Cardiac monitoring electrode apparatus and method

• US 6,253,099 B1
• Filed: 08/19/1999
• Issued: 06/26/2001
• Est. Priority Date: 08/19/1999
• Status: Expired due to Term

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Lifecor Inc (Asahi Kasei Corporation)
• Inventors: Oskin, Emil, Quinnell, Scott D., Hulings, Robert J.
• Primary Examiner(s): COHEN, LEE S
• Application Number:
  US09/377,454
• Time in Patent Office: 677 Days
• Field of Search: 600/372, 600/382-390, 600/395-397, 607/115, 607/116, 607/119, 607/122, 298/25
• US Class Current: 600/372
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/28 for electrocardiography [ECG]
• CPC Class Codes: A61B 5/302 for capacitive or ionised electrodes, e.g. metal-oxide-semiconductor field-effect transistors [MOSFET]
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

An ECG electrode and method of making and using such. The electrode can have a domed electrode element attached to a housing containing an interface disk to which the concave side of the domed electrode connects. Within the housing a signal lead wire has one end attached to the non-skin-contacting side of the dome and another end connected to a signal transition circuit and a buffer amplifier circuit. The domed electrode element can be made by forming a metal disk into a dome and providing an oxide layer over the convex surface of the dome. The convex surface of the domed electrode can ensure reliable ECG signal acquisitions with lower radial forces generally than other electrode types, when positioned adjacent the skin of the patient and when coupled to cardiac activity monitoring equipment and a defibrillator for cardiac sensing capabilities.

Claims

1. A electrode element for sensing and treating cardiac conditions, the electrode element comprising:

a. a conductive substrate formed into the shape of a dome, the dome having a convex surface, a concave surface and an outer edge;

b. an oxide layer disposed entirely over the convex surface and said outer edge; and

c. wherein said oxide layer is an insulating material.

2. The electrode element of claim 1 further comprising the oxide layer being additionally disposed over at least a portion of the concave surface of the dome.

3. The electrode element of claim 1 further comprising a signal lead wire attached to the concave surface of the dome.

4. The electrode element of claim 3 further comprising the signal lead wire being welded to the concave surface of the dome.

5. The electrode element of claim 1 wherein the conductive substrate comprises a metal disk.

6. The electrode element of claim 5 wherein the metal disk comprises a tantalum metal disk.

7. The electrode element of claim 1 wherein the oxide layer comprises a tantalum pentoxide insulating layer.

8. The electrode element of claim 1 wherein the oxide layer comprises a tantalum pentoxide dielectric layer.

9. The electrode element of claim 1 further comprising the oxide layer being formed using an anodizing process.

10. The electrode element of claim 1 wherein said insulating material is a dielectric.

11. An electrode assembly for sensing and treating cardiac conditions, the electrode assembly comprising:

a. a conductive substrate formed into the shape of a dome, the dome having a convex surface, a concave surface and an outer edge;

b. an oxide layer disposed entirely over the convex surface;

c. a signal lead wire attached to the concave surface;

d. a signal transition circuit attached to the signal lead wire;

e. a buffer amplifier circuit attached to the signal lead wire/signal transition circuit;

f. a housing containing the signal lead wire, the signal transition circuit and the buffer amplifier circuit;

g. wherein the dome is connected to a first side of the housing with the concave surface adjacent the housing such that the outer edge is covered by the housing, and the convex surface projecting away from the housing; and

h. wherein said oxide layer is an insulating material.

12. The electrode assembly of claim 11 further comprising the oxide layer being additionally disposed over the outer edge of the dome.

13. The electrode assembly of claim 12 further comprising the oxide layer being additionally disposed over at least a portion of the concave surface of the dome.

14. The electrode assembly of claim 11 further comprising the lead wire being welded to the concave surface of the dome.

15. The electrode assembly of claim 11 wherein the conductive substrate comprises a metal disk.

16. The electrode assembly of claim 15 wherein the metal disk comprises a tantalum metal disk.

17. The electrode assembly of claim 11 wherein the oxide layer comprises a tantalum pentoxide insulating layer.

18. The electrode assembly of claim 11 wherein the oxide layer comprises a tantalum pentoxide dielectric layer.

19. The electrode assembly of claim 11 further comprising the oxide layer being formed using an anodizing process.

20. The electrode assembly of claim 11 further comprising an interface disk interposed between the concave surface and the housing.

