Patent ID: 7445609

Claim:
An apparatus for varying the rate of medical fluid delivery to a patient for generating a desired body effect, having a medical fluid dosage unit for the medical fluid delivery; a patient model, which taking past values for medical fluid delivery into account calculates a current value of the medical fluid concentration in the body of the patient; a medical fluid regulating device for the medical fluid delivery, which as a function of the calculated current value of the medical fluid concentration and a control input furnishes a controlling variable for the dosage unit; a body effect calculation unit, which as a function of the difference between a target value for the body effect and a measured body effect forms the control input for the medical fluid regulating device; a safety device with a further patient model, which from past and/or current values of the medical fluid delivery extrapolates a future medical fluid concentration; a shutoff means, which acts on the dosage unit, for comparing the extrapolated medical fluid concentration with a predetermined limit value for the medical fluid concentration and for outputting a shutoff signal to the dosage unit if the limit value is exceeded.