EP2934410A1

EP2934410A1 - Suction element for the therapeutic treatment of a wound using negative pressure

Info

Publication number: EP2934410A1
Application number: EP13815733.4A
Authority: EP
Inventors: Pierre Croizat; Axel Eckstein; Cornelia Wolf
Original assignee: Paul Hartmann AG
Current assignee: Paul Hartmann AG
Priority date: 2012-12-21
Filing date: 2013-12-19
Publication date: 2015-10-28
Also published as: US20140221946A1; WO2014096229A1; DE102012025124A1; RU2015123754A

Abstract

The invention relates to a suction element for the therapeutic treatment of a wound on the human or animal body using negative pressure. In particular, the invention relate to a suction element for the therapeutic treatment of a wound, the surface of which comprises a sensitive tissue structure, said structure lying deeply in an uninjured body, using negative pressure. The tissue structure is a blood vessel or a nerve.

Description

Title: Absorbent for the therapeutic treatment of a wound by means of negative pressure

description

The invention generally relates to an absorbent body for the therapeutic treatment of a wound on the human or animal body by means of negative pressure. In particular, the invention relates to an absorbent body for the therapeutic treatment of a wound, which comprises on its surface a sensitive and deep tissue structure lying in the intact body, by means of negative pressure, wherein the tissue structure is a blood vessel or a nerve.

A wound is understood to mean the separation of the connection between tissues of the body shell in humans or animals. It can be associated with a loss of substance.

Devices for negative pressure therapy of wounds are known in the art. Thus, for example, W01993 / 009727 describes a device for promoting wound healing by the application of negative pressure on the skin area having the wound and surrounding the wound. The device according to W01993 / 009727 comprises a vacuum device for generating the negative pressure, an airtight cover of the wound designated as a sealing device, which is in a functional connection with the vacuum device, and a wound dressing designated as a protective device for positioning on the wound within the sealing device. In the

Protective device is an open-cell polymer foam,

for example, polyester foam. As described in W01993 / 009727, the use of negative pressure therapy can accelerate wound healing of different types of wounds such as burns, pressure sores or lacerations.

It is known from WO201 1/003521 that absorbent bodies loaded with a solution, which comprise a superabsorbent polymer, are suitable as wound dressings in the negative pressure therapy of wounds.

Devices for negative pressure therapy are commercially available, for example, the therapy system Vivano ^® the applicant Paul Hartmann AG (Germany). Both commercially available devices for negative pressure therapy of wounds is often a wound dressing of an open-cell polymer foam used. In practice, it has been found that wounds which comprise sensitive tissue structures lying deep in the intact body, in particular blood vessels or nerves, on their surface can only be treated unsatisfactorily with such devices since the risk of mechanical damage to the sensitive tissue structure can exist. Due to the effect of the negative pressure, the wound dressing is pressed against the wound base during the therapy. The resulting risk of mechanical damage to sensitive tissue structures arises especially in blood vessels and nerves.

Devices for negative pressure therapy of tissue structures deep in the intact body are known from the prior art. Thus, WO2010 / 078342 discloses a negative pressure therapy system for the treatment of damaged nervous tissue. The nerve is enveloped in the area of damage by a tube. In the space between the tube and the damaged nerve there is a material that can communicate with a vacuum source in a glide-conducting manner. The material can be resorbable and serve as a matrix for the formation of new nerve tissue. Similarly, WO 2010/078345 is directed to a negative pressure therapy system comprising a tube enclosing the damaged nerve and a tube

cylindrical body. The body is positioned radially to the tube and connected at one end in the region of the nerve defect with the tube, so that a negative pressure can be forwarded. The other end of the body is fluidly connected to a vacuum line. The cylindrical body serves as one of these

Connecting means (vacuum port).

WO 2010/078347 discloses a negative pressure therapy system in which the defective area of a damaged or severed nerve is enveloped by a tube. In order to promote the growing together of the nerve tissue, at least one element in the form of a hollow cone is located within the tube between the nerve endings as a framework material.

The systems known from WO2010 / 078342, WO 2010/078345 and WO 2010/078347 are thus in particular intended to apply a negative pressure specifically to a subcutaneous tissue defect, the body sheath covering the tissue defect being substantially intact. On the other hand, they are less suitable for wounds become, which are associated with a loss of substance of the body shell or the skin tissue and exposed in which sensitive and intact body deep-lying tissue structures such as blood vessels or nerves. The object of the present invention is to further improve the negative pressure therapy of wounds and to overcome the disadvantages of the prior art. In particular, the present invention has for its object to provide an improved wound dressing for the negative pressure therapy of wounds comprising exposed blood vessels or exposed nerves on their surface. The invention solves the problem with an absorbent body with the features of claim 1 or of claim 2 or with a device for negative pressure therapy of wounds with the features of claim 12.

Surprisingly, it has been found that an absorbent body which comprises a superabsorbent polymer is used as a wound dressing for the negative pressure therapy of a wound, which has a sensitive tissue structure deep in the intact body, which is a blood vessel and / or a nerve, on its surface includes, is suitable. During the negative pressure therapy, the absorbent body is brought into contact with the tissue structure, that is to say with the blood vessel and / or the nerve, so that the sensitive

Tissue structure is protected by the absorbent body until it is replaced by newly formed

Granulation tissue is covered. The protective effect and the therapeutic success is particularly pronounced when the absorbent body is subjected to a solution. In this particularly preferred embodiment, the absorption of the absorbent body always takes place before the wound therapy, for example by the manufacturer or immediately before the therapy by the user.

One advantage of the absorbent body acted upon by a solution is that immediately after the beginning of the therapy by delivery of the application solution, the sensitive tissue structure deep in the intact body is kept in a moist environment, whereby a rapid and successful

Wound healing is promoted. Further advantageous properties of the absorbent body acted upon by a solution are its soft structure and its low tendency to stick to the wound surface and / or to grow together. As a result, the sensitive blood vessels and / or the nerve tissue are spared and the pain for the patient due to the negative pressure therapy is reduced. Especially at the

Negative pressure therapy of a wound comprising nerve tissue on its surface may involve the use of a solution-loaded absorbent article superabsorbent polymer for reducing the pain for the

Contribute to patients.

By the absorbent body in exchange for discharged admission solution

Wound exudate absorbs and absorbs contained bacteria and other harmful components, can be counteracted wound infections and the

Wound healing favored.

According to a first aspect, the invention relates to an absorbent body comprising a superabsorbent polymer for the therapeutic treatment of a wound comprising on its surface a sensitive tissue structure lying deep in the intact body by means of negative pressure, the absorbent body preferably applying a solution, in particular Ringer's solution is. The tissue structure is a blood vessel and / or a nerve. In other words, the invention according to this first aspect comprises a product for the therapeutic treatment of a wound, wherein the product is an absorbent comprising a superabsorbent polymer and wherein the product is for use in the negative pressure therapy of a wound having on its surface a sensitive and in the intact body comprises low-lying fabric structure is used. The tissue structure is a blood vessel and / or a nerve. The product is preferably applied with a solution, in particular with Ringer's solution.

According to the first aspect, the invention also relates to the use of an absorbent body comprising a superabsorbent polymer, for the therapeutic treatment of a wound, which comprises on its surface a sensitive and deep-seated intact body tissue structure, by means of negative pressure, wherein the absorbent body

preferably with a solution, in particular with Ringer's solution, is acted upon. The tissue structure is a blood vessel and / or a nerve.

