Apparatus for measuring relative changes in blood volume in a po

Details Apparatus for measuring relative changes in blood volume in a po Apparatus for measuring relative changes in blood volume in a po

1973-06-21

1982-02-09

Kamm, William E.

Surgery

Truss

Pad

A61B 500

Patent

active

043145639

ABSTRACT:
An apparatus is provided which can assist in determining the presence or absence of a venous obstruction such as occurs in hemorrhage or inflammatory conditions affecting the veins by measuring the precentage change in electrical impedance of the veins caused by their temporary forced blockage. This measured change in impedance, normalized with respect to a baseline impedance measured during normal respiration, provides a sensitive index which is indicative of the presence or absence of a clot or constriction.

REFERENCES:
patent: 2841149 (1958-07-01), Marsden
patent: 3298362 (1967-01-01), Lippitt, Jr. et al.
patent: 3621836 (1971-11-01), Nagatomi
Mullick et al., "The American Journal of Surgery", vol. 119, Apr., 1970, pp. 417-422.

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