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

  • US 20140276145A1
  • Filed: 06/02/2014
  • Published: 09/18/2014
  • Est. Priority Date: 06/12/2007
  • Status: Active Grant
First Claim
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1. A system for measuring a blood pressure value from a patient, comprising:

  • (a) a first sensor configured to generate a first time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart;

    (b) a second sensor configured to generate a second time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart;

    (c) a third sensor configured to generate a third time-dependent waveform indicative of pressure applied to a patient'"'"'s arm; and

    (d) a processing component configured to be worn on the patient'"'"'s body and comprising a microprocessor and a serial transceiver, the processing component programmed to;

    (i) communicate through a cable worn on the patient'"'"'s body with a microprocessor and serial transceiver comprised by the first sensor to receive a digitized version of the first time-dependent waveform;

    (ii) communicate with a microprocessor and serial transceiver comprised by the third sensor to receive a digitized version of the third time-dependent waveform;

    (iii) calculate a pulse transit time calculated using a time difference between time-dependent features in digitized versions of the first and second time-dependent waveforms;

    (iv) calculate a calibration from a relationship between pulse transit time and blood pressure combined with pressure values corresponding to at least one of systolic, diastolic, and mean arterial blood pressure, the calibration and pressure values determined from a digitized version of the third time-dependent waveform; and

    (v) calculate the blood pressure value from the pulse transit time and the calibration.

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