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US 10,117,985 B2Granted
Determining a volume of medical fluid pumped into or out of a medical fluid cassette
AssigneeFresenius Medical Care Holdings, Inc.
InventorsTri Ly, Jie Zhu, Kulwinder S. Plahey
Life of this patent
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Abstract
A method that includes pumping medical fluid out of or drawing medical fluid into a chamber of a medical fluid cassette, calculating a theoretical volume of fluid pumped out of or drawn into the chamber, and multiplying the theoretical volume of fluid pumped out of or drawn into the chamber by a correction factor to determine a corrected volume of fluid pumped out of or drawn into the chamber.
Claims19
A method comprising:
- (a) pumping a medical fluid out of or drawing a medical fluid into a chamber of a medical fluid cassette such that a pressure of the medical fluid in the medical fluid cassette causes a membrane of the medical fluid cassette to bulge around a perimeter of a piston head;
- (b) calculating, by a processor, a theoretical volume of the medical fluid pumped out of or drawn into the chamber;
- (c) measuring the pressure of the medical fluid within the medical fluid cassette or within a fluid line connected to the medical fluid cassette;
- (d) selecting a correction factor based on the measured pressure, the correction factor corresponding to an amount of bulging of the membrane of the medical fluid cassette;
- (e) multiplying, by the processor, the theoretical volume of the medical fluid pumped out of or drawn into the chamber by the correction factor to determine an adjustment volume;
- and
- (f) determining a corrected volume of the medical fluid pumped out of or drawn into the chamber based on the adjustment volume.
4 more elements
Dependencies are inferred from the claim text.