Band-aid

Abstract

To provide an adhesive bandage that is easy to be applied, and is easy to obtain a relaxation effect of the biting of nails to skin.SOLUTION: An adhesive bandage 1 has a base material layer, an adhesive layer and a release material layer. In plan view of the adhesive bandage 1, each of an upper side 11 and a lower side 12 extended in the longitudinal direction has longitudinally-parallel portions 11a, 11b, 12. The upper side 11, which is the one with a longer distance along the longitudinal direction between both ends of the upper side 11 and the lower side 12, has a curved part 11c recessed in the short direction in plan view. Each of angles β, β between the upper side 11 and a left-hand side 13 and a right-hand side 14 is an acute angle. A longitudinal elongation ratio (1 N) of the adhesive bandage 1 at the time when an external force of 1 N is applied in the longitudinal direction to the adhesive bandage 1 with the release material layer being torn off and the adhesive bandage is stretched out is 5-12%. Also, a longitudinal elongation ratio (3 N) of the adhesive bandage 1 at the time when the external force of 3 N is applied in the longitudinal direction to the adhesive bandage 1 with the release material layer being torn off and the adhesive bandage is stretched out is 30-120% or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a band-aid.

Background Art

[0002] One of the inflammations that occur in the skin around the nails of the hands and feet is paronychia. The skin around the nails becomes red or swollen, often accompanied by pain. In order to relieve the pressure on the surrounding tissues such as the nails, prevent the aggravation of the inflammation, and also relieve the pain, a commercially available taping material may be wound around the nails and used (Non-Patent Document 1). However, in the treatment using a commercially available taping material, users such as doctors, nurses, and patients must select a taping material from various types of commercially available products. Also, each time it is used, it is necessary to cut it to an appropriate size. Such countermeasures are complicated. Therefore, especially for outpatients, there is a problem that it is likely to cause the aggravation of paronychia because taping cannot be continued at home or the like.

[0003] In response to this problem, Patent Document 1 proposes a band-aid for relieving the ingrowth of nails into the skin due to paronychia. The band-aid of Patent Document 1 has a base material layer, an adhesive layer, and a release material layer, and adopts a specific shape in plan view. By sticking this band-aid around the skin of the nail while pulling it, tension is applied to the skin after pasting. Therefore, the interval between the nail and the ingrowth of the nail in the skin widens, and an effect of relieving the ingrowth can be obtained.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Non-Patent Documents

[0005]

Non-Patent Document 1

[0006] However, according to the inventor's research, the adhesive bandage described in Patent Document 1 has room for improvement in terms of ease of application and ease of achieving the effect of reducing nail ingrown skin. This invention provides an adhesive bandage that is easy to apply and effectively reduces the ingrown effect of nails on the skin. [Means for solving the problem]

[0007] As a result of diligent research, the inventors of the present invention discovered that by setting the elongation rate in the longitudinal direction of the adhesive bandage within a predetermined range, it is possible to achieve both appropriate elasticity and tension on the skin after application, thus completing the adhesive bandage of the present invention.

[0008] The present invention encompasses embodiments described in [1] to

[12] below. [1] A bandage having a base layer, an adhesive layer and a release layer; each of two peripheries extending in the longitudinal direction in a plan view of the bandage has a portion parallel to the longitudinal direction; the distance along the longitudinal direction between the ends of one of the two peripheries is longer than the distance along the longitudinal direction between the ends of the other periphery; the periphery with the longer distance along the longitudinal direction between its ends has a curved portion that is concave in the short direction perpendicular to the longitudinal direction in a plan view; and two other peripheries connecting the ends of the two peripheries An adhesive bandage in which the angle between each of the two peripheries is acute, and the angle between each of the two peripheries is acute, and the longitudinal elongation (1N) of the adhesive bandage when an external force of 1N is applied to the adhesive bandage in the longitudinal direction and it is stretched is 5-12%, and the longitudinal elongation (3N) of the adhesive bandage when an external force of 3N is applied to the adhesive bandage in the longitudinal direction and it is stretched is 30-120% or less. [2] The bandage of [1], wherein the curved portion is substantially arc-shaped. [3] The bandage of [1] or [2], wherein the parallel portion of the longer of the two peripheries along the longitudinal direction between the two ends is located on both ends in the longitudinal direction; the curved portion includes the longitudinal center of the longer of the two peripheries along the longitudinal direction between the two ends; and each of the parallel portions of the longer of the two peripheries along the longitudinal direction between the two ends is connected to both ends of the curved portion. [4] Any of the bandages [1] to [3] that are symmetrical with respect to a central axis perpendicular to the longitudinal direction. [5] Any of the bandages [1] to [4], wherein the shortest distance between the shorter of the two peripheries along the longitudinal direction between the two ends and the curved portion is 7 to 20 mm. [6] Any of the bandages [1] to [5], wherein the distance along the longitudinal direction between the ends of the longer of the two peripheries is 30 to 80 mm. [7] Any of the bandages from [1] to [6], wherein the maximum distance between the two peripheries in the short direction is 10 to 25 mm. [8] Any of the bandages from [1] to [7], wherein the angle between each of the two other peripheries and the periphery that has a shorter distance along the longitudinal direction between the two ends is 160° or less. [9] Any of the bandages [1] to [8], having a human skin retention time of 20 to 200 seconds as measured by the method described below. Method for measuring human skin retention: A 250g weight is placed on a stand and attached to the longitudinal end of the bandage while it remains on the stand. A portion of the release agent layer of the bandage is peeled off from the end opposite to the end to which the weight is attached, and a 10mm portion of the exposed adhesive layer, along the longitudinal length from the opposite end, is attached to the skin on the inside of the arm. Then, the arm is raised until the weight is lifted off the stand, and the time until the bandage falls off the arm is measured. The elapsed time from time t0 seconds when the weight is lifted off the stand to time t1 seconds when the bandage falls off the skin: t1-t0 seconds is defined as the human skin retention.

[10] The external force (F1) for stretching the adhesive plaster with the release material layer peeled off in the longitudinal direction so that the elongation rate in the longitudinal direction is 7% is 0.55 to 1.4 N, and the adhesive plaster according to any one of [1] to [9].

[11] The external force (F2) for stretching the adhesive plaster with the release material layer peeled off in the longitudinal direction so that the elongation rate in the longitudinal direction is 70% is 2.5 to 8.0 N, and the adhesive plaster according to any one of [1] to

[10] .

[12] The adhesive plaster according to any one of [1] to

[11] , which is an adhesive plaster for preventing and / or treating paronychia.

Advantages of the Invention

[0009] According to the present invention, there is provided an adhesive plaster that is easy to apply and is likely to obtain an effect of alleviating the ingrowth of nails into the skin.

