Electronic sphygmomanometer and blood pressure measuring method

Abstract

An electronic sphygmomanometer includes a central processing unit (CPU) that calculates a blood pressure calculation parameter by executing a predetermined calculation using a constant set in advance with respect to a change in a pressure pulse wave amplitude indicating a volume change of an artery at the time of blood pressure measurement. The CPU separately acquires measurement state related information related to a state of a user and/or a state of the cuff at the time of blood pressure measurement. When the measurement state related information is acquired, the CPU corrects the blood pressure calculation parameter by correcting the constant based on the measurement state related information.

1 . An electronic sphygmomanometer comprising:
 a cuff to be attached to a blood pressure measurement site;   pressurization and depressurization means for adjusting a pressure to apply on the cuff;   pressure detection means for detecting a pressure in the cuff;   blood pressure calculation means for calculating a blood pressure value from a cuff pressure;   recording means for recording the blood pressure value; and   operation means for performing a blood pressure measurement;   wherein the blood pressure calculation means comprises a configuration that calculates a blood pressure calculation parameter based on a predetermined calculation of multiplying a constant with respect to a maximum value of a pressure pulse wave amplitude indicating a volume change of an artery at a time of blood pressure measurement, and   wherein the electronic sphygmomanometer further comprises:
 information acquiring means for separately acquiring measurement state related information related to a state of a user and/or a state of the cuff at the time of blood pressure measurement; and 
 correction means for correcting the blood pressure calculation parameter by correcting the constant based on the measurement state related information when the measurement state related information is acquired by the information acquiring means, 
 wherein the information acquiring means comprises a configuration that acquires information of a temporarily determined blood pressure value as the measurement state related information related to the state of the user, and 
 wherein the correction means comprises a configuration that corrects the constant based on the temporarily determined blood pressure value. 
   
     
     
         2 . The electronic sphygmomanometer according to  claim 1 ,
 wherein the blood pressure calculation means comprises a configuration that calculates a systolic blood pressure calculation parameter based on a predetermined calculation of multiplying a first constant to a maximum value of the pressure pulse wave amplitude, and adding a third constant related to a component of a background pulse wave generated when the pressure of the cuff is pressurized to a predetermined pressure outside a blood pressure value measurement range,   wherein the blood pressure calculation means comprises a configuration that calculates a diastolic blood pressure calculation parameter based on a predetermined calculation of multiplying a second constant to the maximum value of the pressure pulse wave amplitude and adding a fourth constant related to a component of the background pulse wave, and   wherein the correction means corrects the third and fourth constants based on the measurement state related information.   
     
     
         3 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires information of a temporarily determined blood pressure value as the measurement state related information related to the state of the user, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the temporarily determined blood pressure value.   
     
     
         4 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires information of a maximum value of the cuff pressure as the measurement state related information, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the maximum value of the cuff pressure.   
     
     
         5 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires information of a maximum value of the pressure pulse wave amplitude as the measurement state related information related to the state of the user, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the maximum value of the pressure pulse wave amplitude.   
     
     
         6 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires information of a wrapping strength of the cuff as the measurement state related information, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the information of the wrapping strength of the cuff.   
     
     
         7 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires cuff specification information related to a size and/or a type of the cuff as the measurement state related information, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the cuff specification information.   
     
     
         8 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires information related to a measurement site of the user as the measurement state related information, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the information related to the measurement site of the user.   
     
     
         9 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires disease information of the user as the measurement state related information, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the disease information of the user.   
     
     
         10 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires age information of the user as the measurement state related information, and   wherein the correction means comprises a configuration that corrects the first and second constants or the third and fourth constants based on the age information of the user.   
     
     
         11 . The electronic sphygmomanometer according to  claim 2 ,
 wherein the information acquiring means comprises a configuration that acquires the measurement state related information based on a detection of a change in an inner pressure of the cuff.   
     
     
         12 . The electronic sphygmomanometer according to  claim 2 , further comprising:
 input means for permitting input of the measurement state related information by the user;   wherein the information acquiring means comprises a configuration that acquires the measurement state related information inputted before the start of the blood pressure measurement.   
     
     
         13 . A blood pressure measurement method for adjusting a pressure to apply on a cuff when the cuff is attached to a blood pressure measurement site with pressurization and depressurization means, and calculating a blood pressure value with blood pressure calculation means based on the cuff pressure detected by pressure detection means, the method comprising the steps of:
 calculating a blood pressure calculation parameter by executing a predetermined calculation using a constant set in advance with respect to a maximum value of a pressure pulse wave amplitude indicating a volume change of an artery at a time of blood pressure measurement in the blood pressure calculation means;   separately acquiring measurement state related information related to a state of a user and/or a state of the cuff at the time of blood pressure measurement with information acquiring means; and   correcting the blood pressure calculation parameter by correcting the constant with correction means based on the measurement state related information when the measurement state related information is acquired by the information acquiring means,   wherein the step of calculating the blood pressure calculation parameter by the blood pressure calculation means comprises calculating the blood pressure calculation parameter based on a predetermined calculation of multiplying the constant to the maximum value of the pressure pulse wave amplitude, and   wherein the step of correcting by the correction means comprises:
 acquiring information of a temporarily determined blood pressure value as the measurement state related information related to the state of the user by the information acquiring means; and 
 correcting the constant based on the temporarily determined blood pressure value. 
   
     
     
         14 . The blood pressure measurement method according to  claim 13 ,
 wherein the step of calculating the blood pressure calculation parameter by the blood pressure calculation means further comprises:
 calculating a systolic blood pressure calculation parameter based on a predetermined calculation of multiplying a first constant to a maximum value of the pressure pulse wave amplitude and adding a third constant related to a component of a background pulse wave; and 
 calculating a diastolic blood pressure calculation parameter based on a predetermined calculation of multiplying a second constant to the maximum value of the pressure pulse wave amplitude and adding a fourth constant related to a component of the background pulse wave, and 
   wherein the step of correcting by the correction means comprises correcting the third and fourth constants based on the measurement state related information.