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BODY-WORN SYSTEM FOR MEASURING CONTINUOUS NON-INVASIVE BLOOD PRESSURE (cNIBP)

  • US 20100160798A1
  • Filed: 12/30/2009
  • Published: 06/24/2010
  • Est. Priority Date: 06/12/2007
  • Status: Active Grant
First Claim
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1. A method for monitoring a blood pressure value from a patient, comprising:

  • (a) applying a variable pressure to the patient'"'"'s arm using a pressure-delivery system;

    (b) detecting a time-dependent pressure waveform representing the pressure applied to the patient'"'"'s arm;

    (c) detecting a first time-dependent waveform comprising a first feature induced by the patient'"'"'s heartbeat with a first sensor configured to attach to the patient;

    (d) detecting a second time-dependent waveform comprising a second feature induced by the patient'"'"'s heartbeat with a second sensor configured to attach to the patient;

    (e) determining a pulse transit time from a separation in time between the first feature and the second feature;

    (f) determining a variation in the pulse transit time as a function of the pressure applied to the patient'"'"'s arm;

    (g) processing the variation in pulse transit time to determine a relationship between pulse transit time and blood pressure;

    (h) digitally filtering a portion of the time-dependent pressure waveform to determine a processed pressure waveform;

    (i) analyzing the processed pressure waveform to determine values for systolic blood pressure, diastolic blood pressure, and mean arterial pressure; and

    (j) analyzing a pulse transit time, the relationship between pulse transit time and blood pressure, and blood pressure values determined from the processed pressure waveform to determine a blood pressure value when no pressure is applied to the patient'"'"'s arm with the pressure delivery system.

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