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Noise-immune blood pressure measurement technique and system

  • US 4,649,928 A
  • Filed: 10/21/1985
  • Issued: 03/17/1987
  • Est. Priority Date: 10/21/1985
  • Status: Expired due to Fees
First Claim
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1. A method for the non-invasive sensing of the diastolic and systolic blood pressures of a patient, said method comprising the steps of:

  • installing a proximal occlusion bladder and a distal sensing bladder on a limb of the patient;

    inflating said occlusion and sensing bladders;

    allowing said occlusion bladder to deflate controllably over time;

    monitoring a pressure in the sensing bladder;

    filtering out blood pulses from the monitored pressure to obtain a filtered pressure;

    determining when the filtered pressure in the sensing bladder reaches a minimum, and identifying the pressure in the occlusion bladder at that time as the systolic pressure;

    determining when the filtered pressure in the sensing bladder passes through an inflection point, and identifying the pressure in the occlusion bladder at that time as the mean arterial pressure; and

    calculating the diastolic pressure from said systolic and means arterial pressures.

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