Method of determining a parameter indicative of the progress of

Details Method of determining a parameter indicative of the progress of Method of determining a parameter indicative of the progress of

1998-09-11

2000-08-29

Drodge, Joseph W.

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210 962, 210645, 210646, 210746, 604 401, B01D 6154

Patent

active

061103845

ABSTRACT:
A method is disclosed for determining a parameter (D, K, Kt/v, Cbin) indicative of the effectiveness of an extracorporeal blood treatment carried out using a membrane exchanger. The method includes the steps of flowing through the exchanger a treatment liquid having a concentration characteristic (Cd) and of varying the value of the characteristic (Cd) upstream of the exchanger for a time at the end of which the characteristic (Cd) is returned to a nominal value. A plurality of values adopted by the characteristic (Cd) downstream of the exchanger in response to the upstream variation is measured and stored in memory. The area (Sout) of a downstream perturbation region is determined, which is bounded by a baseline and a curve representing the variation of the measured values with respect to time. Then, the parameter (D, K, Kt/v, Cbin) indicative of the effectiveness of the treatment is calculated using the area (Sin) beneath the upstream curve and an area beneath an upstream curve.

REFERENCES:
patent: 5024756 (1991-06-01), Sternby
patent: 5100554 (1992-03-01), Polaschegg
patent: 5507723 (1996-04-01), Keshaviah
patent: 5567320 (1996-10-01), Goux et al.
patent: 5662806 (1997-09-01), Keshaviah et al.
patent: 5725773 (1998-03-01), Polaschegg
patent: 5900726 (1999-05-01), Brugger et al.

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