Ultrasonic doppler blood flow velocity detection apparatus and a

Details Ultrasonic doppler blood flow velocity detection apparatus and a Ultrasonic doppler blood flow velocity detection apparatus and a

1989-04-21

1990-10-30

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 806

Patent

active

049661531

ABSTRACT:
An ultrasonic Doppler blood flow velocity detection apparatus comprises: a pulse generation circuit for generating pulses at a predetermined interval; a transducer for transmitting ultrasonic waves in response to each of the pulses and for receiving reflected ultrasonic waves from a reflective object in the blood of a human body and converting the received ultrasonic waves into an electric echo signal; an extraction circuit for extracting signal components of first and second frequencies f1 and f2; a signal producing circuit for producing a signal having a frequency of .vertline.f1-f2.vertline. using output signals of the extraction circuit; a detection circuit for detecting amplitude of an output signal of the frequency difference signal producing circuit circuit and for phase-comparing the output signal with a reference signal; and a reference signal generation circuit for generating the reference signal of a predetermined frequency fr in response to each of the pulses, the predetermined frequency fr being approximately equal to the frequency difference .vertline.f1-f2.vertline.. The invention also discloses a method for detecting blood flow velocity.

REFERENCES:
patent: 4534357 (1985-08-01), Powers
patent: 4751847 (1988-06-01), Katakura et al.
patent: 4780837 (1988-10-01), Namekawa

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