in that, In each case, the distance between adjacent fastening areas is 2 mm or greater.

10. The method according to any one of claims 1-3, characterized in that, The drainage foil has a basis weight in the range of 30 g / m 2 to 90 g / m 2 .

11. The method according to claim 10, characterized in that, The drainage foil has a basis weight in the range of 40 g / m 2 to 80 g / m 2 .

12. The method according to claim 11, characterized in that, The basis weight of the drainage foil is 50 g / m³. 2 Up to 70 g / m 2 Within the range.

13. The method according to any one of claims 1-3, characterized in that, The at least one opening that allows bodily fluids to pass through has a circular, annular, and / or elliptical shape in a planar view relative to the planar extent of the first or second mesh element.

14. The method according to any one of claims 1-3, characterized in that, The method includes attaching adhesives, bonding materials, and / or hook and loop fasteners to the drainage foil.

15. The method according to any one of claims 1-3, characterized in that, Step ii) is performed before or after step iii), and / or step iv) is performed after step iii) and before or before step ii).

16. The method according to any one of claims 1-3, characterized in that, The connection is made by welding, thermal bonding, adhesive, and / or by a connection device.

17. The method according to any one of claims 1-3, characterized in that, The connection is achieved by ultrasonic welding, with a speed in the range of 0.1 m / min to 5.0 m / min, a power in the range of 50 W to 500 W, and / or a pressure in the range of 5 N to 100 N.

18. The method according to any one of claims 1-3, characterized in that, The connection includes: arranging the drainage foil in an ultrasonic welding device and welding the drainage foil to form a tubular drainage foil.

19. The method according to any one of claims 1-3, characterized in that, The connection is achieved by ultrasonic welding, which uses a cutting wheel with a cutting edge radius of 0.2 mm or less, and / or a cutting wheel with a grinding angle of 15° or less facing the fold line or wrinkle line, and / or a grinding angle of 75° or less away from the fold line or wrinkle line.

20. The method according to any one of claims 1-3, characterized in that, During or after the connection process, the edge strip of the drain foil located on the side of the connection line away from the fold line or crease line is removed.

21. The method according to any one of claims 1-3, characterized in that, The width of the connecting line along the circumferential direction of the tubular drainage foil is 2 mm or less.

22. The method according to any one of claims 1-3, characterized in that, The thickness of the connecting line along the radial direction of the tubular drainage foil is 1 mm or less.

23. The method according to any one of claims 1-3, characterized in that, The method includes attaching a reinforcing element, reinforcing strip, or reinforcing foil to the area of ​​the connecting line and / or at least one end of the tube, by arranging the reinforcing element in the overlapping area before connection.

24. The method according to claim 23, characterized in that, The reinforcing element is a foil.

25. The method according to claim 24, characterized in that, The reinforcing element is a polyethylene foil.

26. The method according to any one of claims 1-24, characterized in that, The tubular drainage foil forms a reinforcing region at at least one end in the circumferential direction, and the drainage foil exists in the reinforcing region in the form of at least two layers.

27. The method according to claim 26, characterized in that, The reinforced region is formed by folding a portion of the tubular drainage foil downward at the tube end.

28. The method according to claim 27, characterized in that, The downward folding is performed in such a way that the tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drainage foil in the reinforced region.

29. The method according to any one of claims 1-24, characterized in that, At least a portion of the tubular drainage foil is rolled up along the longitudinal axis from the tube opening at the tube end.

30. The method according to claim 29, characterized in that, It is rolled up along the longitudinal tube axis from the inner boundary surface to the outer boundary surface.

31. The method according to any one of claims 1, 2, 4-24, characterized in that, After connection, by flipping the tubular drainage foil, the side of the connecting line facing the fold line or crease line is rotated completely outward.

32. A tubular drainage foil, characterized in that, The tubular drainage foil has a first tubular element forming an outer boundary surface and a second tubular element forming an inner boundary surface opposite to the outer boundary surface, and the second tubular element is connected to the first tubular element through at least one fastening region. The first tubular element and the second tubular element each include at least one opening allowing bodily fluid to pass through, and form an open drainage space between the outer boundary surface and the inner boundary surface; the drainage foil has a tensile strength of 7 N / 25.4 mm or higher, an elongation at break of 40% or higher, and a porosity of 75 μm. 3 / m 2 / min or higher, and / or a bonding strength of 0.5 N / 25.4 mm or higher.

33. The tubular drainage foil according to claim 32, characterized in that, The first tubular element and / or the second tubular element are plastic foils; wherein the plastic foils include polyethylene, polypropylene, polyethylene terephthalate, polyurethane, polytetrafluoroethylene, polyhydroxybutyrate, polylactic acid and / or cellulose.

