KR20050030650A - Adhesive tape of medical treatment - Google Patents

Abstract

Provided is an adhesive tape for medical treatment which contains an adhesive-uncoated surface(15), thereby showing a high gas permeability and has waterproofness and a sufficient adhesive strength due to the continuously connected coated surface(25) of net shape. The adhesive tape comprises a base sheet(10) coated with an adhesive(20) in a net shape. Preferably the net shape is line, curve, circle or their combination. Preferably the adhesive is coated on the edge part of the base sheet; and the adhesive coated surface(25) of net shape occupies 10-90 % of the total area of the adhesive tape. Preferably the base sheet is a polyurethane film, and the adhesive is an acryl-based adhesive.

Description

Adhesive tape of medical treatment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical adhesive tape for fixing medical devices, dressing materials, etc. to the skin. More particularly, the present invention relates to a high-permeability and water-resistant coating by coating a pressure-sensitive adhesive on a base sheet. It relates to a medical adhesive tape having at the same time.

In the medical field, medical adhesive tapes (or fixing tapes), such as surgical tapes and band-aids (emergency band-aids), are used for the purpose of fixing medical devices, roll bandages, wound protection dressings, transdermal absorbents and the like to the skin.

In general, a medical adhesive tape (fixing tape) is configured by coating an adhesive on a base sheet. Such a medical adhesive tape should have a proper adhesive force to firmly fix the medical equipment, dressings, etc. to the skin and to be easy to remove, and above all directly attached to the skin should have a high moisture permeability to avoid damage to normal skin. In addition, high moisture permeability can promote wound healing.

As described above, the medical adhesive tape is formed by coating an adhesive on a base sheet. In this case, in general, the adhesive is coated on the entire surface of the base sheet. The conventional medical adhesive tape has a disadvantage of low moisture permeability due to the influence of the adhesive itself regardless of the moisture permeability of the base sheet. That is, even when using a base sheet having a high moisture permeability (gas permeability) there is a problem that the pressure-sensitive adhesive coated on the entire surface hinders the gas permeation and eventually the water vapor permeability of the adhesive tape falls.

When the medical adhesive tape with low moisture permeability is attached to the skin for a long time, the stratum corneum of the skin is hydrated and smoked by the moisture discharged from the skin.

This maceration gradually weakens the stratum corneum, causing the stratum corneum to fall off when the adhesive tape is removed, or injuring the skin torn when severe, and causing allergies or infections by invading bacteria from the damaged stratum corneum. To cause a second skin wound, such as. In addition, a wound healing dressing material may be covered on the wound surface and an adhesive tape may be attached on the wound surface, whereby the wound healing effect is reduced when the adhesive tape having a low moisture permeability is used.

In addition, conventionally, a technique of point coating has been attempted to have a portion where the pressure-sensitive adhesive is not coated in order to improve moisture permeability. This will be described with reference to FIG. 1.

As shown in FIG. 1, in coating the pressure-sensitive adhesive 2 on the base sheet 1, the pressure-sensitive adhesive 2 was point coated to have an uncoated surface 1a which is not coated to have a circular coating surface 2a. . However, this may have an improved moisture permeability through gas permeation through the uncoated surface 1a, but there is a problem that water invades the wound or medical equipment.

The user of the medical adhesive tape may be in contact with water. At this time, the waterproofness which can prevent water from invading a wound or a medical tool is calculated | required. However, the conventional technique shown in FIG. 1 has a problem in that water penetrates into the side surface (up and down left and right sides in FIG. 1) and thus is not waterproof. Specifically, point-coated circular coating surfaces 2a are formed discontinuously, that is, the coating surfaces 2a are not connected to each other so that water enters between the coating surfaces 2a. This invasion of water results in skin maceration as described above and at the same time is particularly fatal to wounds. In addition, the prior art as shown in Figure 1 is not coated with the adhesive (2) on the edge of the base sheet 1, that is, the edge of the base sheet 1, so that the lifting phenomenon occurs in this portion, often falling during use There was a problem.

Therefore, there is a need for a medical adhesive tape having both high moisture permeability and waterproofness to prevent maceration and invasion of water, and to promote wound healing, with appropriate adhesion.

