Medical dressing material

Abstract

To provide a medical dressing material capable of preventing an incident such as extraction of a needle hub of a catheter during replacement.SOLUTION: A medical dressing material comprises a dressing body 8 that has a skin-side backside and a front side opposite to the backside, and a release sheet (release paper 7) that is peelably stuck on the backside. The backside has an adhesive part and a non-adhesive part. The vertical length and width of the non-adhesive part are 40 mm or more. The adhesive part is formed to surround the non-adhesive part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a medical dressing material that fixes a catheter and covers and protects the puncture site when administering an intravenous drip or the like. [Background technology]

[0002] Conventionally, the puncture site where a catheter is inserted for intravenous drip or the like needs to be firmly fixed in place while piercing the skin. Therefore, a medical dressing is applied over the puncture site to fix the needle hub or tube of the catheter that remains inserted, and to protect the puncture site hygienically and prevent infection.

[0003] Such a medical dressing is disclosed in Patent Document 1. Patent Document 1 discloses a configuration in which a transparent urethane film with an adhesive layer on the back surface is attached to the surface of a nonwoven fabric sheet that has a window (visible portion) in the center and an adhesive layer on the back surface, and the nonwoven fabric sheet is placed over the puncture site of a catheter so that the back surface of the nonwoven fabric sheet is attached to the skin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-68721 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in existing medical dressing materials such as that described in Patent Document 1, an adhesive layer is attached to the entire back surface of the urethane film. While this adhesive layer plays an important role in integrating the dressing with the nonwoven fabric sheet, the adhesive layer of the urethane film also sticks to the needle hub of the catheter placed at the puncture site, posing a risk of incidents such as the unintentional removal of the needle hub when the dressing is replaced.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a medical dressing material that can prevent incidents such as the needle hub of a catheter being removed during replacement. [Means for solving the problem]

[0007] The present invention relates to a medical dressing material comprising a dressing body having a back surface facing the skin and a front surface opposite the back surface, and a release sheet removably attached to the back surface, the back surface having an adhesive portion and a non-adhesive portion, the non-adhesive portion having a vertical and horizontal width of 40 mm or more, and the adhesive portion being formed to surround the non-adhesive portion.

[0008] In this case, even if the needle hub is fixed to the skin using the dressing body, it is possible to reduce the possibility of the hub body and wings, which are components of the needle hub, coming into contact with the adhesive portion, thereby reducing the risk of the needle hub and other components moving together when the dressing body is replaced, resulting in unintended removal of the needle hub.

[0009] In the present invention, the non-adhesive portion may be more flexible than the adhesive portion. In this case, when the dressing body is applied to the skin so as to cover the needle hub, the non-adhesive portion deforms preferentially, so that even if the needle hub and the non-adhesive portion are moved in contact with each other, stress from the needle hub is less likely to act on the adhesive portion, preventing the adhesive portion from being deformed and fixed in a wrinkled state.

[0010] In the present invention, the film sheet may be made of a stretchable film, and the non-adhesive portion may be formed to be more stretchable than the adhesive portion, so that even if the position of the needle hub relative to the dressing body is slightly misjudged, the non-adhesive portion in contact with the needle hub will stretch and cover the needle hub.

[0011] In the present invention, the dressing body may comprise a film sheet and a skin fixing sheet cut out in the center, and the skin fixing sheet may be bonded to the film sheet at the opposing surface. By making the adhesive portion a multi-sheet structure and the non-adhesive portion a single-sheet structure in this way, it is possible to achieve more stable adhesiveness in the adhesive portion than by making the adhesive and non-adhesive portions a single sheet, or by making the adhesive portion a single-sheet structure and the non-adhesive portion a multi-sheet structure.

[0012] In the present invention, the surface of the skin fixing sheet is in contact with the film sheet, and the back surface of the skin fixing sheet forms a contact surface that contacts the skin. In this case, the adhesive area can be increased more efficiently than when the skin fixing sheet is provided so as to cover the outside of the film sheet, and an adhesive portion suitable for a dressing body having a non-adhesive portion can be realized.

[0013] In addition, in the present invention, the film sheet and the skin fixing sheet are fixed by an adhesive layer provided on the skin fixing sheet, and the skin fixing sheet is a nonwoven fabric sheet with adhesive layers on both sides, and the film sheet may be a urethane film. In this case, since a urethane film without any adhesive layer is used, there is also the additional effect of obtaining better breathability and moisture permeability than when using a urethane film with an existing polyurethane adhesive layer.