With regard to the substances used in the therapeutic treatment of wounds, the invention according to the first aspect therefore provides:

A superabsorbent polymer, for the therapeutic treatment of a wound, which comprises on its surface a sensitive tissue structure deep in the intact body, by means of negative pressure, wherein the superabsorbent polymer is contained in an absorbent body and wherein the absorbent body is preferably applied with a solution, in particular with Ringer's solution is. The tissue structure is a blood vessel and / or a nerve. Accordingly, according to the first aspect of the invention is also provided: The use of a superabsorbent polymer for the production of an absorbent body for use in the therapeutic treatment of a wound having on its surface a sensitive tissue structure deep in the intact body by means of negative pressure, the absorbent body preferably with a solution, in particular with Ringer's solution, is acted upon. The tissue structure is a blood vessel and / or a nerve.

The invention according to a second aspect comprises an absorbent body comprising a superabsorbent polymer for the therapeutic treatment of a wound by means of

Underpressure, wherein the absorbent during treatment with a sensitive and intact body deep-lying tissue structure is brought into contact at the surface of the wound to protect the tissue structure from mechanical stress, and wherein the absorbent preferably with a solution, in particular with Ringer solution applied is. The tissue structure is a blood vessel and / or a nerve. In other words, the invention according to this second aspect comprises a

A product for the therapeutic treatment of a wound, wherein the product is an absorbent comprising a superabsorbent polymer, and wherein the product is contacted with a delicate and intact-body tissue structure at the surface of the wound during a negative pressure therapy to contact the tissue structure to protect against mechanical stress. In the

Tissue structure is a blood vessel and / or a nerve. The product is preferably applied with a solution, in particular with Ringer's solution. According to the second aspect, the invention also relates to the use of an absorbent body comprising a superabsorbent polymer, for the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body is brought into contact with the surface of the wound during treatment with a sensitive tissue structure which is deeply embedded in the intact body, to protect the fabric structure from mechanical stress, and wherein the absorbent body preferably with a solution, in particular with Ringer's solution, is applied. The tissue structure is a blood vessel and / or a nerve.

Relative to the substances used in the therapeutic treatment of wounds, the invention according to the second aspect thus provides:

A superabsorbent polymer for the therapeutic treatment of a wound by means of negative pressure, wherein the superabsorbent polymer is contained in an absorbent body and wherein the absorbent during the treatment is brought into contact with a sensitive and intact body deep tissue structure at the surface of the wound to protect the tissue structure from mechanical stress, and wherein the absorbent body preferably with a solution, in particular with Ringer solution, is applied. The tissue structure is a blood vessel and / or a nerve.

Accordingly, according to the second aspect of the invention is also provided:

The use of a superabsorbent polymer for the preparation of an absorbent body for use in the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent during treatment with a sensitive and intact

Body deep tissue structure is brought into contact at the surface of the wound to protect the tissue structure from mechanical stress, and wherein the absorbent body preferably with a solution, in particular with Ringer's solution, is applied. The tissue structure is a blood vessel and / or a nerve.

Based on the abovementioned second aspect of the invention, the invention likewise encompasses an absorbent body comprising a superabsorbent polymer, for

therapeutic treatment of a wound by means of negative pressure, wherein the absorbent during the treatment to bring into contact with a sensitive and im

intact body deep-lying tissue structure at the surface of the wound

is provided to protect the fabric structure from mechanical stress, and wherein the absorbent body is preferably applied to a solution, in particular Ringer's solution. The tissue structure is a blood vessel and / or a nerve. In other words, the invention accordingly comprises a product for

therapeutic treatment of a wound, the product being a

Absorbent body comprising a superabsorbent polymer and wherein the product during a negative pressure therapy for bringing into contact with a sensitive and intact body deep-lying tissue structure at the surface of the wound, is provided to protect the tissue structure from mechanical stress. The tissue structure is a blood vessel and / or a nerve. The product is preferably applied with a solution, in particular with Ringer's solution.

The second aspect of the invention thus also relates to the use of an absorbent body comprising a superabsorbent polymer for the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body during the treatment for contacting with a sensitive tissue structure deep in the intact body provided on the surface of the wound is to make the tissue structure more mechanical To protect stress, and wherein the absorbent body is preferably applied with a solution, in particular with Ringer's solution. The tissue structure is a blood vessel and / or a nerve. Based on the substances used in the therapeutic treatment of wounds, the invention thus provides, based on the aforementioned second aspect:

A superabsorbent polymer for the therapeutic treatment of a wound by means of negative pressure, wherein the superabsorbent polymer is contained in an absorbent body and wherein the absorbent body is provided at the surface of the wound during the treatment for contacting a sensitive and intact body tissue structure to protect the fabric structure from mechanical stress, and wherein the absorbent body is preferably applied with a solution, in particular with Ringer's solution. The tissue structure is a blood vessel and / or a nerve.

Accordingly, based on the aforementioned second aspect of the invention is also provided:

The use of a superabsorbent polymer for the manufacture of an absorbent body for use in the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body is provided at the surface of the wound during treatment for contacting a delicate and intact body tissue structure to the tissue structure To protect against mechanical stress, and wherein the absorbent body preferably with a solution, in particular with Ringer's solution, is applied. The tissue structure is a blood vessel and / or a nerve.

According to a third aspect, the invention comprises an absorbent body comprising a superabsorbent polymer for the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body is used during the treatment to protect a sensitive and intact body deep tissue structure at the surface of the wound to the tissue structure To protect mechanical stress, so that the tissue structure of newly formed granulation tissue can be overgrown. The absorbent body is in this case preferably with a solution, in particular with

Ringer solution, charged. The tissue structure is a blood vessel and / or a nerve. In other words, the invention according to this third

Aspect of a product for the therapeutic treatment of a wound, wherein the product is a absorbent comprising a superabsorbent polymer, and wherein the product is used during a negative pressure therapy to protect a delicate and intact body deep tissue structure at the surface of the wound to protect the tissue structure from mechanical stress so that the tissue structure can be overgrown by newly formed granulation tissue. The tissue structure is a blood vessel and / or a nerve. The product is preferably applied with a solution, in particular with Ringer's solution.

According to the third aspect, the invention also relates to the use of an absorbent body comprising a superabsorbent polymer for the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body is used during the treatment to protect a sensitive tissue structure deep in the intact body at the surface of the wound protect the tissue structure from mechanical stress, so that the tissue structure of newly formed granulation tissue

can be overgrown, and wherein the absorbent body is preferably applied with a solution, in particular with Ringer's solution. The tissue structure is a blood vessel and / or a nerve.

Based on the substances used in the therapeutic treatment of wounds, the invention according to the third aspect thus provides:

A superabsorbent polymer for the therapeutic treatment of a wound by means of negative pressure, wherein the superabsorbent polymer is contained in an absorbent body and wherein the absorbent body is used to protect a delicate and intact body deep tissue structure at the surface of the wound during the treatment To protect mechanical stress, so that the tissue structure of newly formed granulation tissue can be overgrown, and wherein the absorbent body preferably with a solution, in particular with Ringer's solution, is applied. The tissue structure is a blood vessel and / or a nerve. Accordingly, according to the third aspect of the invention, it is also provided:

The use of a superabsorbent polymer for the manufacture of an absorbent for use in the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body is used during the treatment to protect a delicate and intact body deep tissue structure at the surface of the wound against the tissue structure from mechanical stress so that the tissue structure can be overgrown by newly formed granulation tissue, and wherein the absorbent body is preferably filled with a solution, in particular with Ringer's solution, is charged. The tissue structure is a blood vessel and / or a nerve.

