Closed wound drainage system

• US 8,034,038 B2
• Filed: 03/13/2009
• Issued: 10/11/2011
• Est. Priority Date: 09/13/2002
• Status: Expired due to Term

• Current Assignee: Convatec Limited (ConvaTec Group Plc)
• Original Assignee: Neogen Technologies, Inc.
• Inventors: Biggie, Lydia B., Biggie, John J., Dawson, John A.
• Primary Examiner(s): Zalukaeva; Tatyana
• Assistant Examiner(s): Hanrahan; Benedict L
• Application Number:
  US12/403,950
• Publication Number:
  US 20090204085A1
• Time in Patent Office: 942 Days
• Field of Search: 604/319, 604/180, 604/304, 604/305, 604/307, 604336-338, 602/42
• US Class Current: 604/319
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• 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 1/80 Suction pumps A61M1/64, A61M1/71, A61M60/00 take precedence
• CPC Class Codes: A61M 1/882 Draining devices provided with means for releasing antimicrobial or gelation agents in the drained fluid
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/92 with liquid supply means
• CPC Class Codes: A61M 1/94 with gas supply means
• CPC Class Codes: A61M 1/98 Containers specifically adapted for negative pressure wound therapy
• CPC Class Codes: A61M 27/00 Drainage appliance for wounds or the like , i.e. wound drains, implanted drains negative pressure wound therapy devices A61M1/90; implements for holding wound open A61B17/02 ; middle ear drainage A61F11/202

Abstract

A portable closed wound drainage system that uses a pouch shaped dressing which is inserted into a wound. At least a portion of the outer surface of the pouch 1 is porous to allow exudates to enter. Exudates are removed from the pouch by flexible tubing which is secured inside the pouch at one end, and secured at the other end to a portable drain/suction unit. The pouch contains porous material, and may optionally contain beads and fillers which are antibacterial in nature. The tubing can have a single or multi-lumen structure with perforations in the side walls of the end of the tube that is inserted in the pouch to allow body fluids to enter laterally. The portable drain/suction unit is preferably a portable battery powered device. The pouch and the tube are sealed by a flexible sealing material which is applied to the outer surface of the skin around the periphery of the pouch and the tubing as it exits the pouch. This sealing material is preferably a hydro-colloid, a silicone, or a lyogel, such as a hydrogel, which are easily deformable. A cosmetic cover sheet is attached to the patient'"'"'s skin over the closed wound drainage system.

Claims

1. A system for treating a wound, comprising:

a wound cover having a top surface and a bottom surface, at least a periphery of the bottom surface being formed from a gel, the wound cover including a cavity for receiving exudates from the wound, the cavity having an opening defined at the bottom surface and covered by a porous layer at the bottom surface;

a tube having a proximal end and a distal end, the distal end extending into the cavity of the wound cover, wherein the tube includes at least a first lumen and a second lumen, the first lumen applies a negative pressure at the distal end of the tube and draws the exudates from the cavity to the proximal end, and the second lumen delivers medication to the distal end of the tube;

a receptacle coupled to the proximal end of the tube, the receptacle receiving the exudates drawn from the wound via the tube, the receptacle including a flexible collection bag including a first input and a second input, the first input coupled to the proximal end of the tube and receiving the exudates drawn from the wound, the second input coupled to a vacuum source, the vacuum source applying a negative pressure in the collection bag and at the distal end of the tube, the negative pressure drawing the exudates from the wound, the collection bag including an absorbent material disposed between two spacer layers, the absorbent material absorbing the exudates received from the wound, and the spacer layers providing support to the collection bag during application of negative pressure; and

a pressure sensor determining a measured pressure corresponding to a volume of exudates in the collection bag, the vacuum source being turned off when the measured pressure exceeds a threshold value,

wherein the first lumen applies the negative pressure at the distal end of the tube and to the cavity of the wound cover, and the gel has a tackiness that, when combined with the negative pressure in the cavity, supports the wound cover over a wound without needing an adhesive when the gel is in contact with a body surface surrounding the wound.