[0014] Furthermore, in the conventional method of providing an adhesive layer on the urethane film to integrate it with a nonwoven fabric sheet, it was necessary to use a nonwoven fabric sheet with a smooth surface to increase adhesion, but if an adhesive layer is attached to the nonwoven fabric sheet to integrate it with the urethane film, high adhesion to the smooth urethane film will naturally be achieved.

[0015] The present invention may further include a fixing tape that can be separated from the dressing body. In this case, the fixing strength can be compensated for in areas where the adhesive portion has weak adhesion to the skin. That is, a dressing body having a non-adhesive portion has weaker adhesive strength than a conventional dressing body by the area of ​​the non-adhesive portion, and adhesion between the dressing body and the skin is likely to decrease over time. In particular, on the side where the tube extending outward from the needle hub is present, a portion of the adhesive portion floats off the skin due to the presence of the tube, which may lead to the adhesive portion peeling off from the skin over time near the tube. While it is possible to increase the adhesive area on the side where the tube is present, this would result in problems such as the orientation of the sheet member relative to the needle hub being fixed or the size increasing. In contrast, the provision of a fixing tape allows for further application of the fixing tape to the side where the tube is present after the dressing body has been applied, reinforcing the adhesive strength and making the dressing body less likely to peel off from the skin even when fixed for a long period of time.

[0016] The present invention may further comprise a retaining sheet detachably attached to the surface of the dressing body, the retaining sheet having a retaining portion extending beyond the outer shape of the dressing body. In this case, the dressing body can be applied without touching the adhesive portion with the fingers, and it is possible to prevent a situation in which the adhesive portion is accidentally touched by the fingers when applying the dressing body to the skin, resulting in a reduction in adhesive effect due to sebum.

[0017] In the present invention, the resistance to peeling of the retaining sheet from the dressing body may be set to be greater than the resistance to peeling of the release sheet from the dressing body, thereby reducing the likelihood of the retaining sheet peeling off from the dressing body when the user peels the release sheet off from the dressing body.

[0018] In the present invention, the width of the non-adhesive portion may be longer than the width of the adhesive portion along at least one of the vertical and horizontal axes that intersect at right angles and pass through the center of the dressing body, and the width from the outer edge of the non-adhesive portion to the outer edge of the adhesive portion may be 10 mm or more. If the width of the non-adhesive portion is longer than the width of the adhesive portion, it is possible to reduce the occurrence of the needle hub coming into contact with the adhesive portion. Furthermore, when the non-adhesive portion is a flexible film sheet, by making the width from the outer edge of the non-adhesive portion to the outer edge of the adhesive portion 10 mm or more, combined with the wide width of the non-adhesive portion, the adhesive portion is less likely to wrinkle, achieving stable adhesion and reducing the occurrence of the dressing body peeling off from the skin.

[0019] Furthermore, the present invention also relates to a medical dressing material comprising a nonwoven fabric sheet having a window opening at a desired position and having adhesive layers on both sides, a transparent urethane film having a non-adhesive portion and inseparably attached to the surface of the nonwoven fabric sheet, and a release sheet releasably attached to the back surface of the nonwoven fabric sheet.

[0020] In this case, when in use, the release paper is peeled off from the back of the nonwoven fabric sheet, and the sheet is placed over the puncture site of the catheter and the back of the nonwoven fabric sheet is attached to the skin.The nonwoven fabric sheet firmly fixes the catheter tube, etc., making it possible to observe the puncture site through the window, thereby providing the same conventional function of protecting the puncture site hygienically.

[0021] In this case, instead of the conventional urethane film which has an adhesive layer covering the entire back surface, a urethane film with no adhesive layer at all is used, and the adhesive layer attached to the surface of the nonwoven fabric sheet with a window is used to integrate the urethane film and the nonwoven fabric sheet.Therefore, the part of the urethane film covering the window of the nonwoven fabric sheet is maintained as an area with no adhesiveness, eliminating the risk of the urethane film sticking to the needle hub of the catheter placed in the puncture site, and as a result, incidents such as unintentional removal of the needle hub during replacement are prevented.

