Doppler effect blood flow sensing device displaying signals lyin

Details Doppler effect blood flow sensing device displaying signals lyin Doppler effect blood flow sensing device displaying signals lyin

1982-08-25

1984-12-04

Howell, Kyle L.

Surgery

Truss

Pad

A61B 1000

Patent

active

044858213

ABSTRACT:
A pulsed ultrasound Doppler blood flow sensing device includes a band pass filter for extracting only the Doppler frequency shift signals from the sampled and held signals, the band pass filter having a band pass characteristic in which a variation of an attenuation degree is almost flat over at least a frequency band between -f.sub.r /2 and +f.sub.r /2 except for a region in proximity to frequency O. A display displays blood flow signals which represent the obtained Doppler frequency shifts and have frequencies at least between the frequencies -f.sub.r and +f.sub.r.

REFERENCES:
patent: 3896788 (1975-07-01), Sato
patent: 4318413 (1982-03-01), Iinuma

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