Noninvasive sphygmomanometer

• US 7,008,379 B2
• Filed: 10/10/2003
• Issued: 03/07/2006
• Est. Priority Date: 11/08/2002
• Status: Expired due to Fees

• Current Assignee: Nihon Seimitsu Sokki Company Limited
• Original Assignee: Nihon Seimitsu Sokki Company Limited
• Inventors: Suda, Eikichi, Takahashi, Yukio
• Primary Examiner(s): Hindenburg, Max F.
• Assistant Examiner(s): Natnithithadha, Navin
• Application Number:
  US10/682,816
• Publication Number:
  US 20040127801A1
• Time in Patent Office: 879 Days
• Field of Search: 600490-499, 600/481, 600/485, 600/587
• US Class Current: 600/490
• 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 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.

2. The noninvasive sphygmomanometer according to claim 1, 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.

3. 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 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.