WO2004091676A1

WO2004091676A1 - Bandaging material

Info

Publication number: WO2004091676A1
Application number: PCT/DE2004/000547
Authority: WO
Inventors: Thomas Riesinger
Original assignee: Thomas Riesinger
Priority date: 2003-04-10
Filing date: 2004-03-17
Publication date: 2004-10-28
Also published as: DE112004001060D2

Abstract

The invention relates to bandaging material made of a sequence of several layers which are adjacent to each other and which are connected together and at least one layer is made from a fibrous material. A chamber is provided in order to distribute a liquid treatment medium and is arranged inside the layer sequence. The fibrous material of at least one layer is at least partially electroconductive and is embodied as an electric measuring electrode and/or measuring resistor.

Description

dressing material

The invention relates to a dressing material according to the preamble of claim 1.

It is known in principle that the healing of wounds in a moist environment can be improved, in particular media which support wound healing or contain at least one medicament, for example solutions, can also be used. A commonly practiced method is that the dressing material or a layer consisting of an absorbent material is soaked with the relevant solution and then the dressing material is applied to the wound. The handling is cumbersome and especially when treating larger and deeper wounds and when the bandage changes frequently, a specially trained staff is necessary. In order to remedy this disadvantage, a dressing material has already been proposed (DE 101 39 399.7 A1), which consists of a layer sequence of different materials and is formed within this layer sequence with a chamber for dispensing a liquid treatment medium.

The object of the invention is to improve such a dressing material in such a way that the condition of the dressing material can be monitored while maintaining the required properties of the layers of the layer sequence, in particular also with regard to the permeability to gas and / or air and / or moisture.

A dressing material according to claim 1 is designed to solve this problem. In the dressing material according to the invention For example, the resistance value of the at least one metallized layer or a measuring resistor formed there is measured. This resistance value is determined on the one hand by the type and / or thickness of the coating, but on the other hand also depends on the degree of moisture in this layer and on the type of liquid medium contained in the layer.

Basically, however, there is also the possibility that the metallized layer forms an electrode, which is assigned a further electrode which, for. B. is also formed by a metallized layer and is separated from the first electrode by at least one non-metallized layer of the layer sequence of the dressing material, so that then by measuring the resistance and / or by measuring the capacitance between the electrodes, the degree of moisture inside the dressing material and / or the type of liquid medium absorbed by the dressing material can be determined.

Electrically conductive layer in the sense of the invention initially means very generally a layer of the layer sequence of the dressing material which (layer) is electrically conductive, for example by appropriate choice of material and / or by a corresponding coating. The layer is preferably one which is permeable to the treatment medium and / or to gas or air. The layer is z. B. one made of fibers, e.g. B. in the form of a fabric or a non-woven material.

A “metallized layer” in the sense of the invention is a layer that is applied by applying a thin metallization, for example by galvanic deposition and / or vapor deposition or in another way electrically conductive and preferably at the same time permeable to the treatment liquid and / or to gas and / or air If the layer consists of fibers (e.g. fabric or non-woven material), the individual fibers are, for example, provided with the thin metal layer. In principle, there is also the possibility of metallizing the layer-forming flat material after it has been produced.

Developments of the invention are the subject of the dependent claims. The invention is explained in more detail below with reference to the figures using exemplary embodiments. Show it:

Fig. 1 in a schematic partial representation of the layer structure of a dressing material according to the invention, the individual layers actually bonded together in the dressing material for better clarity

Type of an exploded view are shown separated from each other; Fig. 2 in a simplified schematic representation a top view of the material of the

Figure 1; 3 shows a schematic partial representation of the layer structure of a further dressing material according to the invention;

4 shows schematically a resistance structure serving as a sensor element.

The dressing material, generally designated 1 in the figures, which is also particularly suitable for treating open, deep wounds, is essentially designed as a multi-layer flat material, for example with a square or rectangular cut.

In the embodiment shown, the dressing material 1 consists of a first, sterile layer 2 lying on the outside, which forms the support on the wound and is formed by a perforated flat material, for example perforated film or grid made of a suitable plastic, for example PVC. The single-layer outer layer 2 is followed by a layer 3, which consists of several layers of a sterile, absorbent and air and moisture-permeable material, for example a coarse one Fabric or a nonwoven material is formed. In the embodiment shown, layer 3 consists of several layers of sterile gauze, for example four layers. The other surface side or outside of the dressing material 1, which in use is the outer surface of this dressing material facing away from the wound, is formed by a layer 4, which in the embodiment shown is of a single layer, consisting of a flat material or a film, preferably one plastic film. The layer 4 has semipermeable properties, ie it is permeable to air and gases, but not permeable to liquids. On the inner side of the layer 4 facing the layer 3, a lumen or tube piece 5 is fastened, which extends in a meandering manner almost over the entire surface of the layer 4 and thus over the entire surface of the dressing material 1 and forms two ends or connections 6, which are led out laterally from the dressing material 1, in the embodiment shown in such a way that these ends 6 protrude on two opposite circumferential sides 1 'and 1 "of the dressing material.