[0022] Furthermore, because it uses a urethane film with no adhesive layer at all, it has the added benefit of providing better breathability and moisture permeability than urethane films with existing polyurethane adhesive layers.

[0023] Furthermore, in the conventional method of providing an adhesive layer on the urethane film to integrate it with a nonwoven fabric sheet, it was necessary to use a nonwoven fabric sheet with a smooth surface to increase adhesion, but if an adhesive layer is provided on the nonwoven fabric sheet to integrate it with the urethane film, high adhesion to the smooth urethane film will naturally be achieved.

[0024] Furthermore, in carrying out the present invention more specifically, it is preferable that the release paper be formed with an outer shape larger than that of the nonwoven fabric sheet, and that the portion that protrudes from the outer shape of the nonwoven fabric sheet be formed to form a gripping portion that makes the peeling operation easier. In this way, the release paper can be easily peeled off by pinching the gripping portion with the fingertips.

[0025] In addition, in the present invention, it is preferable that the carrier is formed with an outer shape larger than the urethane film, and that the portion that protrudes from the outer shape of the urethane film is formed to form a holding portion that makes it easier to apply the urethane film to the skin.In this way, after peeling off the release paper, the urethane film and nonwoven fabric sheet can be handled by grasping the holding portion, making it possible to apply the urethane film and nonwoven fabric sheet to the skin without touching the back surface of the urethane film and nonwoven fabric sheet. [Effects of the Invention]

[0026] According to the medical dressing material of the present invention described above, it is possible to realize a medical dressing material that can prevent incidents such as the needle hub of a catheter being removed during replacement. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a plan view showing an example of an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded view showing the medical dressing of FIG. 1 in an overlapping state. [Figure 3] FIG. 3 is an exploded view showing the medical dressing of FIG. 2 with each component arranged. [Figure 4] FIG. 4 is an explanatory view schematically showing a cross section of the dressing body of FIG. 3. [Figure 5] FIG. 2 is a plan view showing the state in which the dressing body of FIG. 1 is attached. [Figure 6] FIG. 6 is a cross-sectional view for schematically explaining the applied state of the dressing body of FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0029] Figures 1 to 4 show an example of a form for implementing the present invention, with Figure 1 showing a plan view of the medical dressing material 1 of this embodiment in a state before use, Figure 2 showing an exploded view of the components of the medical dressing material of Figure 1, including their overlapping state, Figure 3 showing an exploded view of the medical dressing material of Figure 2, with each component arranged in overlapping order from bottom to top, and Figure 4 showing a schematic cross-section of some of the components of Figure 3 for ease of explanation.

[0030] 1 to 4 includes a nonwoven fabric sheet 5 (skin fixation sheet) having a central window 2 and adhesive layers 3, 4 (see the schematic diagram in FIG. 4) on both sides (front and back), a transparent urethane film 6 (film sheet) covering the entire outer surface of the nonwoven fabric sheet 5 and being non-removably attached by the adhesive layer 3 on the front side of the nonwoven fabric sheet 5, and a release paper 7 (release sheet) covering at least the entire outer surface of the nonwoven fabric sheet 5 and being removably attached by the adhesive layer on the back side of the nonwoven fabric sheet 5, and the nonwoven fabric sheet 5 and the urethane film 6 together form a dressing body 8 that is substantially adhered to the skin. Note that although the most suitable materials are described for the skin fixation sheet, film sheet, and release sheet, the materials are not limited thereto.

[0031] The release paper 7 is formed with an outer shape larger than that of the nonwoven fabric sheet 5, and the portions that protrude from the outer shape of the nonwoven fabric sheet 5 are formed to form gripping portions 7a, 7b, and 7c that make the peeling operation easier. More specifically, a convex gripping portion 7a is formed on the upper side in Figure 3, and bifurcated gripping portions 7b and 7c are formed on the lower side in Figure 3.

[0032] Moreover, in this embodiment in particular, a sheet-like carrier 9 is provided which covers at least the entire outer surface of the urethane film 6 and is integrally adhered to the surface so that it can be peeled off and cannot be reattached, thereby imparting shape retention ability, and this carrier 9 has an opening 10 formed therein which corresponds to the window portion 2 of the nonwoven fabric sheet 5.

[0033] Furthermore, the integral adhesion between the carrier 9 and the urethane film 6 is achieved by making them adhere in this manner during the manufacturing stage without using an adhesive layer between them, and once they are peeled off, no adhesiveness remains in either the carrier 9 or the urethane film 6.