34. The tubular drainage foil according to claim 32, characterized in that, The first tubular element and the second tubular element are connected in multiple fastening regions.

35. The tubular drainage foil according to claim 34, characterized in that, The first tubular element and the second tubular element are connected in a plurality of fastening regions formed in a grid arrangement.

36. The tubular drainage foil according to claim 34 or 35, characterized in that, The distance between adjacent fastening areas is 2 mm or greater.

37. The tubular drainage foil according to claim 32, characterized in that, The tubular drainage foil has connecting lines that connect the first tubular element and the second tubular element, and / or the first tubular element and / or the second tubular element and an elastic material.

38. The tubular drainage foil according to claim 37, characterized in that, The width of the connecting line along the circumferential direction of the tubular drainage foil is 2 mm or less.

39. The tubular drainage foil according to claim 37 or 38, characterized in that, The thickness of the connecting line along the radial direction of the tubular drainage foil is 1 mm or less.

40. The tubular drainage foil according to any one of claims 32-35, characterized in that, The basis weight of the tubular drainage foil is 10 g / m³. 2 Up to 200 g / m 2 Within the range.

41. The tubular drainage foil according to claim 40, characterized in that, The basis weight of the tubular drainage foil is 40 g / m³. 2 Up to 80 g / m 2 .

42. The tubular drainage foil according to claim 41, characterized in that, The basis weight of the tubular drainage foil is 50 g / m³. 2 Up to 70 g / m 2 .

43. The tubular drainage foil according to any one of claims 32-35, characterized in that, The tubular drainage foil has a tube opening at at least one end; or, the tubular drainage foil has a tube opening at one end and no tube opening at the other end.

44. The tubular drainage foil according to any one of claims 32-35, characterized in that, The tubular drainage foil has a reinforcing element at at least one end and / or along the connecting line.

45. The tubular drainage foil according to any one of claims 32-35, characterized in that, The tubular drainage foil has a reinforcing region at at least one end of the tube, and the drainage foil exists in at least two layers in the reinforcing region.

46. ​​The tubular drainage foil according to claim 45, characterized in that, The reinforced region is formed in the form of two layers of edges, which are formed by folding a portion of the tubular drainage foil downward at the tube end.

47. The tubular drainage foil according to claim 46, characterized in that, The downward folding is performed in such a way that the second tubular element forming the inner boundary surface forms the outer boundary surface of the tubular drainage foil in the reinforced region, or forms the outer boundary surface of the reinforced region of the tubular drainage foil.

48. The tubular drainage foil according to any one of claims 32-35 and 46-47, characterized in that, The inner cavity of the tubular drainage foil, consisting of the outer boundary surface, the inner boundary surface, and / or the inner boundary surface, includes a sliding aid and / or an insertion aid.

49. The tubular drainage foil according to claim 48, characterized in that, The lubrication aids include water-based lubricants, glycerol-based lubricants, polymer gels, endoscopic lubricants, and / or aqueous solutions.

50. The tubular drainage foil according to claim 48, characterized in that, The insertion aid includes fabric and / or plastic; and / or the insertion aid is a tubular insertion aid arranged in the inner cavity of the tubular drainage foil.

51. The tubular drainage foil according to any one of claims 32-35, characterized in that, The length of the tubular drainage foil is in the range of 0.5cm to 40cm.

52. The tubular drainage foil according to claim 51, characterized in that, The length of the tubular drainage foil is between 2 cm and 30 cm.

53. The tubular drainage foil according to claim 52, characterized in that, The length of the tubular drainage foil is between 5 cm and 20 cm.

54. The tubular drainage foil according to any one of claims 32-35, characterized in that, The outer diameter of the tubular drainage foil is in the range of 1 mm to 60 mm.

55. The tubular drainage foil according to claim 54, characterized in that, The outer diameter of the tubular drainage foil is between 2 mm and 50 mm.

56. The tubular drainage foil according to claim 55, characterized in that, The outer diameter of the tubular drainage foil is between 4 mm and 30 mm.

57. A wound care kit, characterized in that, The tubular drainage foil prepared according to any one of claims 1-31 or according to any one of claims 32-56, and at least one other component selected from absorbent, tube, wire, support and insertion aid; wherein at least a portion of the at least one other component is arranged in the inner cavity of the tubular drainage foil formed by the inner boundary surface.

58. The wound care kit according to claim 57, characterized in that, The absorbent is a sponge, foam, polyurethane, polyvinyl alcohol foam, or gauze.

59. The wound care kit according to claim 57, characterized in that, The tube in question is a drainage tube.

60. The wound care kit according to any one of claims 57-59, characterized in that, The length of the wound care kit is in the range of 0.5cm to 250cm.

61. The wound care kit according to claim 60, characterized in that, The length of the wound care kit ranges from 10cm to 200cm.

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