Pulse wave monitoring device

• US 20040167414A1
• Filed: 12/04/2003
• Published: 08/26/2004
• Est. Priority Date: 12/05/2002
• Status: Active Grant

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Kitawaki, Tomoki, Sato, Hironori, Itonaga, Kazunobu, Hashimoto, Masao, Miyawaki, Yoshinori, Tanabe, Kazuhisa
• Granted Patent: US 7,326,180 B2
• Time in Patent Office: Days
• US Class Current: 600/500
• CPC Class Codes: A61B 5/02 Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/02108 from analysis of pulse wave characteristics
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence

Abstract

A sensor is pressurized adjustably against a patient'"'"'s wrist and detects a pressurized pulse wave of a radial artery in a noninvasive manner so as to measure blood pressure on an arm band wound around the patient'"'"'s predetermined portion. A CPU calculates indices reflecting a reflecting phenomenon of a pulse wave as organism information different from the blood pressure based on the detected pulse waveform, and relates the measured blood pressure value with calculated indices so as to display them on an indicator. A doctor checks displayed contents so as to clearly understand a state of a circulatory system represented by a correlation between the patient'"'"'s blood pressure and the indices so as to be capable of obtaining information which supports a diagnosis and prescription quickly.

Claims

1. A pulse wave monitoring device comprising:

a pulse wave detection device configured to detect a pulse wave of a subject;

a computation unit that identifies a plurality of characteristic points of the pulse wave detected by the pulse wave detection device, calculates a plurality of characteristic parameters corresponding to the identified characteristic points and calculates an index indicative of a pulse wave reflection by performing a computation on the characteristic parameters;

a blood pressure measuring device configured to measure a blood pressure of the subject; and

a display unit that shows the calculated index and the measured blood pressure.

2. The pulse wave monitoring device of claim 1, wherein a first characteristic point of the characteristic points corresponds to a peak of a traveling wave component of the detected pulse wave and a second characteristic point of the characteristic points correspond to a peak of a reflection wave component of the detected pulse wave, the reflection wave component being generated as a result of a reflection of the traveling wave component, and the index is a ratio of amplitudes of the pulse wave at the first and second characteristic points.

3. The pulse wave monitoring device of claim 1, wherein a first characteristic point of the characteristic points corresponds to a traveling wave component of the detected pulse wave and a second characteristic point of the characteristic points correspond to a reflection wave component of the detected pulse wave, the reflection wave component being generated as a result of a reflection of the traveling wave component, and the index is a time difference between the first and second characteristic points.

4. The pulse wave monitoring device of claim 1, 2 or 3, wherein the computation unit adjusts the calculated index based on an adjustment factor of the subject.

5. The pulse wave monitoring device of claim 2, wherein the index comprises an augmentation index.

6. The pulse wave monitoring device of claim 5, wherein the computation unit adjusts the calculated augmentation index based on a pulse of the subject.

7. The pulse wave monitoring device of claim 3, wherein the index comprises Δ

Tp.

8. The pulse wave monitoring device of claim 7, wherein the computation unit adjusts the calculated Δ

Tp based on a height of the subject.

9. The pulse wave monitoring device of any of claims 1-3 or 5-8, further comprising a memory device that stores a plurality of the calculated indices and a plurality of the measured blood pressures in a chronological order.

10. The pulse wave monitoring device of claim 9, wherein the display unit shows the calculated indices and the measured blood pressures in the chronological order.

11. The pulse wave monitoring device of any of claim 1-3 or 5-8, wherein the display units shows a prescription determined based on a correlation between the calculated index and the measured blood pressure.

12. A pulse wave monitoring device comprising:

a pulse wave detection device configured to detect a pulse wave of a subject;

a computation unit that calculates a plurality of different indices based on a wave form of the detected pulse wave, each of the different indices being indicative of a pulse wave reflection; and

a display unit that shows a correlation between at least two of the different indices.

13. The pulse wave monitoring device of claim 12, wherein the display units shows a prescription determined based on the correlation.

14. The pulse wave monitoring device of claim 12, further comprising a blood pressure measuring device configured to measure a blood pressure of the subject, wherein the display unit is configured to show a correlation between the measured blood pressure and at least one of the different indices.

15. The pulse wave monitoring device of claim 12 or 13, further comprising a memory device that stores a plurality of the calculated indices for each of the different indices in a chronological order.

16. The pulse wave monitoring device of claim 14, further comprising a memory device that stores a plurality of the calculated indices for each of the different indices and a plurality of the measured blood pressures in a chronological order.

17. The pulse wave monitoring device of claim 15, wherein the display unit shows the calculated indices stored in the memory device for at least two of the different indices in the chronological order.

18. The pulse wave monitoring device of claim 16, wherein the display unit shows the calculated indices stored in the memory device for at least one of the different indices and the measured blood pressures stored in the memory device in the chronological order.

19. The pulse wave monitoring device of claim 12, 13, 14, 16 or 18, wherein the computation unit adjusts at least one of the different indices based on an adjustment factor of the subject.

20. The pulse wave monitoring device of claim 12, 13, 14, 16 or 18, wherein one of the indices comprises an augmentation index.

21. The pulse wave monitoring device of claim 20, wherein the computation unit adjusts the calculated augmentation index based on a pulse of the subject.

22. The pulse wave monitoring device of claim 20, wherein one of the index comprises Δ

Tp.

23. The pulse wave monitoring device of claim 22, wherein the computation unit adjusts the calculated Δ

Tp based on a height of the subject.

24. The pulse wave monitoring device of any of claim 14, 16 or 18, wherein the display units shows a prescription determined based on a correlation between one of the indices and the blood pressure.