DE102008062472A1 - Wound dressing for negative pressure therapy - Google Patents

Abstract

A wound dressing for negative-pressure therapy comprising a carrier layer (1) and a wound contact layer (2) applied to the wound-facing side of the carrier layer (1), wherein the wound contact layer (2) has openings (5) penetrating the wound contact layer (2) transversely to its planar extension in that the wound-facing side of the wound contact layer (2) has elevations (4) and depressions (7) and the wound contact layer (2) forms a contact surface (14) with a skin surface only in the region of the elevations (4) and a negative-pressure therapy system.

Description

The The invention relates to a wound dressing for negative pressure therapy comprising a carrier layer and one on the wound-facing Side of the carrier layer applied wound contact layer, wherein the wound contact layer is transverse to its planar extent the wound contact layer has penetrating openings.

Wound dressings for negative pressure therapy, for example, from WO 2005/123170 A1 US-A-5 / 599,841 which discloses a wound dressing for hyperthermia comprising a cover for attachment over a wound to achieve pressure reduction across the wound, the wound cover being cooperable with a source of negative pressure, and another layer, for example, formed from a hydrogel; having the openings to transport the negative pressure to the wound surface.

These Layer also serves to unwanted Components to remove or disable or desired Concentrate components in the area of the wound.

In addition, a wound drainage system is also from the US 6,979,324 B2 is known, comprising a shell with a filler that can hold wound fluid. Another wound dressing system is from the WO 02/083046 A1 previously known.

adversely on the known systems, on the one hand, that here by applying the negative pressure there is a risk that the wound dressing with the Wound glued, and on the other, that when adding single with the skin surface in contact pores the danger there is no longer any negative pressure on them can and thus areas to be acted upon by a negative pressure Wound are no longer exposed to negative pressure.

It It is therefore an object of the invention to provide a wound dressing for to provide the negative pressure therapy as well as a negative pressure therapy system for wound treatment, in which the mentioned disadvantages can not occur.

The Invention solves this problem with a wound dressing the features of claims 1 and by a vacuum therapy system with the features of claim 11.

there the wound-facing side of the wound contact layer is so formed that it has elevations and depressions and the wound contact layer only in the area of the surveys, a contact surface forms with the skin surface. This is the advantage given that no full-surface contact of the wound contact layer with the wound or the skin occurs and thus a contact only in a smaller part or over a partial area of the entire surface of the wound contact layer. hereby also reduces the risk of adhesion of the wound contact layer on the skin surface. The surveys point to this substantially parallel to the planar extent of Wound contact layer extending contact surface, with the they rest against the skin of a patient.

Especially is advantageous in the design according to the invention, that the application of the negative pressure to the skin over the surface of the wound dressing particularly evenly takes place and the risk of closure of individual pores thereby loses importance.

there It is particularly advantageous if the elevations and / or depressions are regularly trained and in particular a Train patterns. This can be the elevations or depressions be formed so that they form Halbkalotten. However, it is Also, a grid-like pattern and a strip arrangement conceivable. Also conceivable are other arrangements, such as honeycomb elevations, wherein the elevations are from the surface of the wound contact layer lift out in relief towards the wound. Especially advantageous can be provided that the elevations formed as webs are. If the surveys are based on the area Grafting the wound contact surface makes its surface (contact area) preferably 10-70%, especially 10-50% and in particular 10-40% of the total area of the wound contact layer. Unless the elevations through the base of the wound contact layer be formed and the wells through material recess of the Wound contact layer are formed on the base surface, can the proportion of the contact surface of the surveys between 30-90%, in particular 50-90% and in particular 60-90%.

Alternatively it can be provided that instead of a pattern formed by the surveys, ins in particular, a grid, etc. on the wound contact layer is formed by the depressions introduced into the surface of the wound contact layer in the direction of the side facing away from the wound, a pattern, in particular a grid is formed. Alternatively, other patterns may be formed by the depressions. The depressions and the elevations can both be provided or only elevations or only depressions can be provided.

in principle are in addition to regular patterns, such as lattices, etc also irregular patterns or disorderly Arrangements of surveys or depressions conceivable.

