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.
Claims20
An apparatus for measuring 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 the patient's skin;
- 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 first and second switch in electrical communications with the distal ends of the first and second high resistance passive resistors, respectively;
- a capacitor electrically connected in parallel between the distal ends of the first and second high resistance passive resistors and the first and second switches;
- and
- a differential amplifier whose inputs are derived from the first and second switches;
- wherein, the switches are configured to open and close so as to charge and discharge the capacitor, respectively after a predetermined time constant period and the electrical pathways from the first and second lead electrodes to the amplifier are DC coupled.
A method for measuring lead-off detection and biopotential of a patient comprising:
- providing a first lead electrode and second lead electrode, the first and second lead electrodes configured to make direct electrical contact with the patient's skin;
- 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;
- disposing a first and second switch between the distal ends of the first and second high resistance resistors, respectively and a current amplifier;
- switching the first and second switches to a closed position;
- DC coupling both electrical pathways from the first and second lead electrodes to the amplifier;
- measuring the current from the output of the current amplifier;
- and
- calculating a patient's biopotential at least based on a measured output of the current amplifier.
A system for measuring lead-off detection and biopotential of a patient comprising:
- means for providing a first lead electrode and second lead electrode, the first and second lead electrodes configured to make direct electrical contact with the patient's skin;
- a circuit comprising:
- first means for resisting current and in electrical communication with the first lead electrode;
- second means for resisting current and in electrical communication with the second lead electrode;
- means for storing charge from the first and second means for resisting current;
- means for amplifying the current from the means for storing charge;
- means for switching current on and off between the distal ends of the first and second means for resisting current and means for amplifying the current;
- means for measuring the current from the output of the means for amplifying;
- and
- means for calculating a patient's biopotential at least based on the measured output of the means for amplifying.
Dependencies are inferred from the claim text.