# Patent

## Title
Window dressing

## Abstract

A self-adherent window dressing includes a fabric layer bounded by an edge. The fabric layer has an adhesive side, an opposite non-adhesive side, and an opening therein to allow for viewing therethrough. The opening is defined by a peripheral edge. A transparent film layer closes the opening and has first and second opposing sides. The film layer first side is non-adhesive and is mounted on the fabric layer adhesive side to close the opening in the fabric layer. The film layer second side has a skin adhering adhesive portion and an adhesive-free portion. The adhesive-free portion is disposed partially in the opening and extending beyond the peripheral edge of the opening. The film layer adhesive-free portion is adapted not to stick to a patient's skin, a connector, a catheter, or other medical device disposed between the film layer adhesive-free portion and skin.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of U.S. application Ser. No. 11/977,757 filed Oct. 26, 2007, now U.S. Pat. No. 7,674,948 which is a division of U.S. application Ser. No. 11/209,888 filed Aug. 23, 2005, now U.S. Pat. No. 7,294,751.


TECHNICAL FIELD
This invention relates to medical dressings, and more particularly to self-adherent window dressings for the protection, securement, and viewing of indwelling catheters, infusion needles, implanted port Huber access needles, medical tubing, or similar about an insertion site.
BACKGROUND OF THE INVENTION
It is known in the art relating to dressings for the protection and securement of catheters and infusion needles to use self-adherent dressings to cover all or part of the insertion site. Even more simply, often medical grade tape is used to secure catheters and infusion needles to a patient, as well as to secure medical tubing extending from the catheter or infusion needle. The adhesive on tape or conventional dressings, however, often sticks to medical apparatus such as catheters, connectors, tubing, etc., rendering removal of the tape or dressing difficult. This is problematic because dressings/tape often have to be replaced before indwelling catheters or infusion needles are finished being used. When the adhesive sticks to the medical apparatus, it can cause damage to the medical apparatus as well as the insertion site or vein or artery, upon removal of the dressing, requiring relocation of the medical apparatus, or other medical intervention.
In the case of window dressings, adhesive within the area of the window can become stuck to the insertion site and the medical apparatus (e.g., a catheter) covered by the dressing. Also, tubing extending from medical apparatus, such as lumen extending from a catheter hub, can become stuck to the adhesive on the bottom side of the dressing in an area between a peripheral edge of the window and an outer edge of the dressing. When it is necessary to remove the dressing, the adhesion of the dressing to the catheter and the lumen can cause unwanted movement or displacement of the catheter from the insertion site.
Furthermore, medical tubing connected to indwelling catheters, infusion needles and the like is often subjected to inadvertent but significant pulling forces either caused directly by patient movement or by snagging of the tubing on other objects. These pulling forces might peel the medical tape or dressing securing the tubing and/or catheter, infusion needle, etc. off of the patient's skin. This undesirably exposes the catheter, infusion needle, etc. to movement inward or outward, increasing the likelihood that the catheter, infusion needle, etc. will fail and have to be replaced and inserted into a new insertion site. Also, this may weaken the adhesion between the dressing and the patient's skin, potentially exposing the insertion site to harmful bacteria.
SUMMARY OF THE INVENTION
The present invention provides a self-adherent medical window dressing that permits visual inspection of an insertion site. The window dressing includes a non-adhesive portion that will not stick to catheters, infusion needles, tubing, etc. that are protected by the dressing, allowing for easy removal and replacement of the dressing without damaging the catheter, infusion needle, or ultimately the insertion site itself. Furthermore, the present window dressing may include a reinforcement layer that increases the resistance of the dressing from peeling away from a patient's skin caused by, for example, pulling forces exerted by medical tubing.
More specifically, a self-adherent window dressing in accordance with the present invention includes a fabric layer bounded by an edge. The fabric layer has an adhesive side, an opposite non-adhesive side, and an opening therein to allow for viewing therethrough. The opening is defined by a peripheral edge. A transparent film layer closes the opening and has first and second opposing sides. The film layer first side is non-adhesive and is mounted on the fabric layer adhesive side to close the opening in the fabric layer. The film layer second side has a skin adhering adhesive portion and an adhesive-free portion. The adhesive-free portion is disposed partially in the opening and extends beyond the peripheral edge of the opening. The film layer adhesive-free portion is adapted not to stick to a patient's skin, a connector, a catheter, or other medical device disposed between the film layer adhesive-free portion and skin.
Optionally, the adhesive-free portion may extend to the fabric layer edge. The window dressing may further include a reinforcement member adhered to at least a portion of the fabric layer and being disposed between the fabric layer and the transparent film layer. The film layer may generally extend to the fabric layer edge. The reinforcement member is a strengthening layer. The reinforcement member may be disposed between the outer edge of the opening and the fabric layer edge. The reinforcement member may be a netting material.
The dressing may also include a release liner having a releasable side contacting the film layer skin adhesive portion, the release liner generally extending to the film layer skin adhesive portion edge. Optionally, the release liner may include a first piece and a second piece that are folded such that each of the first and second pieces have a convenient grab tab formed by the fold. One of the pieces is releasable from the dressing without tampering with the other of the pieces.
In an alternative embodiment, a self-adherent window dressing in accordance with the present invention includes a fabric layer having an adhesive side, an opposite non-adhesive side, and an opening therein to allow for viewing therethrough. A transparent film layer closes the opening and has first and second opposing sides. The film layer first side is non-adhesive and is mounted on the fabric layer adhesive side to close the opening in the fabric layer. The film layer second side has a skin adhering adhesive portion and an adhesive-free portion. The adhesive-free portion is disposed partially in the opening and partially outside the opening. The film layer adhesive-free portion is adapted not to stick to a patient's skin, a connector, a catheter, or other medical device disposed between the film layer adhesive-free portion and skin.
Optionally, the adhesive-free portion may extend to an outer edge of the fabric layer.
These and other features and advantages of the invention will be more fully understood from the following detailed description of the invention taken together with the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is an exploded view of a window dressing in accordance with the present invention;
FIG. 1A is an exploded view of an alternative embodiment of the window dressing;
FIG. 2 is a side cross-sectional view of the window dressing taken along the line 2-2 in FIG. 1;
FIG. 2A is side cross-sectional view of the window dressing taken along the line 2A-2A in FIG. 1A; and
FIG. 3 is an environmental view of the window dressing illustrating the window dressing securing and protecting a Huber needle and tubing on a patient.



DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings in detail, numeral 10 generally indicates a self-adhering window dressing in accordance with the present invention. The window dressing includes an adhesive-free portion that allows for easy removal of the dressing without damage to or disturbance of the insertion site itself or to the catheter, infusion needle, infusion needle safety guard, tubing, or the like protected by the dressing. The window dressing may also resist edge peel forces exerted by medical tubing secured by the dressing.
Turning first to FIGS. 1 and 2, a self-adherent window dressing 10 in accordance with the present invention includes a fabric layer 12 bounded by an edge 14. The fabric layer 12 has an adhesive side 16, an opposite non-adhesive side 18, and an opening 20 therein to allow for viewing therethrough. The opening 20 is defined by a peripheral edge 21. The adhesive on the fabric layer adhesive side 16 may be a medical grade adhesive or similar. The dressing 10 may further include a reinforcement member 22 adhered to at least a portion of the fabric layer 12. The dressing 10 also includes a transparent film layer 24 closing the fabric layer opening 20 and having first and second opposing sides 26, 28 respectively. When the reinforcement member 22 is present, it may be disposed between the fabric layer 12 and the transparent film layer 24. Also, the reinforcement member 22 may be disposed between the peripheral edge 21 of the opening 20 and the fabric layer outer edge 14.
In the illustrated embodiment, the reinforcement layer 22 is generally of the same shape as the fabric layer 12, including a similar opening. The reinforcement layer 22 need not be of this configuration. The reinforcement member 22 may also have an adhesive side 34 and an opposite non-adhesive side 36, and the non-adhesive side 36 may be adhered to the fabric layer adhesive side 16.
The film layer first side 26 is non-adhesive and is mounted on part of the fabric layer adhesive side 16 as well as the reinforcement member adhesive side 34 (if present) to close the opening 20 in the fabric layer 12 and the opening in the reinforcement layer 22 (if present). The film layer second side 28 has a skin adhering adhesive portion 30 and an adhesive-free portion 32. The adhesive portion 30 may include a medical grade adhesive similar to the adhesive used for the fabric layer 12. The adhesive portion 30 partially overlaps the opening 20 such that the adhesive portion partially coincides with the opening. The adhesive-free portion 32 of the film layer 24 partially overlaps the opening 20 and extends partially within the opening and partially beyond the peripheral edge 21 of the opening. Hence, the adhesive-free portion 32 is disposed partially coincident with the opening 20 and extends laterally beyond the peripheral edge 21 of the opening 20 so as to be disposed partially outside of the opening 20 thereby partially overlapping the fabric layer 12. The film layer adhesive-free portion is adapted not to stick to skin, a wound, a connector, catheter, infusion needle, infusion needle safety guard, medical tubing, or the like disposed between the film layer adhesive-free portion and a patient's skin.
The adhesive-free portion 32 may have any shape and size that can surround the periphery of a catheter hub, connector fitting, infusion needle, safety guard, medical tubing, insertion site, wound, etc. covered by the dressing 10 so as to prevent damage or dislocation when the dressing is removed. In one embodiment shown in FIGS. 1 and 2, the adhesive-free portion 32 extends all the way to the fabric layer outer edge 14. In another embodiment shown in FIGS. 1A and 2A, the adhesive-free portion 32 extends beyond the peripheral edge 21 of the opening but may be disposed within the outer edge 14 of the fabric layer.
The film layer adhesive portion 30 may be located between the adhesive-free portion 32 and the outer edge 14 of the fabric layer 12. Essentially, the adhesive portion 30 and the adhesive-free portion 32 together cover the entire area of the second side 28 of the film layer 24.
