Surgery – Diagnostic testing – Measuring anatomical characteristic or force applied to or...
Patent
1997-10-14
1999-08-24
Hindenburg, Max
Surgery
Diagnostic testing
Measuring anatomical characteristic or force applied to or...
600503, A61B 500
Patent
active
059418370
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a device for measuring physical state in a patient based on the condition of circulation. More specifically, the present invention relates to a health management device for monitoring the user's state of health based on information obtained from the condition of circulation in the user's body, and to an exercise support device which provides appropriate suggestions and guidance to the user, or provides an exercise plan deemed appropriate to create a state of health in the user.
2. Background of the Invention
With the rapid aging of society in recent years, the health issues of middle aged and elderly persons, geriatric diseases being chief among these, have been a topic of much discussion. Various factors have been cited as causes of such diseases. As one example of these factors, evidence has been found which suggests that insufficient circulation can cause health problems. When circulation is insufficient, cells and tissues do not receive the necessary amount of oxygen and nutrients. When this situation persists for a long period of time, organic pathological changes begin to occur in organs and tissues. Once these changes have progressed to a certain extent, symptoms can appear quite suddenly.
Accordingly, various attempts have been made to prevent such diseases before there is significant progression in organic pathological change, by determining the quality of circulation, the basis for these pathological changes. Accordingly, it has been the practice until now to determine the quality of circulation by focusing on risk factors such as blood pressure, changes in the electrocardiogram, blood cholesterol, neutral fat concentration, and the like.
However, in reality, it is not uncommon for cerebral apoplexy or heart failure to occur even in an individual with low blood pressure, while there are examples of elderly persons who have high blood pressure but still are in good health. Similarly, there are numerous instances where a substantial organic pathological change has occurred, but nothing is observed in the electrocardiogram, etc. While examination equipment may discover this change if it progresses further, this is not acceptable because of the additional delay.
Accordingly, the discovery that acceleration pulse waveforms can be useful as an indicator of the quality of circulation has gained attention in recent years. A brief explanation of acceleration pulse wave as a measure of circulation will now be provided. Namely, as is well known, circulation basically involves the heart pumping out blood, which flows through the arteries to the capillaries of the tissues and organs, and then returns through the veins.
The supply of oxygen and nutrients takes place at the capillaries, so that the quality of circulation is correlated to the behavior of the blood in the smallest vessels. Accordingly, transitions in the amount of blood contained in the capillaries may be viewed to serve as a good measure of circulation. Namely, a slight difference in arterial and venal blood pressure give rise to fine differences in nutrient supply and gas exchange at the capillary level. It is for this reason that it is believed that organic pathological changes may occur in tissues and organs if the difference in arterial and venal blood pressure expands over a long period of time.
Accordingly, one widely used method for observing changes over time in the amount of blood contained in the capillaries is the examination of the fingertip plethysmogram. However, the fingertip plethysmogram itself displays a gently undulating waveform. Accordingly, it was considered difficult to interpret very fine changes in the waveform. Further, there has also been the problem that changes in circulation are very small, and are sensitive to changes in the organism s environment.
However, if the second derivative of the fingertip plethysmogram waveform is obtained, to convert the waveform to a double differential plethysmogram (i.e., the acceleration plethysmogram wa
REFERENCES:
patent: 4432374 (1984-02-01), Osani
patent: 5479939 (1996-01-01), Ogino
Amano Kazuhiko
Ishiyama Hitoshi
Uebaba Kazuo
Hindenburg Max
Janofsky Eric B.
Seiko Epson Corporation
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