Patient electrode impedance measurement
First Claim
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1. An apparatus that determines a connection quality of an electrode to a patient, the apparatus comprising:
- a current source connected to a first electrode;
a switch connected to a second electrode for selectively connecting the second electrode to ground; and
a processor connected to the first electrode and a third electrode, said processor detecting a voltage difference between the first electrode and the third electrode upon application of a current to the first electrode by said current source to determine connection quality data for the first electrode,wherein said apparatus is connected to electrodes of an ECG monitor and said processor disables a drive electrode of the ECG monitor prior to measuring connection quality data.
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Abstract
An apparatus and method is provided that determines a connection quality of an electrode to a patient. A current source is connected to a first electrode and a switch is connected to a second electrode for selectively connecting the second electrode to ground. A processor is connected to the first electrode and a third electrode and the processor detects a voltage difference between the first electrode and the third electrode upon application of a current to the first electrode by the current source to determine connection quality data for the first electrode.
10 Citations
17 Claims
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1. An apparatus that determines a connection quality of an electrode to a patient, the apparatus comprising:
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a current source connected to a first electrode; a switch connected to a second electrode for selectively connecting the second electrode to ground; and a processor connected to the first electrode and a third electrode, said processor detecting a voltage difference between the first electrode and the third electrode upon application of a current to the first electrode by said current source to determine connection quality data for the first electrode, wherein said apparatus is connected to electrodes of an ECG monitor and said processor disables a drive electrode of the ECG monitor prior to measuring connection quality data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An ECG monitoring apparatus that that determines a connection quality of an electrode connected to a patient, the apparatus comprising:
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a plurality of electrodes coupled to a patient, each of said plurality of electrodes sensing electrical impulses representing at least one patient parameter from the patient; a current source selectively connectable to the plurality of electrodes that selectively applies a current to any of the plurality of electrodes; a processor that receives electrical impulses from the patient via the plurality of electrodes and calculates connection quality data for respective ones of the plurality of electrodes; a plurality of switches, each switch connected to a respective one of said plurality of electrodes and said processor and movable between a first position connecting a respective electrode to said processor and a second position connecting said respective electrode to ground;
wherein a first switch connects an electrode being monitored to said processor, and a second switch connects a second electrode to said processor; and
at least one other of said plurality of switches connects respective ones of said plurality of electrodes to ground, and said processor detects a voltage difference between said first electrode and said second electrode upon application of a current to said first electrode by said current source to determine connection quality data for said first electrode which is based on an impedance measurement between one of the plurality of electrodes and the patient; anda drive electrode that is disabled by the processor prior to calculating connection quality data.
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13. A method of determining a connection quality of an electrode connected to a patient, the method comprising:
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connecting a first electrode of a plurality of electrodes to (i) a processor, (ii) a first non-inverting input of a first amplifier, and (iii) a second non-inverting input of a second amplifier; connecting a second electrode of a plurality of electrodes to (i) ground, (ii) a first inverting input of the first amplifier, and (iii) a third inverting input of a third amplifier; connecting a third electrode of a plurality of electrodes to (i) the processor, (ii) a second inverting input of the second amplifier, and (iii) a third non-inverting input of the third amplifier; applying a current from a current source to the first electrode; detecting a voltage difference between the first electrode and a third electrode; and determining connection quality data of the first electrode using the voltage difference between the first and third electrode. - View Dependent Claims (14, 15, 16, 17)
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Specification