DRESSING AND METHOD FOR APPLYING REDUCED PRESSURE TO AND COLLECTING AND STORING FLUID FROM A TISSUE SITE

• US 20090227969A1
• Filed: 03/05/2009
• Published: 09/10/2009
• Est. Priority Date: 03/05/2008
• Status: Active Grant

• Current Assignee: Solventum Intellectual Properties Company (Solventum Corp.)
• Original Assignee: KCI Licensing Incorporated (3M Company)
• Inventors: Tout, Aidan Marcus, Robinson, Timothy Mark, Locke, Christopher Brian, Jaeb, Jonathan Paul, Coulthard, Richard Daniel John
• Granted Patent: US 8,372,049 B2
• Time in Patent Office: Days
• US Class Current: 604/313
• CPC Class Codes: A61F 13/00063 comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00
• CPC Class Codes: A61F 13/00068 specially adapted for application or removal of fluid, e.g. irrigation or drainage of wounds, under-pressure wound-therapy A61F13/0216 takes precedence; drainage appliances for wounds in general A61M27/00
• CPC Class Codes: A61F 13/05 specially adapted for use with sub-pressure or over-pressure therapy, wound drainage or wound irrigation, e.g. for use with negative-pressure wound therapy [NPWT]
• CPC Class Codes: A61F 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00412 for use with needles, tubes or catheters
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/00544 form or structure
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/78 Means for preventing overflow or contamination of the pumping systems combined with drainage containers A61M1/60
• CPC Class Codes: A61M 1/784 by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves
• CPC Class Codes: A61M 1/912 Connectors between dressing and drainage tube
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/962 having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
• CPC Class Codes: A61M 1/964 having venting means on or near the dressing
• CPC Class Codes: A61M 1/966 having a pressure sensor on or near the dressing
• CPC Class Codes: A61M 1/985 the dressing itself forming the collection container
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2205/7536 allowing gas passage, but preventing liquid passage, e.g. liquophobic, hydrophobic, water-repellent membranes

Abstract

A reduced pressure treatment system includes a reduced pressure source and a reduced pressure dressing. The dressing includes an interface layer adapted to be positioned at a tissue site and an absorbent layer in fluid communication with the interface layer to absorb liquid from at least one of the interface layer and the tissue site. A diverter layer is positioned adjacent the absorbent layer, and the diverter layer includes a plurality of apertures in fluid communication with the absorbent layer to distribute a reduced pressure to the absorbent layer. A cover is positioned over the diverter layer to maintain the reduced pressure at the tissue site.

Claims

1. A reduced pressure treatment system comprising:

a reduced pressure source;

a dressing comprising;

an interface layer adapted to be positioned at a tissue site;

an absorbent layer in fluid communication with the interface layer to absorb liquid from at least one of the interface layer and the tissue site;

a diverter layer positioned between the absorbent layer and the reduced pressure source, the diverter layer including a plurality of apertures in fluid communication with the absorbent layer to distribute a reduced pressure to the absorbent layer; and

a cover positioned over the diverter layer to maintain the reduced pressure at the tissue site.

2. The reduced pressure treatment system of claim 1, wherein the interface layer is hydrophobic.

3. The reduced pressure treatment system of claim 1, wherein the absorbent layer includes a super absorbent fiber.

4. The reduced pressure treatment system of claim 1 further comprising a liquid-air separator positioned between the absorbent layer and the cover.

5. The reduced pressure treatment system of claim 1, wherein a surface area of the diverter layer is greater than a surface area of the cover.

6. The reduced pressure treatment system of claim 1 further comprising:

a liquid-air separator positioned between the absorbent layer and the cover;

wherein a surface area of the diverter layer is greater than a surface area of the cover; and

wherein at least a portion of the cover is adhesively coupled to the diverter layer and at least a portion of the diverter layer is coupled to a tissue surrounding the tissue site.

7. The reduced pressure treatment system of claim 6 further comprising a seal layer positioned between the diverter layer and the tissue surrounding the tissue site.

8. The reduced pressure treatment system of claim 1, wherein the reduced pressure source is a manually-actuated pump.

9. The reduced pressure treatment system of claim 1, wherein the apertures of the diverter layer are positioned near at least one perimeter edge of the diverter layer.

10. The reduced pressure treatment system of claim 1, wherein at least one of the apertures is larger than another of the apertures.

11. The reduced pressure treatment system of claim 1, wherein at least one of the apertures is configured to become smaller on contact with moisture.

12. The reduced pressure treatment system of claim 1, wherein the diverter layer includes a plurality of ridges on a surface of the diverter layer to define a plurality of channels between the ridges.

13. The reduced pressure treatment system of claim 1, wherein the diverter layer allows the absorption capabilities of the absorbent layer to be more fully utilized.

14. The reduced pressure treatment system of claim 1, wherein the diverter layer increases an amount of time over which the absorbent layer is capable of distributing reduced pressure.

