MEASUREMENT DEVICE, MEASUREMENT METHOD, AND RECORDING MEDIUM STORING A MEASUREMENT PROGRAM

• US 20140257117A1
• Filed: 10/22/2012
• Published: 09/11/2014
• Est. Priority Date: 10/28/2011
• Status: Active Grant

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Sato, Hironori, Utsuno, Hideo, Matsuhisa, Hiroshi, Ogura, Toshihiko, Yamada, Keisuke
• Granted Patent: US 10,085,650 B2
• Time in Patent Office: Days
• US Class Current: 600/500
• CPC Class Codes: A61B 5/02014 Determining aneurysm
• 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
• CPC Class Codes: A61B 5/024 Detecting, measuring or recording pulse rate or heart rate A61B5/0205, A61B5/021 take precedence
• CPC Class Codes: A61B 5/6828 Leg
• CPC Class Codes: A61B 5/7246 using correlation, e.g. template matching or determination of similarity
• CPC Class Codes: A61B 5/7257 using Fourier transforms
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence

Abstract

A measurement device includes a detection device to detect a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur, a comparison device to calculate a comparison result by comparing frequency characteristics between the pulse wave signals, and a determination device to determine at least one of the presence/absence and size of an arterial aneurysm based on a predetermined characteristic amount for a frequency contained in the comparison result.

Claims

1. A measurement device comprising:

a detector configured to detect a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur; and

a comparator configured to calculate a comparison result by comparing frequency characteristics between the pulse wave signals,

wherein the comparator includes a transfer function calculator configured to calculate a transfer function between the first measurement location and the second measurement location; and

the measurement device further comprises;

a determinator configured to determine the presence/absence of an arterial aneurysm based on a degree of variation in a phase in the phase difference characteristics of the transfer function.

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. A measurement device comprising:

a detector configured to detect a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur; and

a comparator configured to calculate a comparison result by comparing frequency characteristics between the pulse wave signals,

wherein the comparator includes a transfer function calculator configured to calculate a transfer function between the first measurement location and the second measurement location; and

the measurement device further determinator configured to determine at least one of the presence/absence and size of an arterial aneurysm based on a frequency interval at which an extreme value appears in gain characteristics of the transfer function.

8. A measurement device comprising:

a detector configured to detect a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur; and

a comparator configured to calculate a comparison result by comparing frequency characteristics between the pulse wave signals,

wherein the comparator includes a frequency characteristic calculator configured to calculate frequency characteristics with respect to pulse wave propagation velocities between the pulse wave signals; and

the measurement device further comprises;

a determinator configured to determine at least one of the presence/absence and size of an arterial aneurysm based on a predetermined characteristic amount for a frequency contained in the comparison result.

9. The measurement device according to claim 8,

wherein the determinator determines the presence/absence of an arterial aneurysm based on a degree of variation in the pulse wave propagation velocities found in the frequency characteristics with respect to the pulse wave propagation velocities.

10. The measurement device according to claim 8,

wherein the determinator determines at least one of the presence/absence and size of an arterial aneurysm based on a frequency interval of a fluctuation in the pulse wave propagation velocities found in the frequency characteristics with respect to the pulse wave propagation velocities.

11. A processing method comprising:

detecting a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur; and

calculating a comparison result by comparing frequency characteristics between the pulse wave signals,

wherein calculating includes calculating a transfer function between the first measurement location and the second measurement location; and

the processing method further comprises;

causing a computer to output information regarding the presence/absence of an arterial aneurysm based on a degree of variation in a phase in the phase difference characteristics of the transfer function.

12. A non-transitory computer readable recording medium storing instructions for causing an electronic processor to perform the functions of:

detecting a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur; and

calculating a comparison result by comparing frequency characteristics between the pulse wave signals,

wherein calculating includes calculating a transfer function between the first measurement location and the second measurement location; and

the program further includes;

determining the presence/absence of an arterial aneurysm based on a degree of variation in a phase in the phase difference characteristics of the transfer function.

13. A measurement device comprising:

a detector configured to detect a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur; and

a comparator configured to calculate a comparison result by comparing frequency characteristics between the pulse wave signals,

wherein the comparator includes a transfer function calculator configured to calculate a transfer function between the first measurement location and the second measurement location and a means for calculating a phase delay time for each frequency in the pulse wave signals; and

the measurement device further comprises;

a determinator configured to determine at least one of the presence/absence and size of an arterial aneurysm based on a state in which phase difference characteristics of the transfer function intersect with a phase angle calculated based on an average of the phase delay times calculated for each frequency.

14. The measurement device according to claim 13,

wherein the determinator determines at least one of the presence/absence and size of an arterial aneurysm based on a number of times the phase difference characteristics of the transfer function intersect with a phase angle calculated based on an average of the phase delay times calculated for each frequency.

15. The measurement device according to claim 14,

wherein the determinator determines the size of an arterial aneurysm based on a frequency interval at which the phase difference characteristics of the transfer function intersect with the phase angle calculated based on an average of the phase delay times calculated for each frequency.

16. The measurement device according to claim 13, wherein the determinator determines at least one of the presence/absence and size of an arterial aneurysm based on a frequency interval at which the phase difference characteristics of the transfer function intersect with a phase angle calculated based on an average of the phase delay times calculated for each frequency.