In the context of the present invention, the absorbent body and the superabsorbent polymer contained therein are claimed in connection with the specific application in a method of therapeutic treatment (specific medical indications). A specific application in a method of therapeutic

Treatment (specific medical indication) in the context of the present invention is the treatment of a wound by means of negative pressure, wherein the wound on its surface has a delicate tissue structure in the form of a deep-seated tissue in the intact body

Blood vessel and / or nerve according to the definitions taken in the present document. Here is the effect of the absorbent body and contained therein

superabsorbent polymer, in particular, to protect the tissue structure from mechanical stress during treatment, so that the tissue structure can be overgrown by newly formed granulation tissue, for which the absorbent body with the superabsorbent polymer contained therein is preferably brought into contact with the tissue structure and preferably with a tissue structure Solution is applied. Another specific application in a method of therapeutic treatment (specific medical indication) in the context of the present invention is the protection of a sensitive tissue structure in the form of a deep-seated tissue in the intact body

Blood vessel and / or nerve according to the definitions given in the present document on the surface of a wound, which is treated with negative pressure, before mechanical stress, so that the tissue structure can be overgrown by newly formed granulation tissue, for which the absorbent body with the therein contained

superabsorbent polymer is preferably brought into contact with the fabric structure and is preferably applied to a solution.

In a fourth aspect, the invention includes a device for negative pressure therapy of wounds. The device comprises an air-impermeable cover material with which the wound is sealed airtight. The device further comprises a means for the functional connection of the wound space with a vacuum source located outside the covering material. Thus, a negative pressure in the wound room can be produced and liquids can be sucked out of the wound space. Furthermore, the device comprises at least one absorbent body comprising a superabsorbent polymer, for

Therapeutic treatment of a wound by means of negative pressure according to one of

the aforementioned aspects of the invention, which is in the space between the surface of the wound and the cover material can be introduced or introduced. Alternatively, the Apparatus comprising a product for the therapeutic treatment of a wound, wherein the product comprises an absorbent body comprising a superabsorbent polymer, according to one of the aforementioned aspects of the invention

superabsorbent polymer according to one of the aforementioned aspects of the invention. The absorbent body or the product is preferably applied with a solution, in particular with Ringer's solution.

As a further aspect, the present invention includes a method for use in negative pressure therapy of wounds. This method comprises the steps of a) introducing a absorbent body comprising a superabsorbent polymer into a wound, which has on its surface a sensitive tissue structure lying deep in the intact body, the tissue structure being a blood vessel and / or a nerve,

b) closing the wound by means of an air-impermeable covering material, so that a wound space is formed between the surface of the wound and the covering material, which encloses the absorbent body,

c) attachment of a means for the functional connection of the wound space with a

Outside the cover material located vacuum source, so that a negative pressure in the wound room can be produced and liquids are sucked out of the wound space, wherein the absorbent body is preferably subjected to a solution, in particular Ringer's solution. The absorbent body is preferably brought into contact with the tissue structure at the surface of the wound, ie with the blood vessel and / or with the nerve.

In a preferred embodiment, the method for use in the negative pressure therapy of wounds comprises a further step in which a pressure distribution layer is introduced into the wound. Overall, in this preferred embodiment, the method comprises the following steps: a) introducing a absorbent body comprising a superabsorbent polymer into a wound comprising on its surface a delicate tissue structure lying deep in the intact body, the tissue structure being a blood vessel and / or or is a nerve,

b) introducing a pressure distribution layer, preferably a pressure distribution layer comprising a foam, particularly preferably a pressure distribution layer comprising an open-cell polyurethane foam, into the wound, c) sealing the wound by means of an air-impermeable covering material, so that a wound space is formed between the surface of the wound and the covering material, which comprises the absorbent body and the pressure distribution layer,

d) attachment of a means for the functional connection of the wound space with a

Vacuum source located outside the cover material, so that a negative pressure in the wound space can be produced and liquids are sucked from the wound space, wherein the absorbent body preferably with a solution, in particular with Ringer solution, is applied and preferably with the tissue structure on the surface of the wound, ie with the Blood vessel and / or with the nerve, is brought into contact, and wherein the pressure distribution layer is preferably arranged between the absorbent body and the cover material.

A further method for use in the negative-pressure therapy of wounds can be followed by the methods mentioned, which comprises the following steps: a) introducing a wound dressing, preferably a wound dressing comprising a wound dressing

Foam, particularly preferably a wound dressing comprising an open-celled polyurethane foam, into a wound,

b) sealing the wound by means of an air-impermeable covering material, such that a wound space which comprises the wound dressing forms between the surface of the wound and the covering material,

Vacuum source located outside the cover material, so that a negative pressure in the wound space can be produced and liquids are sucked out of the wound space, the wound on its surface preferably comprising no exposed blood vessels and / or no exposed nerve tissue. The method may optionally include

Include split skin transmission.

The absorbent according to the invention comprises a superabsorbent polymer. A superabsorbent polymer is generally understood to be a water-insoluble swellable polymer which can take many times its own weight of liquid, such as water, saline solutions or body fluids. The fluid intake leads to the formation of a hydrogel. The clean water capacity is typically higher than the saline liquid capacity. In the context of this invention, the term superabsorbent polymer is in particular a Polymer, which according to the standard test method WSP 240.2 (05) has a w value ("free swell capacity") of at least 10 g / g, preferably at least 20 g / g. Test Method WSP 240.2 (05) for determining the w-value is described in "Standard Test Methods for the Non-Wovens and Related Industries", Edition 2008 (edited by "EDANA, International Association Serving the Nonwoven and Related Industries", Cary, NC, USA and "INDA, Association of the Nonwovens Fabrics Industry", Brussels, Belgium). WSP 240.2 (05) according to EDANA is a standard test method for

Determination of the w value ("free swell capacity") of superabsorbent polyacrylate powder. According to WSP 240.2 (05), the free uptake capacity for a 0.9 weight percent saline solution is determined. In the context of the present invention, the determination of the w-value of superabsorbent material which is not polyacrylate powder is carried out in a corresponding manner.

The superabsorbent polymer may preferably be in the form of particles or fibers.

The wounds contemplated by the present invention are wounds on the human or animal body which comprise one or more delicate tissue structures deep in the intact body, the tissue structure being a blood vessel and / or a nerve or a nerve is a nerve tissue. Sensitive in the context of the present invention means that the tissue structure during the negative pressure therapy is exposed to a particularly high risk due to mechanical stress. This is especially the case with blood vessels and nerves. A mechanical stress during the

Negative pressure therapy can be especially helpful in covering a sensitive

Tissue structure with a comparatively hard and rigid wound dressing, for example, from a foam occur. A mechanical stress can also occur when changing a wound dressing, with which the sensitive tissue structure is adhered and / or fused. The aforementioned mechanical stresses can lead to damage to the sensitive tissue structure. In the context of the invention, "deep-seated in the intact body" is to be understood as meaning that the tissue structure in the intact or non-wounded state of the human or animal body is localized in or underneath the subcutis The sensitive tissue structure to be protected by the absorbent body according to the invention the blood vessel and / or the nerve is located, for example due to a

Injury or due to surgery, on the surface of the wound and is covered by no further layer of tissue, which in the context of the present invention is also referred to as "exposed." Wounds with sensitive tissue structures deep in the intact body at the surface can be damaged, for example, by mechanical trauma, burns, metabolic or Circulatory disorder or caused by a pressure ulcer.

The absorbent body according to the invention is intended to protect the sensitive tissue structure (blood vessel and / or nerve), which lies deep in the intact body, from mechanical stress during the negative-pressure therapy. For this purpose, the absorbent body according to the invention is particularly suitable when it has been subjected to a solution and a textile shell, which is preferably non-elastically extensible in the longitudinal, transverse, and diagonal direction comprises.

