Cannula fixation plaster

Abstract

Plaster for fixing cannulas with a carrier arrangement (10) that can be fixed to the skin surrounding the cannula insertion site by means of an adhesive surface and a barrier layer (100) arranged on the side of the carrier arrangement (10) facing away from the adhesive surface, which inhibits the migration of bacteria and covers the cannula insertion site, characterized in that the carrier arrangement (10) has a receptacle (20) that penetrates the carrier arrangement (10) and is covered by the barrier layer (100) and designed to receive a ridge-shaped grasping aid for the cannula, wherein the receptacle (20) is designed as a generally approximately straight receiving slot (20), and wherein the receptacle (20) is suitable for absorbing tensile forces acting on the cannula and transmitting them to the adhesive surface.

Description

[0001] The invention relates to a plaster for fixing cannulas, comprising a carrier arrangement which can be fixed to the skin surrounding the cannula insertion site by means of an adhesive surface, and a barrier layer arranged on the side of the carrier arrangement facing away from the adhesive surface, which inhibits the migration of bacteria and covers the cannula insertion site.

[0002] Such plasters are described, for example, in DE 20 2007 007 634 U1. The backing layer consists of a nonwoven fabric coated with an adhesive on one side and covered by a transparent polyurethane film forming the barrier layer on the other. The known plasters have an observation opening that completely surrounds the backing layer and is covered by the polyurethane film. This observation opening allows visual inspection of the cannula insertion site during and after application of the plaster.

[0003] The known plasters further have a recess 28 penetrating the carrier arrangement and the barrier layer, which is penetrated by the cannula tube, so that a part of the plaster is arranged between the cannula and the skin after application, while the other part of the plaster covers the cannula and the cannula insertion site, whereby the cannula insertion site remains visible through the observation opening.

[0004] Although the application of the known plasters is relatively simple and allows visual inspection of the cannula insertion site, it has been shown that in some cases, the cannula may unintentionally detach from the skin and / or an infection of the cannula insertion site may occur. Similar problems are also observed with plasters according to WO 2014 / 005140 A1, which include an additional fixation strip.

[0005] WO 2014 / 039 891 A2 discloses: A medical device, e.g., a catheter, is attached to a patient by means of a fastening device. The fastening device may comprise a bracket and an anchoring pad. Certain devices may also include, for example, straps, tabs, bandages, grooves, and recesses for fastening the medical device to the patient. The bracket may include a recess and / or a channel. At least one surface of the bracket may be coated with an adhesive.

[0006] In view of these problems in the prior art, the invention is based on the objective of providing a plaster for fixing cannulas which, on the one hand, enables reliable cannula fixation and, on the other hand, is able to reduce the risk of infection.

[0007] According to the invention, this problem is solved by a further development of the known plasters for fixing cannulas, which is essentially characterized in that the carrier arrangement has a receptacle penetrating the carrier arrangement, which is covered by the barrier layer and designed to receive a preferably ridge-shaped grasping aid of the cannula.

[0008] The invention is based on the finding that known plasters for fixing cannulas are insufficient to absorb the tensile forces acting on the cannula tubing as it passes through the recess in the carrier assembly and the barrier layer, which can lead to the cannula unintentionally coming loose. Furthermore, the recess in the barrier layer, which is required for the cannula tubing to pass through in known plasters, represents a weak point through which bacteria can reach the cannula insertion site and cause infections.

[0009] In plasters according to the invention, the generally ridge-shaped grasping aid of the cannula, which is rather cumbersome when applying known plasters, is utilized. For this purpose, the carrier assembly is equipped with a receptacle designed to receive this grasping aid. The receptacle is surrounded by the adhesive surface of the carrier assembly. The receptacle absorbs tensile forces acting on the cannula and thus also on the grasping aid, transferring them to the adhesive surface. This provides strain relief in the area of ​​the cannula insertion site and secure fixation of the cannula. The receptacle is covered by the barrier layer. This prevents the penetration of bacteria into the area of ​​the cannula insertion site and achieves additional fixation.

[0010] Surprisingly, it has been shown that even with the comparatively thin support arrangement, generally implemented as a non-woven layer, sufficient tensile force relief can be achieved via the gripping aid incorporated in the receptacle, whereby the barrier layer is generally flexible, so that a bulge occurs in the area of ​​the gripping aid incorporated in the receptacle of the barrier layer, which is also preferably designed in the form of a transparent polyurethane film within the scope of the invention.