The tube piece 5, which forms a channel for receiving and distributing a treatment medium, in particular a liquid or aqueous treatment medium, is on its inside the dressing material 1, i.e. between the layers 3 and 4 extending length so that a finely divided outlet of the treatment medium present in the tube piece 5 is possible in the layer 3. For this purpose, the tube piece 5 is, for example, finely perforated. The projecting ends 6 are preferably each formed by a tube length that does not have this perforation.

The individual layers 2, 3 and 4 with the tube piece 5 arranged between the layers 3 and 4 are connected to one another in a suitable manner, for example, along the edge of the dressing material 1 and / or point-like also within the dressing material 1.

In use, the dressing material 1 is placed on the wound to be treated with the layer 2 and then fixed, for example, at the edge by means of an adhesive tape 7 or in some other way. In order to achieve improved wound healing in a moist environment, a solution suitable for wound treatment is supplied via an end 6, for example via the upper end in FIG. 2, and until such solution emerges at the other end or connection 6 and thus the entire chamber formed by the hose section 5 is filled with this treatment solution. Then both ends 6 are closed, for example with a suitable plug. The treatment solution emerging from the tube piece 5 is finely distributed over the entire dressing material over the layer 3 and thus in particular also over the entire wound area. The solution in the hose section 5 is renewed and replaced several times a day, for example twice a day.

The wound material is optimally kept occlusive and moist by the dressing material according to the invention, so that a significantly improved wound healing is achieved. The particular advantage of the dressing material according to the invention, however, is that a change of the dressing is only necessary after several days, for example only every three days, so that the first change of the dressing material usually takes place at a time when even a deep, open wound has already closed to such an extent that the risk of an additional infection when changing the dressing can be excluded. The large time interval between the application of the dressing material and the first change of this dressing material also ensures, in particular, that the wound is necessary for the first healing process within the first days after the care of a wound. The dressing material according to the invention thus combines the advantages of wound healing in a moist environment with the advantage of long wound rest, which promotes the healing process, particularly in the first few days.

FIG. 3 shows a further exemplary embodiment of the invention in a schematic representation and in section of a dressing material 1 a, which in turn has a multi-layer design and also serves to improve wound healing in a moist environment. The dressing material 1 a consists of a lower layer 10, with which this material is placed on a wound. This layer 10, which forms the sterile dressing on the wound, is made of a sterile perforated flat material, for example a perforated or lattice-like film made of a suitable plastic, e.g. made of PVC or silicone.

A layer 11 is provided on the layer 10, which serves as a distribution layer for the treatment liquid and for this purpose is made, for example, from a sterile, soft and absorbent material, for example from gauze or from a nonwoven material (fleece). On the side of layer 11 facing away from layer 10 there is a layer 12 which contains the liquid treatment medium in encapsulated form, in such a way that the treatment medium is opened via layer 11 by opening or breaking layer 12 or the capsules there distributed to the

Underside of the dressing material and thus is delivered to the wound area. A covering layer 13 is provided over the layer 12, which consists of a semi-permeable flat material, i.e. from a flat material which is not or largely impermeable to the liquid treatment medium, but permeable to air and gases.

As is also shown in FIG. 3, the cover layer 13 covers the dressing material 1 a or the various layers and layers thereof Dressing material also from the side and is provided with a skin-compatible adhesive application 14 on the edge which is at the level of the underside of the layer 10. The dressing material 1 a is sterile closed with a removable cover layer 15 on the side with which it is applied to a wound. Layer 15 is subtracted in use.

In use, the dressing material, after removal of the cover or protective layer 15 with the then exposed layer 10, is placed on the wound and fixed with the adhesive layer 14 around the wound. By breaking the layer 12, the encapsulated treatment liquid is released.

The dressing material 1 a is preferably designed such that when the dressing is changed, the layer 10 of the existing dressing is separated from the adjacent layer 11 and the layer 10 thus remains on the wound, so that the rest of the wound and thus the healing process are not impaired by a dressing change , The fresh dressing material used when changing the dressing then corresponds to the dressing material 1a, but without the layer 10, i.e. the design is then such that, in addition to the protective layer 15, the layer 10 can also be removed from the dressing material 1a if necessary.

As a treatment medium, for example, a solution is used which contains zinc and iron in aqueous solution, in addition to distilled water and sulfuric acid per liter of solution 10 - 100 mg Zn and 6.5 - 65 mg Fe, e.g. 15 - 45 mg Zn and 10 - 30 mg Fe, the proportion of sulfuric acid being chosen so that a pH value between 2.5 to 3.5, preferably 2.8. In a preferred embodiment, a 95-97% sulfuric acid is used. The distilled water is a double distilled water according to DAB 10. Suitable raw materials are for example ZnCI ₂ and FeS0 ₄ , namely about 20 - 209 mg ZnCI ₂ and 32 - 325 mg FeS0 ₄ per liter of solution.

