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MULTI-SENSOR ARRAY FOR MEASURING BLOOD PRESSURE

  • US 20080312542A1
  • Filed: 06/13/2008
  • Published: 12/18/2008
  • Est. Priority Date: 06/13/2007
  • Status: Abandoned Application
First Claim
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1. A sensor for monitoring a patient'"'"'s blood pressure, the sensor comprising a housing unit configured to be worn on a patient'"'"'s arm, the housing unit having a back surface and comprising:

  • a pair of electrodes mounted on said back surface and positioned to contact the patient'"'"'s skin to generate electrical signals when the housing is worn on the patient'"'"'s arm;

    an optical system mounted on said back surface and comprising at least one light source that emits optical radiation near 570 nm and at least one photodetector, wherein the at least one light source and the at least one photodetector are positioned to be adjacent to the patient'"'"'s skin when the housing is worn on the patient'"'"'s arm, wherein optical system is configured to generate an optical signal by detecting optical radiation emitted by the at least one light source and reflected from blood vessels underneath the patient'"'"'s skin;

    a first amplifier configured to receive the electrical signals from the electrodes and generate an analog electrical waveform therefrom;

    a second amplifier configured to receive the optical signal from the photodetector and generate an analog optical waveform therefrom;

    analog-to-digital converter circuitry configured to receive the analog electrical waveform and generate a digital electrical waveform therefrom and to receive the analog optical waveform and generate a digital optical waveform therefrom; and

    a processor programmed to receive the digital electrical and optical waveforms and determine a pulse transit time for the patient which is a measure of a separation in time of a first feature of the digital electrical waveform and a second feature of the digital optical waveform and to use the pulse transit time to determine a blood pressure value for the patient.

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