Apparatus for controlling the delivery of medical fluids
First Claim
1. 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 and which performs a comparison of the extrapolated medical fluid concentration with a predetermined limit value for the medical fluid concentration and is embodied to output a shutoff signal to the dosage unit if the limit value is exceeded.
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Accused Products
Abstract
An apparatus for medical fluid delivery is to be improved for the sake of simple monitoring of the quantity of medical fluid delivered. For attaining this object, a safety device (15) with a patient model (16) is provided, which from past values and current values of the dosage rate of the medical fluid extrapolates a future medical fluid concentration (17) and switches off the dosage unit (10) for the medical fluid if the extrapolated medical fluid concentration (17) exceeds a predetermined limit value (14).
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Citations
10 Claims
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1. 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 and which performs a comparison of the extrapolated medical fluid concentration with a predetermined limit value for the medical fluid concentration and is embodied to output a shutoff signal to the dosage unit if the limit value is exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification