Device for monitoring measurement electrodes, devised for picking up physiological measurement signals, and their leads
First Claim
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1. A device for obtaining and measuring physiological measurement signals comprising:
- a plurality of measurement electrodes and a neutral electrode adapted for attachment to a patient for picking up physiological measurement signals from said patient, each electrode being connected to an electrode lead, and means for monitoring said electrodes and said leads for faults during pick-up of said measurement signals comprising a plurality of measurement amplifiers respectively connected to said leads and each amplifier having an output, said amplifiers being arranged in two groups, each group containing at least one of said amplifiers, a noise suppression amplifier having a first input connected only to the outputs of a first of said two groups of amplifiers, and test signal generator means for generating a first alternating current signal through an input impedance and an associated electrode impedance of each of the amplifiers in a second of said two groups of measurement amplifiers, and for generating a second alternating current through the input impedance and associated electrode impedance of each of said amplifiers in said first group, and means for measuring voltages generated by said two alternating current signals.
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Abstract
In a device for monitoring measurement electrodes, attached to a patient in order to pick up physiological measurement signals, and a neutral electrode and associated leads at the same time as physiological measurement signals are picked up, each measurement electrode is connected to an input terminal on its associated measurement amplifier. A test signal generator is arranged to generate a pure AC signal, without any direct current component, across the neutral electrode attached to a patient during the pickup of measurement signals.
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13 Claims
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1. A device for obtaining and measuring physiological measurement signals comprising:
a plurality of measurement electrodes and a neutral electrode adapted for attachment to a patient for picking up physiological measurement signals from said patient, each electrode being connected to an electrode lead, and means for monitoring said electrodes and said leads for faults during pick-up of said measurement signals comprising a plurality of measurement amplifiers respectively connected to said leads and each amplifier having an output, said amplifiers being arranged in two groups, each group containing at least one of said amplifiers, a noise suppression amplifier having a first input connected only to the outputs of a first of said two groups of amplifiers, and test signal generator means for generating a first alternating current signal through an input impedance and an associated electrode impedance of each of the amplifiers in a second of said two groups of measurement amplifiers, and for generating a second alternating current through the input impedance and associated electrode impedance of each of said amplifiers in said first group, and means for measuring voltages generated by said two alternating current signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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