Brief Description of the Drawings

[0010] [Figure 1] A plan view of an example of the adhesive plaster of the present invention. [Figure 2] A cross-sectional view taken along line 1B-1B of the adhesive plaster of FIG. 1. [Figure 3] A schematic view for explaining the usage state of the adhesive plaster of FIG. 1. [Figure 4] A schematic view of FIG. 3 seen from the ventral side of the finger. [Figure 5] A plan view of another example of the adhesive plaster of the present invention. [Figure 6] A plan view of another example of the adhesive plaster of the present invention. [Figure 7] A plan view for explaining the measurement method of elongation rate (1 N) and elongation rate (3 N). [Figure 8] A photograph for explaining the measurement method of elongation rate (1 N) and elongation rate (3 N). [Figure 9] A photograph for explaining the measurement method of elongation rate (1 N) and elongation rate (3 N). [Figure 10] A photograph for explaining the measurement method of human skin holding power. <00​​​

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] In this specification, "prevention and / or treatment" means prevention, treatment, or both prevention and treatment. In this specification, "~" indicating a numerical range means that the numerical values described before and after it are included as the lower limit value and the upper limit value.

[0012] The adhesive plaster of the present invention has a base material layer, an adhesive layer, and a release material layer. The configurations of these layers will be described later. Also, the adhesive plaster of the present invention has the following specific shape (S) in plan view. Shape (S): In plan view of the adhesive plaster, each of the two peripheries extending in the longitudinal direction has a portion parallel to the longitudinal direction; the distance along the longitudinal direction between both ends of one of the two peripheries is longer than the distance along the longitudinal direction between both ends of the other periphery; the periphery with the longer distance along the longitudinal direction between both ends has a curved portion recessed in the short direction perpendicular to the longitudinal direction in plan view; and each of the angles between the periphery with the longer distance along the longitudinal direction between both ends and the other two peripheries connecting both ends of the two peripheries is an acute angle.

[0013] In addition to the specific shape (S), the adhesive plaster of the present invention further has the following constituent requirements (X) and constituent requirements (Y). Constituent requirement (X): The elongation rate (1N) in the longitudinal direction of the adhesive plaster when a 1N external force is applied in the longitudinal direction to the adhesive plaster from which the release material layer has been peeled off and stretched is 5 to 12%. Constituent requirement (Y): The elongation rate (3N) in the longitudinal direction of the adhesive plaster when a 3N external force is applied in the longitudinal direction to the adhesive plaster from which the release material layer has been peeled off and stretched is 30 to 120% or less.

[0014] The release material layer can be peeled off and separated from the adhesive plaster during use of the adhesive plaster. In the present invention, the elongation rate (1N) and the elongation rate (3N) are values measured for the adhesive plaster in a state where the release material layer has been peeled off. Therefore, the elongation rate (1N) and elongation rate (3N) are measured for the bandage after the release agent layer has been separated, i.e., the bandage having a base layer and an adhesive layer. Specifically, the elongation rate (1N) and elongation rate (3N) can be determined using a tensile testing machine by the method described in the examples below.

[0015] In the adhesive bandage of the present invention, as described in constituent element (X) above, the elongation rate (1N) is above the lower limit of a predetermined numerical range, so the bandage stretches appropriately when applied to the skin. Therefore, the bandage can be stretched without requiring excessive force, making it easy to apply. In the adhesive bandage of the present invention, as described in constituent element (X) above, the elongation rate (1N) is below the upper limit of a predetermined numerical range, so the adhesive bandage of the present invention is less likely to stretch excessively, and the elastic force of the adhesive bandage is easily obtained. As a result, the tension on the skin after the adhesive bandage is applied is sufficient, so the adhesive bandage of the present invention easily provides a soothing effect. From these points of view, the elongation rate (1N) is preferably 5-12%, and more preferably 6-11%.

[0016] In the adhesive bandage of the present invention, as described in constituent element (Y) above, the elongation rate (3N) is above the lower limit of a predetermined numerical range, so the bandage stretches appropriately when applied to the skin. Therefore, it can be stretched to apply sufficient tension to the skin, making the adhesive bandage of the present invention easy to apply. In particular, even when the effect of relieving indentation cannot be obtained without pulling with a relatively strong force depending on the degree of indentation, the bandage stretches appropriately, making it easy to apply. In the adhesive bandage of the present invention, as described in constituent element (Y) above, the elongation rate (3N) is below the upper limit of a predetermined numerical range, so the adhesive bandage of the present invention is less likely to stretch excessively, and the elastic force of the adhesive bandage is easily obtained. As a result, the tension on the skin after the adhesive bandage is applied is sufficient, so the adhesive bandage of the present invention easily provides a soothing effect. From these points of view, the elongation rate (3N) is preferably 30-120%, and more preferably 35-110%.

[0017] In the adhesive bandage of the present invention having a specific shape (S), the elongation rate (1N) is within a predetermined range, and the elongation rate (3N) is within a predetermined range. Therefore, the adhesive bandage of the present invention can achieve both appropriate stretchability when applied to the skin and tension applied after application to the skin. As a result, the adhesive bandage of the present invention is easy to apply and effectively reduces nail indentation into the skin.

[0018] In the adhesive bandage of the present invention, the human skin retention time is preferably 20 to 200 seconds, more preferably 25 to 150 seconds, and even more preferably 30 to 100 seconds. If the human skin retention capacity is above the lower limit, the adhesive strength to the skin is high, and the bandage is easier to apply. If the human skin retention capacity is below the upper limit, it is preferable because the bandage is easier to remove when changing it.

[0019] Human skin retention capacity is measured by the following method. First, a 250g weight is placed on a stand and attached to the longitudinal end of the bandage while it remains on the stand. A portion of the release agent layer of the bandage is peeled off from the end opposite the end where the weight is attached, and a 10mm portion of the exposed adhesive layer is attached to the skin on the inside of the arm. Then, the arm is raised until the weight is lifted off the stand, and the time until the bandage falls off the arm is measured. The elapsed time from t0 seconds when the weight is lifted off the stand to t1 seconds when the bandage falls off the skin (t1-t0 seconds) is defined as the human skin retention force. More specifically, the human skin retention capacity can be determined by the method described in the examples below.

[0020] The inventors have found a correlation between the ease of applying an adhesive bandage and its effectiveness in mitigating nail ingrown to the skin. In other words, ease of application of an adhesive bandage may be related to the ability to apply the bandage properly in a way that provides a mitigating effect. Therefore, the inventor focused on the fact that when applying an adhesive bandage to the skin, the longitudinal elongation of the bandage is relatively small. Specifically, the external force (F1) required to stretch the adhesive bandage in the longitudinal direction so that the longitudinal elongation rate of the bandage after the release layer has been removed is 7% may be related to how easy the bandage is to apply to the skin, even within the process of applying the bandage to the skin.

