Ultrasonic Doppler diagnostic device

Details Ultrasonic Doppler diagnostic device Ultrasonic Doppler diagnostic device

1985-03-28

1987-03-24

Coven, Edward M.

Surgery

Truss

Pad

7386125, A61B 1000

Patent

active

046517456

ABSTRACT:
An ultrasonic diagnostic device for measuring the velocity of blood flow within a living body comprises a transmitter for transmitting an ultrasonic wave into the body, a receiver for amplifying the part of the ultrasonic wave reflected from the body, converting it into an electric signal and amplifying the signal in accordance with a logarithmic amplification characteristic, a converter circuit which receives the amplified signal from the receiver and a reference signal from the transmitter and outputs a signal corresponding to the ratio of the component of the reflected ultrasonic wave attributable to the blood flow and the component thereof attributable to the wall of the blood vessel through which the blood flows, an extraction circuit which receives the amplified signal from the receiver and outputs a signal corresponding to the component attributable to the wall of the blood vessel, and an arithmetic circuit which multiplies the signals output by the converter circuit and the extraction circuit, whereby there is obtained a signal corresponding to the velocity of the blood flow.

REFERENCES:
patent: 4095597 (1978-06-01), Hassler

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