Blood pressure measuring system
AssigneeNihon Kohden Corporation
InventorsJun Motogi, Yoshio Sakai, Sunao Takeda
Life of this patent
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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.
Claims17
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.
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.
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:
- 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.
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:
- 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.
Dependencies are inferred from the claim text.