DE9012161U1 - Foil-based dressing material - Google Patents

Description

Beiersdorf AG Hamburg

Foil-based dressing material

Description

The invention relates to a film-based dressing material which is covered on one side with a carrier material and provided with a self-adhesive layer on the other side.

Supple, relatively thin adhesive materials made of films in strip or sheet form are suitable for a wide variety of medical care applications, e.g. as incision film for sterile covering of the surgical site, for covering large areas of bandages or for securing cannulas, catheters and the like. Due to their flexibility, they conform to uneven surfaces and their generally well-developed air and water vapor permeability enables the skin to breathe.

However, handling the thin, flaky material is always a problem, which is usually not possible without special handles. A wide variety of suggestions have been made for the design of these handle strips or edges, and some have even been implemented (see, for example, EP-A 66 899, EP-B 81 987, EP-B 81 989, EP-A 117 632, EP-A 161 865, DE-A 33 17 929). However, they always require tearing or cutting off the edge, or have a

complicated laminate structure that can only be produced at high cost.

In order to improve the handling of such films, which are preferably made of polyurethane, it has already been proposed to arrange them on a carrier material that can be subsequently removed (see, for example, EP-B 51 935, EP-B 81 990, EP-B 144 891) and which in some cases offers the possibility of being touched.

However, these known embodiments also have the disadvantage that they are complicated and require explanation in their use, as well as expensive and laborious in their production.

The aim of the invention was therefore to develop an application system for thin and flexible film-based adhesive materials that is easy to handle and uncomplicated and thus inexpensive to manufacture.

This problem is solved in a surprisingly simple but effective way by a film-based dressing material that is covered on one side with a carrier material and on the other side with a self-adhesive layer, which is characterized in that the carrier consists of a flexible and supple material that is the same size as the film and has protruding handle strips attached along its right and left edges.

The carrier material, which has a supporting effect on the film and remains on it when the dressing is applied, preferably consists of a polyethylene film of about 80 microns thickness, which is

its side facing the foil is slightly roughened and therefore appears matt but still translucent.

Other films made of polypropylene, polyester, PVC or suitable thin, coated paper can also be used, provided they are flexible enough not to interfere with the application of the bandage.

Your technical data can be in the following ranges:

Thickness: 30 - 300 microns

Weight: 30 - 350 g/m ²

Maximum tensile strength longitudinal: 5 - 100 N/cm Elongation at break longitudinal: 10 - 1000%

The surface of the film can be smooth, roughened or slightly embossed.

The grip strips, which are attached to the right and left outside edges of the carrier material, about 3 cm wide when viewed in the lengthwise direction of the bandage and protrude about 2 cm from this, are preferably made of an LDPE film (low density polyethylene film) that is also 80 micrometers thick. To be clearly visible, they are colored blue, for example, and embossed matt on the outside for better grip.

Instead of this film, other materials such as HDPE, polypropylene, PVC, PU or polyester films as well as fleece, paper or fabric can be used, provided they are sufficiently flexible and supple.

Depending on the material, the thickness can vary between 10 and 300 micrometers, the weight accordingly between 10

2
to 350 g/m. The surface can be matt, glossy, rough, smooth or printed. The

Depending on the material, the maximum longitudinal tensile force can vary between approximately 3 and 100 N/cm and the resulting elongation can vary between 5 and 500%.

Depending on the material and processing machines, the handle strips can be attached to the carrier material in a variety of ways, preferably by gluing or welding. Gluing is done, for example, by inserting a strip of double-sided adhesive tape between the carrier material and the handle strip in the overlap area, or by applying an adhesive coating made from a hot melt compound or a self-adhesive compound made from a solvent or dispersion.

The dressing film itself is preferably made of elastic, thermoplastic polyurethanes, as described in DE-C 19 34 710, which are characterized by good skin compatibility and oxygen and water vapor permeability. Aliphatic polyester urethanes have proven to be particularly advantageous.