2. The system of claim 1, wherein the gel is a moisture permeable gel.

3. The system of claim 1, wherein the gel is formed from a hydrogel.

4. The system of claim 1 wherein the gel is a polymer matrix having a high glycerine content and bacteriostatic and fungistatic properties.

5. The system of claim 1, further comprising a vacuum source attached to the proximal end of the tube, the vacuum source applying, via the tube, the negative pressure at the distal end of the tube.

6. The system of claim 1, further comprising a porous packing disposed in the cavity of the wound cover, the porous packing including at least one of a woven organic, a non-woven organic, and a fiberfill.

7. The system of claim 1, wherein the wound cover includes a protective material at the top surface of the wound cover.

8. The system of claim 1, wherein the receptacle is formed at least from PVC, polyurethane, or a hard molded plastic material.

9. The system of claim 1, wherein the receptacle includes an absorbent material for absorbing the exudates received from the wound.

10. The system of claim 1, wherein the receptacle includes a gelling agent for gelling the exudates received from the wound.

11. The system of claim 1, wherein the pressure sensor is disposed in the collection bag.

12. The system of claim 1, wherein the pressure sensor is disposed at the distal end of the tube in the cavity of the wound cover.

13. The system of claim 1, further comprising a hydrophobic filter disposed between the collection bag and the vacuum source, the hydrophobic filter blocking the exudates from exiting the collection bag to the vacuum source.

14. The system of claim 13, wherein the pressure sensor turns off the vacuum source when the hydrophobic filter is activated by a full collection bag.

15. A system for treating a wound, comprising:

a wound cover having a top surface and a bottom surface, at least a periphery of the bottom surface being formed from a moisture permeable gel, the wound cover including a cavity for receiving exudates from the wound, the cavity having an opening defined at the bottom surface and covered by a porous layer at the bottom surface;

a tube having a proximal end and a distal end, the distal end extending into the cavity of the wound cover, wherein the tube includes at least a first lumen and a second lumen, the first lumen applies a negative pressure at the distal end of the tube and draws the exudates from the cavity to the proximal end, and the second lumen delivers medication to the distal end of the tube;

a receptacle coupled to the proximal end of the tube, the receptacle receiving the exudates drawn from the wound via the tube, the receptacle including a flexible collection bag including a first input and a second input, the first input coupled to the proximal end of the tube and receiving the exudates drawn from the wound, the second input coupled to a vacuum source, the vacuum source applying a negative pressure in the collection bag and at the distal end of the tube, the negative pressure drawing the exudates from the wound, the collection bag including an absorbent material disposed between two spacer layers, the absorbent material absorbing the exudates received from the wound, and the spacer layers providing support to the collection bag during application of negative pressure;

a pressure sensor determining a measured pressure corresponding to a volume of exudates in the collection bag, the vacuum source being turned off when the measured pressure exceeds a threshold value; and

a supporting element that supports the cavity of the wound cover when the negative pressure is applied to the distal end of the tube,

wherein the lumen applies a negative pressure at the distal end of the tube and to the cavity of the wound cover, and the gel has a tackiness that, when combined with the negative pressure in the cavity, supports the wound cover over a wound without needing an adhesive when the gel is in contact with a body surface surrounding the wound.

16. The system of claim 15, wherein the supporting element includes a porous packing disposed in the cavity of the wound cover.

17. The system of claim 15, wherein the gel is formed from a hydrogel.

18. The system of claim 15 wherein the gel is a polymer matrix having a high glycerine content and bacteriostatic and fungistatic properties.

19. The system of claim 15, further comprising a vacuum source attached to the proximal end of the tube, the vacuum source applying, via the tube, the negative pressure at the distal end of the tube.

20. The system of claim 15, wherein the wound cover includes a protective material at the top surface of the wound cover.