Oscillometric-type blood pressure measuring apparatus
First Claim
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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Abstract
An oscillometric-type automatic blood pressure measuring apparatus, including a pressure device such as a cuff, an oscillometric-type blood pressure measuring device for (a) occluding an artery of a patient by increasing the cuff pressure, (b) detecting a first pulse wave transmitted from the artery to the cuff by reducing the increased cuff pressure, and (c) determining a first systolic blood pressure of the patient based on variation in amplitude of successive pulses of the first pulse wave, a display for indicating the determined first systolic blood pressure, a detecting device disposed downstream of the cuff, for detecting a second pulse wave produced from a portion of the artery located downstream of the cuff, a first determining device for determining, as an initial-pulse detection pressure, a cuff pressure at the time of detection of an initial pulse of the second pulse wave after the commencement of reduction of the cuff pressure in each of periodic measurement cycles, a second determining device for determining, in a current measurement cycle, a second systolic blood pressure of the patient based on an initial-pulse detection pressure determined in the current cycle and one or more first systolic blood pressures measured in one or more cycles prior to the current cycle, the display means indicating the second systolic blood pressure value before a first systolic blood pressure is determined and displayed in the current cycle.
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Citations
14 Claims
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1. An oscillometric-type automatic blood pressure measuring apparatus, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification