Foam/film composite medical articles

• US 6,548,727 B1
• Filed: 02/17/2000
• Issued: 04/15/2003
• Est. Priority Date: 02/17/2000
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Swenson, Mary M.
• Primary Examiner(s): Lucchesi, Nicholas D.
• Assistant Examiner(s): Hamilton, Lalita M.
• Application Number:
  US09/507,107
• Time in Patent Office: 1,153 Days
• Field of Search: 602/41-48, 602/52, 602/56
• US Class Current: 602/41
• CPC Class Codes: A61L 15/26 Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof A61L15/225 takes precedence
• CPC Class Codes: A61L 15/425 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: C08L 75/04 Polyurethanes

Abstract

The present invention provides medical articles, such as wound dressings. In one embodiment, the medical article includes a backing, an absorbent foam, and a fibrous adhesive disposed between the backing and the absorbent foam, wherein the backing includes a liquid-impervious, moisture-vapor permeable polymeric film. In another embodiment, the medical article includes a backing, an absorbent, substantially nonswellable foam, and an adhesive disposed therebetween. In yet another embodiment, the medical article includes a backing, a foam, and a fibrous adhesive disposed therebetween.

Claims

1. A medical article comprising a backing, an absorbent foam, and a fibrous adhesive disposed between the backing and the absorbent foam, wherein the backing comprises a liquid-impervious, moisture-vapor permeable polymeric film, and wherein the foam absorbs greater than 250 wt-% aqueous saline solution when immersed in phosphate buffered saline containing 0.9 wt-% NaCl at 37°

C. for 30 minutes.

2. The medical article of claim 1 which has a dry MVTR of less than about 2000 g/m²/24 hours and a wet MVTR of at least about 3000 g/m²/24 hours at 38°

C. and 20% relative humidity.

3. The medical article of claim 2 which has a wet MVTR of at least about 5000 g/m²/24 hours at 38°

C. and 20% relative humidity.

4. The medical article of claim 3 which has a wet MVTR of at least about 7500 g/m²/24 hours at 38°

C. and 20% relative humidity.

5. The medical article of claim 4 which has a wet MVTR of at least about 10,000 g/m²/24 hours at 38°

C. and 20% relative humidity.

6. The medical article of claim 2 which has a dry MVTR of less than about 1800 g/m²/24 hours at 38°

C. and 20% relative humidity.

7. The medical article of claim 6 which has a dry MVTR of less than about 1500 g/m²/24 hours at 38°

C. and 20% relative humidity.

8. The medical article of claim 1 wherein the liquid-impervious, moisture-vapor permeable polymeric film has a dry MVTR of at least about 300 g/m²/24 hours at 38°

C. and 20% relative humidity.

9. The medical article of claim 8 wherein the liquid-impervious, moisture-vapor permeable polymeric film has a wet MVTR of at least about 3000 g/m²/24 hours at 38°

C. and 20% relative humidity.

10. The medical article of claim 1 wherein the liquid-impervious, moisture-vapor permeable polymeric film comprises one or more layers.

11. The medical article of claim 1 wherein the liquid-impervious, moisture-vapor permeable polymeric film is a thermoplastic polyurethane.

12. The medical article of claim 1 wherein the liquid-impervious, moisture-vapor permeable polymeric film has a thickness of about 10 microns to about 250 microns.

13. The medical article of claim 1 wherein the absorbent foam is an open cell foam.

14. The medical article of claim 1 wherein the absorbent foam comprises a polyurethane.

15. The medical article of claim 1 wherein the liquid-impervious, moisture-vapor permeable polymeric film includes graphics printed thereon.

16. The medical article of claim 1 wherein the backing further comprises a nonwoven web.

17. The medical article of claim 16 wherein the moisture-vapor polymeric film is disposed between the nonwoven web and the foam.

18. The medical article of claim 16 wherein the nonwoven web is disposed between the moisture-vapor polymeric film and the foam.