The absorbent body according to the invention is brought into direct or indirect contact with the sensitive tissue structure which is located deep in the intact body, wherein the tissue structure is a blood vessel and / or a nerve. Indirect contact may be present when a wound contact layer is introduced between the tissue structure and the absorbent body. It must be ensured that the

Wound contact layer does not mechanically stress the tissue structure.

Furthermore, it is advantageous if the tissue structure to be protected against mechanical stress is completely covered by the absorbent body. Depending on the size of the tissue structure to be treated and the size of the absorbent body have this one

Absorbent body or multiple absorbent bodies are used. The application of several absorbent bodies may also be necessary if the wound surface is a

Variety of areas with exposed blood vessels and / or exposed nerve tissue includes. Each individual area, which comprises a sensitive tissue structure, should then be brought into contact with at least one absorbent body and thereby protected against mechanical stress.

Preferably, the tissue structure to be protected, that is to say the exposed blood vessel and / or the exposed nerve, is essentially the same as that according to the invention

Suction body covered. In addition, a pressure distribution layer can be introduced between the wound surface and covering material. However, it is also possible that the

Wound space, so between the wound surface and covering material available

Interspace, filled only by one or more absorbent bodies. According to the invention, the sensitive tissue structure lying deep in the intact body is a blood vessel exposed as a result of the wound and / or an exposed nerve (also referred to as nerve tissue). The delicate and undamaged body deep tissue structure must not be completely exposed here. In most cases, the tissue structure is only partially exposed instead.

Particularly preferably, the sensitive tissue structure lying deep in the intact body has no defects or tissue damage. Under a defect or

Tissue damage is understood to mean the absence of a portion of the delicate tissue structure deep within the intact body.

Whether the sensitive and intact body deep-lying tissue structure at the surface of the wound, so the blood vessel and / or the nerve, before mechanical

Stress during the negative pressure therapy by means of the invention

Absorbent body must be protected, can be assessed by the attending physician, usually a doctor in the field of wound treatment, usually based on the respective wound situation. A protection or a protection of the sensitive tissue structure deep in the intact body may be necessary in particular if the tissue structure has an area of at least 1 cm ² , preferably

at least 2 cm ² , more preferably at least 3 cm ² , occupies. If the attending physician wishes to approximate the area of the tissue structure at the wound surface, a suitable square grid film may be applied to the wound surface. The outline of the fabric structure whose area is to be determined is transferred to the film. Then the area can be determined by the point counting method. The point counting method is described in detail in the article "What has not been documented, is not provided" (Hoppe et al, The Nurse's Sister, Volume 45, 1 1/06).

Preferably, the absorbent body is brought into contact with the sensitive tissue structure for at least 6 hours, more preferably for at least 1 day, most preferably for at least 2 days. As a rule, the absorbent body according to the invention is not brought into contact with the sensitive tissue structure lying deep in the intact body for more than 4 days, preferably not more than 3 days. Thereafter, the absorbent body can be changed and the negative pressure therapy continued, preferably until the blood vessel and / or the nerve is no longer freely present in the wound, that is no longer located on the surface of the wound. Until this time, a repeated replacement of the absorbent body may be required. As soon as the sensitive tissue structure, which lies in the intact body, is no longer present on the surface of the wound but is covered by newly formed tissue, the negative pressure therapy can optionally using other dressings and supplementary surgical

Measures such as a split skin graft - to be continued. It is also possible to connect to the method proposed here for negative pressure therapy further standard medical wound treatment procedures without the use of negative pressure. A combination of medically appropriate follow-up therapies is also possible. Suitable connection therapies are known to the person skilled in the art from the prior art, for example from the already mentioned WO1993 / 009727. A suitable

Connection therapy can also be to use a suction body as used in the present invention without the use of negative pressure as a wound dressing. Such a connection therapy will be in the as yet unpublished European

Patent applications with the application numbers 12006687.3 and 12006688.1 described.

According to a preferred embodiment of the invention, the superabsorbent polymer is a superabsorbent polyacrylate. In the context of the present invention, polyacrylate is understood as meaning a synthetic polymer comprising as monomer (M1) acrylic acid (2-propenoic acid, CH ₂ = CH-CO ₂ H) and / or a salt thereof. The monomer content is in particular more than 70% by weight of acrylic acid and / or a salt thereof (based on the total weight of the polyacrylate).

Preferably, polyacrylates according to the invention have a monomer content of more than 80% by weight of acrylic acid and / or a salt thereof, and more preferably more than 95% by weight of acrylic acid and / or a salt thereof based on the total weight of the polyacrylate. In this case, the polyacrylate as homopolymer,

Copolymer or block polymer. If the polyacrylate as a copolymer or

In each case, the monomer content of the monomer M1 in the polymer is more than 70 percent by weight, in particular more than 80 percent by weight and very particularly preferably more than 95 percent by weight based on the

Total weight of the polyacrylate. In these copolymeric polyacrylates or block polymer polyacrylates in addition to the monomer M1 as comonomers M2 in particular α, β-unsaturated ethers (vinyl ethers), α, β-unsaturated carboxylic acids or α, β-unsaturated carboxylic acid esters (vinyl esters) may be included. Of the comonomers M2 of the α, β-unsaturated carboxylic acids, especially methacrylic acid (2-methylpropenoic acid), ethacrylic acid (2-ethylpropenoic acid), crotonic acid (2-butenoic acid), sorbic acid (trans-trans-2,4-hexadienoic acid), maleic acid (c / s-2-butenedioic acid) or fumaric acid (trans-2-butenedioic acid). However, it can also be provided that the polyacrylate of a) a homopolymer of acrylic acid and / or b) a copolymer of i) acrylic acid and a salt of acrylic acid, ii) of methacrylic acid and a salt of methacrylic acid or iii) of acrylic acid and methacrylic acid and their salts. But it can also be be provided that it is the polyacrylate is a mixture of different polyacrylates.

In order to achieve in the absorbent body advantageous for the wound treatment pH in the range of about pH 4.0 to pH 8.5, in particular between pH 5.0 and 6.0, the polyacrylate is preferably present as a partially neutralized polymer, in particular the degree of neutralization should be between 20% and 90%, more preferably between 45% and 80%. Furthermore, it has been shown that particularly advantageous effects can occur for wound healing if the absorbent body comprises a mixture of polyacrylate particles, wherein the particle mixture contains polyacrylate particles of different sizes, characterized in that the particle mixture a) contains 5 to 100% by weight, preferably 5 to 98 wt .-%, particles having a particle size x with x <300 μηη, and b) 0 to 95 wt .-%, preferably 2 to 95 wt .-%, particles having a particle size x with x> 300 μηη,

contains.

With regard to further polyacrylates which can be used in a particularly advantageous manner for the present invention and mixtures of polyacrylate particles, reference is made to the polyacrylates and particle mixtures disclosed in WO2009 / 068249.

The particle size is determined in the context of the present invention analogously to EDANA 420.2-02, wherein the sieves (diameter 200 mm) have the information corresponding hole sizes. In addition, sieves with other hole sizes such as 125 μηη, 160 μηη, 630 μηη, 900 μηη, and 1500 μηη can be used. Here are dry polyacrylate particles with a

Moisture content of less than 10 wt .-% water based on the

Total weight of the particles is based, the moisture content is determined according to EDANA 450.2-02. The absorbent body may comprise, in addition to the superabsorbent polymer, which is preferably a superabsorbent polyacrylate, a carrier material, wherein the carrier material comprises a hydrophilic fiber material. Here you can as hydrophilic fiber material in particular water-insoluble fibers of cellulose, in particular largely delignified technical pulp fibers, in particular

Wood pulp fibers, in particular with a fiber length of <5 mm find use. The fibrous material may also be hydrophilic fibrous material of regenerated cellulose,

Carboxymethylcellulose, carboxyethylcellulose, hydroxymethylcellulose or

Hydroxyethyl cellulose contain. It may also be a fiber blend of cellulose, regenerated cellulose, carboxymethylcellulose, carboxyethylcellulose,

Hydroxymethylcellulose or hydroxyethylcellulose fibers and fibers of polyethylene, polypropylene or polyester may be provided.

