Surgery – Truss – Pad
Patent
1990-07-24
1992-08-18
Kamm, William E.
Surgery
Truss
Pad
128672, A61B 502
Patent
active
051390264
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pulse wave detecting apparatus.
BACKGROUND OF THE INVENTION
There is known a pulse wave detecting apparatus which detects a pulse wave using a pulse wave sensor which is pressed against an arterial vessel of a living body via a body surface with an optimum pressing force, the optimum pressing force being determined based upon a pulse wave detected by the pulse wave sensor while the pressing force applied to the pulse wave sensor is changed over a predetermined range.
In this pulse wave detecting apparatus, the pulse wave sensor is pressed against a wrist, for example. An optimum range of the pressing force applied to the pulse wave sensor within which a pulse wave having an appropriate magnitude is detected, is of considerably small width, in the case where the arterial vessel is positioned at a position nearer to the surface of the wrist than to the radius bone and tendon and for this reason the arterial vessel substantially is flattened before the pulse wave sensor is pressed toward the radius bone and tendon with a considerably great force, where the subject is so fat that the arterial vessel is positioned at a considerably deep position from the surface of the wrist, or where the arterial vessel is considerably thin. If this optimum pressing force range is considerably narrow, even a slight change in the pulse wave sensor pressing force, caused during the pulse wave detection, will lead to difficulty in detecting a pulse wave having an appropriate magnitude. This insufficient stability of detection of the pulse wave is due to the subject himself, not an error caused in the pulse wave detecting apparatus. For this reason, sufficient stability of detection of pulse wave cannot be obtained by re-activating the pulse wave detecting apparatus. In these cases, therefore, it is required to promptly identify that the stability of detection of pulse wave is insufficient due to the subject himself and take an appropriate measure on the subject, for example moving the hand inward about the wrist.
The present invention has been developed in the above-indicated situation. It is therefore an object of the present invention to provide a pulse wave detecting apparatus capable of identifying that stability of detection of pulse wave is insufficient due to a living body itself.
DISCLOSURE OF THE INVENTION
The above-indicated object has been achieved by the present invention, which provides a pulse wave detecting apparatus of the above-indicated type which, as shown in FIG. 1 corresponding to claims, is characterized by including (a) amplitude determining means for determining an amplitude of each of pulses of the pulse wave which are detected by the pulse wave sensor while the pressing force applied to the pulse wave sensor is changed, (b) first pressing force range determining means for determining a first pressing force range within which change of the amplitudes of the pulses determined by the amplitude determining means with respect to the pressing force is smaller than a predetermined value, (c) minimum value determining means for determining a minimum value of the each of pulses of the pulse wave which are detected by the pulse wave sensor while the pressing force is changed, (d) second pressing force range determining means for determining a second pressing force range within which change of the minimum values of the pulses determined by the minimum value determining means with respect to the pressing force is smaller than a predetermined value, (e) pulse wave detection stability judging means for judging whether or not stability of detection of pulse wave is insufficient due to the living body itself, based upon the first pressing force range determined by the first pressing force range determining means and the second pressing force range determined by the second pressing force range determining means, and (f) abnormality signal generating means for generating an abnormality signal representing that the stability of detection of pulse wave is insu
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Colin Electronics Co., Ltd.
Kamm William E.
Pontius Kevin
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