Impedance measurement system
First Claim
1. A method of monitoring a condition of a plurality of electrodes used in the measurement of a biological signal, the method comprising:
- applying a first test signal having a first frequency to at least one of the plurality of electrodes and concurrently applying a second test signal having a second frequency different from the first frequency to at least one of the plurality of electrodes at a same time during which at least a portion of the first test signal is applied;
capturing the biological signal while applying the first and second test signals and generating an output signal that includes both the measured biological signal and the first and second test signals;
retrieving an output amplitude for each of the first and second test signals from the output signal;
calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the first and second test signals;
generating a quantitative indication of the condition of the plurality of electrodes based on the calculated estimated impedances for the plurality of electrodes; and
providing the quantitative indication of the condition of the plurality of electrodes to a user.
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Accused Products
Abstract
Systems and methods for monitoring the condition of electrodes used in biological signal measurement are provided. One method includes applying a first test signal having a first frequency to at least one of a plurality of electrodes and applying a second test signal having a second frequency to at least one of the plurality of electrodes. Both frequencies are below a frequency range associated with the biological signal. The method further includes capturing the biological signal while applying the plurality of test signals and generating an output signal that includes both the measured biological signal and the plurality of test signals. The method further includes retrieving an output amplitude for each of the plurality of test signals from the output signal and calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the plurality of test signals.
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Citations
20 Claims
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1. A method of monitoring a condition of a plurality of electrodes used in the measurement of a biological signal, the method comprising:
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applying a first test signal having a first frequency to at least one of the plurality of electrodes and concurrently applying a second test signal having a second frequency different from the first frequency to at least one of the plurality of electrodes at a same time during which at least a portion of the first test signal is applied; capturing the biological signal while applying the first and second test signals and generating an output signal that includes both the measured biological signal and the first and second test signals; retrieving an output amplitude for each of the first and second test signals from the output signal; calculating an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the first and second test signals; generating a quantitative indication of the condition of the plurality of electrodes based on the calculated estimated impedances for the plurality of electrodes; and providing the quantitative indication of the condition of the plurality of electrodes to a user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for monitoring a condition of a plurality of electrodes used in the measurement of a biological signal, the system comprising:
a circuit configured to; apply a first test signal having a first frequency to at least one of the plurality of electrodes and concurrently apply a second test signal having a second frequency different from the first frequency to at least one of the plurality of electrodes at a same time during which at least a portion of the first test signal is applied; capture the biological signal while applying the first and second test signals and generate an output signal that includes both the measured biological signal and the first and second test signals; retrieve an output amplitude for each of the first and second test signals from the output signal; calculate, for each electrode, a plurality of estimated impedance values over a measurement timeframe based on the retrieved output amplitudes of the first and second test signals; and calculate, for each electrode, an estimated impedance based on a combination of the plurality of estimated impedance values for the electrode. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system for measuring an electrocardiogram (ECG) signal, the system comprising:
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a plurality of electrodes; and a circuit comprising a microprocessor and a DC amplifier, wherein the circuit is configured to; apply a first test signal having a first frequency to at least one of the plurality of electrodes and concurrently apply a second test signal having a second frequency to at least one of the plurality of electrodes at a same time during which at least a portion of the first test signal is applied, wherein both the first frequency and the second frequency are below a frequency range associated with the ECG signal; capture the ECG signal while applying the first and second test signals and generate, using the DC amplifier, an output signal that includes both the measured ECG signal and the first and second test signals; retrieve an output amplitude for each of the first and second test signals from the output signal; and calculate an estimated impedance for each of the plurality of electrodes based on the retrieved output amplitudes of the first and second test signals. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification