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US 5,623,933 AGranted
Pulse wave analysis device
AssigneeSeiko Epson Corporation
InventorsKazuhiko Amano, Hiromitsu Ishii, Kazuo Kodama
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AssigneeSeiko Epson Corporation
InventorsKazuhiko Amano, Hiromitsu Ishii, Kazuo Kodama
Estimating the term…
A pulse wave analysis device for analyzing the condition of a human body is disclosed. A cuff band is wrapped around the tip of the second finger of a subject's hand. When the operator depresses the beginning-of-measurement key, the finger tip is pressed at various pressures by means of an air pump and a pressure sensor. Pulse wave signals at different pressure values are automatically measured by an optical fingertip plethysmogram sensor. The signals are transmitted to a CPU through a BPF, an amplifier, and an ADC. The CPU performs FFT analyses on the signals and determines to which pattern from among the patterns stored in a ROM the pattern level of the pulse wave spectrum for a given pressure value is closest, and displays the result on a display unit as a test result indicating the viscoelasticity of the subject's peripheral circulation tissue.
A pulse wave analysis device comprising:
A pulse wave analysis device comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
Sensor mounted on worn items: wristwatch-type devices
Detecting, measuring or recording by applying mechanical forces or stimuli: by applying pressure, e.g. compression, indentation, palpation,…
Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow: evaluating blood…
From analysis of pulse wave characteristics: of pulse wave amplitude
Term ended 3 Aug 2014 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention generally relates to pulse wave analysis devices. More particularly, it relates to pulse wave analysis devices that analyze the condition of a living body such as a human body based on pulse waves obtained from the body.
2. Background Art
Other objects and attainments together with a fuller understanding of the invention will become apparent and appreciated by referring to the following description and claims taken in conjunction with the accompanying drawings.
FIG. 1 shows the configuration of the pulse wave analysis device according to the first embodiment of the present invention.
FIG. 2 is a graph of pulse waveforms at a specified pressure value for the above embodiment.
The following is an explanation of the embodiments of the present invention with reference to drawings.
Pulse waves are information that can be measured, either invasively or non-invasively, on a human body. Non-invasive methods for the determination of pulse waves include the determination of change in the lateral pressure in the blood vessel as a function of the output of blood from the heart and the determination of change in blood volume in a blood vessel. Specific means of detection that are employed include light (visible and near-infrared), sound (audible and ultrasonic), and electromagnetic waves.
The embodiments described below are based on the above research results conducted by the inventors. Specifically, they are designed to exploit the following: