Blood pressure measurement apparatus

Details Blood pressure measurement apparatus Blood pressure measurement apparatus

1986-05-15

1988-09-06

Jaworski, Francis J.

Surgery

Truss

Pad

36441303, A61B 502

Patent

active

047685190

ABSTRACT:
Disclosed is a blood pressure measurement apparatus in which a waveform discrimination method is used in the recognition of Korotkoff sounds in the measurement of blood pressure by auscultation. In processing executed by the apparatus, the minimum point or maximum point (C3) of a signal waveform indicative of the sound of vibration produced by a blood vessel is detected, and a maximum value or minimum value point (C2) is detected within a predetermined time region (t.sub.1) the final instant of which is the point (C3). If a level difference between the point (C2) and the point (C3) is within a predetermined range, there is detected a minimum value or maximum value point (C1) within a predetermined time region (t.sub.2) the final instant of which is (C2). If a level difference between the point (C1) and the point (C2) is within a predetermined range, there is detected a maximum value or minimum value point (C4) within a predetermined time region (t.sub.3) the starting instant of which is the point (C3). It is then discriminated whether a level difference between the point (C4) and the point (C3) falls within a predetermined range. Control proceeds in successive fashion when each of these conditions is satisfied, with a Korotkoff sound being recognized in the signal waveform when all of these conditions are satisfied.

REFERENCES:
patent: 3707959 (1973-01-01), Wilton-Davies
patent: 4313445 (1982-02-01), Georgi
patent: 4475557 (1984-10-01), Hatschek et al.
patent: 4501281 (1985-02-01), Furukawa
patent: 4592366 (1986-06-01), Sainomoto et al.
patent: 4677983 (1987-07-01), Yamaguchi et al.

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