In a preferred embodiment of the invention, the absorbent body comprises a

superabsorbent polymer as well as a carrier material a mixture of cellulose fibers and polypropylene fibers. These fibers can be processed into a layer together with the superabsorbent polymer in a so-called Air-Iaid process.

Furthermore, according to a preferred embodiment of the invention, the absorbent body is an absorbent body surrounded by a textile sheath. The shell is at least partially liquid permeable and the superabsorbent polymer is disposed therein. In other words, the superabsorbent polymer is surrounded by the shell. The shell may consist of a single material or comprise multiple materials. The sheath can in particular consist of an interlock knit

Polypropylene fibers exist.

In a particularly preferred embodiment of the invention is an absorbent body comprising a textile shell of an interlock knitted fabric

Polypropylene fibers in which a superabsorbent polyacrylate, cellulose and

Polypropylene fibers are arranged. In this case, the superabsorbent polyacrylate particles and the cellulose and polypropylene fibers are processed within the envelope by a Air-Iaid process into a layer. Such a product is commercially available under the name TenderWet ^® (Paul Hartmann AG, Germany).

A particularly suitable soft and plastically deformable absorbent body is obtained, in particular, when its sheath at least partially consists of a textile surface which is non-elastically extensible in the longitudinal, transverse and diagonal directions. In this

Reference is made to EP0594034B1. One of several suitable methods for welding thermoplastic sleeves is the Ultrasonic welding. The absorbent body may, for example, have a round, rectangular or oval shape. However, other forms are conceivable.

The absorbent body can have different amounts of superabsorbent polymer and carrier material. Preferably, the absorbent body contains at least 10

Weight percent polyacrylate (based on the carrier material). However, particularly preferred are absorbent bodies which comprise at least 20 percent by weight, in particular at least 25 percent by weight and very particularly preferably at least 30 percent by weight polyacrylate (based on the support material). However, in order not to limit the absorbent with respect to the supply and discharge of aqueous liquids, it should be ensured that the content of polyacrylate with respect to the carrier material is preferably not more than 90% by weight and in particular not more than 75% by weight.

In a preferred embodiment of the invention, the absorbent body is subjected to a solution. The application is preferably to saturation and preferably with an aqueous solution which swells the superabsorbent polymer and turns it into a gelatinous state. The aqueous solution is preferably saline. The aqueous solution is further a synthetic solution, which is to be understood as meaning that the solution is prepared in a technical manner and does not include body fluids or body-separated fluids such as wound exudate. The solution used for the application can be delivered by the absorbent body during the negative pressure therapy, wherein the solution is only partially removed irreversibly from the wound space by the applied negative pressure. In exchange for delivered pressurizing solution, the absorbent may optionally absorb wound exudate and absorb bacteria and other harmful components contained therein, which counteract wound infection and further promote wound healing.

In a further preferred embodiment of the invention, the absorbent is at least 500 weight percent, based on the weight of the dry absorbent body, the solution applied. The absorbent can, for example, with at least 600

Percent by weight, at least 800 weight percent or at least 1000

Be exposed to percent by weight of an aqueous solution, based on the weight of the dry absorbent body. Furthermore, the absorbent body is preferably applied with less than 5000 weight percent, less than 3500 weight percent or less than 2500 weight percent of an aqueous solution. In a particularly preferred embodiment of the invention, the absorbent body contains that amount of an aqueous solution which corresponds to its maximum absorption capacity for Ringer's solution. The maximum uptake capacity for Ringer's solution can be determined according to the aforementioned test method WSP 240.2 (05), but a) instead of the saline solution used in WSP 240.2 (05) Ringer solution is used and b) instead of the sealed in a shell test substance ("Bag" according to Section 6.1 of WSP 240.2 (05)) of the absorbent body according to the invention is used. The maximum absorption capacity corresponds to the gravimetrically determined weight difference between the dry absorbent body and the applied absorbent body, wherein a deviation of the weight difference by up to 15% is included above or below.

Preferably, the aqueous solution contains more than 50, for example more than 70, more than 80, more than 90 or 100 volume percent water. It may contain at least 5 mmol / l of sodium ions, at least 0.1 mmol / l of potassium ions, at least 0.1 mmol / l of calcium ions and / or at least 5 mmol / l of chloride ions. Optionally, the aqueous solution contains further inorganic cations and / or anions, optionally organic anions, and optionally additions of bioorganic compounds. The pH is preferably 4 to 9. The viscosity at 20 ° C is preferably between 0.8 mPa-s and 150 mPa-s. The viscosity of the solution is with a

Brookfield viscometer determined (unit: 1 Pa-s = 1 Ns / m ² ).

According to a particularly preferred embodiment of the invention, the solution is a synthetic, aqueous solution, in particular Ringer's solution. By a Ringer's solution is meant an approximately to the blood iso-osmotic synthetic solution comprising sodium chloride, potassium chloride and calcium chloride dissolved in distilled water. Preferably, the Ringer solution contains 147 mmol / l sodium ions, 4.0 mmol / l potassium ions, 3.0 mmol / l calcium ions and 157 mmol / l chloride ions, whereby a deviation of the respective ion concentration from the specified value by 5% is possible ,

In a further embodiment of the invention, the absorbent body, for example as an alternative or in addition to the aqueous solution described above, a

include antimicrobial substance. Preferably, the antimicrobial substance is or comprises a substance with antimicrobial activity, which is present in cationic form at pH values of from 4 to 7.5, for example substances having amino or imino groups. The cationic antimicrobial substance may be antimicrobial Metal cations act, in particular around silver cations, for example around a complex of 1-vinyl-2-pyrrolidone with silver cations. Particularly suitable cationic substances with antimicrobial action are biguanide derivatives such as chlorhexidine or polybiguanides, such as polyethylene biguanide (PEB), polytetramethylene biguanide (PTMB) or polyethylene hexamethylene biguanide (PEHMB). A particularly preferred polybiguanide is polyhexamethylene biguanide (PHMB or polyhexanide). Other suitable cationic substances with antimicrobial activity are polyguanidines such as polyhexamethyleneguanidines (PH MG), / V-octyl-1 - [10- (4-octyliminopyridin-1-yl) decyl] pyridin-4-imine (octenidine), quaternary ammonium compounds how to

For example, benzalkonium chloride or cetylpyridinium chloride, triazines such as 1- (3-chloroallyl) -3,5,7-triaza-1 -azoniaadamantane chloride or the ammonium compound taurolidine.

The device according to the invention comprises a covering material for airtight sealing of the wound. By "airtight sealing" is not to be understood here that no gas exchange takes place between the wound space and its surroundings. Rather, "airtight closing" in this context means that, taking into account the vacuum pump used, the vacuum necessary for the negative pressure therapy of wounds can be maintained. It is therefore also possible to use covering materials which have a slight gas permeability, as long as the negative pressure necessary for the negative pressure therapy can be maintained.

The airtight cover material may be in the form of, for example, a shell made of a solid material or in the form of a flexible film. Also conceivable are combinations of fixed frames or support plates with flexible films. In a preferred embodiment of the invention, the covering material for airtight sealing of the wound comprises a water-insoluble polymer or a metal foil.

In a particularly preferred embodiment of the invention, the water-insoluble polymer is polyurethane, polyester, polypropylene, polyethylene, polyamide or polyvinyl chloride, polyorganosiloxane (silicone), or a mixture thereof. The person skilled in the art is familiar with further suitable polymeric film materials.

