Ultrasonic blood stream observing apparatus

Details Ultrasonic blood stream observing apparatus Ultrasonic blood stream observing apparatus

1987-09-16

1989-01-03

Jaworski, Francis J.

Surgery

Truss

Pad

128660, A61B 1000

Patent

active

047949333

ABSTRACT:
An ultrasonic blood stream observing apparatus based on a pulse Doppler method utilizing as a transmission, a high frequency pulse signal. The frequency f.sub.PRF of a transmission pulse repetition signal and the frequency f.sub.R of a reference signal used for demodulating a Doppler component of an observed signal, are synchronized to each other. The frequency f.sub.PRF is a harmonic frequency. The output of an oscillator is frequency-divided to produce the transmission pulse repetition signal. A frequency multiplier generates an output signal used as the reference signal, synchronized to the transmission pulse repetition signal. The frequency multiplier frequency multiplies by n its input signal obtained directly or indirectly from the oscillator.

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patent: 4660565 (1987-04-01), Shirasaka
Fundamentals Handbook of Electrical and Computer Eng. 1983, Wiley-Interscience pp. 204-205, Author Chang.

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