Pressure sore pad having self-limiting electrosurgical return electrode properties and optional heating/cooling capabilities

• US 6,544,258 B2
• Filed: 01/31/2001
• Issued: 04/08/2003
• Est. Priority Date: 10/30/1996
• Status: Expired due to Term

• Current Assignee: Megadyne Medical Products Incorporated (Johnson & Johnson)
• Original Assignee: Megadyne Medical Products Incorporated (Johnson & Johnson)
• Inventors: Borgmeier, Paul R., Fleenor, Richard P., Kieda, David B., Isaacson, James D.
• Primary Examiner(s): COHEN, LEE S
• Application Number:
  US09/773,282
• Publication Number:
  US 20010029367A1
• Time in Patent Office: 797 Days
• Field of Search: 606/32, 606/35, 606/39, 607/152, 128/908
• US Class Current: 606/32
• CPC Class Codes: A61B 18/16 Indifferent or passive electrodes for grounding
• CPC Class Codes: A61B 2018/00023 closed, i.e. without wound contact by the fluid
• CPC Class Codes: A61B 2018/167 Passive electrodes capacitively coupled to the skin
• CPC Class Codes: A61B 2090/0813 Accessories designed for easy sterilising, i.e. re-usable
• CPC Class Codes: A61B 46/10 specially adapted for instruments, e.g. microscopes
• CPC Class Codes: A61B 46/40 Drape material, e.g. laminates; Manufacture thereof
• CPC Class Codes: A61B 50/13 Trolleys, e.g. carts
• CPC Class Codes: A61F 2007/0054 with a closed fluid circuit, e.g. hot water
• CPC Class Codes: A61F 7/02 Compresses or poultices for effecting heating or cooling
• CPC Class Codes: Y10S 128/908 Patient protection from electric shock

Abstract

A self-limiting electrosurgical electrode for use with electrosurgery and various other surgical procedures. The electrode can include a pad and a conductive element that collectively has an effective bulk impedance equal to or greater than about 4,000 Ω·cm. The effective bulk impedance of the electrode arises from resistive components, capacitive components, inductive components, or combinations thereof of both the pad and the conductive element. Through the selection of the impedance characteristics for the electrode materials, and through tailoring of electrode geometries, the electrode of the present invention is self-regulating and self-limiting as to current density and temperature rise so as to prevent patient trauma. Additionally, the selection of materials and electrode geometries can prevent the creation of pressure sore or decubitus ulcers on a patient resting upon the electrode. Further, alternate configurations of the electrosurgical electrode can heat and/or cool a patient during the performance of a surgical procedure.

Claims

1. An electrosurgical electrode comprising:

(a) a pad configured to substantially prevent the creation of one or more pressure sores on a patient resting upon said pad; and

(b) a conductive element configured to electrically communicate with said pad and configured to conduct electrical current

wherein, said pad and said conductive element collectively have an effective bulk impedance equal to or greater than about 4,000 Ω

·

cm.

2. An electrosurgical electrode according to claim 1, wherein said conductive element comprises electrically conducting material having an effective bulk impedance equal to or greater than about 4,000 Ω

·

cm.

3. An electrosurgical electrode according to claim 1, wherein said pad comprises electrically conducting material having an effective bulk impedance equal to or greater than about 4,000 Ω

·

cm.

4. An electrosurgical electrode according to claim 1, wherein said pad comprises a dielectric material.

5. An electrosurgical electrode according to claim 1, wherein said pad comprises a conducting material.

6. An electrosurgical electrode according to claim 1, wherein said pad comprises an elastomeric material.

7. An electrosurgical electrode according to claim 1, wherein said pad comprises a dielectric material and a conducting material.

8. An electrosurgical electrode according to claim 1, wherein said pad comprises an interior chamber and one or more baffles disposed with said interior chamber.

9. An electrosurgical electrode according to claim 1, wherein said pad and said conducting element comprises a lattice structure.

10. An electrosurgical electrode according to claim 1, wherein said pad comprises a port in communication with an interior chamber, said port being configured to allow a material to circulate through said interior chamber.

11. An electrosurgical electrode according to claim 1, wherein said conductive element comprises normally insulating material impregnated with electrically conducting fibers to render the electrosurgical electrode to have an effective bulk impedance equal to or greater than about 4,000 Ω

·

cm.

12. An electrosurgical electrode according to claim 1, wherein said pad comprises normally insulating material impregnated with electrically conducting fibers to render said sheet to have an effective bulk impedance equal to or greater than about 4,000 Ω

·

cm.

13. An electrosurgical electrode according to claim 1, wherein said collective effective bulk impedance of said pad and said conductive element comprises electrical components selected from the group consisting of resistance, capacitive, inductive, and combinations thereof.

14. An electrosurgical electrode according to claim 1, wherein said conductive element comprises:

(a) an electrode, said electrode comprising;

(i) a first layer of predetermined limited electrical conductivity; and

(ii) a second layer of dielectric material having a predetermined capacitive reactance, said second layer contacting and overlying said first layer.

