Self-contained cryothetrapy and suction system

• US 9,610,389 B2
• Filed: 02/27/2012
• Issued: 04/04/2017
• Est. Priority Date: 02/28/2011
• Status: Active Grant

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Ruland, Robert T.
• Primary Examiner(s): Deak, Leslie
• Assistant Examiner(s): WENG, KAI H
• Application Number:
  US13/406,233
• Publication Number:
  US 20120220960A1
• Time in Patent Office: 1,863 Days
• CPC Class Codes: A61F 2007/0056 for cooling
• CPC Class Codes: A61F 2007/0212 Foams
• CPC Class Codes: A61F 2007/0219 Gels
• CPC Class Codes: A61F 2007/0231 hook and loop-type fastener
• CPC Class Codes: A61F 2007/0239 using vacuum
• CPC Class Codes: A61F 2007/0257 with a fluid impermeable layer
• CPC Class Codes: A61F 2007/0258 with a fluid permeable layer
• CPC Class Codes: A61F 7/02 Compresses or poultices for effecting heating or cooling
• CPC Class Codes: A61M 1/918 for multiple suction locations
• CPC Class Codes: A61M 1/92 with liquid supply means
• CPC Class Codes: A61M 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 2205/3606 cooled

Abstract

A method for treating wounds, comprised of the application of reduced pressure to a wound site and alteration of the temperature over said wound. A system for wound healing, comprising: a substantial impermeable drape sized to cover and enclose the wound creating a reservoir and adapted to maintain reduced pressure at the site of the wound; a sterilizable porous cooling pad incorporated into a wound sponge adapted to provide localized cooling to said wound, said cooling pad located between said wound and said cover or over the drape; a reduced pressure supply mechanism capable of providing subatmosphere pressure over said wound site.

Claims

1. A system to promote the healing of a wound, comprising:

(a) a flexible drape sized to seal in a wound site, and adapted to maintain a substantial airtight watertight reservoir over the wound site, wherein said flexible drape has a resealable connector in the middle;

(b) a cooling pad, placed over the wound site and is in fluid communication with a coolant supply which has a control for temperature of outgoing coolant; and

(c) a reduced pressure mechanism including

(i) a control unit disposed within a housing, the control unit including a vacuum source; and

(ii) a collection storage having an interior wall defining an internal chamber in fluid communication with the vacuum source of the reduced pressure mechanism and with said reservoir over the wound site through a vacuum port for collecting exudates removed from the wound site under influence of the vacuum source;

wherein said reduced pressure mechanism maintains a pressure from about 2 in. Hg below atmospheric pressure to about 7 in. Hg below atmospheric pressure at the reservoir and wherein said coolant is maintained at a temperature from about 30°

F. to about 50°

.

2. The system of claim 1, further comprising a contacting layer adapted to prevent overgrowth of wound tissue, said contacting layer is placed directly over the wound site.

3. The system of claim 2, wherein said contacting layer is a screen.

4. The system of claim 3, wherein said screen is made of a material selected from the group consisting of polyurethane, polyethylene, polytetrafluoroethylene, and blends thereof.

5. The system of claim 1, further comprising one or more planar porous pad suitable for the transmission of negative pressure to the wound site and provided with a thickness less than its width and length.

6. The system of claim 5, wherein said porous pad is made of materials selected from the group consisting of a porous sheet, a foam screen, a sponge, open cell foam and a combination thereof.

7. The system of claim 5, wherein said porous pad is placed directly or indirectly over the wound site and under the drape.

8. The system of claim 1, wherein said flexible drape is made of a material selected from the group consisting of polyethylene, polypropylene, polyurethanes, polysiloxanes, polyamides, polyesters, other copolymers and mixtures thereof.

9. The system of claim 1, wherein said flexible drape is configured to be sealed to healthy tissue surrounding the wound site by applying an adhesive material applied to the peripheral of said drape.

10. The system of claim 1, wherein said flexible drape is configured to be sealed to the healthy tissue surrounding the wound site by adhesive tape.

11. The system of claim 1, wherein said vacuum port is connected to said reservoir over the wound site using flexible tubing, allowing fluid communication between the vacuum and the reservoir.

12. The system of claim 11, wherein

(a) a proximal end of said tubing is connected to the resealable opening on said drape;

and

(b) a distal end of said tubing is connected to the vacuum port.

13. The system of claim 12, wherein said tubing is connected to said resealable opening using a connector.

14. The system of claim 12, wherein at least a segment of said tubing is embedded underneath said drape.

15. The system of claim 1, wherein said control unit can adjust the reduced pressure applied to the wound.

16. The system of claim 1, wherein said collection storage further comprises means for halting said application of reduced pressure to the wound when said fluid exceeds a predetermined quantity.

17. The system of claim 12, wherein said collection storage comprising an aspirating container connected along said tubing between said control unit and said flexible drape.

18. The system of claim 16, wherein said means for halting comprising a flotation valve within said collection storage for blocking the flow of fluid when a predetermined amount of fluid is collected within said storage.

19. The system of claim 11, wherein said collection storage comprising indicators showing the amount of fluid collected inside said collection storage.

20. The system of claim 1, wherein said collection storage is an expandable chamber.

21. The system of claim 1, further comprising at least one filter interposed between said reservoir and said vacuum source.

23. The system of claim 21, wherein said filter is an odor vapor filter.

24. The system of claim 1, wherein said cooling pad is water-proof pouch having a continuous, outer surface, said outer surface forming an inner chamber containing a coolant.

25. The system of claim 24, wherein at least a portion of said pouch have openings, allowing aspired fluid from the wound site to pass through said cooling pad.

26. The system of claim 24, wherein said inner chamber of said cooling pad is adapted to allow coolant to circulate through the entire inner chamber.

27. The system of claim 24, wherein said coolant comprising of materials selected from the group consisting of alcohol, water, gel and other cooling fluid.

28. The system of claim 1, wherein said coolant supply comprising:

(a) a cooling unit capable of circulating coolant at a pressure exceeding the negative pressure of the vacuum source, and

(b) an inflow tubing and an outflow tubing, both tubing operably connected to and in fluid communication with said cooling unit and said inner chamber of said cooling pad.

29. The system of claim 28, wherein said cooling unit further comprising

(a) means for changing the temperature of said coolant;

(b) means for adjusting the temperature of said coolant and

(c) means for circuiting said coolant through said cooling unit, inflow tubing, inner chamber, and outflow tubing.

30. The system of claim 26, wherein said coolant is maintained at higher than normal body temperature , which aids wound healing after free tissue transfer.

22. The system of 21, wherein said filter is hydrophobic filter.