Cardiac flow monitor

Details Cardiac flow monitor Cardiac flow monitor

1984-10-01

1987-02-10

Howell, Kyle L.

Surgery

Truss

Pad

128634, 128664, 128689, 128692, 356 39, A61B 502

Patent

active

046416587

ABSTRACT:
Previously undesired artifacts in a color signal used in fiberoptic cardiac catheters to measure blood oxygenation levels are used to produce indications of blood flow and true pulse. For this purpose, the color signal is band-pass filtered to derive a DC mean signal level .mu. and an AC signal containing only those frequencies at which the signal is affected by blood flow variations. The RMS value of that band-pass-filtered AC signal (which corresponds to the standard deviation .sigma. of the AC signal) is divided by the DC value .mu. to produce a .sigma./.mu. signal representative of flood flow. By clipping the AC signal and using the resulting square wave to drive a one-shot multivibrator, an indication of the patient's true pulse can be obtained.

REFERENCES:
patent: 3646931 (1972-03-01), Phelps et al.
patent: 3704706 (1972-12-01), Herczfeld et al.
patent: 3998550 (1976-12-01), Konishi et al.
patent: 4167331 (1979-09-01), Nielsen
patent: 4201222 (1980-05-01), Haase
patent: 4306567 (1981-12-01), Krasner
patent: 4407290 (1983-10-01), Wilber
patent: 4509522 (1985-04-01), Manuccia et al.

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