Apparatus for observing blood flow patterns

Details Apparatus for observing blood flow patterns Apparatus for observing blood flow patterns

1984-08-21

1986-04-22

Howell, Kyle L.

Surgery

Truss

Pad

7386125, A61B 1000

Patent

active

045835527

ABSTRACT:
An apparatus for observing blood flow patterns by utilizing ultrasonic beams which includes at least a pulse generator, a transducer, first and second phase detectors, and a monitor. The ultrasonic beams are transmitted and received by the transducer to obtain echo signals reflected from the body. The echo signals are phase-detected by the first phase detector to derive pulsed Doppler signals. The pulsed Doppler signals are phase-detected by the second phase detector to derive phase difference signals between the sampled pulsed Doppler signals. The sampling periods are determined in accordance with a depth of the body along a travel path of the ultrasonic beams. The blood flow patterns of the blood cells of the body are displayed on the monitor by processing the phase difference signals.

REFERENCES:
patent: 4103679 (1978-08-01), Aronson
patent: 4205687 (1980-06-01), White et al.
patent: 4318413 (1982-03-01), Iinuma et al.
patent: 4324258 (1982-04-01), Huebscher et al.
patent: 4334543 (1982-06-01), Fehr

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