The present invention is invented to solve the problems of the prior art as described above, by coating a pressure-sensitive adhesive to have an uncoated portion on the base sheet, but in a net (net) coating medical adhesive having a high moisture permeability and water resistance at the same time The purpose is to provide a tape.

In order to achieve the above object, the present invention provides a medical adhesive tape, characterized in that the adhesive is coated in a net (net) in the medical adhesive tape coated with a pressure-sensitive adhesive on the base sheet.

Specifically, the medical adhesive tape according to the present invention is coated with an adhesive so as to have a coating surface (part coated with an adhesive) and an uncoated surface (part not coated with an adhesive) on the base sheet, but the coating surface is uncoated. It is a continuous net shape to isolate the surface.

Therefore, the present invention by coating the pressure-sensitive adhesive in a net shape that can have a coating surface continuously connected to the uncoated surface, the gas permeate through the uncoated surface to have a high moisture permeability and at the same time continuously of the net type The coating surface is characterized in that it has a sufficient adhesive force and waterproof to completely prevent the intrusion of water.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 and 3, the medical adhesive tape of the present invention includes a base sheet 10 and a pressure-sensitive adhesive 20 coated on at least one side of the base sheet 10. At this time, according to the present invention, the pressure-sensitive adhesive 20 is coated in a net form to have an uncoated surface 15 and a coating surface 25. More specifically, the coating surface 25 has a net shape continuously connected to isolate the uncoated surface 15.

The base sheet 10 is gas permeable. The base sheet 10 includes a woven fabric, a nonwoven fabric, and a resin film. In addition, the base sheet 10 includes a single layer or a multilayer structure of two or more layers selected from a woven fabric, a nonwoven fabric, and a resin film. Preferably, it is a resin film which has liquid impermeability (water resistance) together with gas permeability (permeability).

The resin film used as the base sheet 10 is a resin that can have high moisture permeability, and specifically, polyurethane, polyethylene, silicone resin, natural and synthetic rubber, polyglycolic acid, polylactic acid or a copolymer thereof, poly Synthetic polymers, such as vinyl alcohol and polyvinyl pyrrolidone, collagen, gelatin, hyaluronic acid, sodium alginate, chitin, chitosan, fibrin, cellulose, etc. Natural polymers derived from these, or synthetic polymers derived from these, are used to produce a film. More preferably, it is a polyurethane film. Polyurethane films are preferred because they are excellent in physical properties such as tensile strength and elongation as well as gas permeability (moisture permeability) and liquid impermeability (water resistance). The polyurethane film includes one produced by extrusion, solvent volatilization or coagulation.

The pressure-sensitive adhesive 20 may be an acrylic, rubber, urethane or silicone pressure sensitive adhesive. Most preferably, an acrylic adhesive is used. Acrylic pressure sensitive adhesives are most preferred because of their low skin allergenicity.

The pressure-sensitive adhesive 20 is coated in a net form on the base sheet 10 to have a pressure-sensitive adhesive coating surface (part coated with an adhesive) and an adhesive non-coated surface (part not coated with an adhesive) according to the present invention as described above. In the present invention, the net form includes a shape consisting of a straight line, a curve, a circle, or a combination thereof. Specifically, as shown in FIG. 2, the coating surface 25 may have a net shape extending in a straight line, or may have a net shape extending in a curve as shown in FIG. 4. Or having a coating surface 25 of various shapes, such as circles or polygons, they may be a net shape connected by a straight line or a curve. Accordingly, the uncoated surface 15 may have various shapes, such as a rectangle and a circle, corresponding to the shape of the coating surface 25. 5 illustrates a state in which the uncoated surface 15 is coated to have a circular shape.

In this case, preferably, as shown in FIGS. 2 and 5, the adhesive 20 is coated on the edge of the base sheet 10 (that is, the edge of the base sheet 10) so that the lifting phenomenon does not occur in this portion. Do not

Therefore, the medical adhesive tape according to the present invention as described above has a high moisture vapor transmission through the gas through the uncoated surface (15). And the net-like coating surface 25 which continued continuously has waterproofness and adhesiveness improves.

