Haemofiltration machine for independently controlling the concentration of a least two ionic substances in a patient's internal medium
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United States of America Patent
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Oct 21, 2003
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N/A
app pub date -
Nov 6, 2000
filing date -
Nov 8, 1999
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Abstract
A haemofiltration machine designed to work with a haemofilter comprises two compartments separated by a semipermeable membrane, one compartment having an inlet connected to a withdrawing tube for taking blood from the patient and an outlet connected to a blood return tube, the other having an outlet connected to a tube for removing used liquid. The machine itself comprises a solution generator for preparing a first injectable solution from at least one concentrated solution; a circulation pump for injecting the first solution at a flow rate of Q.sub.pre into the withdrawing tube; an infusion pump for injecting a patient with a second solution containing a ionic substance [A] with a fixed concentration [A].sub.post different from its concentration [A].sub.pre in the first solution; and a control unit for determining an infusion flow rate Q(post) for the second solution such that the concentration of the ionic substance [A] inside the patient tends towards a required concentration [A].sub.des, as a function of [A].sub.post, [A].sub.des, Q.sub.pre, and the blood flow rate Q.sub.B.
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