Ultrasonic Doppler blood flow velocity detection apparatus

Details Ultrasonic Doppler blood flow velocity detection apparatus Ultrasonic Doppler blood flow velocity detection apparatus

1989-05-22

1991-07-30

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 806

Patent

active

050352458

ABSTRACT:
An ultrasonic Doppler blood flow detection apparatus of the invention comprises: a transducing circuit for emitting ultrasonic waves at a predetermined interval and for receiving reflected ultrasonic waves from an object in the blood vessel and converting the received signal into an electric echo signal; a frequency-difference signal producing circuit for producing frequency-difference components between the echo signal and first pair of quadrature signals of a frequency f1 in response to the echo signal and the first pair of quadrature signals; first and second Doppler signal detection circuit for detecting first and second Doppler signals of upper and lower sidebands of the frequency f1 from the frequency-difference components in response to second pair of quadrature signals of a frequency f2; and a frequency difference calculation circuit for calculating frequency difference between output signals from the first and second Doppler signal detection circuits. The frequency difference indicates compressed Doppler shift frequency which can detect a higher velocity of blood flow.

REFERENCES:
patent: 4534357 (1985-08-01), Powers
patent: 4780837 (1988-10-01), Namekawa
patent: 4807636 (1989-02-01), Skidmore et al.
Namekawa, K. et al., "Doppler Signal Frequency Converter", EP 0166392, published 2/1/86.
Sainz, A. et al., "PLL Techniques Applied to UTS Doppler Signal Processing", Ultrasonics vol. 14, No. 3 May 1976.

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