Wound dressing.

Description: TECHNICAL FIELD [Detailed description of the invention]

[Industrial application field] The present invention relates to a wound bandage, in particular a vapor permeable plastic film bandage having an improved release liner to facilitate the bandage on the wound.

[Previous technology] Scratch bandages made of vapor-permeable plastic films with an adhesive on the back are available in various sizes and shapes. Typical of these are those containing a backsheet (eg, an acrylic adhesive) coated with an ultra-thin vapor permeable plastic film or medical adhesive. In some bandages, the adhesive is formed to surround a central window that contains or does not contain an absorbent pad (usually gauze is used) that covers the wound. The adhesive is usually coated with two relatively hard release liners, each of which covers half of the bandage. This release liner supports the film, protects the sticky part of the bandage, and maintains sterilizing and disinfecting properties. In the use of bandages, the release liner is removed from the adhesive and then the bandage is applied to the wound. An example of this type of bandage is the BLISTER FILM from the Sherwood Medical Company.^TMAnd VIASORB^RIs on sale.

[Problems to be solved by the invention] The problem with the above-mentioned type of bandage that peels off the release liner is that the ultra-thin vapor-permeable plastic film tends to wrinkle and cannot be evenly applied to the patient's skin. Furthermore, especially in the case of relatively large bandages, if the surface of the adhesive material suddenly folds or sticks together, it is difficult or impossible to apply the bandage to the affected area in a flat state. It becomes. Also, if it becomes severely wrinkled, it may have to be disposed of. An object of the present invention is to provide an improved bandage having an adhesive material on the back surface, which substantially reduces the possibility of wrinkling and unexpected adhesion between adhesive materials. A further object of the present invention is to provide an improved bandage of a type that facilitates the placement of a bandage on a wound.

[Means and actions to solve problems] According to the present invention, the bandage of the present invention has a steam permeable plastic support film in which one side excluding the scratch contact portion, for example, the central portion of the bandage is coated with an adhesive material, and a release liner can be peeled off from the adhesive coating. As described above, the release liner means for coating and holding the adhesive coating and the release liner for abruptly changing the release resistance of the release liner to the adhesive coating plastic film so as to be adjacent to the outside of the scratch contact portion. It is composed of the peeling resistance changing means, which is arranged in the above, and when the user feels the change in the peeling resistance, the scratch contact portion and a part of the adhesive coating are exposed. .. The bandage is then applied to the patient's wound with the release liner means partially peeled off, i.e., with the wound contact and part of the adhesive coating exposed. This reduces the possibility that the plastic films will wrinkle or that the plastic films will stick to each other.

