BIOLOGICAL INFORMATION PROCESSING DEVICE

• US 20130006123A1
• Filed: 06/29/2012
• Published: 01/03/2013
• Est. Priority Date: 07/01/2011
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: AOSHIMA, Ichiro
• Granted Patent: US 9,307,943 B2
• Time in Patent Office: Days
• US Class Current: 600/483
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/681 Wristwatch-type devices

Abstract

A method for determining an appropriateness of a calculated pulse rate is provided. In a pulse rate monitor, a pulse rate calculation part calculates the pulse rate of the test subject based on the result detected by a pulse wave sensor. Then, a pulse rate difference calculation part calculates a difference (pulse rate difference) between a reference pulse rate and a calculated pulse rate, and a deviation degree is determined based on the pulse rate difference. Also, a SN ratio calculation part calculates a SN ratio of a pulse wave signal detected by the pulse wave sensor, and a reliability of the calculation result in the pulse rate calculation part is determined based on the SN ratio. Then, a pulse rate appropriateness judgment part determines an appropriateness of the calculated pulse rate based on the pulse rate difference (deviation degree) and the SN ratio (reliability).

Claims

1. A biological information processing device comprising:

a pulse rate calculation part that calculates a pulse rate of a test subject;

a deviation degree judgment part that judges a deviation degree between a predetermined reference pulse rate and a calculated pulse rate, which was calculated by the pulse rate calculation part;

a reliability judgment part that judges a reliability of a calculated result of said pulse rate calculation part; and

an appropriateness judgment part that judges an appropriateness of the calculated pulse rate based on the deviation degree and the reliability.

2. The biological information processing device according to claim 1, wherein the appropriateness judgment part includes a reliability condition judgment part for judging whether a predetermined reliability condition is satisfied, the predetermined reliability condition defines the calculated pulse rate as an appropriate when the deviation degree is smaller, the appropriateness of the calculated pulse rate is judged based on a determination result of the reliability condition judgment part.

3. The biological information processing device according to claim 2, wherein the appropriateness judgment part judges an appropriateness of the calculated pulse rate based on a number of times affirmative judgment when a predetermined high deviation condition of the deviation degree is satisfied.

4. The biological information processing device according to claim 2, further comprising:

a body motion detection part that detects a body motion of the test subject; and

a body motion frequency judgment part that judges a frequency of a cyclic body motion of the test subject by using a detection result of the body motion detection part;

wherein the appropriateness judgment part includes a frequency condition judgment part for judging whether a predetermined frequency condition is satisfied, the predetermined frequency condition indicates that the frequency of the cyclic body motion of the test subject is away from the frequency of the calculated pulse rate, the appropriateness of the calculated pulse rate is judged by using a determination result of the reliability condition judgment part and a determination result of the frequency condition judgment part when the deviation degree satisfies a predetermined high deviation degree.

5. The biological information processing device according to claim 2, further comprising:

a body motion detection part that detects a body motion of the test subject; and

a body movement state judgment part that judges a body movement state of the test subject by using a detection result of the body motion detection part;

wherein the appropriateness judgment part includes a consistency condition judgment part for judging whether the body movement state and the calculated pulse rate satisfy a predetermined consistency condition, and when the deviation degree satisfies a predetermined high deviation condition, the appropriateness of the calculated pulse rate is judged by using a determination result of the reliability condition judgment part and a determination result of the consistency condition judgment part.

6. The biological information processing device according to claim 5, wherein the appropriateness judgment part judges the appropriateness of the calculated pulse rate based on a number of times affirmative judgment being determined by the reliability condition judgment part when a determination result of the reliability condition judgment part is an affirmative judgment and also, a determination result of the consistency condition judgment part is a negative judgment.