[0021] In the adhesive bandage of the present invention, the external force (F1) is preferably 0.55 to 1.4 N, more preferably 0.6 to 1.3 N, and even more preferably 0.65 to 1.2 N. When the external force (F1) is above the lower limit, a moderate force is required when starting to apply the bandage to the skin. Therefore, it is easier to apply it so that sufficient tension is applied to the skin, and the relief effect is more easily obtained. Also, when the external force (F1) is below the upper limit, excessive force is not required when starting to apply the bandage to the skin. Therefore, the bandage is less likely to peel off due to insufficient adhesive strength in the area of ​​skin where it was first applied. Therefore, when the external force (F1) is within the range of the aforementioned values, it becomes easier to apply the bandage to the skin, as this reduces the likelihood of the nail digging into the skin. The external force (F1) can be determined specifically by the method described in the embodiments below.

[0022] As mentioned above, ease of applying a bandage may be related to being able to apply the bandage appropriately to achieve a soothing effect. Therefore, the inventor focused on the fact that when applying a bandage to the skin while stretching it, the longitudinal elongation of the bandage is relatively large. Specifically, the external force (F2) required to stretch the bandage in the longitudinal direction so that the longitudinal elongation rate of the bandage after the release layer has been removed is 70% may be related to the ease of application when stretching the bandage while applying it to the skin so that tension is applied to the skin during the application process.

[0023] In the adhesive bandage of the present invention, the external force (F2) is preferably 2.5 to 8.0 N, more preferably 3.0 to 7.5 N, and even more preferably 3.0 to 7.0 N. When the external force (F2) is above the lower limit, the adhesive bandage is less likely to stretch excessively, and when applying the bandage to the skin while stretching it, an appropriate amount of force is required. Therefore, it is easier to apply the bandage so that sufficient tension is applied to the skin, and the relief effect is more easily obtained. When the external force (F2) is below the aforementioned upper limit, the bandage stretches appropriately when applied to the skin while being stretched. As a result, the elasticity of the bandage is easily exerted, tension is easily applied to the skin, and the relief effect is further enhanced. Furthermore, even if a strong force is applied that stretches the bandage by 70% in the longitudinal direction, it is less likely to act as a force that pulls the bandage off the skin where it was first applied, making it less likely to peel off. Therefore, when the external force (F2) is within the range of the aforementioned values, it becomes easier to apply the bandage to the skin while stretching it, thus reducing the likelihood of the nail digging into the skin. Furthermore, the elasticity of the bandage is more easily exerted, and the effect of reducing digging in becomes even more pronounced. The external force (F2) can be determined specifically by the method described in the embodiments below.

[0024] An example of the adhesive bandage of the present invention will be described below with reference to the drawings. However, the adhesive bandage of the present invention is not limited to one or more embodiments described below. Furthermore, the dimensional ratios in each drawing are for illustrative purposes only and do not reflect actual dimensions. Also, in the following drawings, identical components are indicated by the same reference numerals, and explanations for redundant components are omitted.

[0025] Figure 1 is a plan view showing an example of the adhesive bandage of the present invention. Figure 2 is a cross-sectional view of the adhesive bandage 1 of Figure 1 along the line 1B-1B. As shown in Figure 1, the bandage 1 has two edges extending in the longitudinal direction in a plan view of the bandage 1, namely an upper edge 11 and a lower edge 12. The bandage 1 also has two other edges connecting the ends of these two edges (upper edge 11 and lower edge 12), namely a left edge 13 and a right edge 14.

[0026] Each of the upper edge 11 and the lower edge 12 has a portion parallel to the longitudinal direction of the adhesive bandage 1. In the adhesive bandage 1, the upper edge 11 has straight sections 11a and 11b that are parallel to the longitudinal direction of the adhesive bandage 1. In the adhesive bandage 1, the lower edge 12 is made up of these parallel sections and is straight. Therefore, the lower edge 12 is parallel to each other to the straight sections 11a and 11b of the upper edge 11.

[0027] The distance L along the longitudinal direction between the ends of the upper edge 11 (one of the two perimeters) is longer than the distance along the longitudinal direction between the ends of the lower edge 12 (the other perimeter). The upper edge 11 (the perimeter with the longer distance along the longitudinal direction between its ends) has straight sections 11a and 11b parallel to the longitudinal direction of the bandage 1; and a curved section 11c that is recessed in the short direction perpendicular to the longitudinal direction of the bandage 1 in a plan view. Here, the length of the upper edge 11 is the sum of the lengths of the straight and curved sections along the straight section 11a, the roughly arc-shaped curved section 11c, and the straight section 11b. In the adhesive bandage 1, the straight portions 11a and 11b, which are parallel to the longitudinal direction of the upper edge 11, are located at both ends of the upper edge 11 in the longitudinal direction, and the curved portion 11c includes the center of the upper edge 11 in the longitudinal direction. Each of the straight portions 11a and 11b of the upper edge 11 is connected to both ends of the curved portion 11c. Thus, both ends of the curved portion 11c are continuously connected to one end of each of the straight portions 11a and 11b.

[0028] The bandage 1 is symmetrical with respect to a central axis Ax perpendicular to its longitudinal direction. In other words, the bandage 1 is symmetrical left to right with respect to its longitudinal central plane. The angles β, β between the top edge 11 and the left and right edges 13 and 14 are acute angles, less than 90°. Angle β is preferably 20° or greater, and more preferably 60-80°. An angle β of 60-80° does not restrict the range of motion of the fingers and makes it easier to pull the skin with appropriate force. The angles α, α between the bottom edge 12 and the left edge 13 and right edge 14 are obtuse angles and greater than 90°. Angles α are preferably 160° or less, and more preferably between 100° and 120°. When angle α is 160° or less, the angles of the left edge 13 and right edge 14 relative to the bottom edge 12 are not too steep, making it easier to apply the adhesive bandage 1 while maintaining tension on the skin. It is also easier to wrap it in a spiral shape. In bandage 1, both ends of the upper edge 11 in the longitudinal direction are parallel to the lower edge 12, so in this case, α + β = 180°.

[0029] The distance L along the longitudinal direction between the ends of the upper side 11, which is the longer of the two ends of the upper side 11 and the lower side 12, is preferably 30 to 80 mm, and more preferably 40 to 70 mm. If the distance L is greater than or equal to the lower limit, the bandage 1 is appropriately long and easy to apply. If the distance L is less than or equal to the upper limit, the bandage 1 is not too long and easy to apply. The distance along the longitudinal direction between the ends of the lower side 12 (the length of the lower side 12 in the case of the bandage 1), whichever of the upper side 11 and lower side 12 has a shorter distance along the longitudinal direction between its ends, is not particularly limited. In the bandage 1, the length of the lower side 12 is preferably 25 to 75 mm, and more preferably 30 to 65 mm. If the length of the lower side 12 is greater than or equal to the lower limit, it is easier to ensure the length of the bandage 1. If the length of the lower side 12 is less than or equal to the upper limit, it is easier to make the angle β an acute angle. The lengths of the straight sections 11a and 11b are not particularly limited. For example, 3 to 32 mm is preferred. The radius of the arc of the curved section 11c is also not particularly limited. For example, 10 to 150 mm is preferred. Furthermore, the lengths of the left side 13 and the right side 14 are not particularly limited. For example, 3 to 40 mm is preferred, and 8 to 30 mm is more preferred. If the lengths of the left side 13 and the right side 14 are greater than or equal to the lower limit, the adhesive bandage 1 is easier to apply to the skin near the affected area. If the lengths of the left side 13 and the right side 14 are less than or equal to the upper limit, it is easier to apply tension to the skin after the adhesive bandage 1 is applied, and the relief effect is more easily obtained.

