BLOOD PRESSURE INFORMATION MEASUREMENT DEVICE FOR MEASURING PULSE WAVE PROPAGATION SPEED AS BLOOD PRESSURE INFORMATION

• US 20110224558A1
• Filed: 05/20/2011
• Published: 09/15/2011
• Est. Priority Date: 11/20/2008
• Status: Abandoned Application

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Sato, Hironori, Ogura, Toshihiko, Fujii, Kenji, Kobayashi, Tatsuya, Yoshida, Hideaki
• Application Number:
  US13/112,398
• Publication Number:
  US 20110224558A1
• Time in Patent Office: Days
• US Class Current: 600/490
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers

Abstract

In the measurement device, the blood pressure of the upper arm and the blood pressure of the lower limb are measured using cuffs attached to the upper arm and the lower limb (ankle), respectively. The pulse wave of the upper arm and the pulse wave of the lower limb are measured in synchronization using such cuffs. The upper arm-lower limb pulse wave propagation velocity (baPWV) is calculated based on the appearance time difference of the two pulse waves. The upper arm pulse wave propagation velocity (upper arm PWV) is calculated based on the appearance time difference of the ejection wave and the reflection wave in the upper arm pulse wave. If the values of such propagation velocities are different, a warning is issued.

Claims

1. A blood pressure information measurement device comprising:

a first cuff comprising a first air bladder that attaches to an upper arm;

a second cuff comprising a second air bladder that attaches to a lower limb;

a measurement unit that measures a change in inner pressure of the first air bladder and a change in inner pressure of the second air bladder in synchronization;

a detection unit that detects first blood pressure information from the change in inner pressure of the first air bladder, and detects second blood pressure information from the change in inner pressure of the second air bladder; and

a calculation unit that performs a calculation process based on the first blood pressure information and the second blood pressure information,

wherein the calculation unit executes a first calculation process of calculating a first pulse wave propagation velocity from a pulse wave or the first blood pressure information detected from the change in inner pressure of the first air bladder with the first air bladder attached to the upper arm and with blood on a peripheral side of the first cuff stopped and a pulse wave or the second blood pressure information, and

wherein the calculation unit executes a determination process of determining an appropriateness of the first pulse wave propagation velocity calculated by the first calculation process using at least one blood pressure information of the first blood pressure information or the second blood pressure information.

2. The blood pressure information measurement device according to claim 1,

wherein the calculation unit further executes a second calculation process of calculating a second pulse wave propagation velocity from the pulse wave or the first blood pressure information,

wherein the calculation unit calculates an appearance time difference of the pulse wave or the first blood pressure information and the pulse wave or the second blood pressure information to calculate the first pulse wave propagation velocity in the first calculation process, and

wherein the calculation unit calculates an appearance time difference of an ejection wave and a reflection wave in the pulse wave or the first blood pressure information to calculate the second pulse wave propagation velocity in the second calculation process.

3. The blood pressure information measurement device according to claim 2,

wherein the calculation unit compares the first pulse wave propagation velocity calculated in the first calculation process and the second pulse wave propagation velocity calculated in the second calculation process, and determines whether a difference is greater than a predetermined range for the determination of the appropriateness of the first pulse wave propagation velocity calculated in the first calculation process in the determination process, and

wherein the calculation unit performs a first display control for causing a display device to display a warning when the difference is greater than the predetermined range.

4. The blood pressure information measurement device according to claim 2,

wherein the calculation unit further executes a third calculation process of calculating a blood pressure ratio of the blood pressure value or the second blood pressure information with respect to the blood pressure value or the first blood pressure information,

wherein the calculation unit compares the blood pressure ratio with a threshold value stored in advance to determine whether or not the blood pressure ratio is lower than the threshold value for the determination of the appropriateness of the first pulse wave propagation velocity calculated in the first calculation process in the determination process, and

wherein the calculation unit performs a second display control for causing a display device to display the second pulse wave propagation velocity calculated in the second calculation process as a measurement result when the blood pressure ratio is lower than the threshold value.

5. The blood pressure information measurement device according to claim 4,

wherein the calculation unit executes the second calculation process that calculates the second pulse wave propagation velocity when the blood pressure ratio is lower than the threshold value, and executes the first calculation process that calculates the first pulse wave propagation velocity when the blood pressure value is not lower than the threshold value.

6. The blood pressure information measurement device according to claim 2,

wherein the calculation unit determines whether or not the blood pressure value serving as the second blood pressure information is obtained for the determination of the appropriateness of the first pulse wave propagation velocity calculated in the first calculation process in the determination process, and

wherein the calculation unit performs a third display control for causing a display device to display the second pulse wave propagation velocity calculated in the second calculation process as a measurement result when the second blood pressure value is not obtained.

7. The blood pressure information measurement device according to claim 6, further comprising:

a control unit that causes the measurement unit to measure the change in inner pressure of the first air bladder and the calculation unit to perform the second calculation process and to perform the calculation of the second pulse wave propagation velocity from the pulse wave or the first blood pressure information obtained in the measurement if the second blood pressure value is not obtained, and that causes the measurement unit to measure the change in inner pressure of the first air bladder and the change in inner pressure of the second air bladder in synchronization and the calculation unit to perform the first calculation process and perform calculation of the first pulse wave propagation velocity from the pulse wave or the first blood pressure information and the pulse wave or the second blood pressure information obtained in the measurement if the second blood pressure value is obtained.