TWM653052U - Medical patch for elbow or knee joint - Google Patents

Abstract

To provide a medical patch having elasticity following body movements, satisfactory attachment and less skin irritation, even though the patch is placed over bending portions of the body where joints are to be repeatedly stretched and bent, and even though the patch is applied to wide areas of the boy.

A medical patch having a backing film, an adhesive layer covering the surface of the backing film and a pad arranged over the adhesive layer, wherein the backing film has an area of 4,700 to 13,000 mm², the pad has an area of 1,500 to 4,500 mm², a continuous extension-recovery rate A (approach path) when 20-times extension with the load of 15N has been done is 90% or more, a continuous extension-recovery rate B (return path) is 70% or more, and a value of the B/A rate of the extension-recovery rate is 0.5 or more, in the portion where the backing film, the adhesive layer and the pad are laid over to each other.

Description

A medical adhesive dressing for elbow or knee joints

This invention relates to an adhesive dressing suitable for skin trauma areas, especially a medical adhesive dressing that has good adhesion and low skin irritation in bent parts such as elbows and knees.

Medical adhesive dressings, especially first-aid bandages, need to be able to protect the wound site from the outside, and at the same time, they must have the flexibility, followability, and stretchability to follow the skin's curved surface and joint movements.

First aid bandages are usually composed of tape and pads, and most of the pads have a structure composed of a non-woven fabric that can absorb exudate from the wound site, and a mesh layer used to prevent the non-woven fabric from adhering to the wound site.

In conventional products, the above-mentioned mesh layer used to prevent adhesion is usually made of polyethylene material, but the pad composed of a combination of non-woven fabric and polyethylene mesh layer has almost no stretchability. Therefore, when a first-aid bandage using such a pad is applied to a trauma site, if the pad is stretched due to joint movement, etc., the pad will have a stretched shape without returning to its original size, resulting in The pad lifts up from the adhesive area, or even the bandage peels off. In addition, since the pad located in the center of the emergency bandage is not stretchable, the irritation to the skin around the tape will increase.

As a proposal for the stretchability of a pad that has been studied so far, for example, Patent Document 1 proposes a stretchable bandage made of a nonwoven fabric and a stretchable covering fabric (knitted fabric), wherein the nonwoven fabric is composed of a stretchable base fabric and high-shrink cotton.

Patent Document 2 proposes a first-aid bandage that can follow the shape of the human body even when the pad is applied. The elongation modulus and elongation recovery rate of both the support film and the pad are studied.

In Patent Document 3, a wound surface pad is proposed. As a wound surface pad that has conformability and stretchability and is difficult to stick to the wound surface of the skin, the pad is equipped with a stretchable absorbent material. The liquid layer and the resin layer having an opening define a 50% elongation strength in one direction.

[Prior technical literature]

Patent Literature

Patent Document 1: Japanese Patent Application Laid-Open No. 9-154871

Patent document 2: Japanese Patent Publication No. 2007-117513

Patent document 3: Japanese Patent Publication No. 2012-081045

When the first-aid bandage is applied to a curved part of the body while flexing and extending the joint, if the size of the first-aid bandage is smaller, it can be considered that the discomfort to the adhered area is smaller and the impact on the pad's stretchability is smaller. However, when the size of the emergency bandage is larger, if the pad has lower elasticity, This may cause discomfort at the adhesive site, leakage of blood and exudate due to lifting of the pad, increased skin irritation, etc., and the bandage may even peel off due to tripping.

However, in the proposals for bandages that have been studied so far, there are no reports on adhesion and skin irritation when applied to areas with large flexion and extension movements (such as elbows and knees), nor are there detailed studies on the size of the support or pad in the first aid bandage that can cover such areas, or the shape of the bandage.

In view of the above-mentioned issues, the purpose of this creation is to provide a medical device for bending parts where joints are repeatedly flexed and extended, which has elasticity that can follow the movement even if the application surface is large, has good adhesion, and has little irritation to the skin. Adhesive dressing.

In order to solve the above problems, the present inventors conducted in-depth research and found that in medical adhesive dressings with large adhesive areas, the elongation recovery rate after repeated stretching of the adhesive dressing is the value that achieves good adhesion and low skin One of the irritating factors.

In addition, in this adhesive dressing, the shape of the tape, the area and configuration of the tape and pad are all important.

That is, this creation provides the following implementation form (1).

(1) The present invention relates to a medical adhesive dressing, comprising a support body, an adhesive layer covering the surface of the support body, and a pad disposed on the adhesive layer, wherein the support body has an area of 4,700 to 13,000 ^mm2 , the pad has an area of 1,500 to 4,500 ^mm2 , and in the overlapping portion of the support body, the adhesive layer and the pad, when stretched 20 times under a load of 15N, the continuous elongation recovery rate A (forward path) is greater than 90%, and the continuous elongation recovery rate B (return path) is greater than 70%, and the ratio of these elongation recovery rates B/A is greater than 0.5.

According to this invention, the following implementation forms (2) to (9) are further provided.

(2) In the aforementioned medical adhesive dressing, the aforementioned pad includes a laminated structure of a polyester non-woven fabric layer and a stretchable mesh layer.

(3) In the aforementioned medical adhesive dressing, the weight of the polyester non-woven fabric layer in the aforementioned dressing pad is 50~150g/m ² .

(4) In the aforementioned medical adhesive dressing, the aforementioned support is a polyurethane film or polyurethane non-woven fabric.

(5) In the aforementioned medical adhesive dressing, the area ratio of the aforementioned support body to the aforementioned pad is support body area: pad area = 3:1~2:1.

(6) In the aforementioned medical adhesive dressing, the area ratio of the aforementioned support body to the aforementioned pad is support body area: pad area = 3:1~2.5:1.

(7) In the aforementioned medical adhesive dressing, in the overlapping portion of the aforementioned support body, the aforementioned adhesive layer and the aforementioned pad, the 30% tensile load (MD) is 5~50N/25mm, and the 30% tensile load (CD) is 3~50N/25mm.