[0034] Here, an S-shaped cut line 11 is made on one side of the opening 10 in the carrier 9, dividing the carrier 9 at this position, and by cutting and raising one side of the cut line 11, a starting point is created for starting to peel off the carrier 9 after the dressing body 8 is finally attached to the skin.

[0035] Furthermore, as shown particularly in Figure 3, the carrier 9 has an outer shape that roughly corresponds to the release paper 7 and is formed with an outer shape larger than the urethane film 6, and the parts that protrude from the outer shape of the urethane film 6 form holding portions 9a, 9b, 9c that make it easier to apply the film to the skin.

[0036] Furthermore, notches 9d, 9e and notches 9f, 9g are formed on both sides of the holding portion 9a corresponding to the convex gripping portion 7a of the release paper 7 and on the outside of each of the holding portions 9b, 9c corresponding to the bifurcated gripping portions 7b, 7c of the release paper 7 to facilitate peeling off the fixing tapes 12, 13, 14 described below, and the shapes of the gripping portions 7a, 7b, 7c on the release paper 7 side differ by the amount of these notches.

[0037] That is, a plurality of fixing tapes 12, 13, 14 as shown in Figures 1 to 3 are removably attached to the surface of each holding portion 9a, 9b, 9c of the carrier 9, so that they can be used to reinforce the catheter 15 (see Figure 5) if necessary, and when the release paper 7 is peeled off, the aforementioned notches 9d, 9e and notches 9f, 9g expose part of the adhesive surface of each of the fixing tapes 12, 13, 14, creating a starting point for starting to peel off each of the fixing tapes 12, 13, 14.

[0038] In this embodiment, a tube slot 16 that straddles a tube 15a of a catheter 15 (described later) is formed on one side of the dressing body 8, and a shape corresponding to the tube slot 16 is also provided in the release paper 7 and the carrier 9, but it goes without saying that tube slots 16 may be formed in multiple locations on the dressing body 8. Furthermore, the carrier 9 and fixing tapes 12, 13, and 14 described in this embodiment are optional and may be attached as needed.

[0039] When the medical dressing material 1 is constructed in this manner, when in use, the release paper 7 is peeled off from the back of the nonwoven fabric sheet 5, and as shown in Figure 5, the nonwoven fabric sheet 5 is placed over the puncture site of the catheter 15 and the back of the nonwoven fabric sheet 5 is attached to the skin.The nonwoven fabric sheet 5 firmly fixes the tube 15a of the catheter 15, making it possible to observe the puncture site through the window 2, thereby fulfilling the conventional function of protecting the puncture site hygienically.

[0040] In this case, as shown schematically in Figure 6, instead of the conventional urethane film which has an adhesive layer covering the entire back surface, a urethane film 6 which has no adhesive layer at all is used, and the adhesive layer 3 attached to the surface of the nonwoven fabric sheet 5 having the window portion 2 is used to integrate the urethane film 6 with the nonwoven fabric sheet 5. Therefore, the part of the urethane film 6 which covers the window portion 2 of the nonwoven fabric sheet 5 is maintained as a completely non-adhesive area (non-adhesive portion), and there is no need to worry about it sticking to the needle hub 15b of the catheter 15 placed in the puncture site, thereby preventing incidents such as the unintentional removal of the needle hub 15b when changing it.

[0041] In particular, it is preferable that the non-adhesive portion has a vertical width (see L1 in Figure 3) and a horizontal width (see L2 in Figure 3) of 40 mm or more. By doing so, it has been confirmed that the adhesive portion does not come into contact with the hub body and wings of the catheter in the product described in Japanese Patent No. 4853516 (registered trademark: Safe Touch Coreless Needle). That is, the product has a width of 30 mm including the hub body and wings, and the height of the hub body is 10 mm. By having the non-adhesive portion have a vertical and horizontal width of 40 mm or more, it is possible to prevent the adhesive portion from coming into contact with the needle hub, which would otherwise stick to the needle hub and cause the needle hub to move when the dressing body 8 is replaced.