Under Recesses is understood to mean that starting from the plane Extension of the wound contact layer, which is the base area forms the wound contact layer, the recesses are formed so that in the areas of the depression, the wound contact layer a smaller thickness than in the other areas of the base having. Unless provided additional surveys are, which rise from the base, can in this If the wound contact layer has a contact surface with the Skin surface forms. In this case, the base area forms the surveys, d. H. the elevations coincide with the areal Extension of the wound contact layer together. Alternatively or in addition Surveys can be provided that are made up of the areal Raise the extent (base area) of the wound contact layer, so that in the area of the elevations, the thickness of the wound contact layer larger than in the area of the base area is. In this case, then, if no additional Recesses are provided, the depressions through the base the wound contact layer are formed.

The Contact surface with the skin in each case form the elevations.

To a particularly preferred design is provided that only Elevations or depressions are provided, resulting from the areal Extension (base area) of the wound contact layer in direction to raise to the wound.

The Wells and surveys can be between each 0.1 mm and 3.0 mm, in particular 0.1 and 2 mm, from the base raise or be sunk in this. Simultaneously or independently It can be provided that the wound contact layer has a thickness of not more than 10 mm, in particular not more than 8 mm, and especially preferably has a maximum of 5 mm.

To a particularly preferred embodiment may be provided be provided that the openings in the area of the recesses are. This ensures that the wells no direct contact with the skin surface, which achieves that it's not so easy to clog the openings, the negative pressure therapy, comes. In particular, about it In addition, the wells in terms of their areal Extension greater than the openings, so that the reduced pressure on a larger Skin surface can act.

Especially in conjunction with an embodiment in which the recesses connect the openings together, leaving channels are formed between the individual openings offers this has the advantage that all areas of the reduced Pressure to be applied skin surface even then can be applied with reduced pressure, if some of the openings, for example, by wound exudate, but also added by other material present in the wound are, and no longer the application of a diminished Serve pressure.

Especially it can preferably be provided that the wound contact layer hydrous hydrogel comprises and in particular from a hydrous Hydrogel exists.

at the carrier layer may in particular be such Material acting due to a porosity or due to of fiber spaces is an adjacent Submit negative pressure and over the area distribute the wound contact layer so that the negative pressure at all openings is applied. The material of the carrier layer may be therefore preferably an absorbent nonwoven material, but also to be an absorbent foam, a knit or a fabric or a layer comprising such materials. Used as a carrier material uses a nonwoven absorbent material, so may a wound dressing be provided, which is particularly easy to cut. hereby Can a variety of different wounds with different Geometry be supplied.

Particularly preferably, it can be provided that a boundary layer and / or anchoring layer is formed between the carrier layer and wound contact layer, wherein the boundary layer and / or anchoring layer In the manufacturing process, a part of the material of the wound contact layer penetrates into the carrier layer and thus forms an area in the carrier layer in which the wound contact layer material has entered the pores or between the fibers of the carrier layer

The openings can also be through the boundary and / or anchoring layer extend.

The hydrous hydrogels of the wound contact layer are, in particular, crosslinked hydrogels which have a sufficient internal relationship at low pressure. In particular, hydrophilic polyurethane gels can be used. Alternatively, these gels may be anhydrous. However, the hydrogels particularly preferably have a water content of at least 20% by weight, in particular of at least 30% by weight and very particularly preferably of at least 40% by weight, based on the gel, the hydrogel being up to 70% by weight. may have based on the gel. The gels are dimensionally stable under reduced pressure, in particular at an air pressure of 100 to 950 mbar and in particular from 600 to 950 mbar. In particular, these are those hydrogels which are used in the EP 630 029 A1 as well as the EP 426 422 A1 are hereby incorporated by reference for their disclosure. Finally, provision can be made for a hydrophobic cover layer to be provided on the side of the carrier layer facing away from the wound, which is provided in particular by a hydrophobic mesh material, which may in particular consist of a polyolefin and very particularly preferably of polyethylene. By means of this hydrophobic covering layer, adhesion of a transparent film dressing, which is used for airtight covering in a negative-pressure therapy system according to the invention, is prevented with the wound dressing. Thus, a particularly simple removal of the vacuum therapy system is possible, since the transparent film dressing and the wound dressing can be detached from a wound separately from each other.

there can be provided that the dimensions of the carrier layer and the wound contact layer as well as the boundary and / or anchoring layer and the cover layer are the same and in the planar direction complete the layers with each other.

Under an arrangement of the openings transverse to the flat Extension should here be understood to mean any arrangement that is suitable is the two flat sides of the wound contact layer and the boundary and / or anchoring layer to connect with each other, where the openings from a flat side up extend to the other flat side and thus the respective Penetrate layer. Particularly preferred is the axis of the openings perpendicular to the planar extension of the wound contact layer. Alternatively, however, inclined openings can also be used be provided.

Of Furthermore, the invention comprises a vacuum therapy system comprising a wound dressing of the type described above and a drainage tube for connection to a drainage system.

Especially It can preferably be provided that the drainage tube into the Carrier layer is inserted, wherein the drainage tube in particular runs parallel to the wound surface and so all the openings with the diminished Pressure are applied. The drainage tube can be doing this through the pores or between the fibers of the carrier layer extend through or between two layers of a multilayer carrier layer be included. Over the pores or through the fiber spaces then the applied negative pressure over the area evenly distributed and to the openings forwarded.

To an envisaged embodiment, the system for the Vacuum therapy also include a vacuum device, the applies the desired negative pressure to the wound. As a negative pressure can in particular 100 mbar to 950 mbar, in particular 600 be applied to 950 mbar.

Further Advantages and features result from the other application documents. The invention will be described in more detail below with reference to a drawing explained. Showing:

1a a plan view of a wound dressing according to the invention;

1b a section along the line AA in 1a ;

1c a section along the line BB in 1a ;

2 a perspective view of an embodiment of a wound dressing;

3a a plan view of an alternative embodiment of a wound dressing;

3b a section along the line AA in 3a ;

3c a section along the line BB in 3a ;

4 a perspective view of a wound dressing;

5a C further alternative designs in a detailed view; and

6 a negative pressure therapy system.

1a shows a part of a wound dressing, here the wound-facing side of a wound contact layer 2 is shown and the wound dressing in its entirety by the reference numeral 10 is marked. The wound contact layer 2 has surveys on her side facing the wound 4 over a base area 12 the wound-facing surface of the wound contact layer 2 on. The base area 12 is formed by the substantial areal extent of the wound-facing side. This base area 12 covers a larger proportion of the area than the surveys 4 , which stand out from it and forms thereby itself wells 7 together with the relief-like elevations 4 , Both elevations are on the wound-facing side of the wound contact layer 4 as well as depressions 7 intended. The surveys 4 are formed here like a lattice webs.

In the areas of the base area 12 the wound contact layer 2 in which no surveys 4 are provided and in which here the base area 12 as a depression 7 is formed opposite the relief-elevating elevations 4 , are openings 5 intended. The openings 5 are tapered, with the larger diameter on the wound facing side of the wound contact layer 2 is provided and in the direction of the wound-facing side of the wound contact layer 2 narrows the conicity. The openings 5 extend through the entire thickness of the wound contact layer 2 ,

Through the bars 4 are the openings 5 not in direct contact with a skin surface if the wound dressing is applied to a skin surface. The surfaces of the webs 4 serve as a contact surface 14 with a skin surface during application of the wound dressing. About the openings 5 For example, a reduced air pressure may be used to treat a wound, where the air pressure (absolute) may be between 100 and 950 mbar, which is less than the atmospheric pressure.

1b now shows a cross section along the line AA through a wound dressing according to 1a Here are the conical openings 5 as well as the footbridges 4 are shown. In addition to the wound contact layer, which is formed from a hydrous hydrogel, is a carrier layer 1 provided, which may preferably be formed from an absorbent nonwoven material or an absorbent foam. Between carrier layer 1 and wound contact layer 2 is a boundary and / or anchoring layer 3 provided by penetration of the material of the wound contact layer 2 in the carrier layer 1 is formed, with the openings 5 extend through the boundary or anchoring layer. A contact surface of the wound dressing with a skin surface, which in the representation below the contact surface 14 is provided, takes place only in the area of the webs 4 ,

1c now shows a section along the line BB, with the openings 5 in 1c do not lie in the cutting plane. 1c shows the surveys 4 over the base area 12 the wound contact layer, by the areal extent of the wound contact layer 2 is formed on the wounded side. In this case, the base area forms 12 at the same time the depressions ( 7 ) out.

In the following, the structure of the wound dressing will be explained in more detail using an exemplary embodiment. The wound dressing has the 1a to 1c described construction.