In the case of both of the aforementioned dressing materials 1 and 1a, one layer each and preferably the layer 3 and 11 serving to distribute the liquid negotiation medium are made from a single or multi-layer fabric made of metal-coated fibers, so that these fibers are electrically conductive. Provided electrically connected to the fibers is a semiconductor circuit, generally designated 16 in the figures, which is designed, for example, as a highly integrated circuit. This circuit 16 is sealed or sealed from the treatment solution in the dressing material 1 or 1a. A measurement value is formed in the semiconductor circuit 16, for example by resistance measurement, over the electrically conductive fibers of the metal-coated fabric, which measurement is a measure of the degree of moisture within the dressing material 1 or 1a, so that the presence or absence of a circuit 16 sufficient amount of the action fluid can be monitored. The semiconductor circuit 16 is designed, for example, so that it transmits the measurement data wirelessly, i. H. transmitted by radio to a measuring or monitoring or control device, not shown. The supply battery necessary for the operation of the semiconductor circuit 16 is also sealed in the dressing material 1, 1a.

In principle, there is the possibility of also designing the semiconductor circuit in the manner of a transponder, so that it then generates its own voltage required for operation without its own supply voltage source on the basis of a received high-frequency power. It has been assumed above that the presence or absence of the liquid negotiation medium is monitored using the semiconductor circuit 16 and using the fibers which are vapor-coated or coated with metal and serve as measuring electronics. Basically, there is also the possibility to monitor other values, for example a possible shutdown of

Wound secretions in case of inflammation to indicate the need to change the dressing, etc.

In order to obtain unambiguous information in the case of different, monitored states, for example, typical comparison values for the respective state can be stored or stored in the semiconductor shaft of the circuit 16, with which the actual measured values are then compared, the actual measured value corresponding to a specific state assigned typical measured value, a signal corresponding to this state is emitted.

Furthermore, there is also the possibility of attaching connection electrodes to the dressing material, which are connected to the metal-coated fibers or to the metal-coated fabric and via which the dressing material can be connected to an external device.

Preferably, at least two fabric layers made of the metal-coated fibers and at least one non-conductive layer, for example fabric layer, are provided between these fabric layers, which is, however, permeable to liquid, so that a sensor area is formed over the two conductive fabric layers and the non-conductive fabric layer between them, for example for capacitive measurement or a resistance measurement. FIG. 4 shows a measuring resistor 18, which is produced in a spiral manner with a plurality of turns 18.1 through metallized fibers, which run in several layers of the dressing material and are connected from layer to layer by suitable measures to form the spiral measuring resistor 18.

In the dry state, the measuring resistor 18 has a predetermined resistance value, which changes depending on the moisture, depending on the presence or absence of the liquid treatment medium.

LIST OF REFERENCE NUMBERS

1, 1a dressing material 1 ', 1 "peripheral edge

2 layers of a sterile, perforated flat material made of plastic, for example made of PVC as a covering on the wound

3 Protective layer made of a sterile, soft and absorbent material, for example gauze

4 layer of a semi-permeable material

5 piece of hose

6 hose end or connection

7 adhesive tape 10, 11 layer

12 location

13 cover layer

14 Application of adhesive

15 cover layer 16 electrical circuit

17 Power supply

18 Resistance structure 18.1 turns

Claims

claims

1. dressing material, consisting of a layer sequence of several adjoining and interconnected layers, at least one of which consists of a fiber material, and with at least one chamber provided within the layer sequence for dispensing a liquid treatment medium to the layer sequence, characterized in that the fiber material the at least one layer is at least partially electrically conductive as an electrical measuring electrode and / or measuring resistor.

2. Dressing material according to claim 1, characterized in that the fibers of the at least one layer are provided with a metallization.

3. Dressing material according to claim 1 or 2, characterized in that the at least one layer is a tissue.

4. Dressing material according to one of the preceding claims, characterized in that the layer sequence has at least two layers, each forming at least one measuring electrode or at least one measuring resistor.

5. Dressing material according to one of the preceding claims, characterized in that the at least one, at least one measuring electrode or at least one measuring resistor forming layer is part of the layer sequence, which serves to distribute the liquid treatment medium.

6. Dressing material according to one of the preceding claims, characterized in that the at least one, at least one electrode or at least a measuring resistance-forming layer which is used to rest on a wound surface of the dressing material or a layer adjacent to this wound dressing surface.

7. dressing material, according to one of the preceding claims, characterized in that the layer sequence consists of at least one perforated layer forming the wound dressing, of several soft and at the same time absorbent second layers and at least one in use, the top of the dressing material facing away from the wound third layer and that at least one of the second layers is the layer which forms the at least one measuring electrode or at least one measuring resistor.

8. Dressing material according to one of the preceding claims, characterized in that the at least one chamber at least one on an outside of the dressing material accessible connection (6) for feeding the

Has treatment medium and is formed on a wall for the finely distributed delivery of this treatment medium in the layer sequence or the at least one second layer (3).

9. dressing material according to one of the preceding claims, characterized in that the at least one chamber (5) is finely perforated.

10Nerbandmaterial according to any one of the preceding claims, characterized by electrodes for connection to an external measuring or evaluation device.

11. Dressing material according to one of the preceding claims, characterized by measuring and evaluation electronics (16) accommodated in the dressing material.