[0042] Although the non-adhesive portion is preferably wide enough to completely cover the needle hub, even if the vertical and horizontal widths are less than 40 mm, the presence of the non-adhesive portion makes it possible to minimize the adhesive surface area with the needle hub and reduce the possibility of the needle hub moving when the dressing body is replaced. Therefore, the vertical and horizontal widths of the window portion 2 and non-adhesive portion formed by the nonwoven fabric sheet 5 and urethane film 6 described in the embodiment may be less than 40 mm.

[0043] Thus, while a dressing body 8 having a non-adhesive portion can eliminate problems when changing the dressing body 8, it also creates the problem of a smaller adhesive area and weaker adhesive strength compared to conventional dressings. The adhesive area can be increased by widening the width of the dressing body 8, but increasing the size of the dressing body 8 reduces maneuverability. While examining the components and shapes of the medical dressing 1 under these conditions, the applicant focused on the fact that, unlike conventional dressing bodies 8 having a non-adhesive portion, the needle hub 15b can slide on the dressing body 8 via the non-adhesive portion, and discovered various configurations that can solve the problem.

[0044] One is a configuration in which the flexibility of the non-adhesive portion is higher than that of the adhesive portion. By doing so, when the needle hub 15b contacts the non-adhesive portion, the portion to which stress is applied from the needle hub 15b deforms, making it easier to three-dimensionally recognize the position of the needle hub 15b in the non-adhesive portion and adjust the needle hub 15b to the appropriate position. This makes it easier to adjust the position so that the entire adhesive portion is positioned on the skin when attached, ensuring a stable adhesive surface area with the skin. Furthermore, by making the flexibility of the non-adhesive portion higher than that of the adhesive portion, stress generated by the needle hub 15b is less likely to act on the adhesive portion. Therefore, during adjustment of the position of the needle hub 15b while the needle hub 15b is in contact with the non-adhesive portion, the adhesive portion is less likely to deform due to stress generated by the needle hub 15b, reducing the risk of wrinkles forming on the adhesive surface. Therefore, even if the adhesive portion has a small area, it can be stably and efficiently attached to the skin.

[0045] One is to configure the non-adhesive portion to be more stretchable than the adhesive portion. When applying the dressing body 8, the user may view it as a flat surface and forget that the width of the non-adhesive portion must be equal to the height of the needle hub 15b. Or, they may perform the fastening process assuming that the dressing body 8 is parallel to the needle hub 15b, even though it is not. In this case, the non-adhesive portion may not completely cover the hub body or wings, and the needle hub 15b may come into contact with the adhesive portion. This not only causes problems during dressing replacement, but also reduces the adhesive surface area with the skin, potentially causing the dressing body 8 to peel off from the skin during use. However, if the non-adhesive portion is configured to be stretchable, even if the user slightly misjudges the fastening position, the non-adhesive portion in contact with the needle hub 15b will stretch, making it less likely that the adhesive portion will come into contact with the needle hub 15b, thereby stabilizing the adhesive surface area with the skin. Furthermore, if the non-adhesive portion has higher elasticity than the adhesive portion, the non-adhesive portion in contact with needle hub 15b will stretch preferentially, so that stress from needle hub 15b is less likely to reach the adhesive portion, and the adhesive portion is less likely to wrinkle. The non-adhesive portion may be a non-elastic sheet such as food wrap, but in this case, since it does not stretch easily, it is preferable that it has elasticity in order to stabilize the adhesive area with the skin.

[0046] In an embodiment, to achieve the non-adhesive portion, the adhesive portion has a multi-sheet structure, while the non-adhesive portion has a single-sheet structure. If the adhesive portion has a single-sheet structure and the non-adhesive portion has a multi-sheet structure, i.e., if a sheet without an adhesive portion is fixed to the center of a sheet that is entirely adhesive to form the non-adhesive portion, a step will be created on the skin at the boundary between the adhesive portion and the non-adhesive portion. Therefore, in order to efficiently increase the adhesive area with the skin, it is preferable to have the adhesive portion have a multi-sheet structure and the non-adhesive portion have a single-sheet structure. While it is possible to achieve the adhesive portion and the non-adhesive portion with a single-sheet structure, in that case, the adhesive layer may be unstable and the adhesiveness may be weakened. Furthermore, if the flexibility or stretchability of the non-adhesive portion is to be higher than that of the adhesive portion, adjustment of the thickness, etc. will be necessary.