[0011] Given that the gripping aid of conventional cannulas is generally rib-shaped, it has proven particularly advantageous for the receptacle penetrating the carrier assembly to have an approximately straight receiving slot in the carrier assembly, which is preferably designed as a non-woven layer. In particular, the length of this slot can be adapted to the dimensions of the cannula's gripping aid. However, to ensure sufficient force transmission of the tensile forces acting on the cannula to the adhesive surface, the length of the slot is preferably less than 50%, and in particular less than 25%, of the width of the carrier assembly. To prevent the receiving slot from tearing out when the cannula tubing is subjected to pressure, the length of the slot should be approximately 25%.However, with regard to the tensile forces acting on the gripping aid, it has proven advantageous if the length of the slot is more than 7%, preferably more than 12%, of the width of the support arrangement in the area of ​​the slot. In preferred embodiments of the invention, the length of the receiving slot is between 4 and 15 mm, preferably between 6 and 13 mm, and in particular about 8 mm.

[0012] With regard to avoiding weak points in the area of ​​the ends of the receiving slot, it has proven advantageous for the width of the slot, in a direction perpendicular to its longitudinal direction, to be more than 10%, preferably more than 20%, of the slot length. However, to ensure sufficient retention of a ridge-shaped gripping aid in the receiving slot, it has proven advantageous for the width of the slot to be less than 50%, preferably less than 35%, of the slot length. In preferred embodiments of the invention, the slot width is approximately 0.5 to 5 mm, preferably approximately 1.5 to 3.5 mm, and particularly preferably approximately 2 mm.

[0013] A cannula fixation plaster according to the invention covers the cannula assembly without being penetrated by it. To mold the support arrangement to the cannula for reliable cannula fixation, it has proven advantageous to provide an indentation extending from an edge of the support arrangement, preferably running approximately parallel to the longitudinal direction of the slot, towards the receiving area. This indentation preferably tapers from a width exceeding the length of the slot in the region of the edge towards the slot and has a smaller width at its end facing the slot than the slot itself.

[0014] The width of the indentation at the edge can be approximately 10 to 20 mm, preferably approximately 12 to 16 mm, and particularly approximately 14 mm. At its end facing the receiving slot, the indentation can be rounded to prevent sharp points that could promote tearing, with a tangent applied to the apex of the rounding running approximately parallel to the longitudinal direction of the slot. A strip of the support arrangement with a width of more than 1 mm, particularly approximately 3 mm, is preferably provided between the receiving slot and the apex of the indentation.

[0015] Similar to the cannula fixation plasters known from DE 20 2007 007 634 U1, the carrier arrangement of the plaster according to the invention can have an observation opening, preferably on the side of the carrier arrangement facing away from the adhesive surface, which is in particular completely surrounded by the carrier arrangement in the manner of a frame and separated from the receiving area by a frame section of the carrier arrangement. The observation opening is spaced apart from the receiving slot in a direction perpendicular to the receiving slot, with the receiving slot being arranged between the observation opening and the indentation. The distance between the receiving slot and the observation opening, i.e., the width of the frame section, is preferably more than 1 mm, in particular about 3 mm.

[0016] In a particularly preferred embodiment of the invention, the width of the support arrangement in a direction parallel to the receiving slot is less in the area of ​​the observation opening than the width of the support arrangement in the area of ​​the indentation and / or the receiving area. This creates a fixing section outside the observation opening and at a distance from the cannula insertion point, which facilitates the fixation of the cannula.

[0017] From a manufacturing perspective and for ease of application, it has proven advantageous if the carrier arrangement as a whole is arranged approximately mirror-symmetrically with respect to a plane of symmetry that preferably runs approximately perpendicular to the receiving slot.

[0018] As mentioned above, the barrier layer, as with cannula fixation plasters according to the prior art, can also comprise a transparent polyurethane film in cannula fixation plasters according to the invention. Advantageously, the barrier layer is equipped, at least in the area of ​​the insertion and / or the observation opening, with an adhesive that promotes fixation of the plaster to the skin and / or the grasping aid.