A preferred film is about 30 - 40 micrometers thick, transparent, has an elongation at break of over 450% and a water vapor permeability of over g/m ² in 24 hours at 38 ⁰ C and 95% relative humidity according to DAB.

However, films based on other materials, such as acrylate copolymers or other known film-forming elastic polymers, can also be used. The thickness of the films can vary between about 30 - 300 micrometers, the weight accordingly between about 30 - 350 g/m, the maximum longitudinal tensile strength between about 5 - 100 N/cm and the longitudinal elongation at break between about 10 - 1000%.

The adhesion of the film to the carrier material, which only needs to be low (approx. 0.01 - 0.5 N/cm, preferably 0.01 - 0.05 N/cm), is preferably achieved by producing the thin film directly on the carrier by casting, doctoring, extruding or other known methods of film production. If necessary, the carrier material can be roughened on the coating side or subjected to another adhesion-promoting treatment. An adhesion-promoting coating can also be advantageous.

It is important that the adhesion of the finished dressing to the skin is significantly stronger than the adhesion of the carrier to the film.

The adhesive layer on the film, for example, preferably has an adhesive strength on steel of around 2-4 N/cm, whereby the test material, since the film is very stretchy, must be reinforced on the back with an inelastic adhesive film for the measurement. The measurement itself was carried out in accordance with DAB 9.

On its self-adhesive side, which later faces the skin, the dressing material according to the invention is usually covered over its entire width with an adhesive-repellent carrier material, such as siliconized paper, until use. This protects the self-adhesive layer made of a skin-compatible adhesive mass, for example based on acrylic, which has preferably been applied using a transfer process, and additionally stabilizes the entire product. The cover can be made in a known manner in one piece or preferably in two parts. It is preferably somewhat wider than the carrier material and the film in order to protect their edges.

The dressing material can be used as such, but a standard absorbent wound pad of a suitable width can also be applied in the middle so that it can be used directly as a wound dressing. A dressing of this type with all-round adhesive is particularly advantageous because it is germ-proof and waterproof.

The dressing material according to the invention is offered in the form of individual prefabricated sections and possibly sterilized by gamma rays and sealed in various lengths and widths. When used, the protective cover over the adhesive layer is simply removed, the material is grasped on both sides by the handles and stuck on as required. The easily removable carrier material on the back of the film with the handles is then peeled off without leaving any residue.

There is no need for instructions to use the bandage, as this is self-explanatory. As the entire bandage, including the supporting backing film, is transparent, it can be applied precisely without difficulty.

In Figure 1, the dressing material according to the invention is shown with increased thicknesses of the layers, for example. Here, 1 means the film, 2 the carrier, 3 the handles, 4 an adhesive layer for attaching the handles to the carrier, 5 the self-adhesive layer and 6 the protective cover for the self-adhesive layer.

Claims (8)

Protection claims 1. A film-based dressing material which is covered on one side with a carrier material and on the other side with a self-adhesive layer, characterized in that the carrier consists of a flexible and pliable material which is the same size as the film and has protruding grip strips attached along its right and left edges. 2. Dressing material according to claim 1, characterized in that the carrier material consists of a matt, transparent polyethylene film. 3. Dressing material according to claim 1, characterized in that the handle strips consist of an LDPE film. 4. Dressing material according to claim 1, characterized in that the handle strips are glued or welded to the supporting material. 5. Dressing material according to claim 1, characterized in that the film consists of polyurethane. 6. Dressing material according to claim 1, characterized in that the film has been produced on the carrier material and adheres to it. 7. Dressing material according to claim 1, characterized in that a wound dressing is arranged on the adhesive side, which is smaller than the adhesive surface, so that adhesive edges remain free. 8. Dressing material according to claim 1, characterized characterized in that the self-adhesive layer is provided with a removable protective cover which is slightly wider than the carrier material and the film.