[0030] The maximum distance W between the upper edge 11 and the lower edge 12 of the bandage 1 in the short direction perpendicular to the longitudinal direction is preferably 10 to 25 mm, and more preferably 11 to 23 mm. If the maximum distance W is greater than or equal to the lower limit, the bandage 1 is easier to apply to the skin near the affected area. If the maximum distance W is less than or equal to the upper limit, it is easier to apply tension to the skin after applying the bandage 1, and the relief effect is more easily obtained.

[0031] The shortest distance d between the lower edge 12 and the curved portion 11c, which is the shorter of the two lower edges 12 along the longitudinal direction between their ends, is preferably 7 to 20 mm, more preferably 7.5 to 18 mm, and even more preferably 8 to 16 mm. When the shortest distance d is greater than or equal to the lower limit, the adhesive bandage 1 is less likely to stretch excessively in the longitudinal direction. Therefore, sufficient tension is easily applied to the skin after application, and the relief effect is more easily obtained. In addition, when the shortest distance d is greater than or equal to the lower limit, the strength of the adhesive bandage 1 is also improved. When the shortest distance d is less than or equal to the upper limit, the adhesive bandage 1 stretches moderately in the longitudinal direction. Therefore, ease of application is further improved. The shortest distance d can also be described as the width of the narrowest point in the direction perpendicular to the longitudinal direction of the bandage 1, due to the indentation of the curved portion 11c.

[0032] The shortest distance d is preferably 30-80% of the maximum distance W. When the shortest distance d is 30-80% of the maximum distance W, the external force applied to the bandage 1 does not decrease significantly at the curved portion 11c of the bandage 1. Therefore, tension can be effectively applied to the skin. As a result, the effect of alleviating nail ingrown toenails is more easily obtained after applying the bandage 1 to the skin.

[0033] When the shortest distance d is 30% or more of the maximum distance W, the bandage 1 does not become too narrow in the short direction at the curved portion 11c. Therefore, when the bandage 1 is pulled, the deformation such as stretching at the curved portion 11c is small, making the bandage 1 less susceptible to deformation under external force. As a result, when applying the bandage 1 to the skin, it is easier to maintain a certain level of tension and to apply it in a way that widens the gap between the nail and the skin.

[0034] When the shortest distance d is 80% or less of the maximum distance W, the curved portion 11c becomes moderately deep and stretches easily. Therefore, even if strong external force is applied to the bandage 1 when attaching it to the skin, the area around the affected area is less likely to deform, making it easier to apply the bandage 1. As a result, the tension applied to the skin around the affected area does not decrease easily, and the effect of reducing nail indentation into the skin after wrapping and applying the bandage 1 to the finger is further enhanced. Furthermore, if the shortest distance d is 80% or less of the maximum distance W, the area of ​​the fingertip covered after wrapping and attaching the bandage 1 to the finger will be smaller, thus reducing the loss of sensation in the finger compared to when the fingertip is exposed. In addition, the ease of movement of the fingertips and joints, that is, the degree of freedom, will not be significantly reduced.

[0035] As shown in Figure 2, the bandage 1 has a base layer 20, an adhesive layer 30, and a release layer 40. The bandage 1 can also be described as a tape in which the release layer 40 is laminated to one side of the base layer 20 via the adhesive layer 30 in a peelable manner. The thickness of the bandage 1, that is, the sum of the thicknesses of the base layer 20, the adhesive layer 30, and the release agent layer 40, is preferably 50 to 1200 μm, and more preferably 100 to 500 μm. If the thickness of the bandage 1 is above the lower limit, the bandage 1 has excellent strength. If the thickness of the bandage 1 is below the upper limit, the bandage 1 is flexible.

[0036] The base layer 20 is elastic. Therefore, when the bandage 1 is stretched, it exerts elastic force as it tries to return to its original length. In addition, it causes less discomfort after being applied to the skin. Furthermore, it conforms easily to the skin and the bandage 1 is less likely to peel off. In terms of preventing dampness caused by the bandage 1 on and around the affected area of ​​paronychia, it is preferable that the base layer 20 has excellent breathability.

[0037] Examples of materials constituting the base material layer 20 include stretchable base materials such as films, nonwoven fabrics, cotton fabrics, knitted fabrics, and laminate composites of nonwoven fabrics and films. Examples of materials for these base materials include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polystyrene, polyamide, polyolefin, nylon, cotton, pulp, acetate rayon, 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, and ethylene-vinyl acetate copolymer.

[0038] The base layer 20 may contain various strength control agents widely used in the art, fillers such as inorganic powders, dyes, pigments, etc. Furthermore, the base layer 20 may be manufactured by uniaxial stretching, biaxial stretching, or unstretched methods. The base layer 20 may also be a single-layer structure or a multilayer structure consisting of multiple layers of different or identical materials.

[0039] The thickness of the base layer 20 is not particularly limited. In terms of elasticity and moisture permeability, the thickness of the base layer 20 is preferably 1000 μm or less, more preferably 500 μm or less, and even more preferably 300 μm or less. In terms of strength, the thickness of the base layer 20 is preferably 15 μm or more, more preferably 20 μm or more, and even more preferably 30 μm or more.

[0040] The adhesive layer 30 can be composed of an adhesive for attaching the base layer 20 to the skin. Examples of adhesives include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, and hydrocolloids. Considering the adhesion and adhesive strength between the substrate layer 20 and the adhesive, and the adhesion and adhesive strength between the skin and the adhesive, isocyanate-based crosslinking agents, metal chelating agents, tackifiers, etc. may be added to the adhesive as appropriate. It is preferable to set a high molecular weight for the adhesive components to suppress the penetration of the adhesive into the skin.

[0041] The thickness of the adhesive layer 30 is not particularly limited. In terms of moisture permeability, the thickness of the adhesive layer 30 is preferably 100 μm or less, and more preferably 70 μm or less. In terms of adhesion to the skin, the thickness of the adhesive layer 30 is preferably 10 μm or more, and more preferably 20 μm or more. The adhesive layer 30 may be formed by applying a foamed adhesive. The coating pattern may be a regular pattern such as dots or stripes, or an irregular (random) pattern.

[0042] Various release agents used in adhesive bandages can be used for the release agent layer 40. Examples of release agents include paper and plastic film. The release agent layer 40 is sometimes also called release paper.