[0019] Similar to conventional plasters, a cannula fixation plaster according to the invention can have a detachable, preferably multi-part, cover assembly, for example made of silicone paper, which expediently covers the entire plaster surface completely. If the cover assembly is multi-part, during application a first cover strip can first be removed from the surface, the exposed adhesive area thus fixed to the skin, and then the remaining cover strip(s) can be removed from the surface and the fixation completed.

[0020] The invention is explained below with reference to the drawing, to which express reference is made with regard to all details essential to the invention and not further highlighted in the description. The drawing shows: Fig. 1 a cannula fixation plaster according to a first embodiment of the invention and Fig. 2 a cannula fixation plaster according to a second embodiment of the invention.

[0021] In Fig. 1a) shows a top view of the cannula fixation plaster according to the invention in the direction of its barrier layer. Fig. Figure 1b) shows a detailed representation of the cannula fixation plaster according to Figure 1a). The in Fig. 1 The cannula fixation plaster shown comprises a carrier arrangement designated as 10 and shown hatched in the drawing, as well as a barrier layer 100 designed as a transparent polyurethane film, which completely covers the carrier arrangement 10.

[0022] The support assembly 10 has a frame 40 surrounding an observation opening 50 covered by the barrier layer 100. A receiving slot 20 is provided at a distance from the observation opening 50, between the observation opening 50 and an edge of the support assembly 10. This receiving slot extends through the support assembly and is covered by the barrier layer 100. On the side of the receiving slot 20 facing away from the observation opening 50, a recess is provided extending from an edge 22 of the support assembly 10 towards the receiving slot 20, tapering from the edge 42 of the support assembly 10 towards the receiving slot 20.

[0023] A strip of material from the support assembly 10, approximately 3 mm wide, is left free between the end of the indentation 30 facing the receiving slot 20 and the receiving slot itself. Similarly, a section of the support assembly 10, or frame 40, approximately 3 mm wide, is provided between the receiving slot 20 and the observation opening 50. The overall arrangement of the cannula fixation patch is approximately mirror-symmetrical with respect to a plane of symmetry S perpendicular to the longitudinal direction of the receiving slot 20. The width of the support assembly 10 in the region of the observation opening 50 is less than the width of the support assembly in the region of the receiving slot 20 or the indentation 30, in a plane perpendicular to the plane of symmetry S. This creates fixation wings 60 in the region of the receiving slot 20 or the indentation 30, which facilitate the fixation of the patch.

[0024] On the boundary surface facing away from the barrier layer 100, the carrier assembly 10 is equipped with an adhesive, which is covered by a multi-part silicone paper cover before application. The barrier layer 100, at least in the area of ​​the observation opening 50 and the receiving slot 20, is also equipped with an adhesive on its boundary surface facing the carrier assembly 10, which facilitates the overall fixation of the cannula fixation plaster. The barrier layer 100 is otherwise adhesively bonded to the carrier assembly 10.

[0025] In the embodiment of the invention shown in the drawing, the length of the receiving slot is 8 mm, and the width of the slot in a direction perpendicular to the longitudinal direction is 2 mm. The width of the fixing patch in the area of ​​the observation opening is a maximum of 50 mm, while in the area of ​​the indentation 20 it is a total of 55 mm. The end of the indentation 30 facing the receiving slot 20 is rounded in order to counteract tearing of the fixing patch in the area of ​​the apex of the indentation 30.

[0026] The in Fig. The embodiment of the invention shown in 2 differs essentially from the one shown in Fig. In the embodiment described in paragraph 1, the observation opening 50 is modeled on an animal head and the overall dimensions of the cannula fixation patch are smaller. However, the dimensions of the receiving slot 20, as well as the dimensions of the indentation 30, are smaller compared to the one described in paragraph 1. Fig. The embodiment of the invention shown in 1 is essentially unchanged. Fig.The cannula fixation plaster shown in Figure 2 is intended for the treatment of children. However, the dimensions of the receiving slot 20 and the indentation 30 take into account the fact that the cannula tube and grasping aid have the same dimensions in children as in the treatment of adults. It should also be noted that the fixation wings widen overall towards the edge of the fixation plaster running parallel to the receiving slot 20, in order to provide sufficient adhesive surface next to the indentation 30 with dimensions unchanged compared to the treatment of adults.

