Noninvasive sphygmomanometer

• US 20040127801A1
• Filed: 10/10/2003
• Published: 07/01/2004
• Est. Priority Date: 11/08/2002
• Status: Active Grant

• Current Assignee: Nihon Seimitsu Sokki Company Limited
• Original Assignee: Nihon Seimitsu Sokki Company Limited
• Inventors: Takahashi, Yukio, Suda, Eikichi
• Granted Patent: US 7,008,379 B2
• Time in Patent Office: Days
• US Class Current: 600/485
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
• CPC Class Codes: A61B 5/107 Measuring physical dimensions, e.g. size of the entire body or parts thereof

Abstract

A noninvasive sphygmomanometer capable of obtaining an accurate blood pressure value is provided without complicating a structure and with little time-consuming work. A photointerrupter 31, a wave-shaping circuit 75, a rotation number counting circuit 77, and a discharge amount calculating circuit 78 which measure a discharge amount of a pressure pump 13, and an arm circumference length detecting circuit 79 which calculates an arm circumference length of a subject person based on a relationship between a pressure in a bladder 8 provided in an armband 9 and the measured discharge amount of the pressure pump 13 is provided. Then, a blood pressure value is corrected based on the calculated arm circumference length.

Claims

1. A noninvasive sphygmomanometer, comprising:

a discharge amount measurer which measures a discharge amount of a pressure pump; and

a measuring region circumference length calculator which calculates a measuring region circumference length of a subject person or a subject animal based on a relationship between a pressure in a gas bag provided in a measuring region enclosing portion which encloses a measuring region of the subject person or the subject animal and the discharge amount measured by said discharge amount measurer.

2. The noninvasive sphygmomanometer according to claim 1, wherein

said discharge amount measurer sets a first threshold value and a second threshold value higher than the first threshold value and less than or equal to a target pressure set value under measurement, and measures the discharge amount of the pressure pump until reaching the second threshold value from the first threshold value, using a pressure value in the gas bag after the gas bag expands with a gas discharged from the pressure pump and occupies a space between the measuring region and the measuring region enclosing portion.

3. The noninvasive sphygmomanometer according to claim 2, wherein

a rotation number detector which counts the number of rotation of a motor for the pressure pump is provided on the pressure pump as said discharge amount measurer;

and

the number of rotation of the motor is counted and the discharge amount of the pressure pump is calculated by an output of the rotation number detector.

6. The noninvasive sphygmomanometer according to claim 1, further comprising:

a measurement result corrector which corrects a result of blood pressure measurement based on the measuring region circumference length of the subject person or the subject animal calculated by said measuring region circumference length calculator.

4. A noninvasive sphygmomanometer, comprising:

a rotation number detector which counts the number of rotation of a motor for a pressure pump; and

a measuring region circumference length calculator which calculates a measuring region circumference length of a subject person or a subject animal based on a relationship between a pressure in a gas bag provided in a measuring region enclosing portion which encloses a measuring region of the subject person or the subject animal and the number of rotation of the motor counted by said rotation number detector.

5. The noninvasive sphygmomanometer according to claim 4, wherein

said rotation number detector sets a first threshold value and a second threshold value higher than the first threshold value and less than or equal to a target pressure set value under measurement, and measures the number of rotation of the motor until reaching the second threshold value from the first threshold value, using a pressure value in the gas bag after the gas bag expands with a gas discharged from the pressure pump and occupies a space between the measuring region and the measuring region enclosing portion.