That is, the present invention has a high moisture permeability through the gas permeated through this portion as compared to the conventional technology in which the adhesive 20 is coated on the entire surface, and has a high moisture permeability. Compared to FIG. 1, the present invention provides complete penetration of water into the side surface (up and down, left and right sides in FIG. 2) by the coating surface 25 enclosed in an outer shell as the coating surface 25 is continuously coated in a net shape. It is blocked and has waterproofness and at the same time, the adhesive 20 is coated in a wide distribution and has excellent adhesion. When the adhesive 20 is coated on the edge of the base sheet 10 as illustrated in FIGS. 2 and 5, the lifting phenomenon in this portion is prevented, and thus falling during use as in the prior art (FIG. 1). It is not generated and has even better adhesion.

In addition, the pressure-sensitive adhesive coating surface 25 is not particularly limited, but is preferably coated to have a range of 10 to 90% of the total area of the adhesive tape (or the total area of the base sheet). When the area ratio of the coating surface 25 is less than 10%, it may be difficult to have sufficient adhesive force, and when it exceeds 90%, it may be difficult to obtain the high moisture permeability desired in the present invention.

In addition, the interval (d) between the pressure-sensitive adhesive coating surface 25 is adjusted to various sizes to have a sufficient adhesive force according to the size (size) of the adhesive tape (product) and the purpose of use.

Medical adhesive tape of the present invention as described above is a fixing tape used for the purpose of fixing the medical equipment, roll bandages, wound protection dressings, transdermal absorbents, etc. to the skin, including surgical tape and band-aid (emergency bandage) and the like. do. At this time, the back sheet will be further included if it is supplied to the user (commercially available) with the wound protective dressing material attached to the center region (the surface coated with the adhesive) of the adhesive tape. Here, the back sheet is a release paper such as a vinyl film that can be removed when the adhesive tape is used.

Hereinafter, specific test examples and comparative examples of the present invention will be described. However, the following examples and comparative examples are provided only to explain the present invention in detail, and the technical scope of the present invention is not limited thereto.

EXAMPLE

Polyurethane elastomer was added to a mixed solvent of dimethylformamide (DMF) and methyl ethyl ketone (MEK) (DMF: MEK = 40: 60) and melted by heating and stirring at 60 ° C to give a colorless transparent viscous liquid. The urethane solution was obtained. In addition, a molding mold was prepared, which was taped to the edge of the release paper to form a wall at a constant height and waterproofed with silicone. Then, the polyurethane solution was poured on a release paper (molding mold), coated with a uniform thickness using a film coater (Test SANGYO Co. Ltd., PI-1210), and dried in an oven at 100 ° C. for about 1 hour. The thickness of the polyurethane film obtained after drying was measured at 20 μm.

After coating the acrylic pressure-sensitive adhesive (jaesung Co., Ltd., HT-900A acrylic copolymer-type adhesive) on the polyurethane film using a screen printing machine (Dasan Tech, product name DS-68M) for 5 minutes in an oven at 100 ℃ It dried and obtained the adhesive tape which has the net-type adhesive coating surface 25 extended in a straight line like FIG. At this time, several adhesive tapes with different adhesive coating areas were obtained. That is, as shown in the following [Table 1], the adhesive coating area is 10% (Example 1), 30% (Example 2), 50% (Example 3), 70% (Example 4) of the total area of the adhesive tape. ), An adhesive tape of 90% (Example 5) was obtained. At this time, the pressure-sensitive adhesive coating area was measured using an image analyzer (Inwoo Hitech, RZR 2051).

The moisture permeability and thickness of the adhesive tapes according to the present examples (1 to 5) as described above were measured, and the results are shown in the following [Table 1]. And the measuring method is as follows.

◈ Moisture permeability measurement

The moisture permeability evaluation factor was measured using a constant temperature and humidity chamber according to the test method of ASTM E96-90 (Inverted cup method). At this time, the temperature was 35 ± 0.5 ℃ and the relative humidity was 50 ± 5%, the moisture permeability was calculated according to the following equation.

