Method and apparatus for developing intermittent venous blood fl

Details Method and apparatus for developing intermittent venous blood fl Method and apparatus for developing intermittent venous blood fl

1977-05-23

1979-01-16

Kamm, William E.

Surgery

Truss

Perineal

A61B 502

Patent

active

041343964

ABSTRACT:
Normal steady venous return flow in a limb is rendered intermittent by means to occlude the venous system in the limb for a first period of time while permitting pulsatile arterial inflow to the limb. Means to release the venous system for a second period of time allows a rapid exponentially decreasing outflow of the blood that was pooled in the venous system during the first period. The exponentially decreasing outflow may be detected by a flowmeter responsive only to pulsatile flow. The flowmeter may also detect unwanted heart-synchronized signals. The latter may be cancelled from the venous blood flow signal by detecting and storing heart-synchronized signals during at least a part of the first period (of zero venous flow) and subtracting the stored signals from signals detected during the second period.

REFERENCES:
patent: 3507270 (1970-04-01), Ferrier
patent: 3659591 (1972-05-01), Doll
patent: 3751980 (1973-08-01), Fryer
patent: 3920004 (1975-11-01), Nakayama

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