(8) In the medical adhesive dressing, the support body has a substantially square or substantially quadrangular shape, and has recessed portions at four corners of the substantially square or substantially quadrangular shape, and the shortest distance between the recessed portion and the dressing pad is 10 to 25 mm.

(9) The aforementioned medical adhesive dressing is an adhesive dressing for joints.

Since the elongation recovery rate of the medical adhesive dressing of this invention meets the specified value after repeated stretching for many times, it can provide a kind of adhesive dressing with a large area that can be adhered to repeated flexion and extension parts, and still has good adhesion to the skin. Adhesive dressings that are less irritating.

For adhesive dressings (bandage bandages) that use pads with no or insufficient stretchability, the difference in stretchability between the pad and the tape, which does not pose a problem for adhesive dressings with a smaller area, gradually has an impact as the shape of the adhesive dressing (and pad) increases. The farther away from the center of the adhesive dressing, the greater the stress applied to the periphery (edge) of the tape. If the stretchability of the pad and the tape is different, the farther away from the center, the greater the difference in stretchability, the greater the stress generated, and the higher the risk of skin irritation.

In this regard, the medical adhesive dressing of the present invention has the above-mentioned elasticity, that is, not only the so-called tape part composed of the support body and the adhesive layer, but also the pad part has elasticity, so it can relax the above-mentioned stress. Therefore, it is possible to provide an adhesive dressing that can reduce the risk of skin irritation even when applied to a large area.

In addition, in the medical adhesive dressing of this invention, since a structure with a high continuous stretch recovery rate is adopted, the deformation rate of the tape and pad is low even if it is bent and stretched many times, and the medical adhesive dressing of this invention is easy to maintain the original shape. Therefore, the medical adhesive dressing of this invention is less likely to cause warping or loosening due to deformation, and it can be expected that the comfort during the adhesion period can be improved, and it is easy to maintain a high adhesion rate even in the case of low adhesion.

In addition, as mentioned above, in the case of adhesive dressings attached to curved parts such as elbows and knees, when the shape becomes larger, the stress applied to the periphery (edge part) becomes greater the farther away from the center of the adhesive dressing, and the skin is easily irritated and peeled off due to the movement of the elbows and knees.

In the medical adhesive dressing of this invention, especially in the approximately square and approximately quadrangular adhesive dressing, recesses are provided at the four corners, and the shortest distance between the recess and the dressing pad provided on the tape (adhesive layer) is set It is a specified value and further relaxes the stress exerted on the periphery (edge area).

1: Medical adhesive dressing

2: Support body

21: Concave part

22:dent

3: Adhesive layer

4:Pad

41: Non-woven fabric layer

42: Scaling network layer

5: Release pad

6: Carrier film

7: Tape

Figure 1 is a diagram (cross-sectional view) showing one implementation form of the medical adhesive dressing of this invention.

FIG. 2 is a diagram (cross-sectional view) showing another embodiment of the medical adhesive dressing of the present invention.

Figure 3 is a diagram showing one implementation form of the medical adhesive dressing of this invention (front view).

Figure 4 is a diagram showing another embodiment of the medical adhesive dressing of the present invention (front view).

FIG. 5 is a diagram (front view) showing another embodiment of the medical adhesive dressing of the present invention.

FIG. 6 is a diagram (front view) showing another embodiment of the medical adhesive dressing of the present invention.

Figure 7 is a diagram showing another embodiment of the medical adhesive dressing of the present invention (front view).

[Medical adhesive dressing]

The medical adhesive dressing of the present invention has an adhesive layer covering the surface of the support and a pad arranged on the adhesive layer, and has the form of a so-called bandage.

The medical adhesive dressing of the invention is characterized in that the size of the adhesive dressing itself is larger than that of the conventional product (bandage), that is, the area of the supporting body is 4,700~13,000mm ² , and the area of the pad is 1,500~4,500mm ² .

Furthermore, the medical adhesive dressing of the present invention is characterized in that the overlapping portion of the support, the adhesive layer, and the dressing pad has a higher recovery rate from elongation, as described below.

<Elongation recovery rate>

The elongation recovery rate specified in this work refers to the continuous elongation recovery rate A (forward path) and continuous elongation recovery rate B (return path) when the target is stretched 20 times with a load of 15N. These data are measured according to the procedures of "JIS L 1096 Fabric Testing Methods for Woven and Knitted Fabrics".

Specifically, the test piece is first placed on a tensile testing machine or a device with the same performance.

An initial load (for example, a load corresponding to a gravity corresponding to a length of 1 m in the width of the test piece) is applied to the test piece. At this time, the length of the test piece (chuck pitch) when the initial load is applied for the first time (forward path) is measured. )(Initial load variation point in the forward path before the first cycle: L _1a ').

Next, stretch the test piece until a load of 15 N is applied, then immediately remove the load (load 0 N) and return to the initial position. Then, repeat the load application (15 N) and removal (0 N) for a total of 20 times (20 cycles) of test piece extension and contraction. The following test piece lengths were measured respectively, namely, the test piece length when the aforementioned initial load was applied (forward path) when the load was applied for the 20th time (the initial load variation point in the forward path of the 20th cycle: L _20a '), the test piece length when a load of 15N was applied (the upper limit variation point when the specified load was reached in the 20th cycle: L ₂₀ ), and the test piece length when the aforementioned initial load was reached when the load was removed (return path) (the initial load variation point in the return path of the 20th cycle: L _20b ').

Based on these measured values, the continuous elongation recovery rate A when a load is applied (forward path) and the continuous elongation recovery rate B when the load is removed (return path) are defined as follows.

L ₂₀ : The upper limit variation point when the specified load is reached in the 20th cycle (the chuck distance when a 15N load is applied in the 20th time)

L _1a' : The initial load variation point in the forward path of the first cycle (the chuck distance when the initial load is applied for the first time)

L _20a' : Initial load variation point in the forward path of the 20th cycle (the distance between the chucks when the initial load is applied for the 20th time (when the load is applied))

L _20b' : Initial load variation point in the return path of the 20th cycle (the distance between the chucks when reaching the initial load for the 20th time (when removing the load))

This invention is characterized in that, in the overlapping part of the support body, adhesive layer and pad of the medical adhesive dressing, the continuous elongation recovery rate A (forward path) is more than 90%, the continuous elongation recovery rate B (return path) is more than 70%, and the ratio of these elongation recovery rates B/A is more than 0.5.