[0043] The release agent layer 40 has two slits 41 and 42 formed therein to facilitate the removal of the release agent layer 40 during use. The release agent layer 40 consists of three parts 43, 44, and 45 separated by two slits 41 and 42 that are parallel to and equidistant from the central axis Ax of the bandage 1. Therefore, the three parts 43, 44, and 45 can be peeled off separately from the position of the slits 41 and 42 at a timing that coincides with the application of the release agent layer 40 to the skin, exposing the adhesive layer 30 separately. In addition, the slits 41 and 42 prevent the adhesive strength from decreasing due to contact with the adhesive layer 30 when applying the bandage 1.

[0044] The method of using the adhesive bandage 1 shown in Figures 1 and 2 will be explained using the example of a case where there is a paronychia lesion 52 on the skin adjacent to the nail 51 of the thumb 50 of the patient's left hand, as shown in Figures 3 and 4. First, peel off portion 43 of the release agent layer 40 of the bandage 1 to expose the corresponding portion of the adhesive layer 30. At this time, it is easier to peel off portion 43 of the release agent layer 40 from the position of the slit 41 (see Figures 1 and 2). Next, the left edge 13 of the bandage 1, with the adhesive layer 30 exposed in portion 43 of the release agent layer 40, is placed on the skin to the side of the affected area 52. Then, the portion along the left edge 13 is pressed firmly against the skin, starting from the acute angle formed by the straight portion 11a of the top edge 11 and the left edge 13 (see Figures 3 and 4). Next, the release agent layer 40 is peeled off to expose the corresponding adhesive layer 30. Then, while pulling the bandage 1 to relieve pressure between the nail 51 and the affected area 52, the bandage 1 is attached to the skin in a spiral (downward diagonal direction) so that the adhesive layer 30 is in contact with the skin. Finally, the release agent layer 40, portion 45, is peeled off and attached to the skin.

[0045] In Figure 3, the bandage 1 terminates on the right side 14 on the dorsal side of the thumb 50, between the first and second joints (above the proximal phalanx). The length of the upper side 11 is longer than the length of the lower side 12, and the angle β is acute. Therefore, compared to cases where the lengths of the upper side 11 and the lower side 12 are the same, or where the length of the upper side 11 is shorter than the length of the lower side 12, it is easier to apply the bandage 1 diagonally downwards, and it is possible to prevent the tape from compressing the skin on the side of the nail 51. Furthermore, for example, if the acute angle (angle β) between the upper edge 11 and the left edge 13 is 60-80°, the right edge 14 will be located on the dorsal side of the thumb 50, between the first and second joints (above the proximal phalanx), which makes it less likely to restrict the range of motion of the finger and allows for pulling the skin on the side of the affected area 52 with appropriate force.

[0046] As shown in Figure 4, when the thumb 50 is viewed from the ventral side, the upper edge 11 of the adhesive bandage 1 has a curved portion 11c. Compared to the case where the upper edge 11 of the adhesive bandage 1 is straight, the exposed area of ​​the pad of the fingertip 53 above the first joint of the thumb 50 is wider. As a result, sensation in the pad of the fingertip, which is used for a lot of work, is less likely to be impaired, and work performance such as work, housework, and operating electronic devices such as smartphones can be maintained well. However, as described above, in order to suppress the decrease in the external force applied to the bandage 1 around the curved portion 11c and to effectively apply tension to the skin, it is preferable that the shortest distance d between the lower edge 12 and the curved portion 11c be 30-80% of the maximum distance W between the upper edge 11 and the lower edge 12 (see Figure 1).

[0047] Since the adhesive bandage 1 is symmetrical with respect to its central axis Ax, if the affected area 52 is to the left of the nail 51, the right edge 14 of the adhesive bandage 1 can be positioned on the skin to the side of the affected area 52, and the adhesive bandage 1 can be applied to the skin in a spiral (diagonally downward) manner to alleviate the pressure between the nail 51 and the affected area 52 (see Figures 3 and 4). Although Figures 3 and 4 show the thumb, the adhesive bandage of the present invention can also be used on at least one of the fingers selected from the group consisting of the index finger, middle finger, ring finger, and little finger of the hand. Furthermore, the adhesive bandage of the present invention can also be used on at least one of the five toes of the foot.

[0048] Next, referring to Figure 5, we will explain another example of a bandage. Bandage 2, shown in Figure 5, differs from Bandage 1 in the following respects. • The four corners 16 of the bandage 1 are rounded in a roughly curved shape. The portion 11e where the straight portion 11a and the curved portion 11c connect is rounded in a substantially curved shape. The portion 11f where the straight portion 11b and the curved portion 11c connect is rounded in a substantially curved shape.

[0049] The radii of curvature of the four corners 16 and the rounded portions 11e and 11f can each be set independently and arbitrarily. For example, the radius of curvature of each curve can be set from 1 to 10 mm. The size of the rounded corners 16 can also be set arbitrarily.

[0050] In the adhesive bandage 2, the top edge 11 is rounded in a roughly curved shape at both ends. The top edge 11 of the adhesive bandage 2 continuously comprises a straight portion 11a, a curved portion 11c, a straight portion 11b, a portion 11e that is rounded in a roughly curved shape between the straight portion 11a and the curved portion 11c, and a portion 11f that is rounded in a roughly curved shape between the straight portion 11b and the curved portion 11c. The rounded portions 11e and 11f are continuous with the curved portion 11c via an inflection point. The bottom edge 12 consists of straight sections 12a, excluding the rounded, roughly curved ends 16, 16. Similarly, the left edge 13 and the right edge 14 each consist of straight sections 13a and 14a, excluding the rounded, roughly curved ends 16, 16.

[0051] In this specification, if the connection between line segments that make up the periphery of a bandage, such as bandage 2, is substantially curved, the distance L along the longitudinal direction between the ends of the upper edge 11 and the distance along the longitudinal direction between the ends of the lower edge 12 shall be the values ​​measured for the shape before the corners are rounded. In other words, in bandage 2, distance L is the distance along the longitudinal direction between intersections C1 and C2 as shown below. Intersection C1: The intersection point of the extension of the line segment along the straight portion 11a and the line segment along the left side 13. Intersection C2: The intersection point of the extension of the line segment along the straight portion 11b and the line segment along the right-hand side 14. Furthermore, in bandage 2, the length of the lower edge 12 is the distance along the longitudinal direction between the intersections C3 and C4 described below. Intersection C3: The intersection of the extensions of the line segment along the lower side 12 and the line segment along the left side 13. Intersection C4: The intersection of the extensions of the line segment along the lower side 12 and the line segment along the right side 14.

[0052] In adhesive bandage 2, the details of the straight portions 11a, 11b, 12a, 13a, and 14a before the corners are rounded can be the same as the details of the straight portions 11a, 11b, 12, 13, and 14 of adhesive bandage 1 shown in Figure 1. For example, in adhesive bandage 2, the length of the straight portion 11a is not particularly limited, but the length of the straight portion before rounding the corners can be 3 to 32 mm. Similarly, the length of the straight portion 12a is not particularly limited, but the length of the straight portion before rounding the corners can be 3 to 32 mm. The lengths of the straight portions 13a and 14a are not particularly limited, but the length of the straight portions before rounding the corners can be 3 to 40 mm.

