Hydrogels with release element

• US 9,457,123 B2
• Filed: 09/23/2009
• Issued: 10/04/2016
• Est. Priority Date: 09/24/2008
• Status: Active Grant

• Current Assignee: Solventum Intellectual Properties Company (Solventum Corp.)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Holm, David R., Burton, Scott A., Asmus, Robert A., Jacobson, Richard L.
• Primary Examiner(s): AHMED, HASAN SYED
• Application Number:
  US13/119,225
• Publication Number:
  US 20110166492A1
• Time in Patent Office: 2,568 Days
• US Class Current: 1/1
• CPC Class Codes: A61F 13/0256 characterized by the parametric properties of the adhesive
• CPC Class Codes: A61F 2013/00753 superabsorbent fabric of cloth
• CPC Class Codes: A61L 15/46 Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: A61L 2300/404 Biocides, antimicrobial agents, antiseptic agents
• CPC Class Codes: A61L 2300/602 Type of release, e.g. controlled, sustained, slow

Abstract

An adhesive hydrogel dressing as well as methods of applying the dressing to a patient. The dressing generally comprises an adhesive hydrogel pad, a backing layer, and an adhesive layer on the backing layer facing the hydrogel pad. The adhesive layer and backing layer form a perimeter around the hydrogel pad and hold the hydrogel pad in place on an application surface. A release element is in contact with at least a portion of the edge of the hydrogel pad proximate the area that the hydrogel pad and release liner separate during liner removal.

Claims

1. An island dressing comprising

a backing that comprises a first major surface;

adhesive located on the first major surface of the backing;

a release liner in contact with a portion of the adhesive on the first major surface of the backing;

a hydrogel island pad positioned between the first major surface of the backing and the release liner; and

two release elements separated from each other on the hydrogel island pad, wherein each release element is positioned along a portion of a periphery of the hydrogel island pad, wherein at least a portion of each release element is sandwiched between the hydrogel island pad and the release liner;

wherein the release liner contacts a portion of the hydrogel island pad between the two release elements.

2. The island dressing of claim 1, wherein the release element contacts at least a portion of the backing.

3. The island dressing of claim 1, wherein the release element contacts at least a portion of the backing and is attached to at least a portion of the backing.

4. The island dressing of claim 1, wherein the release element comprises a layer of adhesive on the skin facing surface of the release element that exhibits less tack than the adhesive located on the first major surface of the backing.

5. The island dressing of claim 1, wherein the hydrogel island pad is attached to the adhesive on the first major surface of the backing.

6. The island dressing of claim 1, further comprising a carrier releasably attached to a second major surface of the backing.

7. The island dressing of claim 1, further comprising an adhesive laminate applied to at least a portion of the adhesive on the first major surface of the backing, wherein the release liner covers the adhesive, the hydrogel island pad, and the adhesive laminate.

8. The island dressing of claim 1, wherein the average maximum peel force to initiate separation of an one-inch wide hydrogel pad and a release liner without the release element is at least 25% greater than the average maximum peel force of the hydrogel pad and the release liner with a release element, when measured by the T-peel Test Method performed after conditioning the island dressing for one week at 50°

C.

9. The island dressing of claim 1, wherein the hydrogel pad comprises less than 45% water.

10. The island dressing of claim 1, wherein the release element is comprised of a polymer film, a porous non-woven fabric, or a porous knitted fabric.

11. The island dressing of claim 1, further comprising an antimicrobial agent.

12. The island dressing of claim 1, wherein each release element is a strip.

13. The island dressing of claim 1, wherein the hydrogel comprises

a first polymer comprising a cross-linked poly (N-vinyl) lactam;

a swelling agent; and

a second modifying polymer swellable in the swelling agent;

wherein the first polymer forms a pressure sensitive adhesive in the presence of the swelling agent; and

wherein the second modifying polymer and the swelling agent reduce the adhesiveness of the first polymer while at least maintaining the cohesion of the composition.

14. The island dressing of claim 13 wherein the poly (N-vinyl)lactam is selected from the group consisting of poly N-vinyl-2-pyrrolidone, poly N-vinyl-2-valerolactam, poly N-vinyl-2-caprolactam, and combinations thereof.

15. The island dressing of claim 13 wherein the swelling agent is selected from the group consisting of monohydric alcohols, polyhydric alcohols, glycerol, polyglycerols, sorbitol, polyhydric alcohol ethoxylates, methoxides of polyethylene glycol, methoxides of polyhydric alcohol ethoxylates, and combinations thereof.

16. The island dressing of claim 13 wherein the second modifying polymer comprises at least one of a polysaccharide, polysaccharide derivatives, acrylate, acrylate derivatives, cellulose, cellulose

derivatives, and combinations thereof.

17. The island dressing of claim 13 wherein the second modifying polymer is selected from the group consisting of hydroxypropyl guar, guar gum, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, polymeric quaternary ammonium salt of hydroxyethyl cellulose reacted with trialkyl ammonium substituted epoxide, copolymers of hydroxyethyl cellulose and diallyldimethyl ammonium chloride, and derivatives and combinations thereof.

18. The island dressing of claim 17 wherein first polymer is poly N-vinyl-2-pyrrolidone, the swelling agent is triglycerol and the antimicrobial agent is chlorhexidine gluconate.