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Oscillometric-type blood pressure measuring apparatus

  • US 5,267,567 A
  • Filed: 07/09/1992
  • Issued: 12/07/1993
  • Est. Priority Date: 07/15/1991
  • Status: Expired due to Term
First Claim
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1. An oscillometric-type automatic blood pressure measuring apparatus, comprising:

  • pressure means for pressing a body portion of a living subject with a pressure;

    sensor means for detecting a pulse corresponding to a heartbeat of a living subject;

    oscillometric-type blood pressure measuring means operating in each of a plurality of periodic measurement cycles, for (a) occluding an arterial vessel of said subject by increasing the pressure of said pressure means, (b) reading through said pulse sensor means, a series of pulses of a first pulse wave transmitted from said arterial vessel to said pressure means while reducing the increased pressure of said pressure means and (c) determining a first systolic blood pressure of said subject based on variation in amplitude of said series of pulses of said first pulse wave;

    display means for indicating the first systolic blood pressure value measured by said oscillometric-type blood pressure measuring means;

    pulse wave detecting means disposed downstream of said pressure means with respect to said arterial vessel, for detecting a series of pulses of a second pulse wave produced from a portion of said arterial vessel located downstream of said pressure means;

    first determining means for determining, as an initial-pulse detection pressure, a pressure of said pressure means at a time when said pulse wave detecting means detects an initial pulse of said second pulse wave after said oscillometric-type blood pressure measuring means commences to reduce the pressure of said pressure means in said each measurement cycle;

    second determining means for determining, in a current measurement cycle of said oscillometric-type blood pressure measuring means, a second systolic blood pressure of said subject based on an initial-pulse detection pressure determined by said first determining means in said current measurement cycle and at least one first systolic blood pressure measured by said oscillometric-type blood pressure measuring means in at least one measurement cycle prior to said current measurement cycle; and

    said display means for indicating the second systolic blood pressure value determined by said second determining means in said current measurement cycle, before said oscillometric-type blood pressure measuring means determines a first systolic blood pressure of said subject in said current measurement cycle.

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