Biopotential electrode sensory component

• US 6,434,420 B1
• Filed: 03/21/2000
• Issued: 08/13/2002
• Est. Priority Date: 01/31/2000
• Status: Expired due to Term

• Current Assignee: Integrated Biosensing Technologies
• Original Assignee: Integrated Biosensing Technologies
• Inventors: Taheri, Babak A.
• Primary Examiner(s): Shaver, Kevin
• Assistant Examiner(s): MARMOR II, CHARLES ALAN
• Application Number:
  US09/532,322
• Time in Patent Office: 875 Days
• Field of Search: 600/547, 600/509, 600/372, 600/391, 600/392, 600/395, 600/396, 600/300, 600/301, 607/149, 128/903
• US Class Current: 600/547
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/304 Switching circuits

Abstract

A method and apparatus for biopotential sensing and stimulation are provided including a sensory component, a biopotential sensor electrode, and a biopotential sensory electrode system. The sensory component includes a first layer of electrically conductive material coupled among a biopotential signal source and a dielectric layer. A second layer of electrically conductive material is coupled among the dielectric layer, resistive elements, a charge balancing current source and sink, and circuits of the associated biopotential electrode. The biopotential sensor electrode includes the sensory component, conditioning components, an interface, and a power source. Stimulation components may also be included to provide stimulation signals to the biopotential signal source. The interface transfers signals to external instrumentation using wireless or wired connections. The power source includes batteries, solar cells, and telemetry power sources. The biopotential sensory electrode system includes electrode arrays and a receiver section that transfers biopotential signals among the biopotential signal source and external instrumentation and equipment. A reference link among the sensor electrodes of an array is provided by a coupling that includes current injection to a surface of the biopotential signal source, or a common wire to all electrodes.

Claims

1. A biopotential electrode sensory component for sensing a biopotential of a patient, comprising:

a first layer of electrically conductive material coupled to a dielectric layer and adapted to engage the skin of the patient;

a second layer of electrically conductive material coupled to the dielectric layer; and

at least one resistive element, at least one charge balancing current source and sink and at least one biopotential electrode circuit coupled to the second layer of electrically conductive material.

2. The biopotential electrode sensory component of claim 1, wherein the at least one biopotential electrode circuit includes at least one component selected from a group consisting of high voltage protection circuitry, at least one bond, at least one metal layer, and a feedback amplifier.

3. The biopotential electrode sensory component of claim 2, wherein the at least one bond is selected from a group consisting of a permanent metallic bond and a snap connector.

4. The biopotential electrode sensory component of claim 1, wherein the first layer of electrically conductive material is coupled to the dielectric layer through a third layer of electrically conductive material and a first bond, wherein the second layer of electrically conductive material is coupled to the dielectric layer through a fourth layer of electrically conductive material and a second bond.

5. The biopotential electrode sensory component of claim 4, wherein the first bond and the second bond are selected from a group consisting of a permanent metallic bond and a snap connector.

6. The biopotential electrode sensory component of claim 1, wherein the dielectric layer comprises at least one material selected from a group consisting of Diamond Like Carbon (DLC) material, tantalum pentoxide, nitride, silicon nitride, oxide, and aluminum dioxide.

7. The biopotential electrode sensory component of claim 1, wherein the first layer and second layer of electrically conductive material comprise at least one material selected from a group consisting of stainless steel, platinum, gold, and silver silver-chloride.

8. The biopotential electrode sensory component of claim 1, wherein the first layer of electrically conductive material has a surface texture selected from a group consisting of smooth, rough, and bumped.

9. The biopotential electrode sensory component of claim 1, further comprising an electrical coupling to at least one interface selected from a group consisting of an analog interface and a digital interface.

10. The biopotential electrode sensory component of claim 1, further comprising an electrical coupling to at least one telemetry component, wherein the at least one telemetry component transfers biopotential signals and power between the biopotential electrode sensory component and external instrumentation.

11. The biopotential electrode sensory component of claim 1, further comprising an electrical coupling to at least one reference link that allows at least one biopotential sensor electrode associated with the biopotential electrode sensory component to be synchronized and referenced to a single potential, wherein the at least one reference link is provided by at least one coupling selected from a group consisting of a wired link, a telemetry link, and current injection to a skin surface of the patient.

