CN-122028885-A - Sealing strip

Abstract

The present invention provides a sealing strip for a negative pressure wound dressing comprising, in order, a carrier layer having opposite front and back sides, an adhesive layer covering at least a portion of the front side of the carrier layer, and wherein the adhesive layer comprises an acrylic adhesive, and at least one release liner detachably connected to the adhesive layer, wherein the weight of the adhesive layer does not exceed 33 gsm, and wherein the weight of the carrier layer is in the range of 20 gsm to 35 gsm.

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

20260512

Application Date

20241017

Priority Date

20231207

Claims (19)

1. 1. A sealing strip for a negative pressure wound dressing, the sealing strip comprising in sequence: a carrier layer having opposite front and back sides; An adhesive layer covering at least a portion of the front side of the carrier layer, wherein the adhesive layer comprises an acrylic adhesive, and At least one release liner detachably connected to the adhesive layer; Wherein the weight of the adhesive layer is no more than 33 gsm, wherein the weight of the carrier layer is in the range of 20: 20 gsm to 35: 35 gsm.
2. 2. The sealing tape of claim 1, wherein the adhesive layer has a weight of no more than 30 gsm, or no more than 25 gsm.
3. 3. The sealing strip of claim 1 or 2, wherein the carrier layer comprises a polymeric material.
4. 4. The sealing tape of any of the preceding claims, wherein the carrier layer comprises polyurethane.
5. 5. The sealing tape of any of the preceding claims, wherein the carrier layer is transparent or translucent.
6. 6. The sealing tape of any of the preceding claims, wherein the adhesive layer is a substantially solvent-free adhesive layer.
7. 7. The sealing tape of any of the preceding claims, wherein the adhesive comprises no more than 20wt.% solvent.
8. 8. The sealing tape of any of the preceding claims, wherein the adhesive layer covers the entire front face of the carrier layer.
9. 9. The sealing tape of any of the preceding claims, wherein at least one release liner is detachably adhered to the adhesive layer.
10. 10. A sealing strip according to claim 9, wherein the or each release liner is a paper release liner.
11. 11. A sealing strip as claimed in claim 9 or 10, wherein the or each release liner is a siliconized paper release liner.
12. 12. A sealing tape according to any preceding claim, wherein the or each release liner has a weight in the range 60 gsm to 70 gsm.
13. 13. A sealing tape according to any preceding claim, wherein the or a portion of each release liner comprises an operating tab formed by a portion of the release liner not connected to the adhesive layer.
14. 14. 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 13.
15. 15. The negative pressure wound therapy kit of claim 14, wherein the negative pressure wound therapy kit comprises at least 2 sealing strips.
16. 16. The negative pressure wound therapy kit of claim 14 or 15, wherein the negative pressure wound therapy kit comprises at least 4 sealing strips or at least 6 sealing strips.
17. 17. A negative pressure wound therapy apparatus comprising a negative pressure wound therapy dressing, a negative pressure source, and at least one sealing strip according to any one of claims 1 to 13, wherein the negative pressure source is removably connected to the wound dressing.
18. 18. The negative pressure wound therapy apparatus of claim 17, wherein the negative pressure source is removably connected to the wound dressing by a connector.
19. 19. The negative pressure wound therapy apparatus of claim 17 or 18, wherein the negative pressure source is removably connected to the wound dressing by a 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 may increase. It would therefore be advantageous to provide a sealing strip having both improved MVTR and improved operability and thus improved wear time. 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 a negative pressure wound dressing, the sealing strip comprising in sequence a carrier layer having opposed front and back sides, an adhesive layer covering at least a portion of the front side of the carrier layer, wherein the adhesive layer comprises an acrylic adhesive, and at least one release liner detachably connected to the adhesive layer, wherein the weight of the adhesive layer does not exceed 33 gsm (grams per square meter), and wherein the weight of the carrier layer is in the range 20 gsm to 35 gsm. The sealing tape of the present invention may be advantageous because an adhesive layer having a weight of no more than 33 gsm and a carrier layer having a weight in the range of 20 gsm to 35 gsm results in a good moisture transfer rate because moisture has a short travel distance. The sealing strip may also be advantageous because it is easy to apply to the skin without wrinkling or folding, resulting in a longer wear time. The adhesive layer may have a weight of no more than 32 gsm, no more than 31 gsm, no more than 30 gsm, no more than 29 gsm, no more than 28 gsm, no more than 27 gsm, no more than 26 gsm, no more than 25 gsm, no more than 24 gsm, no more than 23 gsm, no more than 22 gsm, no more than 20 gsm, no more than 18 gsm, no more than 16 gsm, or no more than 15 gsm. This embodiment may be advantageous because a light weight, thin adhesive layer results in an improved moisture transfer rate such that moisture is successfully removed from the skin and is not trapped between the skin and the adhesive layer, which may have a negative impact on the adhesion of the sealing strip. The acrylic adhesive may contain no more than 20wt.% solvent. The acrylic adhesive may comprise no more than 18 wt%, no more than 15 wt%, no more than 12 wt%, no more than 10 wt%, no more than 8wt.%, or no more than 5wt% solvent. In some embodiments, the adhesive layer is a substantially solvent-free adhesive layer. This embodiment may be advantageous because it is more environmentally friendly due to the low concentration of volatile organic compounds. The acrylic binder may be selected from ethyl acrylate, butyl acrylate, and methyl acrylate, or any combination thereof. The acrylic adhesive may be made from a