In addition, in the present invention, in at least one of the length (MD) direction and the width (CD) direction of the overlapping portion (medical adhesive dressing), the continuous elongation recovery rate in the overlapping portion is: the continuous elongation recovery rate A is 90% or more, the continuous elongation recovery rate B is 70% or more, and the ratio of these continuous elongation recovery rates B/A is 0.5 or more. In addition, regardless of the MD and CD directions, it is better to satisfy the above-mentioned continuous elongation recovery rate A, continuous elongation recovery rate B, and B/A values.

Below, this creation is further explained.

<Support>

When the medical adhesive dressing described below is formed, the supporting body constituting the medical adhesive dressing of the present invention only needs to have the elasticity to achieve the specified elongation recovery rate, and there is no special restriction on its material, shape, and structure.

The area of the support body is 4,700~13,000mm ² , and the appropriate size can be determined according to the area of the applicable part (wound part) and the like.

The shape of the above-mentioned support body (i.e., medical adhesive dressing) is not particularly limited, and can be square (square, rectangular, etc.), quadrilateral (trapezoid, rhombus, etc.), polygon, circle, ellipse, semicircle, triangle, crescent, and shapes formed by combining them, etc., and various shapes can be selected according to the adhesive position. In addition, when the shape is a shape with corners, such as square, quadrilateral, polygon, etc., by providing chamfer R at the corner (when the entire surface of the support body is provided with adhesive), it can be suppressed from peeling off from the adhesive position.

An example of the best form is a substantially square or substantially quadrilateral shape based on a square or a quadrilateral.

Examples of the support include flexible supports such as laminates of two or more types such as films, foams, nonwoven fabrics, knitted fabrics, woven fabrics, and laminated composites of nonwoven fabrics and films.

As materials of these supports, for example, polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polystyrene, nylon, rayon acetate, rayon, rayon/polyethylene terephthalate composite, polyacrylonitrile, polyvinyl alcohol, acrylic polyurethane, ester polyurethane, ether polyurethane, styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene-propylene-styrene copolymer, styrene-butadiene rubber, ethylene-vinyl acetate copolymer, cellophane, etc. as essential components can be cited.

Among them, films, foams, nonwovens, wovens, knitted fabrics, etc. made of polyester, polyurethane, polyethylene, polypropylene, polyamide, acrylic resin, etc. are preferred.

Among them, in addition to the aforementioned stretchability, materials that can conform to the skin, have flexibility that can follow the movements of the skin and joints, and can suppress the occurrence of rashes on the skin after being stuck for a long time are preferred. Just stick it on Films or non-woven fabrics made of polyurethane are better for following the movement of the skin surface and having excellent elasticity that can follow joint flexion and extension.

In addition, in order to make the medical adhesive dressing inconspicuous when pasting, the support body is colored with skin color or other tones using colorants such as pigments, organic pigments, and natural pigments, which can reduce the difference in color with the skin when pasting. In addition, from the perspective of easily showing the skin color under the paste, a plastic film with excellent transparency can be used.

The thickness of the support can be appropriately selected by considering physical properties such as elongation, tensile strength, operability, touch during application, and adherence to the affected area, and is usually about 5μm~1mm. In addition, when the thickness of the support is extremely thin, about 5μm~30μm, the carrier film described later can also be provided on the opposite side of the support with the adhesive layer (hereinafter referred to as the other side).

When the support is made of cloth such as non-woven fabric, the thickness is preferably 50 μm to 1 mm, more preferably 70 μm to 800 μm, and most preferably 100 μm to 700 μm.

In addition, when the support is a plastic film, its thickness is preferably 10 μm ~ 300 μm, more preferably 12 μm ~ 200 μm, and most preferably 15 μm ~ 150 μm. In addition, when the support is a film, in order to improve the anchorage between the adhesive layer and the support, sand blasting, corona treatment, etc. can be performed on one side of the support, the other side, or both sides.

When the thickness of the above-mentioned support body is less than 5 μm, the strength and operability of the support body itself are reduced, and it is difficult to adhere to the skin. It may be damaged due to contact with other components, etc., or may be damaged due to contact with water such as bathing. It peels off the skin within a short period of time upon contact. In addition, when the thickness of the support is too large (exceeding 1 mm), it becomes difficult to follow the movement of the skin when it becomes an adhesive dressing, and it is easy to peel off from the edge of the adhesive dressing. Therefore, it may be peeled off from the skin in a short time, or the adhesive dressing time may be increased. feeling of discomfort.

Among them, when non-woven fabric is used as the support, its weight is usually 10g/m ² ~100g/m ² . From the perspective of improving the moisture permeability of medical adhesive dressings and maintaining the strength to easily adhere to the skin, 15g/m ² ~80g/m ² is preferred, and 20g/m ² ~70g/m ² is more preferred. When the weight of the nonwoven fabric is less than 10g/ ^m2 , the stretchability of the nonwoven fabric becomes too large, which may worsen the operability of the medical adhesive dressing. In addition, the adhesive may leak out to the other side of the support (nonwoven fabric). In addition, when the weight exceeds 100g/ ^m2 , the stretchability of the nonwoven fabric is too small, the operability becomes poor, the moisture permeability of the medical adhesive dressing decreases, and the skin irritation may become greater, which may cause discomfort to the skin during application. feel.

Among these supports, the moisture permeability measured in JIS Z0208, 40°C, 90%RH is preferably 1,000g/m ² ． 24h, more preferably 2,000g/m ^{2 ．} 24h or more, and most preferably 3,000g/m ² ． 24h or more. By setting the moisture permeability to 1,000g/m ² ． 24h or more, there is less stuffiness when sticking to the skin, and it is less likely to cause skin irritation and itching during sticking. The higher the moisture permeability, the better. There is no particular upper limit for excellent moisture permeability, but it is usually 30,000g/m ² ． 24h or less.