7. A biological information processing device comprising:

a pulse rate calculation part that calculates a pulse rate of a test subject;

a pulse rate appropriateness judgment part that judges an appropriateness of a calculated pulse rate based on a determination whether the calculated pulse rate calculated by the pulse rate calculation part is within a predetermined variation acceptable range; and

a variation acceptable width setting part that sets a variation acceptable width as a width of the variation acceptable range based on a value of at least one of a continuance, a frequency, and a number of times that improperness is consecutively judged by the pulse rate appropriateness judgment part.

8. The biological information processing device according to claim 7, wherein the variation acceptable width setting part sets the variation acceptable width by a definition, that is the variation acceptable width increases as the value becomes larger.

9. The biological information processing device according to claim 8, wherein the variation acceptable width setting part linearly increases the variation acceptable width for the value.

10. The biological information processing device according to claim 9, wherein as the value becomes larger, the variation acceptable width setting part reduces an increase degree of the variation acceptable width.

11. The biological information processing device according to claim 7, further comprising:

a reliability judgment part for judging a reliability of the calculation result of the pulse rate calculation part;

wherein the pulse rate appropriateness judgment part determines an appropriateness of the calculated pulse rate by using the variation acceptable range and the reliability.

12. The biological information processing device according to claim 11, wherein the reliability judgment part judges the reliability based on a signal to noise ratio of a signal that detected a pulse wave of the test subject, the pulse rate appropriateness judgment part judges the calculated pulse rate as an appropriate when the signal to noise ratio satisfies a predetermined threshold value condition and also, the calculated pulse rate is within the variation acceptable range.

13. The biological information processing device according to claim 7, wherein the variation acceptable range is a range defined as a predetermined reference pulse rate, and

further comprising:

a reference pulse rate update part that updates the reference pulse rate by the calculated pulse rate when the calculated pulse rate is determined as an appropriate.

14. A biological information processing device comprising:

a pulse rate calculation part that calculates a pulse rate of a test subject;

a pulse rate appropriateness judgment part for judging an appropriateness of a calculated pulse rate based on a determination whether the calculated pulse rate calculated by the pulse rate calculation part is within a predetermined variation acceptable range; and

a variation acceptable width setting part that sets a variation acceptable width as a width of the variation acceptable range based on a predetermined reference pulse rate.

15. The biological information processing device according to claim 14, wherein as the reference pulse rate becomes lower, the variation acceptable width setting part increases a variation acceptable width in an upper direction relative to the reference pulse rate as a reference.

16. The biological information processing device according to claim 14, wherein as the reference pulse rate becomes higher, the variation acceptable width setting part increases a variation acceptable width in a lower direction relative to the reference pulse rate as a reference.

17. The biological information processing device according to claim 14, wherein as the reference pulse rate becomes lower, the variation acceptable width setting part increases a variation acceptable width in an upper direction relative to the reference pulse rate as a reference, and also, as the reference pulse rate becomes higher, the variation acceptable width setting part increases a variation acceptable width in a lower direction relative to the reference pulse rate as a reference, an increase degree of the variation acceptable width in an upper direction increases in comparison with an increase degree of the variation acceptable width in a lower direction.

18. The biological information processing device according to claim 15, further comprising:

an exercise state judgment part that judges an exercise state of the test subject;

wherein the variation acceptable width setting part increases an increase degree of the variation acceptable width in an upper direction at a start of exercise as a determination result of the exercise state in comparison with an increase degree of the variation acceptable width in an upper direction at a steady time.

19. The biological information processing device according to claim 16, further comprising:

an exercise state judgment part that judges an exercise state of the test subject;

wherein the variation acceptable width setting part increases an increase degree of the variation acceptable width in a lower direction at a stop of exercise as a determination result of the exercise state in comparison with an increase degree of the variation acceptable width in a lower direction at a steady time.

20. The biological information processing device according to claim 14, wherein the variation acceptable width setting part defines the variation acceptable width as a predetermined minimum variation acceptable width when the reference pulse rate is more than a predetermined pulse rate upper limit setting value, or the reference pulse rate is less than a predetermined pulse rate lower limit setting value.