The film layer 24 may generally either extend fully, or partially to the fabric layer edge 14. The reinforcement member 22 may be a continuous strengthening layer extending around a periphery of the dressing 10. Alternatively, the reinforcement member or members may be locally disposed about a portion or portions of the dressing, such as about tubing exits/recesses in the dressing. The reinforcement member 22 may be made of a netting material, a mesh, or other similar material with low elasticity properties. The reinforcement member 22 may also be disposed between the opening 20 and the fabric layer edge 14. It may alternatively be coincident with opening 20 and edge 14.
The dressing 10 may further include at least one recess 38 in the fabric layer edge 14 and the reinforcement member 22 may be disposed about or coincident with, the at least one recess 38. The recess 38 is sized to receive medical tubing in order to aid in securing medical tubing exiting from underneath the dressing 10, and reducing dressing edge peel. Optionally, the dressing 10 may also include an absorbent pad member (not shown) adhered to the adhesive portion 30 of the film layer 24. For example, the absorbent pad member may surround the opening 20. The absorbent pad member may absorb effluent from an insertion site disposed within the opening 20 when the dressing 10 is applied to a patient's skin.
The dressing 10 may also include a release liner 40 having a releasable side 42 contacting the film layer skin adhesive portion 30. The release liner 40 generally extends to the fabric layer edge 14. The releasable side 42 may be silicone coated or may have a similar coating. Optionally, the release liner 40 may include a first piece 44 and a second piece 46 that are folded such that each of the first and second pieces have a tab 48, 50 formed by the fold 52, 54. One of the pieces is releasable from the dressing without tampering with the other of the pieces. This allows for exposure of part of the film layer adhesive portion 30 for placement over tubings and apparatus and on part of the skin of a patient while the other part of the film layer adhesive portion remains covered so it cannot prematurely stick to the skin or to itself.
Turning next to FIG. 3, for purposes of example the dressing 10 is shown covering and protecting a Huber infusion needle and safety guard combination 56 inserted into an implanted port at an insertion site 58 on a patient. The dressing 10 is placed over the needle and safety guard 56 as well as the insertion site 58 and adhered to the patient's skin in such a way that the adhesive-free portion 30 is on top of the needle and safety guard 56 and insertion site 58. Hence, when the dressing 10 is removed, the dressing will not stick to the needle/safety guard 56 or the insertion site 58. It can also be seen that medical tubing 60 connected to the needle/safety guard 56 is covered by the dressing 10 proximate the needle/safety guard 56. Further, a portion of the tubing 60 exiting from underneath the dressing 10 is disposed in the dressing recess 38. The recess 38 thereby receives the tubing 60 and helps to secure the tubing. The reinforcement member 22 is also disposed about the tubing 60. If the tubing 60 is pulled in any direction (up, left, right, axially, etc.), the reinforcement member 22 receives some of the pulling force, distributes the pull force over a much larger adhesive skin contact area, and resists the peeling of the dressing 10 away from the patient's skin.
In a separate embodiment, the dressing may include more than one opening in the fabric layer. In this embodiment, the adhesive-free portion of the transparent film layer may be disposed partially within each opening and may extend beyond each opening. For example, the dressing may include two openings, and the adhesive-free portion may be disposed in both openings and may extend between and/or beyond both openings. The dressing may otherwise have features similar to the embodiment 10 described above.
Although the invention has been described by reference to specific embodiments, it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the described embodiments, but that it have the full scope defined by the language of the following claims.

