Pulse wave detecting apparatus

Details Pulse wave detecting apparatus Pulse wave detecting apparatus

1990-04-13

1992-06-09

Pellegrino, Stephen C.

Surgery

Truss

Pad

128687, 128690, A61B 502

Patent

active

051198223

ABSTRACT:
A pulse wave detecting apparatus including a pulse wave sensor; a pressing device for pressing the sensor against an arterial vessel of a subject, while varying the pressing force; a first device for determining an amplitude of each of pulses of pulse wave which are detected by the sensor while the pressing force is varied; a second device for determining, based on the determined pulse amplitudes, a first range of the pressing force within which the pulse amplitudes are generally constant, the first range including a point at which a rate of change of the pulse amplitudes with respect to the pressing force is zero; a third device for determining a minimum value of each of the pulses detected by the sensor; a fourth device for determining, based on the determined pulse minimum magnitude, a second range of the pressing force within which the pulse minimum magnitudes are generally constant, the second range including a point at which a rate of change of the pulse minimum magnitudes with respect to the pressing force is minimum; a fifth device for determining an optimum range of the pressing force based on the first and second ranges, and determining an optimum value of the pressing force such that the optimum value falls within the optimum range; and a sixth device for adjusting the pressing device to the optimum pressing force, and obtaining a pulse wave of the subject through the sensor pressed with the optimum pressing force.

REFERENCES:
patent: 4461266 (1984-07-01), Hood, Jr. et al.
patent: 4799491 (1989-01-01), Eckerle
patent: 4836213 (1989-06-01), Wenzel et al.
patent: 4947855 (1990-08-01), Yokoe et al.
patent: 4951679 (1990-08-01), Harada

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