15. The reduced pressure treatment system of claim 1, wherein the diverter layer is gas permeable.

16-20. -20. (canceled)

21. A reduced pressure dressing adapted to distribute a reduced pressure to a tissue site, the dressing comprising:

an interface layer adapted to be positioned at the tissue site;

an absorbent layer in fluid communication with the interface layer to absorb liquid from at least one of the interface layer and the tissue site;

a diverter layer adjacent the absorbent layer, the diverter layer formed from a substantially gas-impermeable material, the diverter layer including a plurality of apertures in fluid communication with the absorbent layer to increase an amount of time that the absorbent layer is able to distribute reduced pressure; and

a cover positioned over the diverter layer to maintain the reduced pressure at the tissue site.

22-34. -34. (canceled)

35. A reduced pressure dressing adapted to distribute a reduced pressure to a tissue site, the dressing comprising:

an interface layer adapted to be positioned at the tissue site;

a first manifold layer positioned in fluid communication with the interface layer to distribute the reduced pressure to the interface layer;

an absorbent layer in fluid communication with the first manifold layer to absorb liquid from at least one of the first manifold layer, the interface layer, and the tissue site;

a diverter layer positioned adjacent the absorbent layer, the diverter layer formed from a substantially gas-impermeable material, the diverter layer including a plurality of spaced apertures in fluid communication with the absorbent layer;

a second manifold layer in fluid communication with the diverter layer to distribute the reduced pressure to the diverter layer;

a cover to maintain the reduced pressure at the tissue site, the cover having an aperture through which the reduced pressure is adapted to be delivered to the dressing; and

a liquid-air separator positioned between the second manifold and the cover to inhibit liquid from exiting the dressing.

36. The reduced pressure dressing of claim 35, wherein the interface layer is hydrophobic.

37. The reduced pressure dressing of claim 35, wherein the absorbent layer includes a super absorbent fiber.

38. The reduced pressure dressing of claim 35 further comprising a seal layer positioned between a tissue surrounding the tissue site and at least one other layer to assist in maintaining reduced pressure in the dressing.

39. The reduced pressure dressing of claim 35, wherein a surface area of the diverter layer is greater than a surface area of the cover.

40. The reduced pressure dressing of claim 35, wherein:

a surface area of the diverter layer is greater than a surface area of the cover; and

at least a portion of the cover is adhesively coupled to the diverter layer and at least a portion of the diverter layer is coupled to a tissue surrounding the tissue site.

41. The reduced pressure dressing of claim 40 further comprising a seal layer positioned between the diverter layer and the tissue surrounding the tissue site.

42. The reduced pressure dressing of claim 35, wherein the apertures of the diverter layer are positioned near at least one perimeter edge of the diverter layer.

43. The reduced pressure dressing of claim 35, wherein the apertures are holes.

44. The reduced pressure dressing of claim 35, wherein at least one of the apertures is larger than another of the apertures.

45. The reduced pressure dressing of claim 35, wherein at least one of the apertures is configured to become smaller on contact with moisture.

46. The reduced pressure dressing of claim 35, wherein the diverter layer includes a plurality of ridges on a surface of the diverter layer to define a plurality of channels between the ridges.

47. The reduced pressure dressing of claim 35, wherein the diverter layer allows the absorption capabilities of the absorbent layer to be more fully utilized.

48. The reduced pressure dressing of claim 35, wherein the diverter layer increases an amount of time over which the absorbent layer is capable of distributing reduced pressure.

49-58. -58. (canceled)

59. A reduced pressure dressing adapted to distribute a reduced pressure to a tissue site, the dressing comprising:

an interface layer adapted to be positioned at the tissue site;

an absorbent layer in fluid communication with the interface layer to absorb liquid from at least one of the interface layer and the tissue site;

a diverter layer adjacent the absorbent layer, the diverter layer formed from a substantially gas-impermeable material, the diverter layer having a surface area smaller than a surface area of the absorbent layer such that flow is directed around at least one perimeter edge of the diverter layer; and

a cover positioned over the diverter layer to maintain the reduced pressure at the tissue site.

60. The reduced pressure dressing of claim 59, wherein the interface layer is hydrophobic.

61. The reduced pressure dressing of claim 59, wherein the absorbent layer includes a super absorbent fiber.

62. The reduced pressure dressing of claim 59 further comprising a liquid-air separator positioned between the absorbent layer and the cover.

63. The reduced pressure dressing of claim 59 further comprising a seal layer positioned between the cover and tissue surrounding the tissue site.

64. The reduced pressure dressing of claim 59, wherein the diverter layer allows the absorption capabilities of the absorbent layer to be more fully utilized.

65. The reduced pressure dressing of claim 59, wherein the diverter layer increases an absorption efficiency of the absorbent layer.

66. (canceled)