12. A biopotential electrode sensory component for sensing a biopotential of a patient comprising:

a first layer of electrically conductive material coupled to a dielectric layer and voltage protection circuitry and adapted to engage the skin of the patient;

a second layer of electrically conductive material coupled to the dielectric layer; and

at least one biopotential electrode circuit and at least one charge balancing circuit coupled to the second layer of electrically conductive material.

13. The biopotential electrode sensory component of claim 12, wherein a third and fourth electrically conductive layer are coupled between the first layer of electrically conductive material and the dielectric layer using at least one bond.

14. The biopotential electrode sensory component of claim 13, wherein the at least one bond is selected from a group consisting of a permanent metallic bond and a snap connector.

15. The biopotential electrode sensory component of claim 13, wherein the third layer and fourth layer of electrically conductive material comprise at least one material selected from a group consisting of stainless steel, platinum, gold, and silver silver-chloride.

16. The biopotential electrode sensory component of claim 12, wherein the at least one biopotential electrode circuit includes a feed back amplifier.

17. The biopotential electrode sensory component of claim 12, wherein the dielectric layer comprises at least one material selected from a group consisting of Diamond Like Carbon (DLC) material, tantalum pentoxide, nitride, silicon nitride, oxide, and aluminum dioxide.

18. The biopotential electrode sensory component of claim 12, wherein the first layer and second layer of electrically conductive material comprise at least one material selected from a group consisting of stainless steel, platinum, gold, and silver silver-chloride.

19. The biopotential electrode sensory component of claim 12, wherein the first layer of electrically conductive material has a surface texture selected from a group consisting of smooth, rough, and bumped.

20. The biopotential electrode sensory component of claim 12, further comprising an electrical coupling to at least one interface selected from a group consisting of an analog interface and a digital interface.

21. The biopotential electrode sensory component of claim 12, further comprising an electrical coupling to at least one telemetry component, wherein the at least one telemetry component transfers biopotential signals and power between the biopotential electrode sensory component and external instrumentation.

22. The biopotential electrode sensory component of claim 12, further comprising an electrical coupling to at least one reference link that allows at least one biopotential sensor electrode associated with the biopotential electrode sensory component to be synchronized and referenced to a single potential, wherein the at least one reference link is provided by at least one coupling selected from a group consisting of a wired link, a telemetry link and current injection to a skin surface of the patient.

23. A method for collecting biopotential signals from a patient, comprising:

coupling a sensory component to a skin surface of the patient;

converting ionic potentials and electric fields received by the sensory component to electrical potentials;

minimizing effects of changing skin impedance on the electrical potentials using a sensor impedance in series with a skin impedance, wherein a magnitude of the sensor impedance is greater than a magnitude of the skin impedance;

minimizing direct current offset and motion artifacts of the electrical potentials using charge balancing; and

providing the electrical potentials to external instrumentation.

24. A computer readable medium containing executable instructions which, when executed in a processing system, causes the system to collect biopotential signals from a patient, the collection comprising:

coupling a sensory component to a skin surface of the patient;

converting ionic potentials and electric fields received by the sensory component to electrical potentials;

minimizing effects of changing skin impedance on the electrical potentials using a sensor impedance in series with a skin impedance, wherein a magnitude of sensor impedance is greater than a magnitude of the skin impedance;

minimizing direct current offset and motion artifacts of the electrical potentials using charge balancing; and

providing the electrical potentials to external instrumentation.

25. An electromagnetic medium containing executable instructions which, when executed in a processing system, causes the system to collect biopotential signals from a patient, the collection comprising:

coupling a sensory component to a skin surface of the patient;

converting ionic potentials and electric fields received by the sensory component to electrical potentials;

minimizing effects of changing skin impedance on the electrical potentials using a sensor impedance in series with a skin impedance, wherein a magnitude of the sensor impedance is greater than a magnitude of the skin impedance;

minimizing direct current offset and motion artifacts of the electrical potentials using charge balancing; and

providing the electrical potentials to external instrumentation.

26. A biopotential electrode sensory component for use on a patient, comprising:

means for coupling a sensor to a skin surface of the patient;

means for converting ionic potentials and electric fields received by the sensor to electrical potentials;

means for minimizing effects of changing skin impedance on the electrical potentials using an impedance in series with a skin impedance, wherein a magnitude of the impedance is greater than a magnitude of the skin impedance;

means for minimizing direct current offset and motion artifacts of the electrical potentials using charge balancing means; and

means for providing the electrical potentials to external instrumentation.