Blood pulse wave detecting apparatus and motion intensity measur

Surgery – Diagnostic testing – Cardiovascular

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600485, A61B 502

Patent

active

060223219

ABSTRACT:
An apparatus for detecting pulse waves and motion intensity of a living body in motion is disclosed. The apparatus has photosensors of the photo-coupler type for wavelengths of 660 nm and 940 nm, respectively. The sensors are attached to a person under examination, and provide output signals which include a blood pulse signal as well as body motion components superimposed on the blood pulse signal. These signals are subjected to the Fourier transformation in a fast Fourier transformation circuit, and then applied to a comparator which in turn compares amplitudes of major frequency components (components associated with pulse waves and body motion) to one another. According to the comparison result, a decision circuitdiscriminates the pulse wave from the body motion. A display unit displays the pulse rate corresponding to the fundamental frequency of the detected pulse wave. The display unit also displays the change in motion intensity detected by the decision circuit. Thus, the present invention allows the detection of the change in motion intensity during the exercise of a person under the examination.

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patent: 4934372 (1990-06-01), Corenman et al.
patent: 4951679 (1990-08-01), Harada
patent: 4955379 (1990-09-01), Hall
patent: 5101828 (1992-04-01), Welkowitz et al.

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