Cuff volumetric pulse wave obtaining apparatus, cuff volumetric pulse wave analyzing apparatus, pressure pulse wave obtaining apparatus, and pressure pulse wave analyzing apparatus

• US 7,361,148 B2
• Filed: 01/14/2004
• Issued: 04/22/2008
• Est. Priority Date: 01/24/2003
• Status: Active Grant

• Current Assignee: Fukuda Denshi Company Limited
• Original Assignee: Colin Medical Technology Corporation (Omron Corporation)
• Inventors: Narimatsu, Kiyoyuki
• Primary Examiner(s): Marmor, II; Charles A.
• Assistant Examiner(s): Natnithithadha; Navin
• Application Number:
  US10/756,408
• Publication Number:
  US 20040158162A1
• Time in Patent Office: 1,560 Days
• Field of Search: 600/481, 600/485, 600490-504
• US Class Current: 600/494
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/0275 using tracers, e.g. dye dilution
• CPC Class Codes: A61B 5/4035 Evaluating the autonomic nervous system
• CPC Class Codes: A61B 5/4041 Evaluating nerves condition
• CPC Class Codes: A61B 7/04 Electric stethoscopes microphones, acoustic transducers therefor H04R

Abstract

A subject evaluation value measuring apparatus 10, functioning as a cuff volumetric pulse wave obtaining apparatus, includes a pulse wave determining device (i.e., a cuff volumetric pulse wave determining device) 52 that determines, using an inverse transfer function 1H(f), stored in a ROM (i.e., an inverse transfer function memory) 42, that corresponds to a pre-determined transfer function H(f) between input, i.e., pressure pulsation produced in a cuff 20, and output, i.e., pressure pulsation detected by a pressure sensor 24, a no-delay cuff volumetric pulse wave P_K(t) having substantially no delay of transmission, based on an actual cuff pulse wave signal SM outputted by the pressure sensor 24. The thus determined cuff volumetric pulse wave P_K(t) is free of waveform distortion and accordingly enjoys high accuracy.

Claims

1. An apparatus for obtaining a cuff volumetric pulse wave, comprising:

a cuff adapted to be worn on a limb of a living subject so that a pressure pulsation is produced in the cuff;

a pressure sensor which is connected to the cuff, and which detects, as an actual cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff;

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between pressure pulsation as input and pressure oscillation as output; and

a cuff volumetric pulse wave determining means for determining a no-delay cuff volumetric pulse wave having substantially no delay of transmission based on the actual cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory.

2. An apparatus for analyzing a cuff volumetric pulse wave obtained from a living subject, comprising:

the cuff volumetric pulse wave obtaining apparatus according to claim 1; and

a pulse wave analyzing means for analyzing the no-delay cuff volumetric pulse wave obtained by the cuff volumetric pulse wave obtaining apparatus, and thereby determining at least one of a blood pressure, a pulse wave propagation velocity, an arteriosclerosis evaluation index, and an autonomic nerve evaluation value of the subject.

3. The apparatus according to claim 2, wherein the pulse wave analyzing means determines at least one of a maximum magnitude, a minimum magnitude, a rising point, a degree of sharpness % MAP, a maximum slope SLOPE of a rising portion, an area, an augmentation index AI, and a ratio of a maximum magnitude after change of posture of the subject to a maximum magnitude before the change of posture, of a heartbeat-synchronous pulse of the no-delay cuff volumetric pulse wave determined by the cuff volumetric pulse wave determining means.

4. A method of obtaining a cuff volumetric pulse wave with an apparatus including a cuff adapted to be worn on a limb of a living subject so that a pressure pulsation is produced in the cuff,

a pressure sensor which is connected to the cuff, and which detects, as an actual cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between pressure pulsation as input and pressure oscillation as output, and

a cuff volumetric pulse wave determining means for determining a no-delay cuff volumetric pulse wave having substantially no delay of transmission based on the actual cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory; and

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the no-delay cuff volumetric pulse wave having substantially no delay of transmission, based on the actual cuff volumetric pulse wave detected by the pressure sensor.

5. A method of obtaining a cuff volumetric pulse wave with an apparatus including a cuff adapted to be worn on a limb of a living subject so that a pressure pulsation is produced in the cuff,

a pressure sensor which is connected to the cuff, and which detects, as an actual cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between pressure pulsation as input and pressure oscillation as output,

a cuff volumetric pulse wave determining means for determining a no-delay cuff volumetric pulse wave having substantially no delay of transmission based on the actual cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, and

a pulse wave analyzing means for analyzing the no-delay cuff volumetric pulse wave determined by the cuff volumetric pulse wave determining means, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory;

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the no-delay cuff volumetric pulse wave having substantially no delay of transmission, based on the actual cuff volumetric pulse wave detected by the pressure sensor; and

(c) a step of analyzing the determined no-delay cuff volumetric pulse wave, and thereby determining at least one of a blood pressure, a pulse wave propagation velocity, an arteriosclerosis evaluation index, and an autonomic nerve evaluation value of the subject.

6. The method according to claim 5, further comprising:

determining with the pulse wave analyzing means at least one of a maximum magnitude, a minimum magnitude, a rising point, a degree of sharpness % MAP, a maximum slope SLOPE of a rising portion, an area, an augmentation index AI, and a ratio of a maximum magnitude after change of posture of the subject to a maximum magnitude before the change of posture, of a heartbeat-synchronous pulse of the no-delay cuff volumetric pulse wave determined by the cuff volumetric pulse wave determining means.