[0047] In this embodiment, the nonwoven fabric sheet 5 is configured so that its front surface abuts the urethane film 6, and its back surface forms the abutment surface that abuts against the skin. It is also possible to arrange the nonwoven fabric sheet 5 with the window portion 2 so that it covers the outside of the urethane film 6, but in this case, the nonwoven fabric sheet 5 would inevitably protrude from the outer shape of the urethane film 6, and the adhesive portion would also be configured to be relatively flexible. As a result, it would be prone to wrinkling, and if an attempt were made to address this by increasing the contact area with the skin, the dressing body 8 would become larger. In order to realize a dressing body 8 having a non-adhesive portion, it is preferable that the nonwoven fabric sheet 5 be configured so that its front surface abuts the urethane film 6, and its back surface forms the abutment surface that abuts against the skin.

[0048] Moreover, since the urethane film 6 has no adhesive layer at all, there is an added benefit of obtaining better breathability and moisture permeability than when using a urethane film with an existing polyurethane adhesive layer.

[0049] Furthermore, in the conventional method of providing an adhesive layer on the urethane film 6 side to integrate it with the nonwoven fabric sheet 5, it was necessary to use a nonwoven fabric sheet 5 with a smooth surface to increase adhesiveness, but if an adhesive layer 3 is attached to the nonwoven fabric sheet 5 side to integrate it with the urethane film 6, high adhesiveness is naturally obtained for the smooth urethane film 6. Furthermore, because nonwoven fabric has no elasticity, the elasticity of the adhesive portion can be greatly reduced, and a configuration in which the elasticity of the non-adhesive portion is higher than that of the adhesive portion can be easily achieved.

[0050] The non-adhesive portion is surrounded by the adhesive portion on its periphery, and the shape of the non-adhesive portion can be various, such as a circle, but can also be a rounded rectangle. In this case, compared to a circle, it is possible to reduce the possibility of the adhesive portion coming into contact with the needle hub 15b even if the needle hub 15b is positioned slightly off-center from the center of the non-adhesive portion. Furthermore, since it is unlikely that part of the needle hub 15b will be positioned on the edge of a non-rounded shape, a rounded rectangle can increase the area of ​​the adhesive portion. It is preferable that the entire periphery of the non-adhesive portion is surrounded by the adhesive portion, but it is also possible that only part of the periphery of the non-adhesive portion is surrounded by the adhesive portion.

[0051] The non-adhesive portion has a width of 40 mm or more on the vertical axis (the vertical axis in FIG. 3 ) and the horizontal axis (the left-right axis in FIG. 3 ), and is located at the center P of the dressing body 8. On the vertical and horizontal axes that intersect at right angles and pass through the center P, the non-adhesive portion has a width greater than that of the adhesive portion. That is, on the horizontal axis passing through the center P, the adhesive portion is located so as to sandwich the non-adhesive portion, and is divided into an adhesive portion on one side and an adhesive portion on the other side opposite the one side, and the width of the non-adhesive portion (L2 in FIG. 3 ) is greater than the sum of the widths of the adhesive portion on one side and the adhesive portion on the other side on the horizontal axis (L3 + L4 in FIG. 3 ). Furthermore, on the horizontal axis running from the center P to a point 20 mm above the vertical axis, the width of the non-adhesive portion is also greater than the sum of the widths of the adhesive portions, and on the horizontal axis running from the center P to a point 20 mm below the vertical axis, the width of the non-adhesive portion is also greater than the sum of the widths of the adhesive portions. This relationship is the same over the range from 20 mm above the center to 20 mm below the vertical axis.

[0052] Furthermore, while the above has described the relationship of width dimensions along the horizontal axis, the same applies to the relationship of width dimensions along the vertical axis (reference numerals are omitted in FIG. 3 for ease of explanation). The width of the non-adhesive portion is longer than the total width of the adhesive portion on the vertical axis extending from the center P to a point 20 mm to the left of the horizontal axis, and the width of the non-adhesive portion is longer than the total width of the adhesive portion on the vertical axis extending from the center P to a point 20 mm to the right of the horizontal axis. This relationship is the same from 20 mm to 20 mm to the left of the horizontal axis. Unlike the embodiment, the width of the non-adhesive portion on only one of the vertical and horizontal axes may be longer than the total width of the adhesive portion. Furthermore, the width from the outer end of the non-adhesive portion to the outer end of the adhesive portion (L3 or L4 in FIG. 3) is set to 10 mm or more.

