Self contained wound dressing with micropump

• US 7,838,717 B2
• Filed: 07/01/2009
• Issued: 11/23/2010
• Est. Priority Date: 09/07/2005
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Tranchemontagne, Alain, Haggstrom, Kurt, Jinga, Loredana
• Primary Examiner(s): Bianco; Patricia M
• Assistant Examiner(s): Patel; Tarla R
• Application Number:
  US12/496,263
• Publication Number:
  US 20090264807A1
• Time in Patent Office: 510 Days
• Field of Search: 128/888, 206/288, 206/289, 206/313, 206/315, 602/2, 602 41- 43, 602 53- 54, 424443-449, 604/304, 604/305, 604307-308, 604/313, 604/315, 604/543, 604/521, 604/48, 604/500, 604/503, 604/505, 604/176, 604289-290
• US Class Current: 602/53
• CPC Class Codes: A61F 13/00055 Saturation indicators
• 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 13/0203 with fluid retention members
• CPC Class Codes: A61F 13/023 wound covering film layers without a fluid retention layer
• 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 2013/00182 with transparent part
• CPC Class Codes: A61F 2013/00553 with detachable parts
• CPC Class Codes: A61F 2013/0057 with openable cover
• CPC Class Codes: A61F 2013/00846 with transparent or translucent part
• CPC Class Codes: A61F 2013/0091 with disinfecting or anaesthetics means, e.g. anti-mycrobic
• CPC Class Codes: A61F 2013/00927 with biological activity, e.g. enzymes for debriding wounds or others, collagen or growth factors
• CPC Class Codes: A61F 2013/00944 humidity; moisture
• CPC Class Codes: A61F 2013/00957 pressure
• CPC Class Codes: A61M 1/732 Visual indicating means for vacuum pressure
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/90 Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
• 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 1/966 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 2205/3592 : using telemetric means, e.g. radio or optical transmission
• CPC Class Codes: A61M 2205/8206 : battery-operated
• 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 composite wound dressing apparatus promotes healing of a wound via the use of a micropump system housed within a wound dressing member. The micropump system includes a miniature pump that applies a subatmospheric pressure to the wound to effectively draw wound fluid or exudate away from the wound bed without the need for an external vacuum source. Hence, the wound dressing and micropump system is portable which allows the patient mobility that is unavailable when an external vacuum source is used. The patient does not need to be constrained for any period of time while exudate is being removed from the wound.

Claims

1. An apparatus for treating a wound, which comprises:

a wound dressing member dimensioned for positioning adjacent a wound bed;

a subatmospheric pressure mechanism including;

a subatmospheric pressure generator supported by the wound dressing member, the subatmospheric pressure generator dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing;

an electronic controller for controlling operation of the subatmospheric pressure generator; and

a pressure sensor dimensioned and adapted to detect pressure associated with the subatmospheric generator and send a corresponding signal to the controller; and

a pressure level indicator independent of the subatmospheric pressure mechanism and in fluid communication with the wound dressing member for indicating a pressure condition within the wound bed.

2. The apparatus according to claim 1 wherein the subatmospheric pressure generator is at least partially embedded within the wound dressing member.

3. The apparatus according to claim 1 the controller is adapted to control or vary the output of the subatmospheric pressure generator in response to the pressure sensed by the pressure sensor.

4. The apparatus according to claim 1 wherein the wound dressing member includes a packing member positionable adjacent the wound bed and a top member for positioning over the wound bed.

5. The apparatus according to claim 4 wherein the subatmospheric pressure generator is at least partially positioned within the packing member.

6. The apparatus according to claim 5 wherein the top member is an adhesive member, the adhesive member dimensioned and adapted to be secured about the wound bed to provide a seal between the wound dressing member and tissue surrounding the wound bed.

7. The apparatus according to claim 1 including a conduit in fluid communication with the subatmospheric pressure generator.

8. The apparatus according to claim 7 wherein the conduit is dimensioned and adapted to convey fluids from the wound bed.

9. The apparatus according to claim 1 including a canister in fluid communication with the wound bed.

10. The apparatus according to claim 1 wherein the subatmospheric pressure generator is a pump.

11. The method according to claim 1 wherein the dressing member includes a base layer for positioning in contact with the wound bed, the base layer including a plurality of unidirectional apertures dimensioned and adapted to permit flow of exudates solely in a one direction from the wound bed through the base layer for removal by the subatmospheric pressure mechanism.

12. An apparatus for treating a wound, which comprises:

a wound dressing member dimensioned for positioning adjacent a wound bed; and

a subatmospheric pressure mechanism including;

a subatmospheric pressure generator is enclosed within the wound dressing member, the subatmospheric pressure generator dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing; and

an electronic controller for controlling operation of the subatmospheric pressure generator.

13. The apparatus according to claim 12 wherein the subatmospheric pressure mechanism includes a pressure sensor dimensioned and adapted to detect pressure at a predetermined location relative to the wound dressing member and send a corresponding signal to the controller.