[Example] The present invention is basically applicable to various bandage structures, and in particular, is applicable to bandages with or without a scratch patch or gauze in the center thereof. The present invention, together with FIGS. 1 to 7, will be described in the context of a Sherwood Medical blister film (BLISTER FILM) bandage without scratch patches or gauze. With reference to FIGS. 1 and 2, the bandage according to the invention consists of a vapor permeable plastic film or support sheet 10 (for example, made of polyurethane), the majority of its surface being an adhesive material (adhesive coating). ) 12 is covered. As the adhesive material 1, a medical acrylic adhesive material may be used. However, the central portion of the support sheet 10 is not covered with the adhesive material, and a non-adhesive window (scratch contact portion) 14 to be in contact with the wound to which the bandage is applied is formed. In this type of bandage, the window is surrounded on all sides by an adhesive material. As mentioned above, the size of the bandage is substantially variable. To give an example of a common bandage, 1.27X10^-3From 5.08X10^-3A square polyurethane film consisting of 18 cm x 18 cm with a thickness in the range of cm (0.0005 to 0.002 inch). The scratch contact window is located in the center of the bandage and measures 10 cm x 10 cm. The pair of release liners (release liner means) 16 and 18 are in contact with the adhesive material 12, and although not shown, a single liner can be applied as is known. The release lines 16 and 18 prevent the film 10 from being wrapped or wrinkled, and promote tension so that the film can be applied evenly. The liner also prevents the adhesive from accidentally sticking to other parts and keeps the wound contact area of the bandage sterilized. Liners 16 and 18 contain knobs 16'and 18' that are grabbed to remove the liner from the bandage when using the bandage. In reality, the knobs 16'and 18'are coplanar with the bandage before use. For example, release liners 16 and 18 may be made of kraft paper coated with 60-90 lbs of silicone. The present invention provides a convenient means for the user to notice when the release liner is peeled to the opposite side of the window 14. In this case, before the bandage is brought into contact with the wound 26, at the opposing ends 14a, 14b, the adhesive on the side adjacent to those ends and the entire circumference of the window are exposed (No. 1). 3 figure). According to the embodiments of the present application, such means are elongated, relatively hard plastic strips (peeling resistance) that adhere to the non-adhesive surface of film 10 (upper surface in FIG. 2) by adhesive strips 24, 25. Means of change) It consists of 22 and 23. In this embodiment, the slips 22 and 23 are made of Mylar and the adhesive strips 24 and 25 are made of a medical acrylic adhesive. Mylar strips 22 and 23 have the function of increasing the resistance of the release liner to peeling. For example, when the release liner is peeled to the opposite ends 14a, 14b of the window 14, as shown in FIG. 3, it resists the force required to peel the release liners 16 and 18 from the bandage. Is. The force required to peel the release liners 16 and 18 from this bandage depends on the adhesive force between the adhesive material 12 and the release liners 16 and 18, as well as the characteristics of the support sheet 10. The plastic strips 22 and 23 increase the hardness of the support sheet 10 at the portion where the strips 22 and 23 are provided. As a result, when the peeling liners 16 and 18 are peeled to the opposite ends 14a and 14b of the window 14, the peeling angle (as indicated by reference numeral 13 in FIG. 3) is reduced (for example, from 90 degrees to 30). Every time). That is, this means that the vertical force for the release liner to be peeled from the adhesive material is reduced, and a larger peeling force is required to peel off the release liner. In this case, the user can detect that the liner's resistance to peeling has changed abruptly. The maple lips 22 and 23 are slightly separated from the opposing ends 14a and 14b of the window 14 (outside the opposing ends 14a and 14b of the window 14) and strip 22 as shown in FIGS. , 23 and the edges 14a, 14b are preferably formed with a narrow adhesive strip. In this arrangement of strips 22 and 23, all of the windows 14 are exposed and the opposing adhesives sticking to the release liners 16 and 18 (ie, the adhesive in the portion of the windows 14 adjacent to the opposite ends). ), A force somewhat greater than the force required to peel off the release liner is required. That is, when the peeling liner is peeled to a certain point of the strips 22 and 23, a force more than the force required for the peeling is required. It can be seen that the adhesive material is exposed. The strips 22 and 23 are provided over the entire width of the bandage, as shown in FIG. The width and thickness of the strips affect their hardness, but their size can vary within a range. In general, the width of strips 22 and 23 depends on the size of the bandage, and a range of 0.16 to 1.91 cm (1/16 to 3/4 inch) is appropriate. Also, this thickness depends on the hardness of the material used. 2.45X10 for Maya Strip^-3A cm width was used, but preferably 2.45X10^-2cm or less is appropriate. To use the bandages shown in FIGS. 1 and 2, the user first pinches the knobs 16'and 18'and begins to peel off the release liner from the adhesive support sheet 10. When the release liner is peeled up to the near strips 22 and 23 provided near the opposite ends of the window 14 (Fig. 3), the user winds the release liner by substantially increasing the resistance. It can be recognized that 14 has peeled off enough to be exposed. At this time, the user peels off the knobs 16'and 