Apparatus for controlling the delivery of medical fluids
View Patent ↗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 ).
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, 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.
2. The apparatus according to claim 1 , characterized in that EEG measurement signals of the patient are assessed as the body effect, and from this, values are ascertained as a measure of the depth of hypnosis.
3. The apparatus according to claim 1 , characterized in that electrical measurement signals of the patient are assessed as the body effect, and from this, values are ascertained as a measure of the degree of muscular relaxation.
4. The apparatus according to claim 1 , characterized in that the extrapolation period for the medical fluid concentration extends over a period of from 3 minutes to 30 minutes.
5. The apparatus according to claim 1 , characterized in that the medical fluid is delivered intravenously or via the respiratory system.
6. The apparatus according to claim 2 , characterized in that the extrapolation period for the medical fluid concentration extends over a period of from 3 minutes to 30 minutes.
7. The apparatus according to claim 3 , characterized in that the extrapolation period for the medical fluid concentration extends over a period of from 3 minutes to 30 minutes.
8. The apparatus according to claim 2 , characterized in that the medical fluid is delivered intravenously or via the respiratory system.
9. The apparatus according to claim 3 , characterized in that the medical fluid is delivered intravenously or via the respiratory system.
10. The apparatus according to claim 4 , characterized in that the medical fluid is delivered intravenously or via the respiratory system.
11. The apparatus according to claim 1 , wherein the safety device extrapolates a future medical fluid concentration based on the assumption that the dosage from that moment on is stopped.
12. The apparatus according to claim 2 , wherein the safety device extrapolates a future medical fluid concentration based on the assumption that the dosage from that moment on is stopped.
13. The apparatus according to claim 3 , wherein the safety device extrapolates a future medical fluid concentration based on the assumption that the dosage from that moment on is stopped.
14. The apparatus according to claim 4 , wherein the safety device extrapolates a future medical fluid concentration based on the assumption that the dosage from that moment on is stopped.
15. The apparatus according to claim 5 , wherein the safety device extrapolates a future medical fluid concentration based on the assumption that the dosage from that moment on is stopped.