As cover material and finished products can be used which have the aforementioned properties. As a particularly suitable covering material for the device according to the invention has Hydrofilm ^® polyurethane film (Paul

Hartmann AG, Germany) or Visulin ^® (Paul Hartmann AG, Germany) were found. The cover material is secured in the wound environment or on the wound edge so that an airtight wound closure is ensured. It may be expedient if the cover material is fully self-adhesive or has a self-adhesive edge. Alternatively, attachment and sealing can be done, for example, with an adhesive film, with a liquid adhesive or with a sealing compound. However, it is also possible that the covering material is held only by the negative pressure generated during the vacuum treatment at the wound. In a preferred embodiment of the invention, the covering material comprises a film of one or more water-insoluble polymers, the film being fully self-adhesive or having a self-adhesive edge.

The device according to the invention for the negative pressure therapy of wounds furthermore comprises a means for the functional connection of the wound space with an outside of the wound space

Covering located vacuum source, so that a negative pressure in the wound room can be produced and liquids are sucked from the wound room.

The term "negative pressure in the wound space" in the context of the invention means a reduced air pressure within the wound dressing compared to the ambient air pressure (atmospheric air pressure). By "within the wound dressing" is meant the space formed by the covering material and the wound. "Negative pressure" is often referred to as "negative pressure". The pressure difference between the air pressure within the wound dressing and the

Ambient air pressure is given in the context of the invention in mm Hg (millimeter mercury column), since this is common in the field of negative pressure therapy. 1 mm Hg corresponds to a torr or 133.322 Pa (Pascal). In the context of the invention, the negative pressure, i. the pressure difference between the air pressure within the wound dressing and the ambient air pressure, expressed as a positive value in mm Hg.

In one embodiment of the invention, the negative pressure is a negative pressure of at most 250 mmHg. This negative pressure range of at most 250 mmHg has proven to be suitable for wound healing. In a preferred embodiment of the invention, the negative pressure is a negative pressure of at least 10 mm Hg and at most 150 mm Hg. As is well known in the art, the vacuum may be a constant or time varying vacuum.

The functional connection can be made for example with a connecting line or with a vacuum fitting. Vacuum fittings are known in the art as "port".

In one embodiment of the invention, the means for the functional connection of the wound space with a located outside of the covering material

Low pressure source around at least one connecting line. The at least one

Connecting line can be passed through the cover material. Alternatively, the at least one connecting line can be carried out under the edge of the covering material. In both cases, the passage point must be hermetically sealed, so that the desired negative pressure in the dressing can be maintained. As a sealant, for example, an adhesive film, an adhesive, or an adhesive strip is suitable.

The connection line can be, for example, a hose, a pipe or another body with a cavity. A suitable tube is, for example, a silicone drainage tube.

The connecting line is expediently at the end, which is located outside the wound dressing, via a vacuum adapter to the other

Components of the vacuum system to be connectable. The connection line has an opening at the end, which is located within the wound dressing.

In another embodiment of the invention, the means for operatively connecting the wound space to a source of negative pressure external to the covering material is a negative pressure fitting (port) which can be fixed to one of the inside or outside of the covering material, the

Covering material has suitable openings. Also in this embodiment, attention must be paid to an airtight seal either the passage opening (port inside) or the support surface (port outside). The seal can be made for example with an adhesive film, with an adhesive, or with an adhesive strip. It is also conceivable that the port itself has corresponding fastening devices, such as adhesive surfaces. Suitable vacuum fittings are commercially available. These are typically vacuum fittings, which are on the outside of the

Covering be attached. Also has the vacuum connector

suitably via a vacuum adapter in order to be connectable to the other components of the vacuum system.

In a preferred embodiment of the invention, covering material and the means for the functional connection of the wound space with a vacuum source located outside the covering material are already provided ready for use connected to each other. It is very particularly preferred that this embodiment contains a film of one or more water-insoluble polymers which has a self-adhesive edge, since this arrangement substantially facilitates the application of the dressing.

In a preferred embodiment of the invention, the device for

Underpressure therapy further comprises at least one pressure distribution layer, which is introduced or introduced between the absorbent body and the covering material. The advantage of an additional pressure distribution layer may be that the pressure exerted by the dressing on the wound base is reduced by the use of the pressure distribution layer

Pressure distribution layer is even more evenly distributed. Furthermore, the

Pressure distribution layer store additional wound exudate or further improve the suction of the wound exudate from the wound room.

The additional pressure distribution layer may consist of an open-cell or semi-open-cell foam, a spacer fabric, a textile layer, a structured gel, or a permeable non-woven layer. The open-cell or semi-open-cell foam may be polyvinyl alcohol foam,

Silicone foam or polyurethane foam act. Suitable textile layers include ES compresses or lattice grommets. The additional pressure distribution layer may be configured to pass liquid such as wound exudate through it. For this purpose, the pressure distribution layer may contain suitable channels or openings, or consist of a material permeable to liquids. The additional

Pressure distribution layer may be adhesively or non-adherently bonded to the absorbent body. It can also be separated from the absorbent body by a further layer, for example a layer of a textile layer.

In a preferred embodiment of the invention, the device for

Underpressure therapy further comprises at least one wound contact layer which is between the Surface of the wound and the pressure distribution layer and / or between the surface of the wound and the absorbent body is introduced or is introduced. The additional wound contact layer may be adhesively or non-adhesively bonded to the absorbent body or the pressure distribution layer. The device for negative pressure therapy may also comprise several wound contact layers of possibly different materials.

In principle, any wound contact layer known from the prior art is suitable as the wound contact layer, as long as the material has no tendency to coalesce or adhere to the wound tissue. The wound contact layer may be, for example, an open-cell or semi-open-cell foam, in particular

Polyurethane, a hydrocolloid, a structured gel, a polyorganosiloxane (silicone), a permeable non-woven layer or a lattice grating act. The permeable non-woven layer or grille preferably consists of a hydrophobic material,

for example, polyester or polyamide, and may further be provided with an ointment. The wound contact layer can also consist of a bioresorbable material as known from DE19609551 or from WO02 / 072163. It is also possible that the wound contact layer an antimicrobial coating, for example a

Silver coating, or the wound healing promoting substances such as growth factors includes. Suitable commercially available wound contact layers are for example the ointment of Hydrotul ^® brand Atrauman ^® and Atrauman Ag ^® (Paul Hartmann AG, Germany).

In a particularly preferred embodiment of the invention, the device for negative pressure therapy comprises at least one wound contact layer which is introduced between the surface of the wound and the pressure distribution layer.

In the negative-pressure therapy of a wound, which comprises on its surface a deep-seated blood vessel in the intact body, it may be advantageous to apply a fluid-impermeable wound contact layer between the blood vessel and the absorbent body to damage the vessel or a suction of blood from the vessel to avoid by the negative pressure. According to another particularly preferred

Embodiment of the invention, the device for negative pressure therapy therefore comprises at least one fluid-impermeable wound contact layer, which is introduced between the blood vessel and the absorbent body. characters

Below, the absorbent body according to the invention and the device according to the invention for negative pressure therapy of wounds will be explained in more detail with reference to drawings. However, the invention should not be understood as being reduced to the embodiments shown in the drawings or in the description of the drawings. Rather, the invention also includes combinations of the individual features of the alternative forms.

Figure 1 shows an embodiment of the device according to the invention for

Negative pressure therapy of wounds (schematic side view).

FIG. 2 shows a further embodiment of the device according to the invention for negative pressure therapy of wounds, wherein the device comprises a pressure distribution layer (schematic side view).