In addition, as the above-mentioned carrier film that can be disposed on the other side of the support, a well-known carrier film can be used, for example, polyurethane, polyethylene, polypropylene, ionomer, polyamide, polyvinyl chloride, It is preferable to form various films made of various thermoplastic resins such as polyvinylidene chloride, ethylene vinyl acetate copolymer, thermoplastic polyester, polytetrafluoroethylene, and the like. In addition, the various membranes mentioned above can also be Use the film laminated on paper.

The carrier film formed by these various films is preferably thick or made of a tough material. The thickness of the carrier film can be appropriately set, usually above 10μm, preferably above 20μm, and the upper limit is about 500μm.

In addition, the carrier film is a film that is peeled off from the support body after the medical adhesive dressing of this invention is adhered to a predetermined part. Therefore, in order to facilitate the peeling, the carrier film can be half-cut or a portion that does not adhere to the surface of the support body (pre-lifted portion) can be provided, or a tape tearing notch that makes it easy to tear off the carrier film can be provided near these half-cut and pre-lifted portions.

In addition, the support may contain additives such as antistatic agents and anti-ultraviolet agents as long as the effects of the invention are not hindered. Examples of antistatic agents include surfactants (anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants). Antistatic agents can eliminate support anchorage and process defects.

<Adhesive layer>

The above-mentioned adhesive layer may be composed of a single adhesive layer, or may be composed of a plurality of laminated adhesive layers. When the adhesive layer is formed by laminating a plurality of adhesive layers, it may be formed by laminating different types of adhesive layers.

In addition, the adhesive layer is formed to cover the surface of one side of the support. It is preferably formed on the entire surface. However, as long as the effect of the present invention is not impaired, it may also be formed partially on that side. When the adhesive layer is partially formed, any form such as grid, mesh, granular, arabesque, etc. can be selected. By forming the adhesive layer partially in this way, the air permeability, moisture permeability, etc. of the tape (a laminate of the support and the adhesive layer) can be further improved, and it can also be adjusted (reduced). Irritation when peeled from skin.

In this invention, as the adhesive forming the adhesive layer, it is preferable to select an adhesive containing at least one of acrylic adhesives, rubber adhesives, polyurethane adhesives and silicone adhesives. These adhesives may be used individually by 1 type, or in mixture of 2 or more types. Among them, acrylic adhesives or polyurethane adhesives are preferred from the viewpoint of having sufficient adhesion to the skin surface, causing little irritation to the skin, and having high moisture permeability.

Examples of the acrylic adhesive include homopolymers containing (meth)acrylic acid alkyl ester monomers such as butyl acrylate, 2-ethylhexyl acrylate, and isononyl acrylate, or copolymers of these monomers. , In addition, (meth)acrylic acid, hydroxyalkyl (meth)acrylate, vinyl acetate, styrene, vinylpyrrolidone, (meth)acrylamide, alkoxyalkyl (meth)acrylate etc., adhesives of copolymers of other monomers that can be copolymerized with the aforementioned alkyl (meth)acrylate monomer.

As the above-mentioned polyurethane adhesive, there can be cited an adhesive composed of a polyurethane resin obtained by reacting a polyol with a polyisocyanate compound. The polyol can be a polyether polyol, a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol, etc. The polyisocyanate compound can be diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, etc.

The NCO/OH molar ratio of the polyol and the polyisocyanate compound used in the aforementioned reaction is preferably 0.70/1.00~1.00/1.00 in order to suppress gelation during the reaction and increase the adhesion.

The production of polyurethane adhesives can be carried out by general methods such as bulk polymerization (solid state reaction) method and solution polymerization method in a molten state. Specifically, the solvent used in the solution polymerization method can be ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, ester solvents such as ethyl acetate and butyl acetate, ether solvents such as dioxane and tetrahydrofuran, glycol ether solvents such as solvent and carbitol, acetate glycol ether solvents such as solvent acetate, amide solvents such as dimethylacetamide and dimethylformamide, aromatic hydrocarbon solvents such as toluene and xylene, alcohol solvents such as methanol, ethanol, and isopropyl alcohol, and mixed solvents thereof.

When manufacturing polyurethane adhesives, catalysts and additives can be used as needed. Catalysts can be general urethane catalysts such as nitrogen-containing compounds such as triethylamine and triethylenediamine, organic metal compounds such as dibutyltin dilaurate, tin octanoate, and tin stearate. Additives can be, for example, ultraviolet absorbers such as substituted benzotriazoles, antioxidants such as phenol derivatives, and anti-hydrolysis agents.

In order to improve the adhesion of polyurethane adhesives and avoid problems such as adhesive residue, chain extenders can be used in the production of the aforementioned polyurethane adhesives. In addition, polyurethane adhesives can be combined with polyisocyanate curing agents to change the adhesive properties. The use of polyisocyanate curing agents to improve adhesion can effectively improve adhesive residue and other undesirable conditions. As the polyisocyanate used as the curing agent, the polyisocyanate used in the aforementioned reaction can also be used. Polyol adducts of isocyanates obtained by reacting these with bifunctional or higher polyols are preferred. In addition, polymerized polyisocyanates, isocyanureas Acid ester denatured form and carbodiimide denatured form are also suitable. Specifically, Tosoh Corporation's CORONATE L, CORONATE HL, CORONATE 3041, CORONATE 2030, CORONATE 2031, CORONATE HX, Millionate MTL, Millionate MR et al.

As any component of the above-mentioned adhesive layer, it may contain a tackifier, a cross-linking agent, a softener (plasticizer), a pH adjuster, an antioxidant (an antioxidant, a preservative), a filler, an ultraviolet absorber, and a coloring agent. Agents and spices, etc., are generally additives that can be matched with the adhesive layer.

The thickness of the above-mentioned adhesive layer can usually be 10 μm ~ 200 μm, preferably 20 μm ~ 100 μm.