[0027] The invention is not limited to the embodiments illustrated in the drawing. Rather, it also encompasses the use of cannula fixation plasters without an observation opening and / or with modified dimensions. Instead of the tapered indentation, a rectangular indentation can also be provided. The width of the cannula fixation plaster in the area of ​​the indentation can be increased to achieve more reliable fixation.

[0028] The observation windows can, in principle, be designed in any shape. However, it is important to ensure that the width of the frame section between the observation window and the receiving slot, or between the receiving slot and the indentation, is sufficiently large to withstand tensile forces and prevent unintentional tearing.

[0029] In the embodiments illustrated with reference to the drawing, the support structure consists of a non-woven layer coated with an adhesive; it can also be a film layer. However, a non-woven layer has the advantage of being able to absorb exudate emerging from the cannula insertion site.

Claims

[1] Plaster for fixing cannulas comprising a carrier arrangement (10) which can be fixed to the skin surrounding the cannula insertion site by means of an adhesive surface and a barrier layer (100) arranged on the side of the carrier arrangement (10) facing away from the adhesive surface, which inhibits the migration of bacteria and covers the cannula insertion site, characterized by , that the carrier arrangement (10) has a receptacle (20) covered by the barrier layer (100) and designed to receive a ridge-shaped grasping aid of the cannula, penetrating the carrier arrangement (10), wherein the receptacle (20) is designed as a whole as an approximately straight receiving slot (20), and wherein the receptacle (20) is suitable to receive tensile forces acting on the cannula and to transmit them to the adhesive surface. [2] Plaster according to claim 1, characterized by, that the length of the receiving slot (20) is less than 50%, preferably less than 25% of the width of the support arrangement (10) in the longitudinal direction of the receiving slot (20) and / or more than 7%, preferably more than 12% of the width of the support arrangement (10) in the area of ​​the receiving slot (20). [3] Plaster according to any one of the preceding claims, characterized by , that the width of the receiving slot (20) in a direction perpendicular to its longitudinal direction is more than 10%, preferably more than 20% and / or less than 50%, preferably less than 35% of the receiving slot length. [4] Plasters according to any one of the preceding claims, characterized by, that the support arrangement (10) has a recess (30) extending from an edge (42) preferably running approximately parallel to the longitudinal direction of the receiving slot (20), which preferably tapers from a width exceeding the length of the receiving slot (20) towards the receiving slot (20) and has a smaller width at its end facing the receiving slot (20) than the receiving slot (20). [5] Plaster according to any one of the preceding claims, characterized by an observation opening (50) surrounded by the support arrangement (10) in the manner of a frame (40) and separated from the receiving (20) by a frame section of the support arrangement (10), preferably covered by the barrier layer (100) on the side of the support arrangement (10) facing away from the adhesive surface. [6] Plaster according to claim 5, characterized bythat the observation opening (50) is spaced apart from the receiving slot (20) in a direction perpendicular to the receiving slot (20), wherein the receiving slot (20) is preferably arranged between the observation opening (50) and the indentation (30). [7] Plaster according to claim 5 or 6, characterized by , that the width of the support arrangement (10) in the area of ​​the observation opening (50) is less than the width of the support arrangement (10) in the area of ​​the indentation (30) and / or the receptacle (20). [8] Plaster according to any one of the preceding claims, characterized by , that the support arrangement (10) is designed as a whole to be approximately mirror-symmetrical with respect to a plane of symmetry (S) which preferably extends approximately perpendicular to the receiving slot (20). [9] Plaster according to any one of the preceding claims, characterized by , that the barrier layer (100) has a transparent polyurethane film. [10] Plaster according to any one of the preceding claims, characterized by that the barrier layer (100) is equipped, at least in the area of ​​the application (20), with an adhesive agent that promotes the fixation of the plaster to the skin and / or the handling aid. [11] Plaster according to any one of claims 5 to 10, characterized by that the barrier layer (100) is equipped, at least in the area of ​​the observation opening (50), with an adhesive agent that promotes the fixation of the plaster to the skin and / or the grasping aid. [12] Plaster according to any one of the preceding claims, characterized by a cover arrangement that is detachably arranged on the adhesive surface, preferably in multiple parts.

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