Appeal No. 95-3830
Application No. 07/942,460
used dialysis liquid, computes a clearance value for a type of
impurity based on the measured data, compares the calculated
clearance with a predetermined clearance, and performs various
control functions based on the results of the comparison.
Claim 12 concerns controlling a flow rate through the
extracorporeal blood circuit. Claim 17 concerns controlling a
flow rate through the dialysis liquid circuit. Claim 22 concerns
controlling a blood filtrate exacting means on the basis of a
duration of treatment calculated on the basis of the results of
the comparison.
Representative claim 12 is reproduced below:
12. An artificial kidney comprising:
an exchanger having two compartments separated by
a semipermeable membrane, a first compartment being
connected to a circuit for extracorporeal circulation
of blood having a circulating pump disposed therein, a
second compartment being connected to a dialysis liquid
circuit;
measurement means for measuring data corresponding
to at least one physicochemical characteristic of a
fresh dialysis liquid and at least one physicochemical
characteristic of a used liquid;
computation means responsive to data received from
the measurement means for calculating an actual
clearance of the artificial kidney for a type of
impurity; and
control means for controlling a flow rate through
the extracorporeal blood circuit as a function of a
comparison between the calculated clearance and a
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