[0053] It was confirmed that such width dimensions enable the dressing body 8 to be fixed to the skin for a long period of time. Specifically, the larger non-adhesive area improves flexibility and stretchability, making the adhesive area less likely to wrinkle. Furthermore, since a certain amount of adhesive area is secured in the adhesive area, the dressing body 8 is less likely to peel off even when fixed to the skin, and is therefore durable for long-term use. Furthermore, the larger non-adhesive area reduces the likelihood of the adhesive portion coming into contact with the needle hub 15b without requiring special care during application. It was also confirmed that even if the width from the outer end of the non-adhesive portion to the outer end of the adhesive portion is 10 mm, long-term use is possible. However, in this case, a highly adhesive adhesive layer must be used, which may cause redness or other issues when peeling the dressing body 8 from the skin. Therefore, it is preferable that the width from the outer end of the non-adhesive portion to the outer end of the adhesive portion be 15 mm or more. In the embodiment shown in Figure 3, the vertical width from the outer edge of the non-adhesive portion to the outer edge of the adhesive portion is 18 mm, and the horizontal width from the outer edge of the non-adhesive portion to the outer edge of the adhesive portion is 28 mm. The vertical and horizontal widths of the non-adhesive portion are preferably 40 mm or more, and more preferably 50 mm to 90 mm. This makes it difficult for the needle hub 15b to come into contact with the adhesive portion even if an unintended clearance or gauze is inserted between the needle hub 15b and the skin, and also allows for easy handling of the dressing body 8. In the embodiment shown in Figure 3, the vertical and horizontal widths of the non-adhesive portion are 60 mm.

[0054] The release paper 7 is formed with an outer shape larger than the nonwoven fabric sheet 5, and the portions that protrude from the outer shape of the nonwoven fabric sheet 5 are formed to form gripping portions 7a, 7b, and 7c that make the peeling operation easier. Therefore, the release paper 7 can be easily peeled off by gripping the gripping portions 7a, 7b, and 7c with the fingertips.

[0055] Furthermore, a carrier 9 is provided that covers at least the entire outer surface of the urethane film 6 and adheres integrally to the surface so that it can be peeled off but cannot be reattached, thereby imparting shape-retaining ability.This makes it possible to impart shape-retaining ability to the urethane film 6 and nonwoven fabric sheet 5, which lose their stiffness after the release paper 7 is peeled off, and improves handling of the urethane film 6 and nonwoven fabric sheet 5 when applying them to the skin.

[0056] Furthermore, carrier 9 is formed with an outer shape larger than urethane film 6, and a pair of retaining portions 9a, 9b, and 9c that protrude from the outer shape of urethane film 6 facilitate application to the skin and are formed to sandwich dressing body 8. Therefore, after peeling off release paper 7, urethane film 6 and nonwoven fabric sheet 5 can be handled by pinching retaining portions 9a and 9b, 9c with the fingers of each hand, allowing application to the skin without touching the backsides of urethane film 6 and nonwoven fabric sheet 5. This allows application of dressing body 8 without touching the adhesive portion with the fingers, preventing a situation in which the adhesive effect is reduced by sebum caused by touching the adhesive portion with the fingers when applying dressing body 8 to the skin.

[0057] Furthermore, since the carrier 9 has an opening 10 corresponding to the window 2 of the nonwoven fabric sheet 5, the opening 10 of the carrier 9 ensures visibility through the window 2 of the nonwoven fabric sheet 5, and the carrier 9 does not impede visibility through the window 2 of the nonwoven fabric sheet 5. In addition, when the non-adhesive portion comes into contact with the needle hub 15b and deforms, the carrier 9 does not impede the deformation.

[0058] According to the above embodiment, the portion of the urethane film 6 covering the window portion 2 of the nonwoven fabric sheet 5 can be maintained as a completely non-adhesive area, thereby preventing the urethane film 6 from sticking to the catheter needle placed in the puncture site and reducing incidents such as unintentional removal of the catheter needle when replacing it.Furthermore, by using a urethane film 6 that has no adhesive layer at all, it is possible to obtain even better breathability and moisture permeability than when using a urethane film 6 that has an existing polyurethane adhesive layer.