<Pad>

The pad (also called a stretchable dressing pad) constituting the medical adhesive dressing of the present invention, when constituting the medical adhesive dressing described below, only needs to have stretchability that can achieve a predetermined elongation recovery rate, and the material, shape, and The structure is not particularly limited.

The area of the above pad is 1,500 to 4,500 mm ² , and the appropriate size can be determined according to the area of the application site (wound site), etc.

The pad can be made of special woven fabrics, gauze, mesh, non-woven fabrics, and laminates thereof, among which a laminated structure pad (stretchable pad) in which a stretchable non-woven fabric layer with excellent liquid absorption is bonded to a stretchable mesh layer (the contact layer with the application surface) is preferred. The aforementioned non-woven fabric layer and the stretchable mesh layer can be bonded (joined) by, for example, heat fusion (using a gravure roller).

When the pad is composed of a non-woven fabric layer and a stretchable mesh layer, the pad is configured in such a way that the adhesive layer is connected to the non-woven fabric layer.

The aforementioned stretchable nonwoven fabric layer is made of, for example, polyester, rayon, polyolefin, etc., and may contain curled fibers.

In addition, the above-mentioned stretch mesh layer may be composed of, for example, polystyrene elastomer, polyolefin, vinyl chloride, polyurethane, polyester, polyamide, or polybutadiene resin.

The shape of the above-mentioned pad is not particularly limited, and can be square (square, rectangular, etc.), quadrilateral (trapezoid, rhombus, etc.), polygon, circle, ellipse, semicircle, triangle, crescent, and shapes formed by combining them, etc. Various shapes can be selected according to the adhesion site.

In addition, in the above-mentioned pad, the basis weight (basis basis) of the non-woven fabric layer can be 50 to 150g/m ² , preferably 70 to 140g/m ² , for example, it can be 80 to 120g/m ² . Setting the weight to 50g/ ^m2 or more will allow for appropriate water absorption, and setting it to 150g/m2 ^or less will reduce shedding even when the pad contains moisture due to bathing, water-related work, etc. possibility.

In addition, the thickness of the stretch pad with a non-woven fabric layer/stretch mesh layer laminated structure can be 0.5~2.0mm, preferably 0.7~1.5mm.

In addition, the above-mentioned dressing pad may be infiltrated with a bactericide in advance to perform sterilization, or may be made into a finished product (medical adhesive dressing) and then be sterilized.

<Release pad>

In the medical adhesive dressing of the present invention, a release pad (also called a release layer or release paper) may be provided to protect the adhesive layer and the pad until use, and the state of having the release pad may also be included in the medical adhesive dressing of the present invention.

The above-mentioned release liner can use products commonly used in the field of tape and adhesive technology. For example, plastic films such as polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polypropylene (unstretched, stretched, etc.), polyethylene, polyurethane, polyvinyl chloride, polystyrene, etc.; papers or synthetic papers such as high-grade paper, translucent paper, parchment paper, kraft paper, etc.; release-processed papers with release agents such as silicone resins and fluororesins having release properties applied to the aforementioned plastic films, papers, synthetic papers, synthetic fibers, etc.; aluminum foils; laminated papers formed by various laminations of these films and sheets, and laminated release papers with release agents applied to the laminated papers, etc., and other colorless or colored sheets. In addition, the release liner can also be provided with projections and depressions to facilitate its removal from the packaging material.

The thickness of these release pads is not particularly limited, but is usually 10μm~1mm, for example 20μm~500μm, preferably 40μm~200μm.

The shape of the release liner can be square, rectangular, circular, etc., and the corners can be turned into round shapes as needed. Its size can be the same as or slightly larger than that of the aforementioned medical adhesive dressing support. The release liner can be composed of one sheet or divided into multiple sheets, and its secant lines can be composed of straight lines, wavy lines, or hole lines, or the release liners can be partially overlapped with each other.

<Manufacturing method>

The manufacturing method of the medical adhesive dressing that is the subject of this invention is not particularly limited, and can be manufactured by imitating the manufacturing method of conventional bandages and adhesive dressings. For example, a support body and an adhesive layer are first laminated to form a tape, and a pad is arranged on the adhesive layer of the tape, thereby manufacturing a medical adhesive dressing.

Specifically, for example, a solution or emulsion of an adhesive (synthetic resin) is coated on engineering paper coated with a silicone release agent to form an adhesive layer, and then the adhesive layer and the support volume layer are combined to produce an adhesive tape. The above-mentioned engineering paper refers to the paper and film used in the manufacturing process. It does not leave any residue in the product. This is a general term for items to be stored. Films and papers exemplified in the above <Release Liner> can be used. In addition, if necessary, the adhesive layer can be foamed after applying the adhesive to form a layer containing synthetic resin and having breathability, and it is preferred to form a foamed adhesive layer.

Next, the engineering paper of the tape is peeled off to expose the adhesive layer, and the pad cut to an appropriate size is arranged at a specified position (for example, in the approximate center of the adhesive dressing when used as a medical adhesive dressing). Usually, a release liner is further arranged in a manner covering the adhesive layer and the pad, and then cut into a specified shape, thereby obtaining a medical adhesive dressing having a support body/adhesive layer/pad/release liner layered structure. In addition, when a carrier film is provided on the surface of the support body on the opposite side of the adhesive layer, a laminated structure adhesive dressing having a carrier film/support body/adhesive layer/pad/release pad can be produced.

Usually in the subsequent manufacturing process, the medical adhesive dressing is sealed in a packaging paper formed by paper, plastic film or such composite materials at room temperature to make a product. At this time, sterilization treatment can be carried out as needed.

The following diagram shows the appropriate form of this creation and further explains this creation.

Figures 1 and 2 are diagrams (cross-sectional views) showing an implementation form of the medical adhesive dressing of this invention.

As shown in FIG. 1 , the medical adhesive dressing 1 of the present invention includes a support 2 , an adhesive layer 3 covering the surface of the support 2 , and a dressing pad 4 arranged on the adhesive layer 3 . In addition, in this form, the adhesive layer 3 is formed over the entire support body 2 , thereby having the form of an adhesive tape 7 .

