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US 8,078,333 B2Granted
Dialysis fluid heating algorithms
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorsRichard Kienman, Jennifer Lindsay, Gideon Hecht, Rodolfo Roger
Life of this patent
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Abstract
A dialysis fluid heating system includes a dialysis fluid heater; a dialysis fluid carrying element in operable communication with the dialysis fluid heater to heat a dialysis fluid; and a logic implementer configured to control the heater using (i) a heater input determined from a dialysis fluid temperature delta and a dialysis fluid flowrate, and (ii) a potential adjustment of the temperature delta using a measured dialysis fluid outlet temperature.
Claims20
A dialysis fluid heating system comprising:
- a dialysis fluid heater;
- a dialysis fluid carrying element in operable communication with the dialysis fluid heater to heat a dialysis fluid;
- and
- a logic implementer configured to control the heater using
- (i) a first heater input determined using a first feedforward determination at a first time from a first dialysis fluid temperature delta and a first dialysis fluid flowrate,
- (ii) a feedback adjustment of a second dialysis fluid temperature delta using a measured dialysis fluid outlet temperature and at least two of a proportional gain, integral gain and derivative gain;
- and
- (iii) a second heater input determined using a second feedforward determination at a second time from the second dialysis fluid temperature delta and a second dialysis fluid flowrate.
5 more elements
A dialysis fluid heating system comprising:
- a dialysis fluid heater;
- a dialysis fluid carrying element in operable communication with the dialysis fluid heater to heat a dialysis fluid;
- and
- a logic implementer configured to control the heater using
- (i) a first heater input determined using a first feedforward determination at a first time from (a) a first dialysis fluid temperature delta relating a desired dialysis fluid outlet temperature and a measured dialysis fluid inlet temperature and (b) a dialysis fluid flowrate, and
- (ii) a feedback adjustment using a feedback algorithm applied to a second dialysis fluid temperature delta relating the desired dialysis fluid outlet temperature and a measured dialysis fluid outlet temperature, wherein the feedback adjusted second dialysis fluid temperature delta is used to determine using a second feedforward determination at a second time a second heater input.
3 more elements
Dependencies are inferred from the claim text.