Non-invasive, radiolucent cardiac electrode

• US 5,366,497 A
• Filed: 03/31/1992
• Issued: 11/22/1994
• Est. Priority Date: 03/31/1992
• Status: Expired due to Term

• Current Assignee: Conmed Corporation (Jefferies Financial Group, Inc.)
• Original Assignee: Cardiotronics, Inc.
• Inventors: Ilvento, Joseph P., Bisceglia, Bruno T. Jr., Way, Tim J.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Getzow, Scott M.
• Application Number:
  US07/860,995
• Time in Patent Office: 966 Days
• Field of Search: 128/639, 128/640, 128/798, 128/783, 128/653.2, 128/660.07, 128/661.02, 128/661.04, 128/653.1, 607/5, 607/4
• US Class Current: 607/142
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/257 using adhesive means, e.g. adhesive pads or tapes
• CPC Class Codes: A61B 5/268 containing conductive polymers, e.g. PEDOT:PSS polymers
• CPC Class Codes: A61B 5/273 Connection of cords, cables or leads to electrodes
• CPC Class Codes: A61B 5/28 for electrocardiography [ECG]
• CPC Class Codes: A61N 1/0496 characterised by using specific chemical compositions, e.g. hydrogel compositions, adhesives
• CPC Class Codes: A61N 1/36014 External stimulators, e.g. with patch electrodes external pacemakers A61N1/3625
• CPC Class Codes: A61N 1/3625 External stimulators
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]

Abstract

A non-invasive radiolucent electrode for stimulating the heart is disclosed. The electrode is configured to include at least one pad having a first surface adapted to contact the patient'"'"'s skin, and a conductive mesh backing substantially covering a second surface of the pad and configured to be radiolucent.

Claims

1. A non-invasive radiolucent electrode comprising:

an adhesive conductive polymer pad having a first surface adapted for contacting a patient'"'"'s skin, and having a second surface;

a stainless steel wire mesh backing to said pad configured to have between about 15 to 50 wires/inch and having wires with a diameter of between about 5 to 10 mils, the mesh having a front surface substantially covering the second surface of the pad, and having a back surface;

a plastic foam cover adapted to contact the back surface of the wire mesh backing and having a hole exposing at least a part of the wire mesh backing;

an insulated wire having a first exposed end which is adapted for insertion into the hole in the plastic foam cover, and electrically coupling to the exposed part of the wire mesh backing; and

a wire retainer adapted to be placed over the hole in the plastic foam cover after the wire has been inserted, and adhered to the plastic foam cover.

2. A non-invasive radiolucent electrode comprising:

at least one pad having a first surface adapted to be placed in contact with a patient'"'"'s skin, and having a second surface;

a conductive backing for the pad configured to be radiolucent and capable of conducting energy sufficient for defibrillation, and to substantially cover the second surface of the pad; and

means for coupling said conductive backing to a source of energy.

3. The electrode of claim 2 wherein said backing is configured to be a wire backing having between about 15-50 wires/inch.

4. The electrode of claim 2 wherein said backing is configured to be a wire backing having between about 20-40 wires/inch.

5. The electrode of claim 2 wherein said backing is made of stainless steel.

6. The electrode of claim 2 wherein said backing is comprised of wires having a diameter of between about 5-10 mils.

7. The electrode of claim 2 wherein said backing is comprised of wires having a diameter less than about 9 mils.

8. The electrode of claim 2 wherein said backing has a percentage of open space which is greater than about 50%.

9. The electrode of claim 2 wherein said backing is embedded in a low-impedance conductive rubber.

10. The electrode of claim 2 wherein said backing has an outside edge which is covered by a mylar ring.

11. The electrode of claim 2 wherein the first surface of said pad has an area greater than about 25 sq. cm.

12. The electrode of claim 2 wherein said electrical coupling means is adapted to electrically couple said mesh backing to a defibrillator.

13. The electrode of claim 2 wherein said electrical coupling means is adapted to electrically couple said mesh backing to external pacing means.

14. The electrode of claim 2 wherein said electrical coupling means is adapted to electrically couple said mesh backing to an ECG monitor.