The pad 4 has a laminated structure composed of a non-woven fabric layer 41 and a stretch mesh layer 42 , and the non-woven fabric layer 41 is in contact with the adhesive layer 3 .

FIG2 is a diagram showing a further embodiment of the embodiment of FIG1 with a release pad 5 and a carrier film 6.

As shown in FIG2 , the release pad 5 is configured in the form of a stretchable mesh layer 42 covering the adhesive layer 3 and the pad 4. In FIG2 , the release pad is composed of multiple sheets (2 sheets).

In addition, the carrier film 6 is arranged on the other side of the support body 2 having the adhesive layer 3.

Figures 3 to 7 are diagrams showing other embodiments of the medical adhesive dressing 1 of the present invention. These diagrams correspond to the front view of the medical adhesive dressing 1 shown in Figure 1.

As shown in Figures 3 to 7, the medical adhesive dressing 1 of the present invention has a rectangular pad 4 disposed approximately in the center of a roughly rectangular support body 2 (forming an adhesive tape 7 together with an adhesive layer 3).

In the configuration shown in FIG. 3 , the four corners of the roughly quadrilateral support body 2 have recesses 21 disposed toward the inner side of the support body 2. Due to the presence of the recesses 21, the distance between the four corners of the pad 4 and the four corners of the support body 2 can be shortened compared to when there are no recesses 21.

As mentioned above, the farther away from the center of the adhesive dressing, the greater the stress applied to the periphery (edge portion). Therefore, the presence of the recessed portion 21 can relax the stress applied to the periphery (edge portion).

However, the shape (size) of the recessed portion 21 should not impair the adhesion of the medical adhesive dressing 1. Consider the size of the medical adhesive dressing of this invention (support area: 4,700~13,000mm ² , pad area 1,500~4,500mm ² ). When , it is better to set the shortest distance C _L between the recess 21 and the pad 4 to be 10 to 25 mm. The shape of the recessed portion 21 is not particularly limited, but taking into account the difficulty of peeling off the adhered portion, a shape having a chamfer R is preferred.

Furthermore, in the form shown in FIG. 3 , in order to disperse the stress applied to the periphery (edge portion) of the medical adhesive dressing 1 , a recess 22 is provided in the support body 2 facing inward in the longitudinal direction. By providing the recesses 22 in the length direction, stable adhesion can be ensured regardless of the size of the adhesion site (wound site) or the adhesion position (adhesion direction).

In the configurations shown in FIGS. 5 to 7, although there is no recess 21 as shown in FIG. 3 in the roughly quadrilateral support body 2, there is one recess 22 in the configurations of FIGS. 5 and 7 and two recesses in the configuration of FIG. 6 toward the inner side of the length direction of the support body. As mentioned above, by providing the recess 22 in the length direction, stable adhesion can be ensured regardless of the size of the pasting part (wound part) and the pasting position (pasting direction).

[Implementation example]

Implementation examples and comparison examples will be shown below to specifically explain this invention, but this invention is not limited to these implementation examples.

In addition, the pad used in the medical adhesive dressing of the following Examples 1 to 4 has a laminated structure of a nonwoven fabric layer and a stretch net layer (weight of the nonwoven fabric layer: 90 g/m ² ) by bonding a polystyrene elastic net constituting a stretch layer to a rolled polyester nonwoven fabric layer by welding.

[Implementation Example 1~Implementation Example 3: Production of Medical Adhesive Dressing (1)]

<Production of tape using acrylic adhesive>

An acrylic adhesive [a product obtained by reacting 100 parts by mass of 2-ethylhexyl acrylate/vinyl acetate. acrylic acid (mass ratio 87/10/3) with 0.03 parts by mass of an epoxy crosslinking agent (TETRAD X, manufactured by Mitsubishi Gas Chemical Co., Ltd.)] was applied to silicone treated engineering paper to a dry film thickness of 40 g/ ^m2 . As a breathable treatment, distilled water was sprayed on the undried adhesive coated surface, and then heated at 130°C to form fine pores, forming an adhesive layer composed of a breathable acrylic adhesive.

A polyurethane elastic fiber nonwoven fabric (thickness 200 μm, weight 65 g/m ² ) as a support was bonded to the adhesive layer to produce an adhesive tape.

<Preparation of medical adhesive dressings (1)>

The engineering paper is peeled off from the tape to expose an adhesive layer made of a breathable acrylic resin. Place the pad cut into the specified size on the adhesive layer so that the adhesive layer of the tape is opposite to the non-woven layer of the pad.

A silicone-treated release liner is then applied over the tape and pad.

After that, a hole of a specified size and shape is punched so that the pad is located approximately in the center, and the medical adhesive dressing of each embodiment is obtained. In addition, the medical adhesive dressings of Embodiment 1, Embodiment 3 and Embodiment 4 are in the shape shown in FIG3, and the medical adhesive dressing of Embodiment 2 is in the shape shown in FIG4.

[Example 4: Production of medical adhesive dressings (2)]

<Production of tape using polyurethane adhesive>

100 parts by mass of polyurethane adhesive (polyether) and 2 parts of cross-linking agent (CORONATE L, Tosoh Co., Ltd.) were evenly mixed and defoamed, and then placed on a peeled polyester film (engineering paper, thickness 50 μm), use a knife coater to coat the film with a dry film thickness of 25 μm, and then cure and dry it at 120°C for 3 minutes to form an adhesive layer.

On the obtained adhesive layer, the support surface of the laminated body of the support and the carrier film (support: 20μm thick ether polyurethane resin film substrate (moisture permeability 3,300g/ ^m2.day ), carrier film: 40μm thick polypropylene film) was attached. After that, it was stored in a hot air dryer at 50°C for 5 days to complete the crosslinking reaction of the adhesive, and a tape with a carrier film attached to the construction paper was produced.

