Surgery – Diagnostic testing – Cardiovascular
Reexamination Certificate
1999-11-23
2001-04-17
Hindenburg, Max (Department: 3736)
Surgery
Diagnostic testing
Cardiovascular
C600S483000, C600S310000
Reexamination Certificate
active
06217523
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a blood pulse wave detecting apparatus and motion intensity measuring apparatus which can perform accurate and reliable detection of the blood pulse rate, blood pulse waves, or motion intensity of a living body even if the living body is in motion.
2. Description of the Related Art
There are various types of known apparatus for detecting the blood pulse rate or blood pulse waves of a living body. However, most of these apparatus can provide accurate detection only when a living body is at rest. This is because if the living body moves, both blood pulse wave and body movement are detected, and it is impossible to extract the blood pulse wave.
The detection of the blood pulse rate or blood pulse waves of a living body is very important for control of exercise or for health care. Therefore, there is a great need for accurate blood pulse detection of a living body in motion.
In one of conventional blood pulse rate detectors as disclosed in Japanese Patent Publication No. 63-34731, when a pulse showing a deviation from an average value by an amount greater than an allowable limit is detected, the detection is cancelled so that only normal pulses can be detected. With this apparatus, extraordinary pulses which arise when a living body moves slightly for a short time can be effectively cancelled, and thus only normal pulses can be detected.
In the conventional apparatus, however, if the living body makes continuous motions, the pulse will change very often and thus the detection will be cancelled so often that accurate detection of pulses is impossible.
If the motion intensity of a living body in motion, in particular of a human body can be measured, it will be possible to advantageously control the amount of motion. However, conventional techniques cannot measure the intensity of motion.
OBJECTS OF THE INVENTION
Therefore, it is an object of the present invention to overcome the aforementioned problems.
In view of the above, it is an object of the present invention to provide a blood pulse wave detecting apparatus which can distinguish blood pulses from body motion.
It is another object of the present invention to provide a motion intensity detecting apparatus for detecting the motion intensity of a living body.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention, there is provided a blood pulse wave detecting apparatus comprising: light detecting circuit for detecting the amount of light transmitted through or reflected from a living body illuminated with light having different wavelengths; and discrimination circuit for making comparison of amplitudes of frequency components associated with each wavelength, wherein the frequency components are included in a detected signal provided by the light detecting circuit, thereby discriminating a blood pulse wave of the living body from its body motion wave according to the relationships between the ratios of the amplitudes of frequency components.
According to a second aspect of the present invention, there is provided a motion intensity measuring apparatus comprising: light detecting circuit for detecting the amount of light transmitted through or reflected from a living body illuminated with light having different wavelengths; discrimination circuit for making comparison of amplitudes of frequency components associated with each wavelength wherein the frequency components are included in a detected signal provided by the light detecting means, thereby discriminating a blood pulse wave of the living body from its body motion wave according to the relationships between the ratios of the amplitudes of frequency components; and measuring circuit for making comparison of amplitudes of body motion associated with the different wavelengths, wherein the amplitudes have been discriminated by the discrimination circuit, thereby measuring the motion intensity of the living body according to the change in the ratio of the amplitudes of body motion.
According to a third aspect of the present invention, there is provided a motion intensity measuring apparatus comprising: light detecting circuit for detecting the amount of light transmitted through or reflected from a living body illuminated with light having different wavelengths; discrimination circuit for making comparison of amplitudes of frequency components associated with each wavelength wherein the frequency components are included in a detected signal provided by the light detecting circuit, thereby discriminating a blood pulse wave of the living body from its body motion wave according to the relationships between the ratios of the amplitudes of frequency components; and measuring circuit for making comparison of the amplitude of the body motion to the amplitude of the blood pulse wave, wherein the amplitudes of the body motion and blood pulse wave have been discriminated by the discrimination circuit, thereby measuring the motion intensity of the living body according to the change in the ratio between the amplitudes.
According to a fourth aspect of the present invention, there is provided a motion intensity measuring apparatus based on the second or third aspect, wherein light having a wavelength at which the absorbance of oxygen hemoglobin is equal to that of reduced hemoglobin is used as one of the light having different wavelengths, and wherein the measuring circuit employs the amplitude of a blood pulse wave included in a detected signal associated with this light as a reference value, and compares the amplitude of a blood pulse wave included in a detected signal associated with another light to the reference value, thereby measuring the motion intensity of a living body.
According to a fifth aspect of the present invention, there is provided a motion intensity measuring apparatus based on the second, third, or fourth aspect, wherein at least one of circuits including the light detecting circuits, the discrimination circuits and the measuring circuit is adapted to be supplied with electric power only when measurement is carried out.
According to a sixth aspect of the present invention, there is provided a motion intensity measuring apparatus based on the second, third, or fourth aspect, wherein at least one of circuits including the light detecting circuit, the discrimination circuit and the measuring circuit is adapted to be supplied with electric power only when measurement is carried out at measurement timing which has been set in an intermittent fashion.
According to a seventh aspect of the present invention, there is provided a motion intensity measuring apparatus based on the fifth or sixth aspect, wherein the electric power is supplied in a pulse current form.
According to an eighth aspect of the present invention, there is provided a blood pulse wave detecting apparatus comprising: light detecting circuit for detecting the amount of light transmitted through or reflected from a living body illuminated with light having different wavelengths; frequency analyzing circuit for performing frequency analysis on a detected signal provided by the light detecting circuit, for each the light having the different wavelengths; and blood pulse frequency identifying circuit for identifying the blood pulse frequency of the living body by determining which one of predefined modes the analysis result provided by the frequency analyzing circuit belongs to.
According to a ninth aspect of the present invention, there is provided a blood pulse wave detecting apparatus comprising: light detecting circuit for detecting the amount of light transmitted through or reflected from a living body illuminated with light having different wavelengths; Fourier transformation circuit for performing Fourier transformation on a detected signal provided by the light detecting circuit for each light having different wavelengths; and blood pulse frequency identifying circuit for identifying the blood pulse frequency of the living body by comparing spectra provided by the Fourier transformation circuit for
Amano Kazuhiko
Hayakawa Motomu
Kitazawa Koji
Carter Ryan
Gabrik Michael T.
Hindenburg Max
Seiko Epson Corporation
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