Blood-pressure determining apparatus

• US 6,869,403 B2
• Filed: 02/24/2003
• Issued: 03/22/2005
• Est. Priority Date: 06/20/2002
• Status: Expired due to Fees

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Colin Medical Technology Corporation (Omron Corporation)
• Inventors: Ogura, Toshihiko, Narimatsu, Kiyoyuki, Tampo, Akira
• Primary Examiner(s): Nasser, Robert L.
• Application Number:
  US10/370,691
• Publication Number:
  US 20030236465A1
• Time in Patent Office: 757 Days
• Field of Search: 600/490, 600493-496, 600/500, 600/485
• US Class Current: 600/500
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 2562/043 in a linear array
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence

Abstract

A blood-pressure estimating apparatus, including a pulse-wave detecting device which detects a pulse wave from a portion of a living subject, a blood-pressure measuring device which includes an inflatable cuff adapted to be worn on the portion of the subject and measures, with the cuff, a diastolic blood pressure and a systolic blood pressure of the portion of the subject, and a mean-blood-pressure estimating device which converts, based on a minimum magnitude and a maximum magnitude of the pulse wave detected by the pulse-wave detecting device and the diastolic and systolic blood pressure measured by the blood-pressure measuring device, a magnitude of a gravity center of an area defined by the pulse wave into an estimated mean blood pressure of the portion of the subject.

Claims

1. A blood-pressure estimating apparatus, comprising:

a first-pulse-wave detecting device which detects a first pulse wave from a first portion of a living subject;

a blood-pressure measuring device which includes an inflatable cuff adapted to be worn on the first portion of the subject and measures, with the cuff, a diastolic blood pressure and a systolic blood pressure of the first portion of the subject;

a mean-blood-pressure estimating means for converting, based on a minimum magnitude and a maximum magnitude of the first pulse wave detected by the first-pulse-wave detecting device and the diastolic blood pressure and the systolic blood pressure measured by the blood-pressure measuring device, a magnitude of a gravity center of an area defined by the first pulse wave into an estimated mean blood pressure of the first portion of the subject;

a second-pulse-wave detecting device which detects a second pulse wave from a second portion of the subject; and

a systolic-blood-pressure estimating means for converting, based on the diastolic blood pressure measured by the blood-pressure measuring device and the mean blood pressure estimated by the mean-blood-pressure estimating means, a maximum magnitude of the second pulse wave detected by the second-pulse-wave detecting device into an estimated systolic blood pressure of the second portion of the subject.

2. A blood-pressure estimating apparatus according to claim 1, wherein the first portion and the second portion of the subject are a brachial portion and a cervical portion of the subject, respectively.

3. An apparatus according to claim 1, wherein the second-pulse-wave detecting device comprises a pressure-pulse-wave sensor which is adapted to be pressed against an artery of the second portion of the subject and detects, as the second pulse wave, a pressure pulse wave produced from the artery.

4. An apparatus according to claim 1, further comprising a display device which displays at least one of the mean blood pressure estimated by the mean-blood-pressure estimating means and the systolic blood pressure estimated by the systolic-blood-pressure estimating means.

5. A blood-pressure estimating apparatus, comprising:

a first-pulse-wave detecting device which detects a first pulse wave from a first portion of a living subject;

a blood-pressure measuring device which includes an inflatable cuff adapted to be worn on the first portion of the subject and measures, with the cuff, a mean blood pressure and a systolic blood pressure of the first portion of the subject;

a diastolic-blood-pressure estimating means for converting, based on an area-gravity-center magnitude and a maximum magnitude of the first pulse wave detected by the first-pulse-wave detecting device and the mean blood pressure and the systolic blood pressure measured by the blood-pressure measuring device, a minimum magnitude of the first pulse wave into an estimated diastolic blood pressure of the first portion of the subject;

a second-pulse-wave detecting device which detects a second pulse wave from a second portion of the subject; and

a systolic-blood-pressure estimating means for converting, based on the mean blood pressure measured by the blood-pressure measuring device and the diastolic blood pressure estimated by the diastolic-blood-pressure estimating means, a maximum magnitude of the second pulse wave detected by the second-pulse-wave detecting device into an estimated systolic blood pressure of the second portion of the subject.

6. A blood-pressure estimating apparatus according to claim 5, wherein the first portion and the second portion of the subject are a brachial portion and a cervical portion of the subject, respectively.

7. An apparatus according to claim 5, wherein the second-pulse-wave detecting device comprises a pressure-pulse-wave sensor which is adapted to be pressed against an artery of the second portion of the subject and detects, as the second pulse wave, a pressure pulse wave produced from the artery.

8. An apparatus according to claim 5, further comprising a display device which displays at least one of the diastolic blood pressure estimated by the diastolic-blood-pressure estimating means and the systolic blood pressure estimated by the systolic-blood-pressure estimating means.