Claims
- 1. Apparatus for providing an ECG signal and detecting baseline shift in said ECG signal comprising,
- a first multielement electrode means having elements closely spaced but insulatedly separated for connection to a first surface portion of a patient, the ECG.potential between said elements being negligible,
- a second multielement electrode means having elements closely spaced but insulatedly separated for connection to a second surface portion of said patient, the ECG potential between said elements being negligible,
- first means for differentially combining the potentials of one element of said first multielement electrode means and one element of said second multielement electrode means for providing a first ECG signal,
- second means for differentially combining the potentials of another element of said first multielement electrode means and another element of said second multielement electrode means for providing a second ECG signal,
- and means for differentially combining said first and second ECG signals to provide an artifact signal representative of baseline shift in said ECG signals.
- 2. Apparatus in accordance with claim 1 in which said first multielement electrode means is spaced from said second multielement electrode means by a distance significantly greater than the distance between elements of each of said multielement electrode means.
- 3. Apparatus in accordance with claim 1 further comprising a third electrode means at a third surface portion of said patient wherein each of said first and second differential combining means includes a common input connected to said third electrode means.
- 4. Apparatus in accordance with claim 1 wherein the spacing between said elements in each of said first and second multielement electrode means is less than one inch.
- 5. Apparatus in accordance with claim 1 further comprising means for combining said first and second ECG signals.
- 6. A method of providing an ECG signal and detecting baseline shift in said ECG signal comprising the steps of,
- positioning first and second closely spaced but insulatedly separated electrode portions in contact with a first surface portion of a patient so that in the absence of baseline shift the ECG potential therebetween is negligible, there being substantially a first ECG potential on both said electrode portions,
- positioning third and fourth closely spaced but insulatedly separated electrode portions in contact with a second surface portion of said patient so that in the absence of baseline shift the ECG potential therebetween is negligible, there being substantially a second ECG potential on both said electrode portions,
- differentially combining the potential of one of said first and second electrode portions with the potential of one of said third and fourth electrode portions to provide a first ECG signal,
- differentially combining the potential of the other of said first and second electrode portions with the potential of the other of said third and fourth electrode portions to provide a second ECG signal,
- and differentially combining said first and second ECG signals to provide an artifact signal representative of baseline shift in said ECG signals.
REFERENCE TO PRIOR COPENDING APPLICATION
This is a continuation-in-part of application Ser. No. 754,538, filed Dec. 27, 1976 now U.S. Pat. No. 4112,930.
US Referenced Citations (6)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
754538 |
Dec 1976 |
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