<Preparation of medical adhesive dressings (2)>

Follow the same steps as Example 1, peel off the engineering paper, place the padding layer on the tape, attach the silicone-treated release liner to cover the tape and padding layer, and punch holes in a specified size and shape to obtain Medical adhesive dressing of implementation example 4. In addition, the medical adhesive dressing of Embodiment 4 has a shape as shown in FIG. 3 .

[Comparison example 1]

In Comparison Example 1, the product name used as the medical adhesive dressing is: FC Convenient Pad (manufactured by White Cross Co., Ltd., pad size: 40×60mm, tape size: 60×100mm).

[Comparison example 2]

In Comparison Example 2, the product name used as the medical adhesive dressing is: FC Waterproof Convenient Pad (manufactured by White Cross Co., Ltd., pad size: 45×90mm, tape size: 80×130mm).

[Comparison example 3]

On the adhesive tape using the acrylic adhesive used in Example 1, a pad with a laminated structure of non-woven fabric (gram weight: 120g/m ² , rayon, polyester, polyolefin) and polyethylene mesh is attached. Except for this, the same steps as in Implementation Example 1 were followed to obtain the medical adhesive dressing of Comparative Example 3. In addition, the medical adhesive dressing of Comparative Example 3 has a shape as shown in FIG. 4 .

[Comparison Example 4]

On the adhesive tape using the polyurethane adhesive used in Example 4, a pad with a laminated structure of non-woven fabric (gram weight: 120g/m ² , rayon, polyester, polyolefin) and polyethylene mesh is attached. Except for this, the same steps as in Implementation Example 4 were followed to obtain the medical adhesive dressing of Comparative Example 4. In addition, the medical adhesive dressing of Comparative Example 4 has a shape as shown in FIG. 4 .

The sizes and shapes of the medical adhesive dressings of each implementation example and comparative example are shown in Table 1. In Table 1, _WS , _LS , _CL , _WP , and _LP in implementation examples 1 to 4 and comparison examples 3 to 4 respectively correspond to the symbols shown in Figures 3 and 4, that is, _WS represents the width of the support body 2 (adhesive dressing), L _S represents the length of the support body 2 (adhesive dressing), C _L represents the shortest distance between the recess 21 and the dressing pad 4, W _P represents the width of the dressing pad 4, and L _P represents the dressing Pad 4 length.

[Tensile test]

Regarding the medical adhesive dressings of Implementation Examples 1 to 4 and Comparative Examples 1 to 4, a tensile test was performed based on the JIS Z0237 (2009) tape/adhesive sheet test method, and a 30% tensile load was measured. In addition, the 30% tensile load is the stress when the entire length of the tensile target is 100% when it is stretched to 130%.

Each medical adhesive dressing was cut into short strips of 25 mm wide and 50 mm long in the width (CD) direction and the length (MD) direction, and used as test pieces. In addition, the test piece is the overlapping part of the support body, adhesive layer and dressing pad (excluding the release pad and carrier film).

The aforementioned test piece was mounted on a Tensilon universal testing machine with a clamp spacing of 30 mm, and three tensile measurements were performed under a load of 100 N at a temperature of 23°C and a relative humidity of 50%. The average of the three measured values was used as the 30% tensile load of CD and MD respectively.

In addition, in medical adhesive dressings (the overlapping portion of the support, adhesive layer and pad), the 30% tensile load (MD) is preferably 5~50N/25mm, and the 30% tensile load (CD) is 3 ~50N/25mm is better. In a better form, the 30% tensile load (MD) is 5~15N/25mm, and the 30% tensile load (CD) is 3~10N/25mm.

The results are shown in Table 2.

[BA-SUS board adhesion]

The adhesion of the medical adhesive dressings of Implementation Examples 1 to 4 and Comparative Examples 1 to 4 to the BA-SUS board was measured by performing a 180-degree peel test in accordance with JIS Z0237.

Each medical adhesive dressing was cut into short strips with a width of 12 mm and a length of 30 to 150 mm in the length (MD) direction to serve as test pieces. In addition, the test piece used for the adhesion of BA-SUS boards is supported The overlap between the support and the adhesive layer (excluding the application pad, release liner and carrier film). In an environment with a temperature of 23°C and 50% RH, stick the test piece on the BA-SUS board, and press a 1kg rubber roller back and forth twice at a speed of 600±30mm/min. Within 1 minute after crimping, measure the peeling force at a peeling angle of 180 degrees and a peeling speed of 300±20mm/minute to determine the adhesion of the test piece to the BA-SUS board. The measurement was performed three times, and the average value was used as the adhesion force of the adhesive dressing to the BA-SUS plate (unit: N/12mm).

[Elongation recovery rate]

For the medical adhesive dressings of Implementation Examples 1 to 4 and Comparison Examples 1 to 4, repeated tensile measurements were performed to measure the elongation recovery rate.

Each medical adhesive dressing was cut into short strips of 30 mm wide and 50 mm long in the width (CD) direction and the length (MD) direction respectively, and used as test pieces. In addition, the test piece is the overlapping part of the support body, adhesive layer and dressing pad (excluding the release pad and carrier film).

The above-mentioned test piece is fixed with upper and lower clamps with a clamping distance of 30mm and installed in the Tensilon universal testing machine. In an environment with a temperature of 23℃ and a relative humidity of 50%, a specified load (upper limit: 15N) is applied to the sample at a tensile speed of 300±20mm/min. If the specified load is reached, it returns to the initial position (load: 0N) at the same speed. This is repeated 20 times (20 cycles).

The initial load is 0.0001N, and the chuck spacing (length of the test piece) at this time is the initial load variation point, the initial load variation point of the first forward path (when the load is applied) is _L1a ', the initial load variation point of the 20th forward path (when the load is applied) is _L20a ', and the initial load variation point of the 20th return path (when the load is removed) is _L20b '.

In addition, the chuck distance (length of the test piece) when the specified load (15N) is reached is the upper limit variation point, and the upper limit variation point when the specified load is reached for the 20th time is L ₂₀ .

Based on these measured values, the continuous elongation recovery rate A (%) and the continuous elongation recovery rate B (%) are calculated using the following formulas.

