Blood pressure measuring system
First Claim
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1. A blood pressure measuring system comprising:
- blood pressure measuring means for measuring a blood pressure by using a pulse wave signal representative of a pulsation of an artery of a living body, said blood pressure measuring means comprising;
pulse wave detecting means for continuously detecting a pulse wave of said pulse wave signal;
storage means for storing data representative of a continuous pulse wave that is outputted from said pulse wave detecting means, said data including discrete data of a pulse amplitude of said pulse wave;
data processing means for reading discrete data of said pulse amplitude of said pulse wave from said storage means, and for processing said discrete data by using a spline function to generate data representative of a smooth continuous line; and
blood pressure calculating means for calculating a blood pressure value on the basis of said data of said smooth continuous line, said blood pressure calculating means including detecting means for detecting a cuff pressure being treated as a diastolic blood pressure at an inflection point of said data representative of said smooth continuous line.
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Abstract
A pressure sensor gathers discrete data representing the pulse amplitude of a pulse wave signal when a cuff pressure is increased and decreased. A RAM stores the discrete data of the pulse amplitude. A CPU processes the discrete data by using a spline function, to thereby generate the data representative of a smooth continuous line passing by points of the pulse amplitude of the discrete data. This process reduces a variation of the pulse amplitude of a pulse wave signal, to thereby minimize a variation of the blood pressure values. An inflection point of the smooth continuous line is used as a diastolic blood pressure value.
30 Citations
17 Claims
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1. A blood pressure measuring system comprising:
blood pressure measuring means for measuring a blood pressure by using a pulse wave signal representative of a pulsation of an artery of a living body, said blood pressure measuring means comprising; pulse wave detecting means for continuously detecting a pulse wave of said pulse wave signal; storage means for storing data representative of a continuous pulse wave that is outputted from said pulse wave detecting means, said data including discrete data of a pulse amplitude of said pulse wave; data processing means for reading discrete data of said pulse amplitude of said pulse wave from said storage means, and for processing said discrete data by using a spline function to generate data representative of a smooth continuous line; and blood pressure calculating means for calculating a blood pressure value on the basis of said data of said smooth continuous line, said blood pressure calculating means including detecting means for detecting a cuff pressure being treated as a diastolic blood pressure at an inflection point of said data representative of said smooth continuous line. - View Dependent Claims (2, 3)
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4. A blood pressure measuring method for measuring a blood pressure by using a pulse wave signal representative of a pulsation of an artery of a living body, comprising the steps of
continuously detecting a pulse wave of said pulse wave signal; -
storing data representative of a continuous pulse wave, said data including discrete data of a pulse amplitude of said pulse wave; reading said discrete data of said pulse amplitude of said pulse wave; processing said discrete data by using a spline function to generate data representative of a smooth continuous line; calculating a blood pressure value on the basis of said data of said smooth continuous line; and detecting a cuff pressure being treated as a diastolic blood pressure at an inflection point of said data representative of said smooth continuous line. - View Dependent Claims (5, 6)
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7. A blood pressure measuring system comprising a blood pressure measuring circuit for measuring a blood pressure by using a pulse wave signal representative of a pulsation of an artery of a living body, said blood pressure measuring means comprising:
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pulse wave detecting means for continuously detecting a pulse wave of said pulse wave signal; storage means for storing data representative of a continuous pulse wave that is outputted from said pulse wave detecting means, said data including discrete data of a pulse amplitude of said pulse wave; correcting means for reading discrete data of said pulse amplitude of said pulse wave from said storage means, and for correcting said discrete data by using a predetermined function to generate corrected data of said pulse amplitude, weighting coefficient determining means for determining weighting coefficient on the basis of a ratio defined by said data read from said storage means and said corrected data, data processing means for weighting said data read from said storage means by said weighting coefficient, and for processing the weighted data using a spline function to generate data representative of a smooth continuous line; and blood pressure calculating means for calculating a blood pressure value on the basis of said smooth continuous line. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of measuring a blood pressure by using a pulse wave signal representative of a pulsation of an artery of a living body, said method comprising the steps of:
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continuously detecting a pulse wave of said pulse wave signal; storing data representative of said pulse wave being continuously detected, said data including discrete data of a pulse amplitude of said pulse wave; reading said discrete data of said pulse amplitude of said pulse wave from said stored data; correcting said discrete data by using a predetermined function to generate corrected data of said pulse amplitude; determining a weighting coefficient on the basis of a ratio defined by said data read from said stored data and said corrected data; weighting said data read from said stored data using said weighting coefficient to generate weighted data; processing the weighted data using a spline function to generate data representative of a smooth continuous line; and calculating a blood pressure value on the basis of said smooth continuous line. - View Dependent Claims (14, 15, 16, 17)
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Specification