18'and arranges the bandage so as to cover the wound 26 so that the circumference of the window is adhered to the skin. Since the mayer strips 22 and 23 position the opposite end of the window 14 and the adhesive strip adjacent thereto, the bandage is scratched without unnecessarily exposing the adhesive material around the window. It becomes easy to bring them into contact with each other so as to cover them. When the bandage is brought into contact with the wound, it is fixed so as to hold the bandage in a desired position by pressing the adhesive material on the opposite side of the window 14 and the upper and lower surfaces of the window 14. After that, the remaining release liners 16 and 18 are separated from the adhesive material. At this time, since the inner side of the bandage adjacent to the window is flat, the possibility that the bandage is wrinkled is reduced. The bandage is precisely placed and adheres to the affected area, thus reducing the possibility of wrinkling or curling of the adhesive support sheet 10 when the remaining release liner is detached from the adhesive. In the examples shown in FIGS. 1 and 2, it is recognized that the peeling liner is peeled until the window 14 is exposed because a force more than the force required for peeling the peeling liner is required. Is something that can be done. On the contrary, there are some that can recognize that the release liner has been peeled off until the window 14 is exposed by reducing the force required to peel off the release liner. The structure of such a bandage is shown in Figure 4. In this embodiment, the release liners 16 and 18 contain Z-shaped folds 30 and 32 provided at opposite ends 14a and 14b of the window 14, respectively. In the use of bandages, when the peeling liners 16 and 18 are peeled off, the resistance to peeling of the liner suddenly decreases at the Z-shaped folds. It is recognized by the user that this reduction in resistance exposes the adhesive in and around the window. There, the bandage is ready to be adhered and the remaining liner is stripped. In the embodiment shown in FIG. 4, when the liner is peeled to the end adjacent to the window in contact with the scratch, the force required to peel the peel liner from the adhesive 12 is actually reduced. This is what the user feels because the Z-shaped folds 30 and 32 open without resistance. The force required to peel the release liner from the adhesive is actually the same. The force required to peel the release liner from the pressure-sensitive adhesive 12, or the change in resistance to peeling, includes a change in sensation as well as a substantial change, as shown in the following examples. Figures 5, 6 and 7 show three examples of the type in which the peeling resistance increases, as the user recognizes. In FIG. 5, plastic strips 22 and 23 are provided between the adhesive material 12 and the release liners 16 and 18, and the adhesive strips 24 and 25 for adhering the plastic strips 22 and 23 and the release liners 16 and 18 respectively are also provided. It is provided. When the release liners 16 and 18 are peeled up to the plastic strips 22 and 23, the peeling resistance increases due to the adhesion between the strips 22 and 23 and the adhesive material 12. In this example, after placing the bandage on the wound, the strips 22, 23 are stripped from the bandage with the release liners 16, 18, so the adhesive strips 24, 25 are the plastic strips 22, 23 and the adhesive. It is necessary to adhere to the release liners 16 and 18 more than the adhesive bond between 12. The embodiment shown in FIG. 6 is similar to the embodiment shown in FIG. 5, but further silicon strips 34 and 35 are provided between the plastic strips 22 and 23 and the adhesive material 12, respectively. It is a thing. The peel strips 34, 35 ensure that the plastic strips 24, 25 are stripped from the bandage with the strip liners 16, 18, and to remind the user that the strip resistance has increased. The release strips 34 and 35 are sufficiently adhered to the adhesive material 12. FIG. 7 shows an example in which sound wave welding portions 38 are formed at four locations to increase peeling resistance. As is well known, by applying ultrasonic waves to the adhesive layer, the viscosity of the portion is increased. As described above, in FIG. 7, when the liner is peeled to the sound wave welded portion 38, the peeling resistance increases. Instead of the four sonic welds, strips may be formed near the opposite ends 14a, 14b of the window 14.

[Simple explanation of drawings]

FIG. 1 is a schematic plan view of a bandage according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; FIG. FIG. 4 is a cross-sectional view similar to FIG. 2 showing a state before the liner is peeled off and brought into contact with a scratch; FIG. 4 is a schematic cross-sectional view of a bandage according to a second embodiment of the present invention; FIG. 5 is a schematic cross-sectional view of the bandage according to the third embodiment of the present invention; FIG. 6 is a schematic cross-sectional view of the bandage according to the fourth embodiment of the present invention; FIG. 7 is a schematic cross-sectional view of the bandage according to the fourth embodiment of the present invention. It is the schematic sectional drawing of the bandage by 5th Example. 10 ... Plastic film, 12 ... Adhesive (adhesive coating), 14 ... Wind (scratch contact), 16, 18 ... Peeling liner (peeling liner means), 22, 23 ... Plastic strip (peeling resistance changing means), 24, 25 ... Adhesive strip (peeling resistance changing means), 30, 32 ... Z-shaped folds (peeling resistance changing means), 34, 35 ... Silicon peeling strip (peeling resistance changing means) Peeling resistance changing means), 38 ... Sonic welding part (peeling resistance changing means).