Wound dressing with vacuum reservoir

• US 7,699,823 B2
• Filed: 09/06/2006
• Issued: 04/20/2010
• Est. Priority Date: 09/07/2005
• Status: Expired due to Fees

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Haggstrom, Kurt, Fink, David, Grundmeier, Katja
• Primary Examiner(s): Zalukaeva; Tatyana
• Assistant Examiner(s): ANDERSON, CATHARINE L
• Application Number:
  US11/516,925
• Publication Number:
  US 20070066946A1
• Time in Patent Office: 1,322 Days
• Field of Search: 604/305, 604/307, 604/308, 604/313, 604/315, 60438504-38505, 60438525-38528, 604/385.101
• 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 13/0209 comprising superabsorbent material
• 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 1/732 Visual indicating means for vacuum pressure
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/966 having a pressure sensor on or near the dressing
• CPC Class Codes: A61M 1/984 portable on the body
• 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 2205/18 with alarm
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/584 having a color code
• CPC Class Codes: A61M 2205/587 Lighting arrangements
• CPC Class Codes: A61M 2205/6081 Colour codes
• 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
• CPC Class Codes: A61M 39/24 Check- or non-return valves

Abstract

A wound dressing apparatus includes a wound dressing member dimensioned for positioning relative to a wound bed. The wound dressing member including an internal vacuum reservoir and has a port in communication with the vacuum reservoir for applying subatmospheric pressure to the vacuum reservoir to facilitate removal of fluid from the wound bed. The wound dressing member includes a visual pressure indicator associated therewith for indicating a level of pressure within the vacuum reservoir. The visual pressure indicator includes color indicia having a plurality of colors corresponding to a condition of the pressure within the vacuum reservoir. The wound dressing member includes a lower absorbent member positionable adjacent the wound bed and an upper member which at least partially defines the vacuum reservoir. At least one of the top member and the lower absorbent member has the visual pressure indicator mounted thereto. The preferred visual pressure indicator includes an electronic position sensor. The visual pressure indicator further includes circuit means and visible alarm means. The circuit means is adapted to actuate the visible alarm means when the position sensor detects a relative positioning of the top member of the wound dressing member to provide a visual indication of the condition of the subatmospheric pressure within the vacuum reservoir.

Claims

1. A wound dressing apparatus, which comprises:

a wound dressing member dimensioned for positioning relative to a wound bed, the wound dressing member including a top member defining an internal vacuum reservoir and having a port in communication with the vacuum reservoir for applying subatmospheric pressure to the vacuum reservoir to facilitate healing and removal of fluid from the wound bed, the wound dressing member including a visual pressure indicator associated therewith for indicating a level of pressure within the vacuum reservoir, the visual pressure indicator including an electronic position sensor, the electronic position sensor being configured to detect a position of the top member relative to the wound bed as indicative of the pressure level within the vacuum reservoir, the electronic position sensor including an electronic switch having an associated electrical contact mounted to the top member, the electronic switch being closed when the pressure level within the vacuum reservoir achieves a predetermined value.

2. The wound dressing apparatus according to claim 1 wherein the wound dressing member includes a lower absorbent member positionable adjacent the wound bed and the top member.

3. The wound dressing apparatus according to claim 2 wherein at least one of the top member and the lower absorbent member has the visual pressure indicator mounted thereto.

4. The wound dressing apparatus according to claim 2 wherein the lower absorbent member comprises a material selected from the group consisting of foams, nonwoven composite fabrics, hydrogels, cellulosic fabrics, super absorbent polymers, and combinations thereof.

5. The wound dressing apparatus according to claim 4 wherein the lower member includes at least one of a medicament, an anti-infective agent, an antimicrobial, polyhexamethylene biguanide (hereinafter, “

PHMB”

), antibiotics, analgesics, healing factors, vitamins, growth factors, debridement agents and nutrients.

6. The wound dressing apparatus according to claim 1 wherein the wound dressing member includes an adhesive member, the adhesive member 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 wound dressing apparatus according to claim 1 wherein the upper member comprises a resilient material.

8. The wound dressing apparatus according to claim 1 wherein the port includes valve means.

9. The wound dressing apparatus according to claim 1 further including a vacuum source in fluid communication with the port, the vacuum source supplying subatmospheric pressure in a range between about 20 mmHg and about 500 mmHg to the vacuum reservoir.

10. The wound dressing apparatus according to claim 1 wherein the visual pressure indicator includes color indicia, the color indicia having a plurality of colors, each color corresponding to a condition of the pressure within the vacuum reservoir.

11. The wound dressing apparatus according to claim 1 wherein the visual pressure indicator includes circuit means and visible alarm means, the circuit means adapted to actuate the visible alarm means when the position sensor detects a relative positioning of the top member of the wound dressing member to provide a visual indication of the condition of the subatmospheric pressure within the vacuum reservoir.

12. The wound dressing apparatus according to claim 1 wherein the visual pressure indicator includes first and second electronic position sensors, the first position sensor adapted to detect the position of the top member relative to the wound bed as indicative of a first pressure level within the vacuum reservoir, the second position sensor adapted to detect the position of the top member relative to the wound bed as indicative of a second pressure level within the vacuum reservoir different from the first pressure level.

13. The wound dressing apparatus according to claim 12 wherein the visual pressure indicator includes visual indicia associated with the first and second position indicators and adapted for respective activation upon reaching of the first and second pressure levels within the vacuum reservoir.

14. The wound dressing apparatus according to claim 13 wherein the visual pressure indicator includes a third electronic position sensors, the third position sensor adapted to detect the position of the top member relative to the wound bed as indicative of a third pressure level within the vacuum reservoir different from the first and second pressure levels.

15. The wound dressing apparatus according to claim 14 wherein the visual pressure indicator includes visual indicia associated with the first, second and third position indicators and adapted for respective activation upon reaching of the first, second and third pressure levels within the vacuum reservoir.

16. The wound dressing apparatus according to claim 1 wherein the wound dressing member includes a lower absorbent member positionable adjacent the wound bed, the lower absorbent member having an electrical contact associated with the electrical contact mounted to the top member.

17. A wound dressing apparatus, which comprises:

a wound dressing member dimensioned for positioning relative to a wound bed, the wound dressing member including a top member defining an internal vacuum reservoir and having a port in communication with the vacuum reservoir for applying subatmospheric pressure to the vacuum reservoir to facilitate healing and removal of fluid from the wound bed; and

a visual pressure indicator including first and second electronic position sensors mounted to the wound dressing member and first and second visual indicia respectively associated with the first and second electronic positions sensors, the first position sensor adapted to detect a first pressure level within the vacuum reservoir and the second position sensor adapted to detect a second pressure level within the vacuum reservoir different from the first pressure level, the first and second pressure levels being indicated by respective first and second visual indicia.

18. The wound dressing apparatus according to claim 17 wherein the first and second electronic position sensors are associated with the top member, the first position sensor adapted to detect a first position of the top member relative to the wound bed corresponding to the first pressure level and the second position sensor adapted to detect a second position of the top member relative to the wound be corresponding to the second pressure level.

19. The wound dressing apparatus according to claim 18 including a third electronic position sensor, the third electronic position sensor adapted to detect a third position of the top member relative to the wound be corresponding to a third pressure level different from the first and second pressure levels.