14. The apparatus according to claim 12 including a saturation indicator mounted within the wound dressing member for indicating a degree of saturation thereof.

15. An apparatus for treating a wound, which comprises:

a wound dressing member dimensioned for positioning adjacent a wound bed;

a subatmospheric pressure mechanism including;

a subatmospheric pressure generator supported by the wound dressing member, the subatmospheric pressure generator dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing, the subatmospheric pressure mechanism including a battery for actuating the subatmospheric pressure generator, the battery being dimensioned and adapted for implantation within the wound dressing member; and

an electronic controller for controlling operation of the subatmospheric pressure generator.

16. The apparatus according to claim 15 wherein the subatmospheric pressure mechanism includes a pressure sensor dimensioned and adapted to detect pressure at a predetermined location relative to the wound dressing member and send a corresponding signal to the controller.

17. An apparatus for treating a wound, comprising a wound dressing dimensioned and configured for positioning adjacent a wound bed, the wound dressing including a top member for at least partially enclosing the wound bed and a packing member positionable adjacent the wound bed beneath the top member, and further including a subatmospheric generator is at least partially disposed within the packing member, the subatmospheric generator dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to displace fluid relative thereto to facilitate healing.

18. An apparatus for treating a wound, comprising:

a wound dressing member dimensioned for positioning adjacent a wound bed, the wound dressing member including at least a top member for at least partially enclosing the wound bed;

a subatmospheric pressure generator mounted to the wound dressing member beneath the top member, the subatmospheric pressure generator dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing; and

a power source for actuating the subatmospheric pressure generator.

19. The apparatus according to claim 18 wherein the power source is operatively connected to the subatmospheric pressure generator.

20. A method for facilitating healing of a wound, comprising the steps of:

positioning a wound dressing adjacent a wound bed by at least partially encircling the wound bed with a top member of the wound dressing;

mounting a pump of a subatmospheric pressure generator relative to the wound dressing and at least partially beneath the top member; and

actuating the pump of the subatmospheric pressure generator to generate subatmospheric pressure at predefined therapeutic levels to at least displace fluids relative to the wound bed to facilitate healing thereof.

21. The method according to claim 20 including the step of disposing the wound dressing and the subatmospheric pressure generator subsequent to a predefined period of treatment.

22. The method according to claim 20 wherein the step of mounting includes supporting the pump with the wound dressing.

23. The method according to claim 22 wherein the wound dressing includes a top member for at least partially encircling the wound bed and a filler for positioning adjacent the wound bed, and wherein the step of mounting includes at least partially positioning the pump within the filler.

24. The method according to claim 22 wherein the step of mounting includes enclosing the pump beneath the top member of the wound dressing.

25. An apparatus for treating a wound, which comprises:

a wound dressing member dimensioned for positioning adjacent a wound bed, the wound dressing member including a base layer dimensioned and adapted for positioning in contact with the wound bed and a packing member, the base layer comprising a plurality of unidirectional apertures dimensioned and adapted to permit flow of exudates substantially solely in one direction from the wound bed through the base layer for collection by the packing member; and

a subatmospheric pressure mechanism including;

a subatmospheric pressure generator dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing;

an electronic controller for controlling operation of the subatmospheric pressure generator; and

a sensor dimensioned and adapted to detect at least one parameter and send a corresponding signal to the controller.

26. An apparatus for treating a wound, which comprises:

a wound dressing member dimensioned for positioning adjacent a wound bed;

a subatmospheric pressure mechanism including;

a pump supported by the wound dressing member, the pump adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing; and

a controller for controlling operation of the pump,

a pressure level indicator independent of the subatmospheric pressure mechanism and in fluid communication with the wound dressing member for indicating a pressure condition within the wound dressing.

27. The apparatus according to claim 26 wherein the pressure level indicator includes a visual indicator for indicating the pressure condition.

28. The apparatus according to claim 27 wherein the visual indicator includes a color coded element.

29. The apparatus according to claim 26 wherein the pressure level indicator is at least partially embedded within the wound dressing member.

30. The apparatus according to claim 26 including a saturation indicator mounted within the wound dressing member for indicating a degree of saturation thereof.

31. The apparatus according to claim 26 wherein the subatmospheric pressure mechanism further includes a pressure sensor dimensioned and adapted to detect pressure at a predetermined location relative to the wound dressing member, and send a corresponding signal to the controller.

32. An apparatus for treating a wound, which comprises:

a wound dressing member dimensioned for positioning adjacent a wound bed; and

a subatmospheric pressure mechanism including;

a pump dimensioned and adapted to generate subatmospheric pressure at predefined therapeutic levels and to supply the subatmospheric pressure adjacent the wound bed to facilitate healing; and

an electronic controller for controlling operation of the pump; and

a saturation indicator in fluid communication with the wound dressing member for indicating a degree of saturation thereof.

33. The apparatus according to claim 32 wherein the saturation indicator is mounted within the wound dressing member.

34. The apparatus according to claim 32 wherein the pump is enclosed within the wound dressing member.