15. The electrosurgical electrode according to claim 1, wherein said pad comprises a working surface for being positioned in contact with or in close proximity to a patient.

16. The electrosurgical electrode according to claim 1, wherein said conductive element comprises a working surface for being positioned in contact with or in close proximity to a patient.

17. The electrosurgical electrode according to claim 15 or 16, wherein said working surface having a surface area within a range from about 11 to about 1500 square inches.

18. An electrosurgical electrode according to claim 1 wherein the electrode is sterilizable.

19. An electrosurgical electrode according to claim 1 wherein the electrode is washable.

20. An electrosurgical electrode according to claim 1 wherein the electrode is reusable.

21. An electrosurgical electrode according to claim 1 wherein the electrode is disinfectable.

22. The electrosurgical electrode according to claim 1, further comprising a sleeve substantially enclosing said pad and said conductive element.

23. An electrosurgical electrode for preventing the creation of pressure sores on a patient resting upon the electrosurgical electrode, the electrosurgical electrode comprising:

(a) a pad having an interior chamber therein, said interior chamber being filled with a material; and

(b) a conductive element coupled to said pad and configured to conduct electrical current through said pad;

wherein, the collective bulk resistance of said pad and said conductive element is equal to or greater than about 4,000 Ω

·

cm.

24. An electrosurgical electrode according to claim 23, wherein said conductive element comprises electrically conducting material having an effective bulk resistivity equal to or greater than about 4,000 Ω

·

cm.

25. An electrosurgical electrode according to claim 23, wherein said conductive element comprises normally insulating material impregnated with electrically conducting fibers to render said sheet to have an effective bulk resistivity equal to or greater than about 4,000 Ω

·

cm.

26. An electrosurgical electrode according to claim 23, wherein said conductive element comprises:

(a) an electrode, said electrode comprising;

(i) a first layer of predetermined limited electrical conductivity; and

(ii) a second layer of dielectric material having predetermined impedance,

said second layer contacting and overlying said first layer.

27. An electrosurgical electrode according to claim 23, wherein said pad comprises a working surface for being positioned in contact with or in close proximity to a patient.

28. An electrosurgical electrode according to claim 23, wherein said conductive element comprises a working surface for being positioned in contact with or in close proximity to a patient.

29. An electrosurgical electrode according to claim 27 or 28, wherein said working surface having a surface area within a range from about 11 to about 1500 square inches.

30. An electrosurgical electrode according to claim 23, wherein the electrode is sterilizable, washable, reusable, disinfectable, or disposable.

31. An electrosurgical electrode according to claim 23, further comprising an insulating sleeve substantially enclosing said pad and said conductive element.

32. An electrosurgical electrode according to claim 23 further comprising connecting means for making electrical connection with said conductive element.

33. An electrosurgical electrode according to claim 23, wherein said material comprises a dielectric material.

34. An electrosurgical electrode according to claim 23, wherein said material comprises a conducting material.

35. An electrosurgical electrode according to claim 23, wherein said material comprises an elastomeric material.

36. An electrosurgical electrode according to claim 23, wherein said interior chamber comprises one or more sub-chambers defined by one or more baffles.

37. An electrosurgical electrode according to claim 36, wherein said one or more sub-chambers communicate one with another.

38. An electrosurgical electrode according to claim 23, wherein said pad and said conductive element comprises a lattice structure, said lattice structure configured to provide the electrosurgical electrode with flexibility.

39. An electrosurgical electrode according to claim 23, wherein said pad comprises an inlet port and an outlet port in communication with said interior chamber, said inlet port and said outlet port being configured to assist with the circulation of said material through said interior chamber.

40. An electrosurgical electrode according to claim 39, further comprising a pump assembly communicating with said inlet port and said outlet port, said pump assembly being configured to circulate said material through said interior chamber.

41. An electrosurgical electrode according to claim 40, wherein said pump assembly is configured to reduce the temperature of said material as said material passes through said pump assembly.

42. An electrosurgical electrode according to claim 40, wherein said pump assembly is configured to increase the temperature of said material as said material passes through said pump assembly.

43. An electrosurgical electrode for use during surgical procedures, the electrosurgical electrode comprising:

(a) a pad having an interior chamber therein, said interior chamber being filled with a material; and

(b) a conductive element coupled to said pad and configured to conduct electrical current through said pad;

wherein, the collective bulk resistance of said pad and said conductive element is equal to or greater than about 4,000 Ω

·

cm.

44. An electrosurgical electrode according to claim 43, wherein said pad comprises an inlet port and an outlet port in communication with said interior chamber, said inlet port and said outlet port being configured to assist with the circulation of said material through said interior chamber.

45. An electrosurgical electrode according to claim 44, further comprising a pump assembly communicating with said inlet port and said outlet port, said pump assembly being configured to circulate said material through said interior chamber.