21. The electrode assembly of claim 20 further comprising the interface disk having an annular groove and the outer edge of the dome being disposed in the annular groove.

22. The electrode assembly of claim 11 further comprising a cover connected to a second side of the housing.

23. The electrode assembly of claim 11 further comprising a resin interconnecting at least one of the dome, the interface disk and the signal transition circuit with at least one of each other and the housing.

24. The electrode assembly of claim 23 wherein the resin also immobilizes the signal lead wire within the housing.

25. The electrode assembly of claim 11 further comprising a cable for connecting the electrode assembly to a device for analyzing and displaying patient information.

26. The electrode assembly of claim 11 wherein said insulating material is a dielectric.

27. A method of making an electrode element for sensing and treating cardiac conditions, the method comprising:

a. forming a conductive substrate into a dome having a convex surface, a concave surface, and an outer edge; and

b. disposing an insulating material entirely over the convex surface and the outer edge.

28. The method of claim 27 further comprising additionally disposing the insulating material over at least a portion of the concave surface of the dome.

29. The method of claim 27 further comprising attaching a signal lead wire to the concave surface of the dome.

30. The method of claim 29 further comprising welding the signal lead wire to the concave surface of the dome.

31. The method of claim 27 wherein the conductive substrate comprises a metal disk.

32. The method of claim 31 wherein the metal disk comprises a tantalum metal disk.

33. The method of claim 27 wherein the insulating material comprises a tantalum pentoxide insulating layer.

34. The method of claim 27 wherein the insulating material comprises a tantalum pentoxide dielectric layer.

35. The method of claim 27 further comprising forming the insulating material using an anodizing process.

36. The method of claim 27 wherein said insulating material is a dielectric.

37. A method for sensing and treating cardiac conditions in a patient using at least one of cardiac activity monitoring device and a defibrillator, the method comprising:

a. providing at least one electrode assembly having a domed electrode element;

b. entirely covering an outer surface and an outer edge of said domed electrode element with an oxide layer, said oxide layer being an insulating material;

c. positioning said domed electrode element against the skin of a patient such that a convex surface of said domed electrode element is adjacent the skin; and

d. coupling said electrode assembly to at least one of said monitoring device and said defibrillator to at least one of sense cardiac function and deliver a defibrillation treatment.

38. The method of claim 37 wherein said insulating material is a dielectric.

39. A electrode element for sensing and treating cardiac conditions, the electrode element comprising:

a. a conductive substrate formed into the shape of a dome, the dome having a convex surface, a concave surface, and a skirt portion having an outer edge;

b. an oxide layer disposed over the entire convex surface and skirt portion, said oxide layer being an insulating material; and

c. a housing connectable to said dome at said outer edge, said housing enclosing said outer edge such that all exposed surfaces of said dome are entirely covered by said oxide layer.

40. The electrode element of claim 39 wherein said insulating material is a dielectric.

41. The electrode element of claim 39 further comprising said housing having an annular groove in which said outer edge is received.

42. The electrode element of claim 39 further comprising said oxide layer being additionally disposed over said outer edge.

43. The electrode element of claim 42 further comprising said oxide layer being additionally disposed over at least a portion of said concave surface.

44. The electrode element of claim 39 further comprising a signal lead wire welded to said concave surface.

45. The electrode element of claim 44 further comprising an interface member between said housing and said dome, said interface element having a first side which encloses said outer edge and a second side connectable to said housing.

46. The electrode element of claim 45 further comprising an annular groove in said interface member wherein said outer edge is received.

47. The electrode element of claim 45 a resinous material filling a space enclosed between at least one of said housing, said interface member and said concave surface, said resinous material generally encapsulating said signal wire.

48. The electrode element of claim 47 further comprising said resinous material adhesively joining at least one of said housing, said interface member and said concave surface.

49. The electrode element of claim 47 further comprising said resinous material aiding in immobilization of said signal wire welded to said concave surface.