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1. (WO1997037719) BIOMEDICAL ELECTRODE WITH LOSSY DIELECTRIC PROPERTIES
注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

What is claimed is:

1. A biomedical electrode, comprising:
an electrically non-conductive backing;
a conductive plate contacting the electrically non-conductive backing;
a field of lossy dielectric material between the conductor plate and a surface of the electrode that can contact a body of a patient; and
a field of conductive adhesive in contact with both the conductive plate and the field of lossy dielectric material.

2. The biomedical electrode according to Claim 1 wherein the conductive plate has a body contacting portion and an extended tab and wherein the field of lossy dielectric material contacts a region adjacent an exterior edge of the body contacting portion of the conductive plate.

3. The biomedical electrode according to Claim 1 further comprising a second conductive plate, wherein the field of lossy dielectric material contacts only a portion of each of the conductive plates, and wherein
the field of conductive adhesive is in contact with the field of lossy dielectric material.

4. The biomedical electrode according to Claim 3 wherein the each of the conductive plates has a body contacting portion and an extended tab and wherein the field of lossy dielectric material contacts a region adjacent the outer edge of the body contacting portion of each conductive plate.

5. The biomedical electrode according to Claim 1 wherein the field of lossy dielectric material has performance parameters between the extremes of:
a resistive-type dispersive electrode that causes an edge effect at a periphery of a conductive surface; and a capacitive-type dispersive electrode that causes only capacitive flow between the conductive surface and the body of a patient

6. The biomedical electrode of Claim 5, the lossy dielectric material minimizes the maximum amount of temperature rise in tissue of a patient in contact with the biomedical electrode of a geometry compared with a resistive-type dispersive electrode of the same geometry.

7. The biomedical electrode of Claim 6, wherein the amount of tissue maximum temperature rise of less than about 6°C from beginning of usage with an electrosurgical generator when tested according to AAMI Standard Section 4.2.3.1 (1986).

8. The biomedical electrode of Claim 3, wherein two different fields of conductive adhesive contact the two different conductive plates.

9. The biomedical electrode of Claim 1, wherein regions of the electrode have a reactance per 129 cm2 ranging from about -0.5 Ω/ 129 cm2 to about -16 Ω/ 129 cm2 at an exterior edge on the electrode.

10. The biomedical electrode of Claim 1, wherein regions of the electrode have a tan δ ranging from about 0.14 to about 1.7 at an exterior edgeof the body contact portion on the biomedical electrode, measured at 500 kHz and a signal amplitude of 60 V (RMS).

11. The biomedical electrode of Claim 2, wherein the lossy dielectric material occupies an area of the body contact portion 22 ranging from about 5 % to about 70%.

12. The biomedical electrode of Claim 2, wherein the lossy dielectric material has a maximum impedance per 129 cm2 at the exterior edge of the body contact portion ranging from about 0 387 Ω/ 129 cm2 to about 20 Ω/ 129 cm2

13 The biomedical electrode of Claim 1, wherein the lossy dielectric material has a impedance/area of from about 0 387 Ω/ 129 cm2 to about 20 Ω/ 129 cm2at an exterior edge of the body contact portion; and a tan δ ranging from about 0 1 to about 1.7 at the exterior edge of the body contact portion on the biomedical electrode, measured at 500 kHz and a signal amplitude of 60 mV (RMS)

14. The biomedical electrode of Claim 1 , wherein the lossy dielectric material has a impedance/area of from about 1 Ω/ 129 cm2 to about 8 Ω/ 129 cm2at an exterior edge of the body contact portion; and a tan δ ranging from about 0.2 to about 0 7 at the exterior edge of the body contact portion on the biomedical electrode, measured at 500 kHz and a signal amplitude of 60 mV (RMS)

15. The biomedical electrode of Claim 1, wherein the field of lossy dielectric material is a sheet in the field of conductive adhesive.

16 The biomedical electrode of Claim 1, wherein the field of lossy dielectric material is a sheet on the field of conductive adhesive contacting skin

17 The biomedical electrode of Claim 1, wherein the field of lossy dielectric material is a portion of the electrically conductive surface altered to impart lossy dielectric properties

18. The biomedical electrode of Claim 1, wherein the field of lossy dielectric material is a portion of the field of conductive adhesive to impart lossy dielectric properties on a portion of the electrically conductive surface or in a portion of the field of conductive adhesive

19. The biomedical electrode of Claim 1, wherein the biomedical electrode is a dispersive electrode responsive to CQM monitoring

20. The biomedical electrode of Claim 1 , wherein the electrode is a cardiac stimulating electrode and delivers current into the patient.

21. The biomedical electrode of Claim 19, wherein the cardiac stimulating electrode is a defibrillation electrode, a cardioversion electrode, or a pacing electrode.

22. An electrosurgical system, comprising:
an electrosurgical generator and a biomedical electrode, wherein the biomedical electrode comprises an electrically non-conductive backing;
a conductive plate contacting the electrically non-conductive backing;
a field of lossy dielectric material; and
a field of conductive adhesive in contact with both the conductive plate and the field of lossy dielectric material.

23. A method of controlling the dielectric properties of a biomedical electrode, comprising the steps of:
(a) applying a lossy dielectric material to at least a portion of the electrode between a conductive surface and a surface of the electrode that contacts a patient;
(b) assembling remaining components of the electrode.

24. The method of Claim 23, wherein the step of applying comprises coating a portion of the conductive surface with the lossy dielectric material.

25. The method of Claim 23, wherein the step of applying comprises applying a field of lossy dielectric material as a sheet to a field of conductive adhesive at the surface that contacts a patient.

26. The method of Claim 23, wherein the step of applying comprises applying a field of lossy dielectric material as a portion of the electrically conductive surface to alter the electrically conductive surface to impart lossy dielectric properties.

27. The method of Claim 23, wherein the step of applying comprises applying a field of lossy dielectric material as a portion of a field of conductive adhesive to impart lossy dielectric properties on a portion of the electrically conductive surface or in a portion of the field of conductive adhesive.

28. The method of Claim 27, wherein the field of lossy dielectric material is applied in a manner to provide an electrical impedance gradient from a center of the body contact portion to exterior edge ranging from about 30% to about 90% of maximum impedance at the exterior edge.