                          P = A / S

A = ((a ₁ -a ₀ ) + (a ₂ -a ₁ ) + (a ₃ -a ₂ )) / 3

                          Where P: water vapor permeability (g / ㎡ / 24hr)

                              A: average amount of increase per hour (g)

S: moisture permeation area of the test piece (m ² )

a ₀ : Weight measured after 1 hour

a ₁ , a ₂ , a ₃ : Weight measured after 2 hours, 3 hours and 4 hours

◈ Thickness Measurement

The thickness of the adhesive tape and the polyurethane film used the dial thickness meter.

Comparative Example 1

This comparative example was intended for a polyurethane film that is not coated with a pressure-sensitive adhesive (adhesive coating area 0%), that is, a polourethane film prepared in the same manner as in the above example as a comparative example, the physical properties (moisture-permeability and thickness ) Was measured in the same manner as in the Examples. And the result is shown in the following [Table 1].

Comparative Example 2

Except for coating the adhesive on the entire surface of the polyurethane film with a film coater (100% adhesive coating area) was carried out in the same manner as in the above example, the physical properties (moisture permeability and thickness) also measured in the same manner as in the It was. And the result is shown in the following [Table 1].

Comparative Example 3

As the comparative example, a commercially available adhesive tape of M company (100% of adhesive coating area, trade name: "Tegaderm") was used. Physical properties were measured in the same manner as in Example, and the results are shown in the following [Table 1].

                      <Measurement result of adhesive tape> division Permeability (g / ㎡ / 24hr) Polyurethane Film Thickness (㎛) Adhesive tape thickness (㎛) Adhesive coating area (%) Example 1 2800 20 45 10 Example 2 2400 20 45 30 Example 3 2000 20 45 50 Example 4 1500 20 45 70 Example 5 1000 20 45 90 Comparative Example 1 3000 20 20 0 Comparison boy 2 650 20 45 100 Comparative Example 3 450 25 50 100

As can be seen in Table 1, the smaller the pressure-sensitive adhesive coating area, the higher the moisture permeability. From this, it can be seen that by adjusting the pressure-sensitive adhesive coating area, it is easy to control the moisture permeability of the entire pressure-sensitive adhesive tape. In addition, when comparing Examples (1 to 5) of the above [Table 1] and Comparative Examples 2 and 3, Comparative Examples 2 and 3, the entire coating of the pressure-sensitive adhesive shows a significantly low moisture permeability, Example 1 of the present invention ~ 5) can be seen to have an excellent moisture permeability.

As described above, the present invention has waterproofness and sufficient adhesive force by the net coated surface 25 continuously connected to the gas by the pressure-sensitive adhesive uncoated surface 15 to have high moisture permeability and continuously. This, in turn, promotes wound healing, prevents invasion of the stratum corneum and invasion of water, thereby preventing secondary skin injuries.

1 is a plan view of a medical adhesive tape according to the prior art.

Figure 2 is a plan view of a medical adhesive tape according to a first embodiment of the present invention, showing a state in which the adhesive is coated in a straight line form.

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is a plan view of the medical adhesive tape according to a second embodiment of the present invention shows a state in which the adhesive is coated in a curved form.

Figure 5 is a plan view of the medical adhesive tape according to a third embodiment of the present invention is a coating to have a circular non-coated surface.

<Description of Symbols for Main Parts of Drawings>

10: base sheet 15: adhesive uncoated surface

20: adhesive 25: adhesive coating surface

 d: gap between adhesive coated surfaces

Claims (5)

In the medical adhesive tape coated with the adhesive 20 on the base sheet 10, Medical adhesive tape, characterized in that the adhesive 20 is coated in a net shape. The medical adhesive tape according to claim 1, wherein the net form is a shape of a continuous straight line, a curve, a circle, or a combination thereof. The medical adhesive tape according to claim 1 or 2, wherein an adhesive (20) is coated on the edge of the base sheet (10). The medical adhesive tape according to claim 1 or 2, wherein the net adhesive coating surface (25) is in the range of 10 to 90% of the total area of the adhesive tape. The medical adhesive tape according to claim 1 or 2, wherein the base sheet (10) is a polyurethane film, and the pressure-sensitive adhesive (20) is an acrylic pressure-sensitive adhesive.