Multilayer conductive appliance having wound healing and analgesic properties

• US 7,214,847 B1
• Filed: 07/11/2000
• Issued: 05/08/2007
• Est. Priority Date: 09/22/1997
• Status: Expired due to Fees

• Current Assignee: Argentum Medical LLC
• Original Assignee: Argentum Medical LLC
• Inventors: Flick, A. Bart
• Primary Examiner(s): Lewis; Kim M.
• Application Number:
  US09/613,961
• Time in Patent Office: 2,492 Days
• Field of Search: 662 41- 59, 662 74- 79, 604304-308, 425/412, 425/103, 128/888, 128/889, 428/112, 428/103, 428/294.1, 424443-449, 602 41- 45, 602/52, 602/54, 602/48, 602/58, 602/59
• US Class Current: 602/48
• CPC Class Codes: A61F 13/01008 characterised by the material
• CPC Class Codes: A61F 13/06 specially adapted for feet or legs; Corn-pads; Corn-rings
• CPC Class Codes: A61F 13/069 Decubitus ulcer bandages
• CPC Class Codes: A61F 13/104 for the hands or fingers A61F13/107 takes precedence
• CPC Class Codes: A61F 13/20 Tampons, e.g. catamenial tampons; Accessories therefor
• CPC Class Codes: A61F 2013/00093 tubular
• CPC Class Codes: A61F 2013/00157 for burns or skin transplants A61F2013/00187 takes precedence; not adhering to the wound A61F2013/00217
• CPC Class Codes: A61F 2013/0034 with triboelectric materials
• CPC Class Codes: A61F 2013/00412 for use with needles, tubes or catheters
• CPC Class Codes: A61F 2013/00519 for treating burn
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/0054 for deep wounds
• CPC Class Codes: A61F 2013/00919 for physical therapy, e.g. cold or magnetic
• CPC Class Codes: A61F 2013/00923 triboelectricity
• CPC Class Codes: A61F 2013/00936 metal
• CPC Class Codes: A61L 15/18 containing inorganic materials
• CPC Class Codes: Y10T 428/24041 Discontinuous or differential coating, impregnation, or bond
• CPC Class Codes: Y10T 428/24993 Fiber is precoated

Abstract

A dressing for promoting healing and pain relief of the body of a living organism having a pathologic condition has at least one layer of conductive material having a resistance no greater than 1000 Ω/cm². When placed proximate a portion of the body of the living organism suffering from the pathologic condition, the dressing alters the electrodynamic processes occurring in conjunction with said pathologic condition to promote healing and pain relief in the living organism. When used as a wound dressing, the conductive material is placed in contact with tissue around the periphery of the wound and with the wound, lowering the electrical potential and resistance of the wound and increasing the wound current. In an exemplary embodiment, the conductive material is a multi-ply nylon fabric plated with silver by an autocatalytic electroless plating process and with the plies in electrical continuity. The dressing provides an antimicrobial and analgesic effect. The dressing may be provided for numerous applications and may include other layers such as an absorbent layer, a semi-permeable layer and additional layer of conductor material. Multilaminate embodiments of the present invention exhibit conductive material concentration gradients and, potentially, a capacitive effect when sequential conductor layers are insulated by intervening layers.

Claims

1. A medical device, comprising,

a) a wound dressing comprising more than two layers of a fibrous material;

wherein the material contains nonmetalized fibers and fibers that are at least partially coated with a metallic material to yield metalized fibers, each layer being joined to an adjacent layer and having a ratio of metalized fibers to nonmetalized fibers; and

b) an appliance, wherein the wound dressing is incorporated into the appliance such that the layers of the wound dressing form a gradient of metalized fiber to nonmetalized fiber ratios, the highest ratio layer capable of being placed in contact with a wound site.

2. The medical device of claim 1, wherein the appliance is shaped for a use selected from the group consisting of orthopedic, dental, catheter, packing a body cavity, an ostomy site, a tracheostomy site, and around external fixture pin structures.

3. The medical device of claim 1 wherein the appliance has a tubular shape.

4. The medical device of claim 2 wherein the appliance is a wound drain.

5. A medical device comprising:

conformable, conductive fabric comprising a biologically inert polymer uniformly coated with an antimicrobial metal, wherein said conformable, conductive fabric has a surface resistivity of less than about 1 Ohm/in² and interiorly shifts a pathology'"'"'s maximum electrical resistance by an amount sufficient to induce an analgesic effect when in contact with a pathology.

6. The medical device of claim 5, wherein said shift stimulates healing.

7. The medical device of claim 5, further comprising a moisture retaining layer.

8. The medical device of claim 5, wherein said polymer is coated using a solution electroless plating process.

9. The medical device of claim 8, wherein said metal comprises silver.

10. The medical device of claim 5, wherein the fibers are electrolessly plated with a metal or metal alloy.

11. The medical device of claim 10, wherein the metal of metal alloy comprises silver.

12. A medical device comprising:

at least one layer of conformable, conductive fabric material having a surface resistance less than about 1 ohms/cm², wherein said at least one layer of conformable, conductive fabric material comprises a biologically inert polymer and a conductor; and

wherein said medical device induces an analgesic effect by interiorly shifting a pathology'"'"'s maximum electrical resistance when applied to the pathology.

13. A medical device comprising:

at least one layer of conductive material comprising at least two plies of a conductor, wherein the at least one layer of conductive material has a surface resistance less than about 1 ohms/cm², and wherein at least one of said at least two plies of a conductor comprises a biologically inert polymer, and wherein the device interiorly shifts a pathology'"'"'s maximum electrical resistance when in conductive contact with the pathology by an amount effective to promote healing and induce an analgesic effect.

14. A wound dressing for treating a pathology in a portion of a living organism, comprising at least one layer of conformable, conductive fabric having a surface resistance of less than about 1 Ohm/in², wherein the at least one layer of conformable, conductive fabric comprises a biologically inert polymer uniformly coated with a metal of a metal alloy;

and wherein the wound dressing is configured to passively lower the pathology'"'"'s electrical potential by an amount effective to promote wound healing.