7. An apparatus for obtaining a pressure pulse wave, comprising:

a cuff adapted to be worn on a limb of a living subject so as to press an artery of the limb;

a pressure sensor which is connected to the cuff, and which detects, as a cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff;

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between intra-arterial pressure as input and pressure oscillation as output; and

a pressure pulse wave determining means for determining a pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory.

8. An apparatus for analyzing a pressure pulse wave obtained from a living subject, comprising:

the pressure pulse wave obtaining apparatus according to claim 7; and

a pulse wave analyzing means for analyzing the pressure pulse wave produced in the artery, and obtained by the pressure pulse wave obtaining apparatus, and thereby determining at least one of a blood pressure, a pulse wave propagation velocity, an arteriosclerosis evaluation index, and an autonomic nerve evaluation value of the subject.

9. The apparatus according to claim 8, wherein the pulse wave analyzing means determines at least one of a maximum magnitude, a minimum magnitude, a rising point, a degree of sharpness % MAP, a maximum slope SLOPE of a rising portion, an area, an augmentation index AI, and a ratio of a maximum magnitude after change of posture of the subject to a maximum magnitude before the change of posture, of a heartbeat-synchronous pulse of the pressure pulse wave determined by the pressure pulse wave determining means.

10. A method of obtaining a pressure pulse wave with an apparatus including a cuff adapted to be worn on a limb of a living subject so as to press an artery of the limb,

a pressure sensor which is connected to the cuff, and which detects, as a cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between intra-artery pressure as input and pressure oscillation as output, and

a pressure pulse wave determining means for determining a pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory; and

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor.

11. A method of obtaining a pressure pulse wave with an apparatus including a cuff adapted to be worn on a limb of a living subject so as to press an artery of the limb,

a pressure sensor which is connected to the cuff, and which detects, as a cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between intra-arterial pressure as input and pressure oscillation as output,

a pressure pulse wave determining means for determining a pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, and

a pulse wave analyzing means for analyzing the pressure pulse wave determined by the pressure pulse wave determining means, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory;

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor; and

(c) a step of analyzing the determined pressure pulse wave, and thereby determining at least one of a blood pressure, a pulse wave propagation velocity, an arteriosclerosis evaluation index, and an autonomic nerve evaluation value of the subject.

12. The method according to claim 11, further comprising:

determining with the pulse wave analyzing means at least one of a maximum magnitude, a minimum magnitude, a rising point, a degree of sharpness % MAP, a maximum slope SLOPE of a rising portion, an area, an augmentation index AI, and a ratio of a maximum magnitude after change of posture of the subject to a maximum magnitude before the change of posture, of a heartbeat-synchronous pulse of the pressure pulse wave determined by the pressure pulse wave determining means.

13. A method of obtaining a cuff volumetric pulse wave with an apparatus including a cuff adapted to be worn on a limb of a living subject so that a pressure pulsation is produced in the cuff,

a pressure sensor which is connected to the cuff, and which detects, as an actual cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between pressure pulsation as input and pressure oscillation as output, and

a cuff volumetric pulse wave determining device which determines a no-delay cuff volumetric pulse wave having substantially no delay of transmission based on the actual cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory; and

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the no-delay cuff volumetric pulse wave having substantially no delay of transmission, based on the actual cuff volumetric pulse wave detected by the pressure sensor.

14. A method of obtaining a cuff volumetric pulse wave, with an apparatus including a cuff adapted to be worn on a limb of a living subject so that a pressure pulsation is produced in the cuff,

a pressure sensor which is connected to the cuff, and which detects, as an actual cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between pressure pulsation as input and pressure oscillation as output,

a cuff volumetric pulse wave determining device which determines a no-delay cuff volumetric pulse wave having substantially no delay of transmission based on the actual cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, and

a pulse wave analyzing device which analyzes the no-delay cuff volumetric pulse wave determined by the cuff volumetric pulse wave determining device, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory;

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the no-delay cuff volumetric pulse wave having substantially no delay of transmission, based on the actual cuff volumetric pulse wave detected by the pressure sensor; and

(c) a step of analyzing the determined no-delay cuff volumetric pulse wave, and thereby determining at least one of a blood pressure, a pulse wave propagation velocity, an arteriosclerosis evaluation index, and an autonomic nerve evaluation value of the subject.

15. A method of obtaining a pressure pulse wave with an apparatus including a cuff adapted to be worn on a limb of a living subject so as to press an artery of the limb,

a pressure sensor which is connected to the cuff, and which detects, as a cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between intra-artery pressure as input and pressure oscillation as output, and

a pressure pulse wave determining device which determines a pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory; and

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor.

16. A method of obtaining a pressure pulse wave with an apparatus comprising a cuff adapted to be worn on a limb of a living subject so as to press an artery of the limb,

a pressure sensor which is connected to the cuff, and which detects, as a cuff volumetric pulse wave, a pressure oscillation transmitted thereto from the cuff,

an inverse transfer function memory which stores an inverse transfer function corresponding to a transfer function between intra-arterial pressure as input and pressure oscillation as output,

a pressure pulse wave determining device which determines a pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor and the inverse transfer function stored by the inverse transfer function memory, and

a pulse wave analyzing device which analyzes the pressure pulse wave determined by the pressure pulse wave determining device, the method comprising:

(a) a step of determining the inverse transfer function corresponding to the transfer function, and storing the determined inverse transfer function in the inverse transfer function memory;

(b) a step of determining, using the inverse transfer function stored by the inverse transfer function memory, the pressure pulse wave produced in the artery, based on the cuff volumetric pulse wave detected by the pressure sensor; and

(c) a step of analyzing the determined pressure pulse wave, and thereby determining at least one of a blood pressure, a pulse wave propagation velocity, an arteriosclerosis evaluation index, and an autonomic nerve evaluation value of the subject.