## Claims

1. A self-adherent window dressing comprising:
a fabric layer bounded by an edge, said fabric layer having an adhesive side, an opposite non-adhesive side, and an opening therein to allow for viewing therethrough, said opening being defined by a peripheral edge; and
a transparent film layer closing said opening and having first and second opposing sides;
said film layer first side being non-adhesive and being mounted on said fabric layer adhesive side;
said film layer second side having a skin adhering adhesive portion and an adhesive-free portion, said adhesive-free portion overlaps said opening and extends partially within said opening and partially beyond said peripheral edge of said opening so as to partially overlap the fabric layer;
whereby said film layer adhesive-free portion is adapted not to stick to a patient's skin, a connector, a catheter, or other medical device disposed between said film layer adhesive-free portion and skin.

2. The window dressing of claim 1, wherein said adhesive-free portion extends to said fabric layer edge.

3. The window dressing of claim 1, including a reinforcement member adhered to at least a portion of said fabric layer, and being disposed between said fabric layer and said transparent film layer.

4. The window dressing of claim 1, wherein said film layer generally extends to said fabric layer edge.

5. The window dressing of claim 1, wherein said reinforcement member is a strengthening layer.

6. The window dressing of claim 1, wherein said reinforcement member is disposed between said opening peripheral edge and said fabric layer edge.

7. The window dressing of claim 1, wherein said reinforcement member is a netting material.

8. The window dressing of claim 1, including a release liner having a releasable side contacting said film layer skin adhesive portion, said release liner generally extending to said fabric layer edge.

9. The window dressing of claim 8, wherein said release liner includes a first piece and a second piece, said first and second pieces being folded such that each of said first and second pieces have a tab formed by the fold; whereby one of said pieces is releasable from said dressing without tampering with the other of said pieces.

10. A self-adherent window dressing comprising:
a fabric layer having an adhesive side, an opposite non-adhesive side, and an opening therein to allow for viewing therethrough; and
a transparent film layer closing said opening and having first and second opposing sides;
said film layer first side being non-adhesive and being mounted on said fabric layer adhesive side;
said film layer second side having a skin adhering adhesive portion and an adhesive-free portion, said adhesive-free portion partially in partially overlaps said opening and partially overlaps said fabric layer outside said opening;
whereby said film layer adhesive-free portion is adapted not to stick to a patient's skin, a connector, a catheter, or other medical device disposed between said film layer adhesive-free portion and skin.

11. The window dressing of claim 10, wherein said adhesive-free portion extends to an outer edge of said fabric layer.