Electrode systems and methods for reducing motion artifact

• US 20030171661A1
• Filed: 01/28/2003
• Published: 09/11/2003
• Est. Priority Date: 01/29/2002
• Status: Active Grant

• Current Assignee: Southwest Research Institute
• Original Assignee: Southwest Research Institute
• Inventors: Tong, David A.
• Granted Patent: US 6,912,414 B2
• Time in Patent Office: Days
• US Class Current: 600/300
• CPC Class Codes: A61B 2562/0219 Inertial sensors, e.g. accelerometers, gyroscopes, tilt switches
• CPC Class Codes: A61B 5/25 Bioelectric electrodes therefor
• CPC Class Codes: A61B 5/30 Input circuits therefor
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods

Abstract

An electrode system for reducing noise from an electronic signal, the system including an electrode that provides the electronic signal, and a sensor that senses motion and provides a motion signal. The electrode system includes a controller that determines a noise value based on an analysis of the motion signal, and subtracts the noise value from the electronic signal. The electrode system can reduce or eliminate motion artifact from an electronic signal that can result in misdiagnosis, prolong procedural duration and inappropriate treatment of a patient.

Claims

1. An electrode system for reducing motion artifact from an electronic signal, the system comprising:

an electrode that provides the electronic signal;

a sensor that senses motion and provides a motion signal; and

a controller that determines a noise value based on an analysis of the electronic signal and motion signal, and subtracts the noise value from the electronic signal.

2. The electrode system of claim 1, further comprising the electrode and the sensor coupled together and connected to a patch that is placed on the skin of a patient.

3. The electrode system of claim 1, wherein the sensor senses the motion in at least one dimension.

4. The electrode system of claim 1, wherein the controller is part of a patient monitoring system.

5. The electrode system of claim 4, the controller uses a noise cancellation circuit or routine to subtract the noise value from the electronic signal.

6. The electrode system of claim 1, further comprising a plurality of electrodes that produce a plurality of electronic signals that are differential physiological signals of a human being.

7. A method for reducing motion artifact from an electronic signal, the method comprising:

providing the electronic signal through an electrode;

sensing motion through a sensor;

providing a motion signal based on the sensing of the sensor; and

determining a noise value based on an analysis of the electronic signal and motion signal, and subtracting the noise value from the electronic signal.

8. The method of claim 7, further comprising coupling the electrode and the sensor together and connecting them to a patch that is placed on the skin of a patient.

9. The method of claim 7, further comprising sensing the motion in at least one dimension.

10. The method of claim 7, wherein a patient monitoring system determines the noise value based on the analysis of the electronic signal and motion signal, and subtracts the noise value from the electronic signal.

11. The method of claim 10, the patient monitoring system uses a noise cancellation circuit or routine to subtract the noise value from the electronic signal.

12. The method of claim 7, further comprising producing a plurality of electronic signals that are differential physiological signals of a human being.

13. A method for reducing motion artifact from differential electronic signals, the method comprising:

positioning at least two recording electrodes;

determining the differential electronic signals produced by the recording electrodes;

determining motion signals; and

analyzing the motion signals; and

determining noise values based on the analysis of the motion signals, and subtracting the noise values from the differential electronic signals.

14. The method of claim 13, further comprising determining the motion signals based on at least one dimension.

15. The method of claim 13, further comprising producing a plurality of differential signals that are physiological signals of a human being.