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Health monitoring system

  • US 10,357,180 B2
  • Filed: 01/16/2014
  • Issued: 07/23/2019
  • Est. Priority Date: 01/16/2014
  • Status: Active Grant
First Claim
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1. A health monitoring system for determining glucose levels in a subject, the system comprising:

  • an implantable sensor configured to measure impedance within a body tissue of the subject resulting from an electrical current flowing through said body tissue using a first pair of injecting electrodes and a second pair of sensing electrodes, the electrodes of the first pair of injecting electrodes and electrodes of the second pair of sensing electrodes being arranged physically separated and at a distance from one another in a row, the second pair of sensing electrodes being arranged in between the first pair of injecting electrodes, wherein current is injected into body tissue from the first pair of electrodes, the injection electrodes, and flows through the body tissue thereby causing a voltage between the second pair of electrodes, the sensing electrodes, wherein the body tissue is sub-dermal or subcutaneous tissue of said subject, the sensor including;

    a current signal output circuit operatively connected to a microcontroller and the injection electrodes and being configured to provide electrical current at predetermined frequencies to the injection electrodes,a detector operatively connected to the second pair of sensing electrodes and configured to receive a voltage detected by the second pair of sensing electrodes, wherein the detector is configured to measure the impedance of the body tissue based on the current flowing through the tissue between the first pair of injection electrodes and the voltage detected by the second pair of sensing electrodes,wherein the current signal output circuit and the first pair of injecting electrodes constitute a separate circuit from the second pair of sensing electrodes and the detector,the microcontroller being operatively connected to the detector and being configured to receive impedance signals from the detector and to provide control signals to the current signal output circuit,a powering and communication circuit having a coil configured to be powered by an electromagnetic field and to communicate with external devices;

    wherein the system further includes;

    a reader module including a coil configured to produce the electromagnetic field for powering the powering and communication circuit of the sensor and for communicating with the powering and communication circuit, the coil is connected to a power generator configured to generate current and voltage for the electromagnetic field, the reader module being configured to receive transmitted data from the sensor;

    a computing device comprising a display device, a processing device and at least one storage device, the computing device being configured to communicate with other devices via at least one wireless network and to monitor at least one physiological parameter based on measured impedance, wherein the reader module and the computing device are configured to communicate with each other;

    wherein the monitoring system is configured to determine a glucose level in the subject by correlating the measured impedance with a predetermined relationship between impedance and blood glucose levels;

    and wherein said detector is a I/Q (In-phase/Quadrature) demodulator consisting of one signal path for extraction of both the I and Q components, wherein a sensed voltage is received from said sensing electrodes as input and an output of said I/Q demodulator is at least one DC signal.

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