Noninvasive continuous blood measuring apparatus and a method of noninvasively measuring continuous blood pressure
First Claim
1. A noninvasive continuous blood pressure measuring apparatus comprising:
- oscillating means for generating an oscillation signal having a desired frequency and a desired amplitude;
a substrate;
a plurality of exciters arranged on said substrate in a direction responsive to said oscillation signal for inducing exciter waveforms in an artery and a blood in said artery of a living body;
a plurality of sensors respectively arranged on said substrate in said direction a predetermined interval apart from said exciters for receiving induced exciter waveforms transmitted through said artery from said living body and outputting detection signals;
switching means for effecting recurrently switching and time-divisionally outputting outputs of said sensors;
determining and selecting means responsive to said switching means for determining one of said outputs in accordance with an output of said switching means and a predetermined Judging condition and for selecting and outputting said one of said outputs;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
calculating means for receiving said absolute values from said hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said one of said outputs from said determining and selecting means and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means.
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Abstract
One of pairs of an exciter and a sensor is selected in accordance with the detection signal which is derived from an exciter waveform induced in an artery transmitted therethrough. The pairs of exciters and sensors are arranged on a substrate in various formations. A/D converters are provided to respective detection signals. A frequency of the oscillation signal supplied to the exciter is controlled by various oscillation signal generation circuits. Bandpass filtering for extracting the exciter waveform, low-pass-filtering for extracting a natural blood pressure waveform, phase difference detection processes are provided by a microprocessor, wherein the bandpass filtering and low-pass-filtering processes may be replaced with a bandpass filter and a low pass filter, and their outputs are selected by a switching circuit and supplied to the microprocessor through one a/d converter. The frequency of the oscillation signal is controlled to an optimum frequency by detecting the detection signal and estimating the attenuation, dispersion, phase shift with respect to different frequency and by determining one of the different frequency in accordance with the estimation result. The waveform of the oscillation signal is controlled to an optimum waveform similarly.
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Citations
31 Claims
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1. A noninvasive continuous blood pressure measuring apparatus comprising:
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oscillating means for generating an oscillation signal having a desired frequency and a desired amplitude;
a substrate;
a plurality of exciters arranged on said substrate in a direction responsive to said oscillation signal for inducing exciter waveforms in an artery and a blood in said artery of a living body;
a plurality of sensors respectively arranged on said substrate in said direction a predetermined interval apart from said exciters for receiving induced exciter waveforms transmitted through said artery from said living body and outputting detection signals;
switching means for effecting recurrently switching and time-divisionally outputting outputs of said sensors;
determining and selecting means responsive to said switching means for determining one of said outputs in accordance with an output of said switching means and a predetermined Judging condition and for selecting and outputting said one of said outputs;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
calculating means for receiving said absolute values from said hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said one of said outputs from said determining and selecting means and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means. - View Dependent Claims (2, 3, 4)
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5. A noninvasive continuous blood pressure measuring apparatus comprising:
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oscillating means for generating an oscillation signal having a desired frequency and a desired amplitude;
an exciter arranged responsive to said oscillation signal for inducing an exciter waveform in an artery and a blood in said artery of a living body;
a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
calculating means for receiving absolute values from said calibration hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means. - View Dependent Claims (6, 7, 8, 9)
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10. A noninvasive continuous blood pressure measuring apparatus comprising:
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oscillating means for generating an oscillation signal having a desired frequency and a desired amplitude;
an exciter responsive to said oscillation signal for inducing an exciter waveform in an artery and a blood in said artery of a living body;
a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal;
an a/d converter for a/d-converting said detection signal;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
a microprocessor including filter means and calculating means, said filter means band-pass-filtering said detection signal from said a/d converter, said calculating means receiving said absolute values from said calibration hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal from said filter means and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means.
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11. A noninvasive continuous blood pressure measuring apparatus comprising:
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oscillating means for generating an oscillation signal having a desired frequency and a desired amplitude;
an exciter responsive to said oscillation signal for inducing an exciter waveform in an artery and a blood in said artery of a living body;
a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
bandpass filter means for band-pass-filtering said detection signal from said sensor;
an a/d converter for a/d-converting said detection signal from said bandpass filter means;
a microprocessor including calculating means for receiving said absolute values from said calibration hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal from said a/d converter and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means.
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12. A noninvasive continuous blood pressure measuring apparatus comprising:
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oscillating means for generating an oscillation signal of which frequency is controlled;
an exciter responsive to said oscillation signal for inducing an exciter waveform in an artery and a blood in said artery of a living body;
a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
frequency determining means responsive to said sensor for controlling said oscillating means to successively control said frequency at different frequencies, determining one of said difference frequencies in accordance with said detection signal outputted at different frequencies, and then, controlling said oscillating means to continuously generating said oscillation signal at said one of said different frequencies;
calculating means responsive to said frequency determining means for receiving absolute values from said calibration hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal at said one of said different frequencies and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means. - View Dependent Claims (13, 14, 15, 16)
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17. A noninvasive continuous blood pressure measuring apparatus comprising:
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oscillating means for generating an oscillation signal of which waveform is controlled;
an exciter responsive to said oscillation signal for inducing an exciter waveform in an artery and a blood in said artery of a living body;
a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal;
calibration hemadynamometer means for detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
waveform determining means responsive to said sensor for controlling said oscillation means to control said oscillation signal successively have different waveforms and determining one of said difference waveforms in accordance with said detection signal outputted at different waveforms and then, controlling said oscillating means to continuously generating said oscillation signal at said one of said different waveforms;
calculating means responsive to said frequency determining means for receiving absolute values from said calibration hemadynamometer means and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal at said one of said different waveforms and said absolute values; and
displaying means for displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted by said calculation means. - View Dependent Claims (18, 19, 20, 21)
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22. A method of noninvasively measuring continuous blood pressure comprising the steps of:
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(a) generating an oscillation signal of which frequency is controlled;
(b) providing an exciter responsive to said oscillation signal inducing an exciter waveform in an artery and a blood in said artery of a living body;
(c) providing a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and outputting detection signal;
(d) detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
(e) controlling said oscillation signal to successively control said frequency at different frequencies;
(f) determining one of said difference frequencies in accordance with said detection signal outputted at different frequencies;
(g) continuously generating said oscillation signal at said one of said different frequencies;
(h) receiving absolute values and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal at said one of said different frequencies and said absolute values; and
(i) displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted. - View Dependent Claims (23, 24, 25, 26)
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27. A method of noninvasively measuring continuous blood pressure comprising the steps of:
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(a) generating an oscillation signal of which waveform is controlled;
(b) providing an exciter responsive to said oscillation signal inducing an exciter waveform in an artery and a blood in said artery of a living body;
(c) providing a sensor arranged a predetermined interval apart from said exciter for receiving said induced exciter waveform transmitted through said artery from said living body and-outputting detection signal;
(d) detecting absolute values of a maximum blood pressure and a minimum blood pressure of said living body;
(e) controlling said oscillation signal to successively control said frequency at different waveforms;
(f) determining one of said difference waveforms in accordance with said detection signal outputted at different waveforms;
(g) continuously generating said oscillation signal at said one of said different waveforms;
(h) receiving absolute values and successively calculating and outputting an instantaneous blood pressure value from a phase relation between said oscillation signal and said detection signal at said one of said different waveforms and said absolute values; and
(i) displaying a continuous blood pressure variation from said instantaneous blood pressure successively outputted. - View Dependent Claims (28, 29, 30, 31)
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Specification