Biological information processing device

• US 9,307,943 B2
• Filed: 06/29/2012
• Issued: 04/12/2016
• 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
• Primary Examiner(s): Natnithithadha, Navin
• Assistant Examiner(s): MESSERSMITH, ERIC J
• Application Number:
  US13/537,668
• Publication Number:
  US 20130006123A1
• Time in Patent Office: 1,383 Days
• Field of Search: 600500-509
• US Class Current: 1/1
• 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 processor configured to

calculate a pulse rate of a test subject,

judge a deviation degree between a predetermined reference pulse rate and a calculated pulse rate,

judge, based on a reliability judgment reference, a reliability of a calculated result on the calculated pulse rate, and

judge an appropriateness of the calculated pulse rate based on the deviation degree and the reliability,

the reliability judgment reference being set in accordance with the deviation degree that has been judged,

the deviation degree including a first pulse range and a second pulse range each of which indicates a scale of a deviation between the predetermined reference pulse rate and the calculated pulse rate, the second pulse range being greater than the first pulse range,

the reliability judgment reference including at least two predetermined reliability conditions that are different from each other,

wherein the processor is further configured such that when the scale of a deviation is within the first pulse range, the processor determines that the calculated pulse rate is appropriate when a fewer number of the predetermined reliability conditions are satisfied than when the scale of a deviation is within the second pulse range.

2. The biological information processing device according to claim 1, wherein the reliability judgment reference further includes at least two reliability judgment values that are different from each other, and a reliability judgment value that the processor uses to determine the appropriateness of the calculated pulse rate when the scale of a deviation is within the first pulse range is smaller than a reliability judgment value that the processor uses to determine the appropriateness of the calculated pulse rate when the scale of a deviation is within the second pulse range.

3. The biological information processing device according to claim 2, wherein the processor is configured to judge the appropriateness of the calculated pulse rate based on the number of times affirmative judgment when the scale of the deviation is within the second pulse range.

4. The biological information processing device according to claim 2, wherein the processor is further configured to

detect a body motion of the test subject,

judge a frequency of a cyclic body motion of the test subject by using a detection result on the body motion that has been detected, and

judge 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 the determination result on whether the predetermined reliability condition is satisfied and a determination result on whether the predetermined frequency condition is satisfied when the scale of the deviation is within the second pulse range.

5. The biological information processing device according to claim 2, wherein the processor is configured to

detect a body motion of the test subject,

judge a body movement state of the test subject by using a detection result on the body motion that has been detected, and

judge 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 the determination result on whether the predetermined reliability condition is satisfied and a determination result on whether the body movement state and the calculated pulse rate satisfy the predetermined consistency condition.

6. The biological information processing device according to claim 5, wherein the processor is further configured to

judge the appropriateness of the calculated pulse rate based on a number of times affirmative judgment being determined when the determination result on whether the predetermined reliability condition is satisfied is an affirmative judgment and further the determination result on whether the body movement state and the calculated pulse rate satisfy the predetermined consistency condition.

7. The biological information processing device according to claim 1, wherein the processor is further configured to

judge the appropriateness of the calculated pulse rate based on a number of times affirmative judgment when the scale of the deviation between the reference pulse rate and the calculated pulse rate is within the second pulse range.

8. The biological information processing device according to claim 1, wherein

the processor further detects a body motion of the test subject, judges a frequency of the body motion of the test subject by using a detection result on the body motion that has been detected, and judges whether the frequency of the body motion of the test subject and a frequency corresponding to the calculated pulse rate satisfy a predetermined frequency condition, and

the appropriateness of the calculated pulse rate is judged by using the determination result on whether the predetermined reliability condition is satisfied and a determination result on whether the predetermined frequency condition is satisfied when the scale of the deviation between the reference pulse rate and the calculated pulse rate is within the second pulse range.

9. The biological information processing device according to claim 1, wherein

the processor detects a body motion of the test subject, judges a body movement state of the test subject by using a detection result on the body motion that has been detected, and judges whether the calculated pulse rate satisfies a predetermined consistency condition that is set based on the body movement state, and

when the deviation degree satisfies a predetermined high deviation condition, the appropriateness of the calculated pulse rate is judged by using the determination result on whether the predetermined reliability condition is satisfied and a determination result on whether the body movement state and the calculated pulse rate satisfy the predetermined consistency condition.

10. The biological information processing device according to claim 9, wherein

the predetermined consistency condition is a threshold relating to a pulse rate that is set in according with the body movement state.