Augmentation-index measuring apparatus

• US 20030199773A1
• Filed: 01/27/2003
• Published: 10/23/2003
• Est. Priority Date: 04/17/2002
• Status: Active Grant

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Colin Corporation (Fukuda Denshi Company Limited)
• Inventors: Ogura, Toshihiko, Narimatsu, Kiyoyuki, Tampo, Akira
• Granted Patent: US 6,786,872 B2
• Time in Patent Office: Days
• US Class Current: 600/490
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives

Abstract

An augmentation-index measuring apparatus including a cuff which is adapted to be worn on a portion of a living subject to press the portion, an augmentation-index determining device for determining an augmentation index of the subject based on a cuff pulse wave obtained from the cuff, and a preliminary pressing device for preliminarily pressing, before the cuff pulse wave is obtained, for the determination of the augmentation index, from the cuff having a pulse-wave detection pressure, the portion of the subject using the cuff having a pressure higher than the pulse-wave detection pressure.

Claims

1. An augmentation-index measuring apparatus comprising:

a cuff which is adapted to be worn on a portion of a living subject to press said portion;

an augmentation-index determining means for determining an augmentation index of the subject based on a cuff pulse wave obtained from the cuff; and

a preliminary pressing means for preliminarily pressing, before the cuff pulse wave is obtained, for the determination of the augmentation index, from the cuff having a pulse-wave detection pressure, the portion of the subject using the cuff having a pressure higher than the pulse-wave detection pressure.

2. An apparatus according to claim 1, wherein the preliminary pressing means preliminarily presses the portion of the subject by carrying out a predetermined number of blood-pressure measurements using the cuff.

3. An apparatus according to claim 1, wherein the preliminary pressing means preliminarily presses the portion of the subject for a predetermined preliminary-pressing time before the cuff pulse wave is obtained for the determination of the augmentation index.

4. An apparatus according to claim 1, wherein the preliminary pressing means preliminarily presses the portion of the subject with a pressure higher than a systolic blood pressure of the subject.

5. An apparatus according to claim 1, wherein the preliminary pressing means finishes the preliminary pressing of the portion of the subject within five minutes before commencement of the obtaining of the cuff pulse wave for the determination of the augmentation index.

6. An apparatus according to claim 1, further comprising a cuff-pressure changing device which changes, for a blood-pressure measurement, the pressure of the cuff from a pressure higher than a systolic blood pressure of the subject to a pressure lower than a diastolic blood pressure of the subject, wherein the cuff pulse wave is obtained, after the blood-pressure measurement, from the cuff having a pressure lower than the diastolic blood pressure of the subject obtained from the blood-pressure measurement.

7. Use of the augmentation-index measuring apparatus according to claim 1, for inspecting an arteriosclerosis of the subject.