A) Preparation of the hydrogel

To prepare the hydrogel, the following aqueous solutions and components (component A, B, C) are used: Component A Propylene glycol USP30 (99.8%) Fa. Hedinger Aug. GmbH; Stuttgart, Germany 23.24% by weight Aqua purificata Water treatment plant 75.41% by weight NaCl, very pure, USP Fa. Hedinger Aug. GmbH; Stuttgart, Germany 1.35% by weight

To prepare the component A, the ingredients are combined and stirred until the salt is completely dissolved. Component A is cooled to 2 ° C. Component B Jeffamine ED-2003 Fa. Huntsman; Everberg, Belgium 52.5% by weight Aqua purificata Water treatment plant 47.5% by weight

To prepare the aqueous component B, the solid Jeffamine is melted at 50 ° C and added to the initially introduced water with stirring. Component B is cooled to room temperature. Component C Aquapol PI-13000-3 Fa. Carpenter; Richmond, USA 100.0% by weight

The Component C is brought to room temperature.

The Prepared components A, B, and C are in proportion 75.4: 14.0: 10.6 homogeneous by homogenization by means of a rotating mixing system and mixed in the provided Molds cast as free of bubbles as possible.

B) Preparation of the wound dressings

• 1. Als Trägerschicht 1 und hydrophobe Abdeckschicht 9 wird ein Laminat aus einem hydrophilen Faservlies und einem Polyethylennetz verwendet. Das Faservlies besteht aus einem Fasergemisch aus Viskosefasern, Polyesterfasern und thermoplastischen Fasern (Laminat LN 0074; Fa. Kemex, AL Almelo-Niederlande).
• 2. Zur Herstellung der Wundkontaktschicht 2 wird eine PTFE-Form mit profiliertem Grund bereitgestellt. Die Form weist eine Noppenstruktur mit kegelstumpfförmigen Noppen mit einem Sockeldurchmesser von 1,6 mm und einer Kegelspitzendurchmesser von 1,2 mm auf. Der Abstand zwischen zwei Noppen beträgt jeweils 5 mm, wobei die Noppen auf den Kreuzungspunkten eines Rechteckgitters liegen. Zwischen den Noppen sind Vertiefungen vorgesehen, die in der Wundauflage die Erhöhungen 4 der Wundkontaktschicht 2 bilden. Die Vertiefungen weisen einen quadratischen Querschnitt von 0,5 × 0,5 mm auf und bilden insgesamt ein Rechteckgitter von 5 × 5 mm, wobei jede Noppe auf der Mitte eines jeden Gitters angeordnet ist.
• 3. Das Hydrogel wird gemäß A) hergestellt und bereitgestellt, wobei das Hydrogel nach dem Durchmischen und Homogenisieren aufgrund der beginnenden Vernetzungsreaktion sofort weiterverarbeitet werden muss. Hierzu wird das Hydrogel in die bereitgestellten Formen möglichst blasenfrei gegossen.
• 4. Das Gel wird mit einem PTFE-Rakel so verteilt, dass die Gelschicht die Höhe der Noppen (1,2 mm) aufweist. Überschüssiges Gel wird aus der Form entfernt.
• 5. Nach ca. 3 Minuten wird das bereitgestellte Laminat aus Faservlies und hydrophoben Abdeckschicht mit der Faservliesseite auf die Geloberfläche gelegt. Das Laminat wird mit einem Druck von 330 N/m² angedrückt und gehalten.
• 6. Nach weiteren ca. 7 Minuten hat sich das Gel mit dem Faservlies verbunden, so dass das Laminat aus Faservlies und wasserhaltigen Hydrogel aus der Form entfernt werden kann. Es wurde eine 0,3 mm dicke Grenz- und/oder Verankerungsschicht 3 gebildet, die aus wasserhaltigem Hydrogel und Faservlies besteht.
• 7. Das Laminat wird mit der Hydrogelseite auf die vorbereitete Release-Folie gelegt (die silikonisierte Seite ist zum Gel gerichtet), so dass die zur Wunde gerichtete Seite geschützt ist.
• 8. Aus dem mehrlagigen Materialverbund werden Wundauflagen mit einer Kantenlänge von 10 × 10 cm ausgestanzt.

The wound dressings (samples) are made by hand according to the following procedure.

• 1. As a carrier layer 1 and hydrophobic cover layer 9 For example, a laminate of a hydrophilic nonwoven fabric and a polyethylene net is used. The fiber fleece consists of a fiber mixture of viscose fibers, polyester fibers and thermoplastic fibers (laminate LN 0074, Kemex, AL Almelo-Netherlands).
• 2. For the preparation of the wound contact layer 2 a PTFE mold with profiled ground is provided. The mold has a knobbed structure with frusto-conical nubs with a base diameter of 1.6 mm and a cone tip diameter of 1.2 mm. The distance between two nubs is 5 mm in each case, with the nubs lying on the crossing points of a rectangular grid. Wells are provided between the pimples, which increases in the wound dressing 4 the wound contact layer 2 form. The recesses have a square cross-section of 0.5 x 0.5 mm and form a rectangular grid of 5 x 5 mm in total, with each nub on the center of each grating.
• 3. The hydrogel is prepared and provided according to A), wherein the hydrogel must be processed immediately after mixing and homogenization due to the incipient crosslinking reaction. For this, the hydrogel is poured into the provided forms as free of bubbles as possible.
• 4. The gel is spread with a PTFE squeegee so that the gel layer has the height of the nubs (1.2 mm). Excess gel is removed from the mold.
• 5. After about 3 minutes, the provided laminate of non-woven fabric and hydrophobic cover layer with the non-woven fabric side is placed on the gel surface. The laminate is pressed and held at a pressure of 330 N / m ² .
• 6. After about another 7 minutes, the gel has bonded to the nonwoven fabric so that the nonwoven laminate and hydrous hydrogel laminate can be removed from the mold. It became a 0.3 mm thick boundary and / or anchoring layer 3 formed, which consists of hydrous hydrogel and non-woven fabric.
• 7. Place the laminate with the hydrogel side on the prepared release liner (the siliconized side faces the gel) so that the side facing the wound is protected.
• 8. Wound dressings with an edge length of 10 × 10 cm are punched out of the multilayer material composite.

The wound dressing thus produced has the 1a to 1c described structure, wherein with the figures no release liner and no hydrophobic network is shown.

2 shows a perspective view analog 1 , Here additionally on the side facing away from the wound layer of the carrier layer, a hydrophobic net material as a cover layer 9 made of a polyethylene. In addition, at 2 between the individual depressions through the webs 4 crossings 6 formed so that the areas of the recess 7 that go through the footprint here 12 be formed over the passages or channels 6 interconnected and thus in contact. This is particularly advantageous because it is achieved that the individual wells 7 in which the openings 5 are arranged to communicate with each other and so even when closing an opening 5 over the other openings 5 In this area, a reduced pressure can be applied, which serves for therapy.

3a now shows an alternative embodiment, in which case the base area 12 the surveys 4 train and the wells 7 are formed in the form of grid-like running channels, wherein in the intersections of the recesses 7 the openings 5 are arranged. Incidentally, the structure results from a carrier layer 1 , a boundary and / or anchoring layer 3 and the hydrous hydrogel layer 2 that the wound contact layer 2 forms, analogous to 1a , In this case also form the surveys 4 passing through the footprint 12 the wound contact layer 2 are formed, the contact surface 14 with a skin surface of a patient to whom the wound dressing is applied.

4 shows an analogous design, in which case the boundary and anchoring layer also with the reference numeral 3 is designated. Good are the channels with the arranged in the crossing points conical openings 5 to see. Also here was a hydrophobic net material, with the reference numeral 9 is provided, applied. Again, the openings 5 via the recesses formed as channels 7 communicate.

The 5a to c now show alternative configurations of the recesses formed as channels 7 with the arrangement of the corresponding openings 5 , This can be the openings 5 always be arranged at the intersection of the channels, wherein the channels can form a grid extending at right angles to each other, but also a grid, as in 5b is shown, in which the angles between the individual channels deviate from the right angle, so that a diamond-shaped arrangement of the channels with the points lying in the crossing point 5 results. Optionally, honeycomb channels may be provided with also arranged in the crossing points openings 5 ,

In principle, it can also be provided that the elevations form patterns which, according to the patterns of the channels in the 5a to 5c are formed, in which case in the region of the recesses 7 So in the surveys 4 enclosed areas, the openings 5 are provided.

