Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1995-05-31
1996-10-29
Wieder, Kenneth A.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
7386111, G01N 2708
Patent
active
055700268
ABSTRACT:
A differential conductivity recirculation monitor quantitatively determines the degree of recirculation in a fistula by comparing the conductivity of blood entering the fistula to the conductivity of blood being withdrawn from the fistula. A discrete quantity of a high conductivity marker fluid is injected into the blood entering the fistula, altering the conductivity of the blood entering the fistula. The altered conductivity blood enters the fistula and, if recirculation is present, co-mingles with blood in the fistula, altering the conductivity of the blood in the fistula in proportion to the degree of recirculation. Blood withdrawn from the fistula has an altered conductivity related to the degree of recirculation. Quantitative values of the conductivity of the altered conductivity blood entering the fistula and the conductivity of the blood being withdrawn from the fistula are measured and a difference determined. The determined difference between the conductivities is used to determine a quantitative measurement of the degree of recirculation in the fistula.
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Brugger James M.
Buffaloe, IV George W.
Ogawa Francis T.
Brown Glenn W.
Cobe Laboratories, Inc.
Wieder Kenneth A.
Winsor Bruce R.
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