FIG. 3 shows a further embodiment of the device according to the invention for negative pressure therapy of wounds, wherein the device comprises a pressure distribution layer (schematic side view). FIG. 4 shows a further embodiment of the device according to the invention for

Vacuum therapy of wounds, wherein the device comprises a pressure distribution layer and a wound contact layer (schematic side view).

FIG. 5 shows a further embodiment of the device according to the invention for negative pressure therapy of wounds, wherein the device comprises a pressure distribution layer and a wound contact layer (schematic side view).

Figure legend 1 air-impermeable cover material

2 surface of the wound

3 sensitive and deep tissue structure in the intact body

4 absorbent body comprising a superabsorbent polymer

5 wound space

6 wound environment

7 negative pressure fitting (port)

8 connecting line (hose) 9 collection vessel

10 negative pressure unit

1 1 pressure distribution layer

12 wound contact layer

Description of the figures

Figure 1 shows an embodiment of the device according to the invention for

Negative pressure therapy of wounds. The device comprises an air-impermeable

Covering material (1) for airtight sealing of the wound and the wound environment (6), a means (7) for the functional connection of the wound space (5) with a vacuum source (10) located outside the covering material (1), and several, each of a textile Enclosed absorbent body (4), each comprising a superabsorbent polymer. The wound comprises on its surface (2) a part of a blood vessel (3) which has been brought into contact with one of the absorbent bodies (4). The blood vessel (3) is a sensitive and deep-seated in the intact body

Tissue structure. The absorbent bodies (4) are placed in the wound space (5) so that as few cavities as possible and good contact with the wound surface (2) and in particular with the exposed blood vessel (3) is ensured. The number of absorbent bodies (4) required for this purpose depends in this embodiment essentially on the size of the wound space (5).

The covering material (1) is fastened in the area of the wound environment (6), which usually has intact skin. The size of the covering material should be such that the covering material outside the wound area in the area of the

Wound environment (6) can be attached. The cover material (1) may be in various dimensions and shapes, for example circular, oval or rectangular. It may also be present in an irregular shape adapted to the wound. The cover material (1) can be an opaque material, a partially transparent material, or a completely transparent material. The use of transparent material may be advantageous to control the

To allow healing of the wound. The use of only partial

transparent or opaque material may be advantageous to spare the patient the sight of the wound. Alternatively, the covering material (1) can also be a rigid material, which is applied in the form of a wound-open shell over the wound area and fastened in the region of the wound environment (6). The covering material (1) must be secured in the area of the wound environment (6) and airtight be sealed. This can be done, for example, by the covering material (1) having an adhesive edge. The adhesive edge should be as far as possible until the application of the

Association be protected by protective strips. Alternatively, an adhesive may be applied either to the edge of the cover material (1) and / or to the intact skin around the wound environment. This has the advantage that an adaptation of the covering material to the shape and size of the wound is easier. An attachment and airtight seal of the device can also be achieved by the use of adhesive tape or adhesive. The means for the functional connection of the wound space (5) with an outside of the

Covering material located vacuum source (10) comprises in the embodiment shown in Figure 1, a negative pressure fitting (7), which is also referred to as "port." The vacuum fitting (7) via a hose (8) with the

Vacuum unit (10) connected. Between the vacuum fitting (7) and the vacuum unit (10) is still a collecting vessel (9) for the extracted liquids. The vacuum connector (7) is located in this embodiment on the side facing away from the wound outside of the air-impermeable cover material (1). To the wound space (5) with an outside of the cover material

Understand vacuum unit (10) functionally, one or more through the cover material (1) passing through openings must be in this arrangement in the region of the vacuum connector (7). Furthermore, an airtight seal must be ensured. Suitable vacuum fittings, which usually include adhesive attachment means for attaching the port to the cover material, are commercially available, for example, the vacuum fitting "VivanoTec" port from Paul Hartmann AG, Germany.

Further embodiments of the device according to the invention for the negative pressure therapy of wounds are shown in FIGS. 2 and 3. In contrast to the device shown in Figure 1, the device according to Figures 2 and 3 each further comprises a pressure distribution layer (1 1), which is arranged between the absorbent body (4) and covering material (1). In accordance with the arrangement of the dressing components shown in FIG. 2, substantially the entire wound surface (2), including the exposed blood vessel (3), is likewise brought into contact and covered with the absorbent bodies (4). According to the variant of the device for negative pressure therapy of wounds shown in FIG. 3, in contrast to the embodiments shown in FIGS

Essentially, the exposed blood vessel (3) is brought into contact with the absorbent body (4) and been covered. In this case, the absorbent body (4) covers the exposed blood vessel (3) as completely as possible. On the absorbent body (4), the pressure distribution layer (1 1) is applied. The wound space (5) is thus substantially completely filled by the pressure distribution layer (11), which in this embodiment is arranged between the absorbent body (4) and the covering material (1). It stands the

Pressure distribution layer (1 1), in contrast to the embodiment shown in Figure 2 also in direct contact with that portion of the wound surface (2), which does not comprise a sensitive structure. The pressure distribution layer (1 1) is therefore not in direct contact with the blood vessel (3).

The devices shown in Figures 2 and 3 each comprise only one

Pressure distribution layer (1 1). It is also possible to use multiple pressure distribution layers, wherein different pressure distribution layers can be combined. The additional pressure distribution layer (11) may be configured to pass liquid such as wound exudate through it. This can be the

Pressure distribution layer containing suitable channels or opening. Alternatively, it may consist of a material which allows the passage of wound exudate without further

Precautions allows. A further preferred embodiment of the device according to the invention for

Vacuum therapy of wounds is shown in FIG. In this case, the device furthermore comprises a wound contact layer (12) which is applied to that portion of the wound surface (2) which does not comprise any sensitive structure. The

Pressure distribution layer (1 1) is applied accordingly to the wound contact layer (12) and on the absorbent body (4). The wound contact layer (12) should be such that wound exudate can pass the wound contact layer (12). It is also possible to use several wound contact layers. It can also different

Wound contact layers are combined with each other. The wound contact layer (12) may also comprise fibers or tamponade strips.

A further embodiment of the device according to the invention for negative pressure therapy of wounds shown in FIG. 5 differs from that shown in FIG

Embodiment in that the wound contact layer (12) on the entire

Wound surface is applied and thus the sensitive structure (exposed blood vessel, 3) covered. In this embodiment, make sure that the

Wound contact layer (12) does not stress the blood vessel (3) mechanically. example

Wound type: mechanical trauma with exposed blood vessel

First, the wound is freed from necrosis and contamination (debridement).

Then, that region of the wound surface in the exposed blood vessel with a suction body (TenderWet ^® active cavity, Paul Hartmann AG, Germany) completely covered. TenderWet active cavity is a Ringer's solution-saturated wound pad, which comprises an envelope of interlock knit made of polypropylene fibers and, arranged therein, an airlaid made of a superabsorbent polyacrylate, cellulose and polypropylene fibers. The remaining wound will be open-celled

Polyurethane foam (VivanoMed Foam, Paul Hartmann AG, Germany) as

Supplied pressure distribution layer. The foam is placed around the absorbent body as well as over the absorbent body and the wound space is completely filled. The thus treated wound is ^® with a polyurethane film (Hydrofilm, Paul Hartmann AG,

Germany) as cover material hermetically sealed. Then a hole in that

Cover material cut and a vacuum fitting (VivanoTec Port, Paul Hartmann AG, Germany) mounted over it, for an optimal dissipation of

To ensure wound exudates. The vacuum fitting is connected via a hose to a collection vessel and a vacuum unit (VivanoTec negative pressure therapy unit with secretion canister, Paul Hartmann AG, Germany). At the vacuum unit, a vacuum of 125 mmHg is set in continuous mode. The components used for the wound dressing (absorbent body, pressure distribution layer,

Cover foil, vacuum fitting) as well as the tube and the collecting vessel are used in a sterile condition.