15. The electrode of claim 2 wherein said pad is made of a conductive polymer.

16. The electrode of claim 2 wherein said pad is made of hydrogel.

17. A cardiac system comprising:

at least a pair of electrodes wherein at least a first one of said electrodes is non-invasive, and wherein said first electrode comprises at least one pad having a first surface adapted to be placed in contact with a patient'"'"'s skin, nd having a second surface, said electrode further comprising a conductive backing configured to be radiolucent and capable of conducting energy sufficient for defibrillation, and substantially cover said second surface of said pad;

a source of energy; and

means for coupling said source to said backing.

18. The cardiac system of claim 17 wherein said source of energy comprises external pacing means for generating first electrical impulses adapted to pace the patient'"'"'s heart.

19. The cardiac system of claim 17 wherein said source of energy comprises a defibrillator for generating second electrical impulses adapted to defibrillate the patient'"'"'s heart.

20. The cardiac system of claim 19 wherein said defibrillator includes depressible defibrillator paddles adapted to externally deliver said second electrical impulses when the paddles are depressed and said coupling means includes a shock plate configured with paddle wells which are adapted so that said defibrillator paddles fit snugly into said wells.

21. The cardiac system of claim 19 wherein said coupling means further comprises:

a connector adapted to electrically couple said mesh backing to said defibrillator by bypassing any defibrillator paddles included in said defibrillator; and

means for causing said defibrillator to externally deliver said second electrical impulses under operator control.

22. The cardiac system of claim 17 further comprising ECG monitoring means for receiving electrical impulses from the patient'"'"'s heart, and said coupling means is further adapted to electrically couple said monitoring means to said backing.

23. The cardiac system of claim 17 wherein said source comprises:

external pacing means for producing first electrical impulses adapted to pace the patient'"'"'s heart; and

a defibrillator for producing second electrical impulses adapted to defibrillate the patient'"'"'s heart;

wherein said coupling means further comprises means for delivering a selected one of said first and said second electrical impulses to said backing under operator control.

24. The cardiac system of claim 23 further comprising ECG monitoring means for receiving electrical impulses from the patient'"'"'s heart, wherein said electrical coupling means is further adapted to couple said monitoring means to said mesh backing.

25. A process for stimulating a patient'"'"'s heart utilizing a non-invasive radiolucent electrode comprising the steps of:

configured the electrode to have at least one pad;

contacting the patient'"'"'s skin with a first surface of said at least one electrode pad, said at least one pad also having a second surface;

substantially covering the second surface of the at least one pad with a conductive backing configured to be radiolucent and capable of conducting defibrillating energy;

delivering energy to the backing of the at least one pad; and

imaging any of the patient'"'"'s internal organs while said first surface of said at least one pad is contacting the patient'"'"'s skin.

26. The process of claim 25 wherein said delivering step comprises delivering electrical impulses adapted to defibrillate the patient'"'"'s heart to the backing of the at least one pad.

27. The process of claim 25 wherein said delivering step comprises delivering electrical impulses adapted to pace the patient'"'"'s heart to the backing of the at least one pad.

28. The processes of claim 25 further comprising receiving electrical impulses from the patient'"'"'s heart through said mesh backing for use in ECG monitoring.

29. The process of claim 25 further comprising the step of configuring said backing to be a wire backing having between about 15-50 wires/inch.

30. The process of claim 25 further comprising the step of configuring said backing to be a wire backing having between about 20-40 wires/inch.

31. The process of claim 25 further comprising the step of configuring said backing to be made of stainless steel.

32. The process of claim 25 further comprising the step of configuring said backing to a wire backing comprising wires having a diameter of between about 5-10 mils.

33. The process of claim 25 further comprising the step of configuring said backing to comprise a wire backing comprising wires having a diameter of less than about 9 mils.

34. The process of claim 25 further comprising the step of configuring said backing to have a percentage of open space of greater than about 50%.

35. The process of claim 25 further comprising the step of embedding the backing in a low-impedance conductive rubber.

36. The process of claim 25, wherein said backing has an outside edge, further comprising covering the outside edge with a mylar ring.

37. The process of claim 25 further comprising configuring the first surface of said pad to have an area greater than about 25 sq. cm.

38. A process comprising the steps of:

providing a non-invasive radiolucent electrode capable of conducting defibrillating energy and having at least one pad;

contacting a patient'"'"'s skin with a surface of said pad;

delivering electrical impulses, determined appropriate to defibrillate the patient'"'"'s heart, to said patient through said pad; and

imaging any of the patient'"'"'s internal organs while said pad is contacting the patient'"'"'s skin.