CN-122003219-A - Sealing strip

Abstract

The present invention provides a sealing strip for negative pressure wound therapy comprising a carrier layer comprising a front side and a back side, a protective liner on the back side of the carrier layer, an adhesive layer on the front side of the carrier layer, a first release liner on a first portion of the adhesive layer, a second release liner on a second portion of the adhesive layer and extending to one lateral edge of the adhesive layer, wherein each of the first and second release liners comprises a portion detachably adhered to the adhesive layer and at least one operating tab portion not adhered to the adhesive layer, and wherein the surface area of the operating tab portion or the combined surface area of the operating tab portion of the first release liner is at least 45% of the total surface area of the first release liner.

Inventors

• N. BROWN
• L. DAVIS
• B. Gaskel
• A. Ide
• D. Keith Tiven
• L. Bashi

Assignees

• 康沃特克有限公司

Dates

Publication Date

20260508

Application Date

20241017

Priority Date

20231207

Claims (20)

1. 1. A sealing strip for negative pressure wound therapy, the sealing strip comprising: A carrier layer comprising a front side and a back side; a protective liner on the back side of the carrier layer; an adhesive layer on the front side of the carrier layer; A first release liner on a first portion of the adhesive layer; A second release liner on a second portion of the adhesive layer, the second release liner extending to one lateral edge of the adhesive layer; wherein each of the first and second release liners includes a portion detachably adhered to the adhesive layer and at least one handling tab portion not adhered to the adhesive layer; wherein the surface area of the operative tab portions or the combined surface area of the operative tab portions of the first release liner is at least 45% of the total surface area of the first release liner.
2. 2. The sealing strip of claim 1, wherein the first release liner extends to one lateral edge of the adhesive layer and the second release liner extends to an opposite lateral edge of the adhesive layer.
3. 3. The sealing strip according to claim 1 or 2, wherein the portion of the first release liner detachably adhered to the adhesive layer covers no more than 45% of the area of the sealing strip, such as no more than 30% of the area of the sealing strip.
4. 4. The sealing strip according to any of the preceding claims, wherein the sealing strip comprises: A first release liner on a central portion of the adhesive layer; at least one second release liner on a second portion of the adhesive layer, the at least one second release liner extending to one lateral edge of the adhesive layer; At least one third release liner on a third portion of the adhesive layer, the at least one third release liner extending to a lateral edge of the adhesive layer opposite the second release liner, and Wherein the first, second and third release liners each comprise a portion that is detachably adhered to the adhesive layer and at least one handling tab portion that is not adhered to the adhesive layer.
5. 5. The sealing strip of claim 4, wherein the portion of the first release liner detachably adhered to the adhesive layer covers no more than 30% of the area of the sealing strip, such as no more than 27% of the area of the sealing strip.
6. 6. The sealing tape of any of the preceding claims, wherein each release liner does not overlap on the adhesive layer.
7. 7. The sealing strip of any of the preceding claims, wherein the surface area of the handling tab portion of the first release liner is at least 50% of the total surface area of the first release liner.
8. 8. A sealing strip as claimed in any preceding claim, wherein each release liner is a paper release liner.
9. 9. The sealing strip of any of the preceding claims, wherein the surface area of the operative tab portion of each second release liner is at least 18% of the total surface area of the second release liner and/or the surface area of the operative tab portion of each third release liner is at least 18% of the total surface area of the third release liner.
10. 10. The sealing strip according to any one of the preceding claims, wherein the protective liner comprises a portion in contact with the back surface of the carrier layer and at least one handling tab portion at one or both ends.
11. 11. The sealing strip of claim 10, wherein the at least one operative tab portion of the protective liner comprises at least a portion that extends beyond at least a portion of the first lateral edge of the carrier layer and/or the second lateral edge of the carrier layer.
12. 12. The sealing strip of claim 10 or 11, wherein the handling tab portion of the protective liner comprises at least one perforated line or region.
13. 13. The sealing strip of any of claims 10-12, wherein a total surface area of the handling tab portion of the protective liner is at least 18% of a total surface area of the protective liner.
14. 14. The sealing tape of any of the preceding claims, wherein the adhesive layer comprises a solvent-free acrylic adhesive.
15. 15. The sealing tape of any of the preceding claims, wherein the adhesive layer has a weight of no more than 30 gsm, or no more than 25 gsm.
16. 16. The sealing tape of any of the preceding claims, wherein the weight of the carrier layer is in the range of 20 gsm to 35 gsm.
17. 17. A negative pressure wound therapy kit comprising a negative pressure wound therapy dressing and at least one sealing strip according to any one of claims 1 to 16.
18. 18. A negative pressure wound treatment apparatus comprising a wound dressing, a negative pressure source, and at least one sealing strip, wherein the sealing strip is according to any one of claims 1 to 16, wherein the negative pressure source is removably connected to the wound dressing.
19. 19. The negative pressure wound therapy apparatus of claim 18, wherein the apparatus comprises at least 2 sealing strips, at least 4 sealing strips, or at least 6 sealing strips.
20. 20. The negative pressure wound therapy apparatus of claim 18 or 19, wherein the negative pressure source is removably connected to the wound dressing by a connector, conduit or tubing.