After attaching the bandage and activating the vacuum unit builds up

Negative pressure in the wound room. The wound exudate can be sucked off and collected in the collecting vessel. If the receptacle is completely filled, it can be replaced with a new one without having to change the dressing.

After 2 days, the dressing is changed and the wound is assessed. After renewed debridement, a new wound dressing is applied as described above. This is repeated until sufficient granulation tissue has formed, so that the

Blood vessel is no longer exposed (medical assessment). Subsequently, the patient is prepared for a split skin transplant. This is a thin skin layer of a taken from the patient's intact body site. This is increased by an apparatus in their area by a multiple and as a split skin graft on the

Ulcer wound attached. Thereafter, the negative pressure therapy is continued, the

Absorbent body no longer is used and the wound space completely with the open-cell polyurethane foam (VivanoMed Foam), optionally in combination with a wound contact layer (for example Atrauman ^® or Atrauman Ag ^®, Paul Hartmann AG, Germany), filled out. Finally, the negative pressure therapy is stopped. The wound treatment with a hydrogel or hydrocolloid wound dressing (HydroTac ^® or Hydrocoll ^®, Paul Hartmann AG, Germany) continued until complete wound closure.

Claims

claims

1 . Absorbent body (4) comprising a superabsorbent polymer, for therapeutic

Treatment of a wound comprising on its surface (2) a sensitive tissue structure (3) lying deep in the intact body by means of negative pressure, wherein the tissue structure (3) is a blood vessel and / or a nerve.

2. Superabsorbent polymer, for the therapeutic treatment of a wound, which on its surface (2) a sensitive and deep-seated in the intact body

Tissue structure (3) comprises, by means of negative pressure, wherein the superabsorbent polymer in an absorbent body (4) is contained and wherein the tissue structure (3) is a blood vessel and / or a nerve.

3. Use of a superabsorbent polymer for the production of an absorbent body (4) for use in the therapeutic treatment of a wound, which on her

Surface (2) a sensitive and deep in the intact body

Tissue structure (3) comprises, by means of negative pressure, wherein the tissue structure (3) is a blood vessel and / or a nerve.

4. Absorbent body (4) comprising a superabsorbent polymer, for therapeutic

Treatment of a wound by means of negative pressure, wherein the absorbent body (4) during treatment with a sensitive and deep-seated in the intact body

Tissue structure (3) is brought into contact with the surface of the wound (2) to protect the tissue structure (3) from mechanical stress, and wherein the tissue structure (3) is a blood vessel and / or a nerve.

5. Superabsorbent polymer, for the therapeutic treatment of a wound by means of negative pressure, wherein the superabsorbent polymer is contained in a absorbent body (4) and wherein the absorbent body (4) during the treatment with a sensitive and deep in the intact body tissue structure (3) on the surface the wound (2) is brought into contact with the tissue structure (3) before mechanical

To protect stress, and wherein the tissue structure (3) is a blood vessel and / or a nerve.

6. Use of a superabsorbent polymer for producing a absorbent body (4) for use in the therapeutic treatment of a wound by means of negative pressure, wherein the absorbent body (4) during the treatment with a sensitive and im intact body deep tissue structure (3) at the surface of the wound (2) is brought into contact to protect the tissue structure (3) from mechanical stress, and wherein the tissue structure (3) to a blood vessel and / or around a Nerve is acting.

7. Absorbent body (4) or superabsorbent polymer or use according to one of the preceding claims, wherein the tissue structure (3) occupies an area of at least 1 cm ² .

8. Absorbent body (4) or superabsorbent polymer or use according to one of claims 4 to 6, wherein the absorbent body (4) for at least 6 hours with the

Tissue structure (3) is brought into contact.

Absorbent body (4) or superabsorbent polymer or use according to any one of the preceding claims, wherein the superabsorbent polymer is a superabsorbent polyacrylate.

10. Absorbent body (4) or superabsorbent polymer or use according to one of the preceding claims, wherein the absorbent body (4) further comprises a mixture of cellulose fibers and polypropylene fibers as a carrier material.

1 1. Absorbent body (4) or superabsorbent polymer or use according to one of the preceding claims, wherein the absorbent body (4) is an absorbent body (4) surrounded by a textile sheath.

12. absorbent body (4) or superabsorbent polymer or use according to one of the preceding claims, wherein the absorbent body (4) is acted upon with a solution.

13. Absorbent body (4) or superabsorbent polymer or use according to claim 12, wherein the absorbent body (4) with at least 500 weight percent, based on the weight of the dry absorbent body (4), the solution is applied.

14. Absorbent body (4) or superabsorbent polymer or use according to claim 12 or 13, wherein the solution is a synthetic, aqueous solution, in particular Ringer's solution.

Absorbent body (4) or superabsorbent polymer or use according to any one of the preceding claims, wherein the absorbent body (4) comprises an antimicrobial substance.

16. An absorbent body (4) or superabsorbent polymer or use according to any one of the preceding claims, wherein the negative pressure is generated by means of a device for negative pressure therapy of wounds, wherein the device in addition to the absorbent body, an air-impermeable cover material (1) for airtight sealing of the wound and Wound environment (6), and

a means (7) for the functional connection of the wound space (5) with a vacuum source (10) located outside the covering material (1), so that the negative pressure in the wound space (5) can be produced and liquids can be sucked out of the wound space (5) , and wherein the absorbent body in the space between the surface of the wound (2) and the cover material (1) can be introduced.

17. Device for negative pressure therapy of wounds comprising

a) an air-impermeable covering material (1) for airtight sealing of the wound and the wound environment (6),

b) a means (7) for the functional connection of the wound space (5) with a

outside of the cover material (1) located vacuum source (10), so that a negative pressure in the wound space (5) can be produced and liquids from the wound space (5) are sucked,

c) at least one absorbent body (4) or a superabsorbent polymer according to any one of claims 1, 2, 4, 5 or 7 to 15, which / s in the space between the surface of the wound (2) and the cover material (1) can be introduced ,

18. Absorbent body (4) or superabsorbent polymer or use or apparatus for negative pressure therapy of wounds according to claim 16 or 17, wherein the apparatus further comprises at least one pressure distribution layer (1 1), which between the

Absorbent body (4) and the cover material (1) can be introduced comprises.

19. Absorbent body (4) or superabsorbent polymer or use or device for negative pressure therapy of wounds according to claim 18, wherein the Pressure distribution layer (1 1) to open-cell or semi-open-cell foam, a spacer knitted fabric, a textile layer, a structured gel or a non-woven permeable layer.

20. Absorbent body (4) or superabsorbent polymer or use or device for negative pressure therapy of wounds according to claim 19, wherein the open-cell or semi-open-cell foam is polyvinyl alcohol foam, silicone foam or polyurethane foam.

21. Absorbent body (4) or superabsorbent polymer or use or apparatus for negative pressure therapy of wounds according to any one of claims 16 to 20, wherein the apparatus further comprises at least one wound contact layer (12) disposed between the surface of the wound (2) and the pressure distribution layer (11) and / or between the surface of the wound (2) and the absorbent body (4) can be introduced comprises.

22. Absorbent body (4) or superabsorbent polymer or use or apparatus for negative pressure therapy of wounds according to claim 21, wherein it is in the

Wound-contact layer (12) is a polyurethane layer, a hydrocolloid layer, a structured gel, a polyorganosiloxane layer, a permeable nonwoven layer or a grille.