Variable illumination of a lumen for acoustic blood flow measure

Details Variable illumination of a lumen for acoustic blood flow measure Variable illumination of a lumen for acoustic blood flow measure

1992-11-16

1994-11-15

Jaworski, Francis

Surgery

Truss

Pad

7386125, A61B 806

Patent

active

053638484

ABSTRACT:
In an acoustic flowmeter of the transit time or Doppler type the electro/acoustic, and/or acousto/electric, gain of one or more elongate acoustic transducers is varied spatially along the length of the transducer. When the transducer(s) are situated across the width of a lumen that is both flowing fluid and surrounded by material that attenuates sound differently that does the fluid during acoustic fluid flow measurement, the differing transducer(s') gain(s) serves to compensate for differing acoustic attenuations in different acoustic paths. Particularly during in-vivo acoustic blood flow measurement, the non-uniform acoustic gain(s) serves to compensate for the differing acoustic attenuations of blood and tissue, commonly fat, surrounding a blood vessel, and to produce a more accurate measurement of blood flow.

REFERENCES:
patent: 4431936 (1984-02-01), Fu et al.
patent: 4841492 (1989-06-01), Russell
patent: 4852576 (1989-08-01), Inbar et al.
patent: 4867167 (1989-09-01), Magnin
patent: 5052394 (1991-10-01), Carpenter et al.
patent: 5085220 (1992-04-01), Nudell et al.
patent: 5095909 (1992-03-01), Nakayama et al.

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