[0059] Furthermore, the release paper 7 can be easily peeled off by pinching the gripping portions 7a, 7b, 7c with the fingertips, facilitating the peeling operation of the release paper 7 and reducing the workload required for applying and replacing the medical dressing 1. Furthermore, by setting the peel resistance of the carrier 9 to the dressing body 8 greater than the peel resistance of the release paper 7 to the dressing body 8, it is possible to reduce the likelihood of the carrier 9 peeling off from the dressing body 8 when the user is removing the release paper.

[0060] Furthermore, the carrier 9 can impart shape retention to the urethane film 6 and nonwoven fabric sheet 5, which lose their stiffness after the release paper 7 is peeled off, and improves the handling of the urethane film 6 and nonwoven fabric sheet 5 when applying them to the skin, thereby further reducing the workload required to apply and replace the medical dressing material 1.

[0061] Furthermore, after the dressing body 8 is applied to the skin, it remains fixed on the skin for an extended period of time. The dressing body 8 having a non-adhesive portion has a smaller adhesive area than conventional dressings, and a portion of the adhesive portion on the side where the tube 15a extending outward from the needle hub 15b is present is raised from the skin due to the presence of the tube 15a. As a result, the adhesive portion near the tube 15a gradually peels off from the skin during daily activities, reducing the adhesiveness and potentially causing the dressing body 8 to unintentionally peel off from the skin. While it would be possible to increase the adhesive area on the side where the tube 15a is present, this would increase the size of the dressing body 8, making it difficult to handle, or would impose a fixed orientation of the dressing body 8 relative to the needle hub 15b, making it difficult to apply to the skin, thereby causing unnecessary stress to the user. In contrast, by providing detachable fixing tapes 12, 13, and 14 on the dressing body 8, it is possible to reinforce the adhesive strength by further attaching fixing tapes 12, 13, and 14 to the side on which the tube 15a is located after the dressing body 8 has been attached. In this way, even if the dressing body 8 has a non-adhesive portion, the dressing body 8 can be made less likely to peel off from the skin over a long period of time.

[0062] Furthermore, by handling the urethane film 6 and nonwoven fabric sheet 5 by holding the holding portions 9a, 9b, and 9c after peeling off the release paper 7, the urethane film 6 and nonwoven fabric sheet 5 can be applied to the skin without touching the backside of the urethane film 6 and nonwoven fabric sheet 5, and the puncture site and the surface that comes into contact with the skin can be kept clean.

[0063] Furthermore, the opening 10 of the carrier 9 ensures visibility from the window portion 2 of the nonwoven fabric sheet 5, thereby preventing the problem of the carrier 9 impeding visibility from the window portion 2 of the nonwoven fabric sheet 5 from occurring.

[0064] The medical dressing of the present invention is not limited to the above-described exemplary embodiment, and the release paper and carrier may have shapes other than those shown in the drawings, and the release paper and carrier may be divided into multiple parts as necessary. Furthermore, although the illustrated example describes a case in which the entire window area of ​​the nonwoven fabric sheet (skin fixation sheet) is non-adhesive, it is also possible to make only a portion of the window area non-adhesive. Of course, various other modifications can be made within the scope of the present invention. Furthermore, while the medical dressing of the present invention is particularly suitable for fixing needle hubs to the skin, the object to be fixed is not limited to needle hubs, and other medical devices may also be fixed. [Explanation of symbols]

[0065] 1. Medical dressings 2 Window section 3. Adhesive layer 4 Adhesive layer 5. Nonwoven fabric sheet (skin fixation sheet) 6 Urethane film (film sheet) 7 Release paper (release sheet) 7a Knob 7b Knob 7c Knob 9 Carrier (retaining sheet) 9a Holding part 9b Holding part 9c Holding part 9d Notch 9e Notch 9f Notch 9g Notch 10 Opening

Claims

1. a dressing body having a back surface facing the skin and a surface opposite to the back surface; a release sheet removably attached to the back surface, the back surface has an adhesive portion and a non-adhesive portion, The non-adhesive portion has a vertical width and a horizontal width of 40 mm or more, A medical dressing material characterized in that the adhesive portion is formed so as to surround the non-adhesive portion.

2. A medical dressing material characterized by comprising a nonwoven fabric sheet having a window opening at a desired position and having adhesive layers on both sides, a transparent urethane film having a non-adhesive portion and being inseparably attached to the surface of the nonwoven fabric sheet, and a release sheet releasably attached to the back surface of the nonwoven fabric sheet.

Images