6 shows a vacuum therapy system comprising a wound dressing 10 made of a hydrophobic cover layer 9 , which is formed in particular of a polyethylene mesh material, and a carrier layer 1 , a boundary and / or anchoring layer 3 and a wound contact layer 2 is formed. The carrier layer 1 consists of an absorbent nonwoven material and is with the cover layer 9 connected to a laminate. The manufacturing process of a corresponding wound dressing can be deduced from the exemplary embodiment described above.

In the wound dressing is now a drainage tube 30 inserted in such a way that it is parallel to the planar extension of the individual layers of the wound dressing 10 runs, wherein on the fibrous structure of the existing of a nonwoven substrate layer 10 the negative pressure via a pump 32 generated and by means of a facility 34 is applied to the drainage tube, on the openings 5 of the wound dressing 10 can be transmitted, since the negative pressure over the fiber interstices or the porosity of the carrier layer 1 evenly over the areal extent of the carrier layer 1 and thus over the areal extent of the wound contact layer 2 is distributed. About the openings 5 The negative pressure is then applied to a wound W of a patient's skin. To the wound dressing 10 To seal off as much as possible from pressure losses and from contact with the outside atmosphere, the wound dressing is as gas-tight as possible by means of a film 36 , which may be formed in particular by a PU film, at its edges, extending beyond the dimensions of the wound dressing 10 extend, may be adhesively coated on the skin of a patient. In the manner described above can be particularly simple negative pressure therapy be performed, the pressure acts as evenly as possible on the skin of the patient and when adding a single opening, these areas are preferably not cut off from the negative pressure, but are supplied via other openings continue with negative pressure.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 2005/123170 A1 [0002]
• - US 6979324 B2 [0004]
• WO 02/083046 A1 [0004]
• - EP 630029 A1 [0023]
• - EP 426422 A1 [0023]

Claims (13)

Wound dressing for negative pressure therapy comprising a carrier layer ( 1 ) and one on the wound-facing side of the carrier layer ( 1 ) applied wound contact layer ( 2 ), wherein the wound contact layer ( 2 ) transversely to its planar extent, the wound contact layer penetrating openings ( 5 ), characterized in that the wound-facing side of the wound contact layer ( 2 ) Surveys ( 4 ) and depressions ( 7 ) and the wound contact layer ( 2 ) only in the area of the surveys ( 4 ) a contact surface ( 14 ) forms with a skin surface. Wound dressing according to claim 1, characterized in that the elevations ( 4 ) and / or depressions ( 7 ) are regularly formed and in particular form a pattern. Wound dressing according to claim 2, characterized in that the pattern is a grid formed by the elevations ( 4 ) and / or depressions ( 7 ) is formed. Wound dressing according to one of the preceding claims, characterized in that the openings ( 5 ) in the area of the depressions ( 7 ) are arranged. Wound dressing according to one of the preceding claims, characterized in that the depressions ( 7 ) are formed so that the openings ( 5 ) are interconnected. Wound dressing according to one of the preceding claims, characterized in that the wound contact layer ( 2 ) comprises a hydrous gel and in particular consists of a hydrous hydrogel. Wound dressing according to one of the preceding claims, characterized in that the carrier layer ( 1 ) comprises an absorbent nonwoven material, an absorbent foam, a knit or knit fabric. Wound dressing according to one of the preceding claims, wherein the axis of the openings ( 5 ) perpendicular to the planar extent of the wound contact layer ( 2 ) runs. Wound dressing according to one of the preceding claims, characterized in that on the side facing away from the wound ( 1 ) a hydrophobic cover layer ( 9 ), in particular of a net material, in particular of a polyolefin is provided. Wound dressing according to one of the preceding claims, characterized in that between carrier layer ( 1 ) and wound contact layer ( 2 ) a boundary and / or anchoring layer ( 3 ) is provided, in particular the openings ( 5 ) also through the boundary and / or anchoring layer ( 3 ). A vacuum therapy system for wound treatment comprising a wound dressing according to any one of the preceding claims and a drainage tube which communicates with the openings in the wound dressing ( 10 ) cooperates to produce a reduced pressure at a skin surface. Vacuum therapy system according to claim 11, characterized in that the hose into the carrier layer ( 1 ) is inserted. Vacuum therapy system according to claim 11 or 12, characterized in that it comprises a vacuum device, the with the drainage tube to produce a reduced air pressure interacts.