Measuring blood pressure

  • US 7,029,447 B2
  • Filed: 08/06/2003
  • Issued: 04/18/2006
  • Est. Priority Date: 08/09/2002
  • Status: Expired due to Fees
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First Claim
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1. A method for measuring non-invasively a blood pressure of a patient,the method comprising the steps of:

  • determining a mechanical heart beat starting time point from an impedance cardiogram signal,measuring the heart to peripheral site pulse beat transit time start point by measuring an ECG QRS-complex,adding correction to the ORS-complex signal by averaging a QRS to impedance cardiogram (ICE) waveform timing point,detecting a heart beat pulse arrival time at a peripheral site of the patient by using an optical plethysmographic sensor at the peripheral site,calculating a pulse wave transit time from the heart to the peripheral site by utilizing said mechanical starting point of the heart beat and said heart beat pulse arrival time,calculating an estimate of the blood pressure of the patient from said pulse wave transit time.

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