Limb blood flowmeter

Details Limb blood flowmeter Limb blood flowmeter

1978-04-21

1980-05-27

Michell, Robert W.

Surgery

Truss

Pad

128689, 128680, A61B 502

Patent

active

042045452

ABSTRACT:
A human limb to be examined is pressurized on the side of the heart to occlude the venous return alone for the measurement of admittance of the limb, and the measured initial admittance is retained and compared with subsequently measured admittance to detect a difference .DELTA.Y therebetween. The blood resistivity .rho., the length L of the limb segment to be examined and its tissue volume V.sub.O are respectively set, and .rho.L.sup.2 .DELTA.Y/V.sub.O is computated. The initial gradient of the computation result to time is indicative of the blood flow rate in the limb being examined.

REFERENCES:
patent: 3457909 (1969-07-01), Laird
patent: 3835839 (1974-09-01), Brown
patent: 3835840 (1974-09-01), Mount
patent: 3874368 (1975-04-01), Asrican
patent: 3958577 (1976-05-01), Rodler
patent: 3994284 (1976-11-01), Voelker
patent: 3996924 (1976-12-01), Wheeler
patent: 3996925 (1976-12-01), Djordjevich
Kubicek, W. G. et al., "The Minnesota Impedance Cardiograph Theory and Applications," Biomed. Engr., vol. 9, No. 9, Sep., 1974, pp. 410-416. _
Darling, R. C. et al., "Quantitative Segmental Pulse Volume Recorder," Surgery, Dec., 1972, vol. 72, No. 6, pp. 873-887.
Hokanson, D. E. et al., "An Electrically Calibrated Plethysmograph for Direct Measurement of Limb Blood Flow," IEEE Transactions on Biomed. Engr., vol. BME-22, No. 1, pp. 25-29, Jan., 1975.

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