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US 2001/0022182 A1Published application
Anaesthetic controller
AssigneeB. Braun Melsungen AG
InventorsRolf Heitmeier, Gerhard Niessner
Life of this patent
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AssigneeB. Braun Melsungen AG
InventorsRolf Heitmeier, Gerhard Niessner
Estimating the term…
For automatic supply of an active substance to a patient's body (14) the supply rate (R) of an infusion pump (13) is evaluated. The supply rate is processed in a patient model (11) which receives the corresponding active substance data from a drug data bank (12). The patient model (11) calculates the concentration (CNactual) in the patient's body from the former values of the active substance supply. Said actual concentration value is fed to a concentration controller (17) which also receives a desired concentration value (CNdesired). The infusion pump (13) is controlled as a function of the difference obtained. The desired concentration value can be manually set on an input device (19) or is supplied by another control portion which generates e. g. a BIS level or an adequate signal from the patient's EEG, the BIS level being a measure of the depth of anaesthesia.
Anaesthetic controller for influencing the rate of active substance supply to a patient's body (14) to attain and maintain a desired anaesthetic state, the controller comprising a model computing portion (10) calculating a current value of the present active substance concentration in the patient's body (CNactual) on the basis of a patient model (11) and taking into consideration former values (R) of the active substance supply, and comprising a control portion (16) changing the rate (R) of the active substance supply as a function of the current value (CNactual) of the present active substance concentration such that the present active substance concentration (CNactual) is controlled to attain a target value (CNdesired).
Dependencies are inferred from the claim text.