Biopotential measurement system and apparatus
AssigneeAnalog Devices, Inc.
InventorShrenik Deliwala
Life of this patent
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Abstract
System and apparatus for measuring biopotential and implementation thereof. A device for mitigating electromagnetic interference (EMI) thereby increasing signal-to-noise ratio is disclosed. Specifically, the present disclosure relates to an elegant, novel circuit for measuring a plurality of biopotentials in useful in a variety of medical applications. This allows for robust, portable, low-power, higher S/N devices which have historically required a much bigger footprint.
Claims18
A method for detecting lead-off detection while measuring a biopotential of a patient comprising, the method comprising:
- providing a first lead electrode, second lead electrode, and third lead electrode, the first, second and third lead electrodes configured to make direct electrical contact with a skin of the patient;
- electrically connecting a proximal end of a first high resistance resistor to the first lead electrode;
- electrically connecting a proximal end of a second high resistance resistor to the second lead electrode;
- applying a current to the third lead electrode;
- DC coupling both electrical pathways from the first and second lead electrodes to a current amplifier;
- measuring an average current in a given time interval from an output of the current amplifier by charging a capacitor disposed between distal ends of the first and second high resistance resistors;
- and
- determining lead-off detection of at least one of the first, second and third lead electrodes at least based on a measured output of the current amplifier.
An apparatus for lead-off detection and biopotential of a patient comprising:
- a first lead electrode electrically connected in series to a first high resistance passive resistor at a proximal end of the first high resistance passive resistor, the first lead electrode configured to make direct electrical contact with a skin of the patient;
- a second lead electrode electrically connected in series to a second high resistance passive resistor at a proximal end of the second high resistance passive resistor, the second lead electrode configured to make direct electrical contact with the patient's skin;
- a differential amplifier whose inputs are derived distal ends of the first and second high resistance passive resistors, respectively;
- a current sensor configured to measure an average current in a given time interval from an output of the differential amplifier by charging a capacitor disposed between the distal ends of the first and second high resistance resistors;
- a third lead electrode configured to make direct electrical contact with the skin of the patient;
- a circuit configured to apply a current to the third lead electrode.
An apparatus for detecting lead-off detection while measuring a biopotential of a patient comprising, the apparatus comprising:
- means for providing a first lead electrode, second lead electrode, and third lead electrode, the first, second and third lead electrodes configured to make direct electrical contact with a skin of the patient;
- means for electrically connecting a proximal end of a first high resistance resistor to the first lead electrode;
- means for electrically connecting a proximal end of a second high resistance resistor to the second lead electrode;
- means for applying a current to the third lead electrode;
- means for DC coupling both electrical pathways from the first and second lead electrodes to means for amplifying current;
- means for measuring an average current in a given time interval from an output of the means for amplifying current by charging a capacitor disposed between distal ends of the first and second high resistance resistors;
- and
- means for determining lead-off detection of at least one of the first, second and third lead electrodes at least based on a measured output of the current amplifier.
Dependencies are inferred from the claim text.