[0053] For example, in adhesive bandage 2, L can be set to 50 mm, 11a and 11b to 10 mm, W to 15 mm, and d to 10 mm, with the radius of the arc of the curved portion 11c being 25 mm and the central angle of the arc of the curved portion 11c being 74°. When the corners are rounded, the adhesion and fit of adhesive bandage 1 to the skin are improved, and adhesive bandage 1 becomes less likely to peel off the skin. With this configuration as well, adhesive bandage 1 can be applied to alleviate pressure around the nail 51, similar to adhesive bandage 1.

[0054] Next, with reference to Figure 6, we will describe another example of a bandage. The bandage 3 shown in Figure 6 differs from bandage 1 in the following respects. Instead of the slits 41 and 42 in Figure 1, the release agent layer 40 has a slit 46 in the center of the curved portion 11c of the upper edge 11 (i.e., on the central axis perpendicular to the longitudinal direction of the adhesive bandage 1). The release agent layer 40 consists of two parts 47 and 48 separated by the slit 46.

[0055] In the adhesive bandage 3, the release agent layer 40 can be peeled off from portion 47 at the position of the slit 46, and can also be peeled off from portion 48. Therefore, the adhesive bandage can be applied regardless of whether the affected area is on the left or right side of the nail.

[0056] As described in the embodiments above with respect to the treatment of paronychia, the adhesive bandage of the present invention can be used as an adhesive bandage for the prevention and / or treatment of paronychia. In particular, the adhesive bandage of the present invention can be used as an adhesive bandage for the prevention of worsening of inflammation around the nail and / or for pain relief. Furthermore, the adhesive bandage of the present invention may be used for purposes other than paronychia, such as preventing or treating symptoms around the nail, including ingrown toenails, and may also be used in other taping treatments where strong tension is required near the adhesive area at the edges. Furthermore, the adhesive bandage of the present invention may be used not only for treating inflammation, but also for the purpose of keeping the skin away from the nail. For example, it may be used when applying medication near the nail groove.

[0057] Although several embodiments have been described above, the present invention is not limited to the embodiments disclosed herein and can be implemented with appropriate modifications without altering the spirit of the invention. The embodiments disclosed herein can be implemented in various other forms, and various modifications are possible without departing from the spirit of the invention.

[0058] For example, the following transformations are possible. The shape of the curved section in plan view is not limited to a roughly circular arc. The curved section may be formed in various other curved shapes such as a parabola or hyperbola. The adhesive bandage of the present invention may further have other layers besides the base layer, adhesive layer, and release layer. The other layer may be on top of the base layer, between the base layer and the adhesive layer, or between the adhesive layer and the release layer. The other layer may be one layer or two or more layers. If the adhesive bandage has an elastic other layer, the elongation rate (1N) and elongation rate (3N) are measured for the adhesive bandage after the release layer has been separated, i.e., the adhesive bandage having the base layer, adhesive layer, and other layer. If the adhesive bandage has an imelk other layer, it is desirable, if possible, to measure the elongation rate (1N) and elongation rate (3N) for the adhesive bandage after the other layer has also been separated, i.e., the adhesive bandage having the base layer and adhesive layer. In Figures 1 and 2, the base layer 20, adhesive layer 30, and release layer 40 are shown as being the same size, but the release layer may be larger than the base layer and adhesive layer. In particular, if the release layer extends beyond the left and right edges of the base layer, it is easier to peel the release layer from the adhesive layer. Also, the release layer is less likely to get in the way when applying the material. When forming slits in the release agent layer, the slits do not have to be completely separated. For example, the slits may be formed as dotted lines, or one or more slits may be left undivided. The portions 43, 44, 45 (Figure 1, etc.) of the three release agent layers or the portions 47, 48 (Figure 6) of the two release agent layers may be laminated onto the adhesive layer such that their ends overlap each other. The release agent layer may have slits similar to slits 41, 42 (Figure 1, etc.) or slit 46 (Figure 6), or these slits may be omitted. In the adhesive bandage 2 shown in Figure 5, the configuration of the rounded corner 16, the corner formed by the straight portion 11a and the curved portion 11c, and the corner formed by the straight portion 11b and the curved portion 11c may be applied to any adhesive bandage that falls within the scope of the present invention. Furthermore, not all six corners are rounded, not all four corners 16 are rounded, and one, two, or three corners 16 are rounded. However, these are just examples, and various other modifications are possible. [Examples]

[0059] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the descriptions in these examples.

[0060] 1. Test Example 1 (1.1) Manufacturing of adhesive bandages of Examples 1-4 and Comparative Examples 1-4 Eight types of adhesive tape materials 1 to 8, each with an adhesive layer and a release agent layer, were prepared as shown below. Adhesive tape material 1: "Powernet P47842 (MD: winding direction)" manufactured by Hattori Takeshi Co., Ltd., thickness 0.55 mm, base material: polyurethane / nylon, adhesive: acrylic (coated by Shin Tack Kasei). Adhesive tape material 2: "Powernet P47842 (CD: perpendicular to the winding direction)" manufactured by Hattori Takeshi Co., Ltd., thickness 0.55 mm, base material: polyurethane / nylon, adhesive: acrylic (coated with Shin Tack Kasei). Adhesive tape material 3: "Powernet P45645" manufactured by Hattori Takeshi Co., Ltd., thickness 0.45 mm, base material: polyurethane / nylon, adhesive: acrylic (coated by Shin Tack Kasei). Adhesive tape material 4: "Sofpore" manufactured by Nichiban Co., Ltd., thickness 0.35 mm, base material: polyurethane nonwoven fabric, adhesive: acrylic. Adhesive tape material 5: 3M "9907T", thickness 0.25 mm, base material: polyurethane nonwoven fabric, adhesive: acrylic. Adhesive tape material 6: Manufactured by Shin-Tack Kasei Co., Ltd., thickness 0.28 mm, base material: polyurethane nonwoven fabric, adhesive: acrylic. Adhesive tape material 7: "Banroll #479" manufactured by Sekisui Material Solutions Co., Ltd., thickness 0.4 mm, base material: polyurethane nonwoven fabric, adhesive: acrylic. Adhesive tape material 8: Manufactured by KB Seiren Co., Ltd., thickness 0.4 mm, base material: polyurethane nonwoven fabric, adhesive: acrylic.

[0061] As shown in Table 1, adhesive tape material was used, and the bandages were punched out in the shape of bandage 1 shown in Figure 1, with the following dimensions. Here, only in Comparative Example 1, which used adhesive tape material 1, the bandage was punched out so that its longitudinal direction was the winding direction (MD) of the base material. In all other examples, the bandage was punched out so that its longitudinal direction was perpendicular (CD) to the winding direction (MD) of the base material. Next, two slits parallel to the central axis Ax of the adhesive bandage were formed in the release agent layer: 15 mm from the central axis Ax in Examples 1-4 and Comparative Examples 1-3, and 20 mm from the central axis Ax in Example 5, located in the longitudinal direction of the adhesive bandage. The adhesive bandages of Examples 1-4 and Comparative Examples 1-3 were then manufactured. Dimensions of the bandages in Examples 1-4 and Comparative Examples 1-3: L=50mm, W=15mm, d=10mm, 11a=11b=10mm, 12=40mm, radius of the arc of the curved part 11c r=25.8mm, central angle of the arc of the curved part 11c=68.0°, β=71.6°.

[0062] (1.2) Manufacturing of the adhesive bandage of Example 5 The bandage of Example 5 was manufactured in the same manner as in Example 3, except that L=60mm, 12=50mm, the radius of the arc of the curved portion 11c was r=42.5mm, and the central angle of the arc of the curved portion 11c was 52.8°. Specifically, without changing the lengths of parts 11a and 11b, the arc of the curved portion 11c was shortened by 10mm to 50mm.

[0063] (1.3) Measurement of elongation rate (1N) and elongation rate (3N) The elongation rates (1N) and (3N) of the adhesive bandages in Examples 1-4 and Comparative Examples 1-3 were measured as follows. As shown in Figure 7, the straight sections 11a and 11b at both ends of each example of the bandage were clamped with the grips of a tensile testing machine (manufactured by A&D Company, Limited, product name "Tensilon"). In Figure 7, the area G enclosed by the dotted line corresponds to the position where the bandage was clamped by the grips of the tensile testing machine. Figure 8 shows the bandage before being clamped by the grips of the tensile testing machine, and Figure 9 shows the bandage after being clamped by the grips of the tensile testing machine. Next, the bandage was stretched longitudinally under conditions of a chuck distance of 30 mm and a tensile speed of 30 mm / min, and the elongation rate (1N) and elongation rate (3N) were measured. Specifically, the elongation rate (1N) and elongation rate (3N) were calculated using the following formulas. The calculation was performed five times for each sample, and the average of the five calculations was taken as the elongation rate (1N) and elongation rate (3N).

[0064] Elongation rate (1N) = ((L 1N -L0) / L0)×100...Equation (1) Growth rate (3N) = ((L 3N -L0) / L0)×100...Equation (2) In equation (1) or equation (2), L0 is the distance between the chucks (30 mm) after the bandage is gripped by the gripper and before it is stretched in the longitudinal direction, L 1N L is the distance between chucks when the tensile testing machine reads 1N. 3N This is the distance between the chucks when the tensile testing machine reads 3N.

[0065] For the bandage of Example 5, the elongation rate (1N) and elongation rate (3N) were measured in the same manner as in Examples 1-4 and Comparative Examples 1-3, except that the distance between the zippers was set to 40 mm.

[0066] (1.4) Measurement of external force (F1) and external force (F2) For the adhesive bandages of Examples 1-4 and Comparative Examples 1-3, the external force (F1) and external force (F2) were measured as follows. In the same manner as the measurements of elongation (1N) and elongation (3N), the straight sections 11a and 11b at both ends of each example of the adhesive bandage were clamped with the grips of a tensile testing machine (manufactured by A&D Company, Limited, product name "Tensilon"), and the adhesive bandage was stretched longitudinally under conditions of a chuck distance of 30 mm and a tensile speed of 30 mm / min. The reading on the tensile testing machine when the distance between the chucks was 32.1 mm (elongation rate 7%) was defined as the external force (F1), and the reading on the tensile testing machine when the distance between the chucks was 51 mm (elongation rate 70%) was defined as the external force (F2).

[0067] For the adhesive bandage in Example 5, the external force (F1) and external force (F2) were measured as follows. In the same manner as the measurements of elongation (1N) and elongation (3N), the straight sections 11a and 11b at both ends of each example of the adhesive bandage were clamped with the grips of a tensile testing machine (manufactured by A&D Company, Limited, product name "Tensilon"), and the adhesive bandage was stretched longitudinally under conditions of a chuck distance of 40 mm and a tensile speed of 30 mm / min. The reading on the tensile testing machine when the distance between the chucks was 42.8 mm (elongation rate 7%) was defined as the external force (F1), and the reading on the tensile testing machine when the distance between the chucks was 68 mm (elongation rate 70%) was defined as the external force (F2).

[0068] (1.5) Performance evaluation Twelve test subjects with ingrown toenails on their big toes applied each type of adhesive bandage to their big toes in an attempt to alleviate their ingrown toenails. They then evaluated the elasticity, ease of application, and effectiveness of the bandages on a scaled basis. Table 1 shows the evaluation result with the highest number of respondents among the 12 subjects. In cases where there were multiple evaluation results with the highest number of respondents, the worst evaluation result was selected and shown in Table 1.

[0069] (ease of stretching) 5: It stretches too much. 4: It stretches a little too much. 3: It stretches moderately, but not excessively. 2: It's not very stretchy. 1: It doesn't stretch easily. In terms of ease of growth, a rating of "3" indicates the best performance.

[0070] (Ease of application) 4: Very easy to apply. 3: Easy to apply. 2: Difficult to apply. 1: It's very difficult to apply.

[0071] (Ease of obtaining mitigation effects) 3: Sufficient tension can be applied to the skin. 2: It is difficult to apply sufficient tension to the skin. 1: It is not possible to apply sufficient tension to the skin.

[0072] 2. Test Example 2 (2.1) Manufacturing of adhesive bandages in Examples 1-4 and Comparative Examples 1-4 Adhesive bandages for Examples 1-4 and Comparative Examples 1-4 were manufactured in the same manner as in Test Example 1.

[0073] (2.2) Measurement of human skin retention capacity The human skin retention capacity of the adhesive bandages in Examples 1-4 and Comparative Examples 1-3 was measured as follows. One end of a string was tied to a weight placed on a stand, and the other end of the string was attached to the right-hand side 14 of each example of the adhesive bandage via a fixed clip. The total weight of the clip, string, and weight was set to 250g ± 5g. The length of the string between the knot of the weight and the top of the clip was set to 165mm ± 10mm. Before applying the weighted bandage to the skin, the skin on the inside of the forearm was washed with water, wiped with a cloth, and allowed to air dry for at least 5 minutes. Next, the release agent layer was peeled off 10 mm from the right side 14 where the weight was attached and the left side 13 on the opposite side, exposing a portion of the adhesive layer. The exposed portion of the adhesive layer was applied to the skin on the inside of the arm, and then the arm was raised until the weight lifted off the base, and the time until the bandage fell off the arm was measured. The elapsed time from the time t0 seconds when the weight lifted off the base to the time t1 seconds when the bandage fell off the skin (t1-t0 seconds) was defined as the human skin retention force. Figure 12 shows the state before the measurement of human skin retention capacity began, and Figure 13 shows the state during the measurement of human skin retention capacity. The measurement was performed on 5 people, with each person taking 3 measurements, and the average value of all measurements was used as the human skin retention capacity.