19. The medical article of claim 16 wherein the moisture-vapor polymeric film is bonded to the nonwoven web with a fibrous adhesive.

20. The medical article of claim 19 wherein the fibrous adhesive comprises a polyacrylate.

21. The medical article of claim 16 wherein the moisture-vapor polymeric film is thermomechanically bonded to the nonwoven web.

22. The medical article of claim 1 wherein the fibrous adhesive comprises a polyacrylate.

23. The medical article of claim 1 wherein the liquid-impervious, moisture-vapor permeable polymeric film and foam are not coextensive.

24. The medical article of claim 23 wherein the liquid-impervious, moisture-vapor permeable polymeric film includes an adhesive disposed on the surface to which the foam is bonded and around the periphery of the foam.

25. A medical article comprising a backing, an absorbent, substantially nonswellable foam, and a fibrous adhesive disposed between the backing and the absorbent foam, wherein the backing comprises a liquid-impervious, moisture-vapor permeable polymeric film, and wherein the substantially nonswellable foam increases in volume by no greater than about 10% following a 30-minute soaking in phosphate buffered saline at 37°

C.

26. A medical article comprising a backing, an absorbent, substantially nonswellable foam, and a fibrous adhesive disposed between the backing and the absorbent foam, wherein the backing comprises a liquid-impervious, moisture-vapor permeable polymeric film, and wherein the substantially nonswellable foam increases in volume by no greater than about 5% following a 30-minute soaking in phosphate buffered saline at 37°

C.

27. A medical article comprising a backing, an absorbent, substantially nonswellable foam, and an adhesive disposed therebetween, wherein the foam absorbs greater than 250 wt-% aqueous saline solution when immersed in phosphate buffered saline containing 0.9 wt-% NaCl at 37°

C. for 30 minutes.

28. The medical article of claim 27 wherein the backing comprises a liquid-impervious, moisture-vapor permeable polymeric film.

29. The medical article of claim 27 wherein the adhesive is a fibrous adhesive.

30. The medical article of claim 27 wherein the adhesive forms a continuous layer.

31. The medical article of claim 27 wherein the adhesive forms a pattern-coated layer.

32. A medical article comprising a backing, an absorbent, substantially nonswellable foam, and an adhesive disposed therebetween, wherein the substantially nonswellable foam increases in volume by no greater than about 10% following a 30-minute soaking in phosphate buffered saline at 37°

C.

33. A medical article comprising a backing, a foam, and a fibrous adhesive disposed therebetween, wherein the foam absorbs greater than 250 wt-% aqueous saline solution when immersed in phosphate buffered saline containing 0.9 wt-% NaCl at 37°

C. for 30 minutes.

34. The medical article of claim 33 wherein the fibrous adhesive comprises a polyacrylate.

35. The medical article of claim 33 wherein the backing further comprises a nonwoven web.

36. The medical article of claim 33 wherein the medical article has a dry MVTR of less than about 2000 g/m²/24 hours and a wet MVTR of at least about 3000 g/m²/24 hours at 38°

C. and 20% relative humidity.

37. A medical article comprising a backing, a foam, and a fibrous adhesive disposed therebetween, wherein the foam increases in volume by no greater than about 10% following a 30-minute soaking in phosphate buffered saline at 37°

C.

38. The medical article of claim 37 wherein the backing comprises a liquid-impervious, moisture-vapor permeable polymeric film.

39. The medical article of claim 38 wherein the liquid-impervious, moisture-vapor permeable polymeric film and foam are not coextensive.

40. The medical article of claim 37 which has a dry MVTR of less than about 2000 g/m²/24 hours and a wet MVTR of at least about 3000 g/m²/24 hours at 38°

C. and 20% relative humidity.

41. The medical article of claim 37 wherein the backing further comprises a nonwoven web.

42. The medical article of claim 37 wherein the fibrous adhesive comprises a polyacrylate.