Heart pulse wave detecting device using iterative base point detection
First Claim
1. A heart pulse wave detecting device comprising:
- pulse wave detecting means for detecting a pulse wave of a living body;
means for differentiating a pulse wave output from said pulse wave detecting means and providing a differentiated wave;
first detecting means for detecting a descending zero-cross point of said differentiated wave;
second detecting means for detecting a maximum-slope point of the differentiated wave while tracing back from the descending zero-cross point;
third detecting means for detecting a peak of the pulse wave output from said pulse wave detecting means; and
fourth detecting means for detecting the base point of the pulse wave by tracing back from a maximum-slope point on said pulse wave corresponding to the maximum-slope point detected by said second detecting means.
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Accused Products
Abstract
A CPU of a control unit receives a blood pressure pulse wave signal, through an AC amplifier and an A/D convertor. The CPU differentiates, for the smoothing of the waveform, the heart pulse wave signal every step of decreasing the pressure in the cuff, thereby detecting a descending zero-cross point m of the differential wave. Further, the CPU detects a slope peak point P'"'"' while tracing back from the descending zero-cross point m. The CPU determines the peak points of the pulse wave by using the heart pulse wave signal that is not differentiated. Thereafter, the CPU determines the base points of the pulse wave tracing back from the maximum-slope point, determines the peak value of the heart pulse wave signal in all the steps of decreasing the pressure in the cuff, and finally computes a systolic blood pressure and a diastolic blood pressure.
75 Citations
6 Claims
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1. A heart pulse wave detecting device comprising:
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pulse wave detecting means for detecting a pulse wave of a living body; means for differentiating a pulse wave output from said pulse wave detecting means and providing a differentiated wave; first detecting means for detecting a descending zero-cross point of said differentiated wave; second detecting means for detecting a maximum-slope point of the differentiated wave while tracing back from the descending zero-cross point; third detecting means for detecting a peak of the pulse wave output from said pulse wave detecting means; and fourth detecting means for detecting the base point of the pulse wave by tracing back from a maximum-slope point on said pulse wave corresponding to the maximum-slope point detected by said second detecting means. - View Dependent Claims (2, 3)
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4. A heart pulse wave detecting method comprising the steps of:
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detecting a pulse wave of a living body; differentiating said pulse wave to produce a differentiated wave; detecting a descending zero-cross point of said differentiated wave; detecting a maximum-slope point of the differentiated wave while tracing back from the descending zero-cross point; detecting a peak point of the pulse wave; and detecting the base point of the pulse wave by tracing back from a maximum-slope point on said pulse wave corresponding to the maximum-slope point. - View Dependent Claims (5, 6)
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Specification