[0074] (2.3) Evaluation of human skin retention capacity Five testers evaluated the subjects using a five-point scale from 1 to 5, as shown below. Table 1 shows the evaluation result with the highest number of respondents. If there were multiple evaluation results with the highest number of respondents, the worst evaluation result among them was selected and shown in Table 1. 3: The adhesive strength is slightly too strong, and adhesive residue remains on the skin. 2: The adhesive strength is appropriate. 1: The adhesive strength is weak. In evaluating the ability to retain human skin, a score of "2" indicates the best performance.

[0075] 3.Results The results of test examples 1 and 2 are shown in Table 1.

[0076] [Table 1]

[0077] The adhesive bandages in Examples 1-5 were moderately stretchable and easy to apply to the skin while maintaining sufficient tension. The adhesive bandage in Comparative Example 1 was not very stretchable, and although it could be attached to the skin, it did not exhibit sufficient elasticity and could not apply adequate tension to the skin. The adhesive bandage in Comparative Example 2 was somewhat difficult to stretch, and although it could be attached to the skin, it did not exhibit sufficient elasticity, making it difficult to apply adequate tension to the skin. The adhesive bandage in Comparative Example 3 was too stretchy, making it difficult to apply it to the skin with sufficient tension. The adhesive bandage in Comparative Example 4 was too stretchy, making it extremely difficult to apply it to the skin with sufficient tension. [Industrial applicability]

[0078] According to the present invention, an adhesive bandage is provided that is easy to apply and effectively reduces nail ingrown to the skin. [Explanation of symbols]

[0079] 1...Band-aid, 11...Top edge (the edge with the longer distance along the longitudinal direction between the two ends of the two perimeters extending in the longitudinal direction), 11a, 11b...Straight section (the section parallel to the longitudinal direction), 11c...Curved section, 12...Bottom edge (the edge with the shorter distance along the longitudinal direction between the two ends of the two perimeters extending in the longitudinal direction), 13...Left edge (two other perimeters), 14...Right edge (two other perimeters), d...Shortest distance between the bottom edge and the curved section, W...Maximum distance between the top edge and bottom edge in the short direction of the band-aid, Ax...Central axis perpendicular to the longitudinal direction, L...Length along the longitudinal direction between the ends of the top edge (the edge with the longer distance along the longitudinal direction between the two ends of the two perimeters extending in the longitudinal direction), α...Angle between the bottom edge and the left and right edges, β...Angle between the top edge and the left and right edges.

Claims

1. A bandage having a base layer, an adhesive layer, and a release layer, The aforementioned substrate layer contains polyurethane, The total thickness of the base layer and the adhesive layer is 0.25 to 0.45 mm. In a plan view of the aforementioned adhesive bandage, each of the two peripheries extending in the longitudinal direction has a portion parallel to the longitudinal direction. The distance along the longitudinal direction between the ends of one of the two peripheries is longer than the distance along the longitudinal direction between the ends of the other periphery. The longer of the two peripheries, the one with the longer distance along the longitudinal direction between its two ends, has a curved portion that is concave in the short direction perpendicular to the longitudinal direction when viewed in plan. The angles between the two other peripheries connecting the ends of the two aforementioned peripheries and the periphery that has a longer distance along the longitudinal direction between the ends of the two aforementioned peripheries are acute angles. The shortest distance d between the two peripheries is 30-80% of the maximum distance W between the two peripheries. An adhesive bandage from which the release agent layer has been removed. When an external force of 1 N is applied to the adhesive bandage in the longitudinal direction and it is stretched, the longitudinal elongation rate (1 N) of the adhesive bandage is 5 to 12%, and when an external force of 3 N is applied to the adhesive bandage in the longitudinal direction and it is stretched, the longitudinal elongation rate (3 N) of the adhesive bandage is 30 to 120% or less.

2. The adhesive bandage according to claim 1, wherein the curved portion is substantially arc-shaped.

3. The parallel portion of the perimeter that has a longer distance along the longitudinal direction between the two ends of the aforementioned perimeter is located on both ends in the longitudinal direction. The curved portion includes the center in the longitudinal direction of the longer of the two peripheries, which is the periphery that has a longer distance along the longitudinal direction between the two ends. The adhesive bandage according to claim 1 or 2, wherein each of the parallel portions of the perimeter that has a longer distance along the longitudinal direction between the two ends of the perimeter is connected to both ends of the curved portion.

4. The adhesive bandage according to any one of claims 1 to 3, wherein the shape is symmetrical with respect to a central axis perpendicular to the longitudinal direction.

5. The adhesive bandage according to any one of claims 1 to 4, wherein the shortest distance between the shorter of the two peripheries along the longitudinal direction between its two ends and the curved portion is 7 to 20 mm.

6. The adhesive bandage according to any one of claims 1 to 5, wherein the distance along the longitudinal direction between the ends of the longer of the two peripheries is 30 to 80 mm.

7. The adhesive bandage according to any one of claims 1 to 6, wherein the maximum distance between the two peripheries in the shorter direction is 10 to 25 mm.

8. The adhesive bandage according to any one of claims 1 to 7, wherein the angle between the two other peripheries and the periphery that has a shorter distance along the longitudinal direction between the two ends is 160° or less.

9. The adhesive bandage according to any one of claims 1 to 8, wherein the human skin retention time, as measured by the method described below, is 20 to 200 seconds. Method for measuring human skin adhesion: A 250g weight is placed on a stand and attached to the longitudinal end of the bandage while it remains on the stand. A portion of the release agent layer of the bandage is peeled off from the end opposite to the end to which the weight is attached, and a 10mm portion of the exposed adhesive layer, along the longitudinal length from the opposite end, is attached to the skin on the inside of the arm. Next, the arm is raised until the weight leaves the platform, and the time until the bandage falls off the arm is measured. The elapsed time from t0 seconds, when the weight leaves the platform, to t1 seconds, when the bandage falls off the skin, t1 - t0 seconds, is defined as the skin-holding capacity.

10. The adhesive bandage according to any one of claims 1 to 9, wherein the external force (F1) applied to stretch the adhesive bandage in the longitudinal direction such that the longitudinal elongation of the adhesive bandage after the release agent layer has been removed is 0.55 to 1.4 N.

11. The adhesive bandage according to any one of claims 1 to 10, wherein the external force (F2) applied to stretch the adhesive bandage in the longitudinal direction such that the longitudinal elongation of the adhesive bandage after the release agent layer has been removed is 2.5 to 8.0 N.

12. An adhesive bandage for the prevention and / or treatment of paronychia, according to any one of claims 1 to 11.

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