Description

Sealing strip Technical Field The present invention relates to a sealing strip for a negative pressure wound dressing and a negative pressure wound therapy kit comprising at least one sealing strip. Background Negative Pressure Wound Therapy (NPWT) is a wound dressing system in which negative/sub-atmospheric pressure is applied intermittently or continuously to a wound site. NPWT can be used for acute or chronic wounds and is beneficial to patients because it can lead to faster healing and reduced likelihood of infection. Typically, negative pressure wound therapy dressings are secured to the patient's skin by an adhesive surface on the dressing. Additional sealing tape may then be applied to the edge of the wound dressing to ensure a tight seal is formed so that sub-atmospheric pressure may be successfully applied to the wound without significant air leakage. Frequent handling of some or all of the NPWT dressing may introduce bacteria into the wound, resulting in infection, and therefore, to avoid having to change the sealing strip or the entire NPWT dressing frequently, it is advantageous to provide a sealing strip with increased wear time. Improved wear time can be obtained by high adhesion, but high adhesion may also result in the removal of the sealing strip being painful when it is necessary to remove or replace the sealing strip in order to, for example, inspect a wound or replace the dressing with a clean dressing. It would therefore be advantageous to provide a sealing strip with improved adhesion to increase wear time without requiring excessive force to remove the sealing strip or causing pain to the patient when removal of the sealing strip is desired. The sealing strip requires a high Moisture Vapor Transfer Rate (MVTR) so that moisture can be removed from the skin and is not trapped between the sealing strip and the skin. The trapped moisture can negatively affect the adhesion of the sealing strip and result in maceration of the skin surrounding the wound. MVTR may be improved with thinner sealing strips, but thinner sealing strips may be more difficult to apply. If the sealing strip is difficult to apply, it may pucker or fold upon application, so there is not as long a wear time, and the likelihood of the sealing strip becoming detached from the wound dressing and skin during wear increases. It would therefore be advantageous to provide a sealing strip having both improved MVTR and improved operability and thus improved wear time. The ease of application of the sealing strip is critical for smooth application of the sealing strip, which in turn results in long wear times. In use, a clinician will apply the sealing strip to a patient with a glove and may encounter problems such as the sealing strip adhering to itself, making it unusable, or the difficulty in removing the peel-off layer or protective liner that is required to maintain a sterile environment for the sealing strip surface. It would therefore be advantageous to provide a sealing strip that is easy to apply to a patient, which may improve the wear time of the patient. It is an aim of embodiments of the present invention to overcome one or more of the problems of the prior art, whether or not explicitly disclosed herein. Disclosure of Invention According to a first aspect of the present invention there is provided a sealing strip for negative pressure wound therapy, the sealing strip comprising: A carrier layer comprising a front side and a back side; A protective liner on the back side of the carrier layer; an adhesive layer on the front side of the carrier layer; A first release liner on a first portion of the adhesive layer; a second release liner on a second portion of the adhesive layer, the second release liner extending to one lateral edge of the adhesive layer; wherein each of the first and second release liners includes a portion detachably adhered to the adhesive layer and at least one handling tab portion not adhered to the adhesive layer; And wherein the surface area of the operative tab portion or the combined surface area of the operative tab portions of the first release liner is at least 45% of the total surface area of the first release liner. The sealing strip may comprise opposite longitudinal edges and opposite lateral edges. The sealing strip may be substantially rectangular. The adhesive layer, the carrier layer, the protective liner, and the first and second release liners may include opposing longitudinal edges and opposing lateral edges. The adhesive layer, the carrier layer, the protective liner, and the first and second release layers may be substantially rectangular. The adhesive layer, the carrier layer, the protective liner, and the first and second release layers may be substantially rectangular, including opposing longitudinal edges and opposing lateral edges, wherein the longitudinal edges are longer than the lateral edges. In some embodiments, the adhesive layer includes a back side connected to the