In addition, one sample was measured three times (three test pieces were measured respectively), and the average value of the three times was calculated as each continuous elongation recovery rate (%), and the ratio B/A of these was calculated.

The results are shown in Table 2.

L ₂₀ : The upper limit variation point when the specified load is reached in the 20th cycle (the chuck distance when a 15N load is applied in the 20th cycle)

L _1a' : The initial load variation point in the first cycle forward path (the chuck distance when the initial load is applied for the first time)

L _20a' : The initial load variation point in the forward path of the 20th cycle (the chuck spacing when the initial load is applied for the 20th time (when the load is applied))

L _20b' : The initial load variation point in the 20th cycle return path (the chuck spacing when the initial load is reached for the 20th time (when the load is removed))

In addition, as reference values, the elongation recovery rate A (%) and (B) of the first time (first cycle) are shown together in Table 2. In the above formula, the initial load variation point in the forward path of the 20th cycle: L _20a ' is replaced by the initial load variation point in the forward path of the 1st cycle (when the load is applied): L _1a ', the initial load variation point in the return path of the 20th cycle: L _20b ' is replaced by the initial load variation point in the return path of the 1st cycle (when the load is removed): L _1b ', and the upper limit variation point when the specified load is reached in the 20th cycle: L ₂₀ is replaced by the upper limit variation point when the specified load (15N) is reached for the first time: L ₁ , and they are calculated respectively.

[Practical evaluation]

The medical adhesive dressings of the above-mentioned implementation examples 1 to 4 and comparison examples 1 to 4 were applied to the elbows of 10 to 30 adult male and female subjects for 24 hours.

Regarding the application to the elbow, each subject applied the bandage after bathing and continued to apply it for 24 hours after bathing the next day. In addition, with the elbow (arm) stretched, each bandage was applied with the length direction of the bandage oriented to the elbow bending direction (length direction of the arm).

After 24 hours of application, the adhesion before peeling was evaluated according to the following evaluation criteria (score: 1~6), and the average score of all subjects (10~30) was calculated.

Peel off the medical adhesive dressing, visually observe the adhesive area 1 hour after peeling off and 24 hours after peeling off, and evaluate the skin condition according to the following evaluation standards (score: 1 to 6), counting all subjects (10 to 30 people) )'s average rating.

Evaluations with the following average score of 4 or more were classified as ○, and evaluations with less than 4 were classified as ×.

<Adhesion before peeling>

6: All well attached to the elbow

5: Only the edge area peels off (approximately 5~15% of the overall area of the medical adhesive dressing peels off)

4: Although peeling occurred, there was no flaking of the dressing area (about 15~30% of the total area of the medical adhesive dressing peeled)

3: Partial peeling/lifting occurred (about 30~50% of the total area of the medical adhesive dressing peeled)

2: Half to more than half of the dressing peels off/lifts off (more than 50% of the total area of the medical adhesive dressing peels off)

1: Falling off/already peeled off

<Skin reaction>

6: No redness on the skin

5: The skin is slightly red (slightly red)

4: Skin redness (obvious redness)

3: Redness and swelling

2: Causes skin problems (rash/small blisters, etc.)

1: Cause skin problems (rashes/big blisters, etc.)

As shown in Table 1 and Table 2, the medical adhesive dressings of Implementation Examples 1 to 4 meet the conditions of continuous elongation recovery rate A of more than 90% and continuous elongation recovery rate of more than 70%. These medical adhesive dressings have excellent adhesion before peeling. In addition, the skin reaction is weak after 1 hour and 24 hours of peeling, and skin irritation is suppressed.

On the other hand, the continuous elongation recovery rate B of the adhesive dressings of Comparative Example 1 and Comparative Example 2 is 37 to 40%, which is poor compared with the implementation examples. These adhesive dressings all lack adhesion. In addition, Comparative Example 1 is a relatively small preparation, so it causes less skin irritation. However, Comparative Example 2, which is about the same size as the adhesive dressing of the Example, is an adhesive dressing that has a large skin reaction and is highly irritating to the skin.

1: Medical adhesive dressing

2: Support body

3: Adhesive layer

4:Pad

41: Non-woven fabric layer

42: Scaling network layer

7: Tape

Claims (9)

A medical adhesive dressing for elbow or knee joints, which has a support body, an adhesive layer covering the surface of the support body, and a pad arranged on the adhesive layer, characterized in that the area of the support body is 4,700～13,000mm ² , the area of the pad is 1,500～4,500mm ² , in the overlapping portion of the support, the adhesive layer and the pad, continuous elongation recovery when stretched 20 times under a load of 15N The rate A (forward path) is 90% or more, the continuous elongation recovery rate B (return path) is 70% or more, and the ratio B/A of these elongation recovery rates is 0.5 or more. According to the medical adhesive dressing according to claim 1, the pad includes a laminated structure of a polyester nonwoven layer and a stretchable mesh layer. According to the medical adhesive dressing according to claim 1 or claim 2, the polyester non-woven fabric layer in the dressing pad has a weight of 50 to 150 g/m ² . According to the medical adhesive dressing described in claim 1, the supporting body is a polyurethane film or a polyurethane non-woven fabric. According to the medical adhesive dressing according to claim 1, the area ratio of the support body to the pad is support area: pad area = 3:1 to 2:1. According to the medical adhesive dressing according to claim 5, the area ratio of the support body to the pad is support area: pad area = 3:1 to 2.5:1. The medical adhesive dressing according to claim 1, in the overlapping portion of the support, the adhesive layer and the dressing pad, The 30% tensile load (MD) is 5~50N/25mm, and the 30% tensile load (CD) is 3~50N/25mm. According to the medical adhesive dressing described in claim 1, the support body has a roughly square or roughly quadrilateral shape, and has recesses at the four corners of the roughly square or roughly quadrilateral shape, and the shortest distance between the recess and the pad is 10 to 25 mm. Adhesive dressings for medical use as described in claim 1 or 8, The support body has a substantially square or substantially quadrangular shape, and is provided with a recess on an inner side facing its length direction.