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

• US 20100305490A1
• Filed: 06/28/2010
• Published: 12/02/2010
• 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, Alden Marcus, Locke, Christopher Drian, Robinson, Timothy Mark, Coulthard, Richard Daniel John
• Granted Patent: US 8,449,508 B2
• Time in Patent Office: Days
• US Class Current: 602/43
• CPC Class Codes: A61F 13/0206 with absorbent fibrous layers, e.g. woven or non-woven absorbent pads or island dressings
• CPC Class Codes: A61F 13/0209 comprising superabsorbent material
• CPC Class Codes: A61F 13/022 having more than one layer with different fluid retention characteristics
• 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: 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 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 1/985 the dressing itself forming the collection container
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/582 by tactile feedback
• CPC Class Codes: A61M 2205/584 having a color code

Abstract

A reduced pressure dressing for applying reduced pressure treatment to a tissue site includes an interface layer adapted to be positioned at the tissue site. An absorbent layer is in fluid communication with the interface layer to absorb liquid from at least one of the interface layer and the tissue site. A non-motor-driven pump is in fluid communication with the absorbent layer to deliver a reduced pressure to the tissue site. A cover is positioned over the non-motor-driven pump, the absorbent layer, and the interface layer to maintain the reduced pressure at the tissue site, and a liquid-air separator is positioned between the absorbent layer and the non-motor-driven pump to inhibit liquid from entering the non-motor-driven pump.

Claims

1. A reduced pressure dressing for applying reduced pressure treatment to a tissue site, the reduced pressure 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 non-motor-driven pump in fluid communication with the absorbent layer to deliver a reduced pressure to the tissue site;

a cover positioned over the non-motor-driven pump, the absorbent layer, and the interface layer to maintain the reduced pressure at the tissue site; and

a liquid-air separator positioned between the absorbent layer and the non-motor-driven pump to inhibit liquid from entering the non-motor-driven pump.

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

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

4. The reduced pressure dressing of claim 1 further comprising a seal layer positioned between the cover and tissue at or near the tissue site.

5. The reduced pressure dressing of claim 1, wherein the non-motor-driven pump is a piezoelectric-driven pump.

6. The reduced pressure dressing of claim 1 further comprising a battery and control electronics positioned within the dressing and operatively connected to the non-motor-driven pump.

7. The reduced pressure dressing of claim 1 further comprising an aperture in the cover to allow exhausting of gas from the non-motor-driven pump.

8. The reduced pressure dressing of claim 1 further comprising an odor filter in fluid communication with an outlet port of the non-motor-driven pump.

9. A reduced pressure dressing for applying reduced pressure treatment to a tissue site, the reduced pressure 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 non-motor-driven pump in fluid communication with the absorbent layer to deliver a reduced pressure to the tissue site;

a diverter layer between the absorbent layer and the non-motor-driven pump, the diverter layer including a plurality of apertures to transmit the reduced pressure from the non-motor-driven pump to the absorbent layer;

a cover positioned over the non-motor-driven pump, the diverter layer, the absorbent layer, and the interface layer to maintain the reduced pressure at the tissue site; and

a liquid-air separator positioned between the diverter layer and the non-motor-driven pump to inhibit liquid from entering the non-motor-driven pump.

10. The reduced pressure dressing of claim 9, wherein the interface layer is hydrophobic.

11. The reduced pressure dressing of claim 9, wherein the absorbent layer includes a super absorbent fiber.

12. The reduced pressure dressing of claim 9, wherein a surface area of the diverter layer is greater than a surface area of the cover.

13. The reduced pressure dressing of claim 9, 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.

14. The reduced pressure dressing of claim 13 further comprising a seal layer positioned between the diverter layer and the tissue surrounding the tissue site.

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

16. The reduced pressure dressing of claim 9, wherein at least one of the apertures is larger than another of the apertures.

17. The reduced pressure dressing of claim 9, wherein at least one of the apertures is configured to become smaller on contact with moisture.

18. The reduced pressure dressing of claim 9, 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.

19. The reduced pressure dressing of claim 9, wherein the diverter layer allows the absorption capabilities of the absorbent layer to be more fully utilized.

20. The reduced pressure dressing of claim 9, wherein the diverter layer increases an amount of time over which the absorbent layer is capable of distributing reduced pressure.

21. The reduced pressure dressing of claim 9, wherein the diverter layer is gas permeable.

22. The reduced pressure dressing of claim 9, wherein the non-motor-driven pump is a piezoelectric-driven pump.

23. The reduced pressure dressing of claim 9 further comprising a battery and control electronics positioned within the dressing and operatively connected to the non-motor-driven pump.

24. The reduced pressure dressing of claim 9 further comprising an aperture in the cover to allow exhausting of gas from the non-motor-driven pump.

25. The reduced pressure dressing of claim 9 further comprising an odor filter in fluid communication with an outlet port of the non-motor-driven pump.

26. A reduced pressure dressing for applying reduced pressure treatment to a tissue site the reduced pressure 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;

a non-motor-driven pump in fluid communication with the plurality of apertures of the diverter layer to deliver a reduced pressure to the tissue site;

a cover positioned over the non-motor-driven pump, the diverter layer, the absorbent layer, and the interface layer to maintain the reduced pressure at the tissue site; and

a liquid-air separator positioned between the diverter layer and the non-motor-driven pump to inhibit liquid from entering the non-motor-driven pump.

27-42. -42. (canceled)

43. A reduced pressure dressing for applying reduced pressure treatment to a tissue site, the reduced pressure dressing comprising:

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

a first manifold layer in fluid communication with 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 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;

a non-motor-driven pump in fluid communication with the second manifold layer to deliver a reduced pressure to the tissue site;

a cover positioned over the non-motor-driven pump, the second manifold layer, the diverter layer, the absorbent layer, the first manifold layer, and the interface layer to maintain the reduced pressure at the tissue site; and

a liquid-air separator positioned between the second manifold and the non-motor-driven pump to inhibit liquid from entering the non-motor-driven pump.

44-76. -76. (canceled)