Anesthesia Simulator and Controller for Closed-Loop Anesthesia
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Accused Products
Abstract
Methods, systems, and software are disclosed for simulating and controlling anesthesia delivery and for implementing automatic closed-loop anesthesia with an inhaled anesthetic agent. The methods involve using a physiological simulation to forward calculate the effects of an inhaled anesthetic agent, and searching for gas administration characteristics, such as fresh gas flow rates and anesthetic concentrations or partial pressures, that will achieve a desired physiological anesthetic concentration or effect with minimal use of anesthetic agent and minimal fresh gas flow rate.
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Citations
48 Claims
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1-28. -28. (canceled)
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29. A method for controlling the administration of an inhaled anesthetic agent, comprising:
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a) determining gas administration characteristics, including at least a gas administration characteristic for the inhaled anesthetic agent, that are likely to result in a desired physiological anesthetic concentration or effect by simulating the uptake and behavior of the inhaled anesthetic agent using a physiological simulation; and b) controlling the administration of one or more gases, including at least the inhaled anesthetic agent, to a patient in accordance with the gas administration characteristics obtained using the physiological simulation. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. An inhaled anesthetic controller, comprising:
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a) an interface adapted to allow the selection of a desired physiological concentration of an inhaled anesthetic agent or a desired physiological effect of the inhaled anesthetic agent; b) a physiological simulator adapted (1) to accept the desired physiological concentration or desired physiological effect, and (2) to determine one or more gas administration characteristics based on a physiological model of the uptake and behavior of the inhaled anesthetic agent to meet the desired physiological concentration or desired physiological effect; and c) an effector unit adapted to provide control signals to control the administration of one or more gases, including at least the inhaled anesthetic agent, in accordance with the determined gas administration characteristics. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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43. An anesthesia delivery system, comprising:
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a) an anesthesia circuit adapted to deliver a mixture of gases, including an inhaled anesthetic agent, to a patient and to recover expired gases from the patient; b) at least one sensor adapted to measure one or more characteristics of the mixture of gases; and c) an anesthetic controller, including; i) an interface adapted to allow the selection of a desired physiological concentration of the inhaled anesthetic agent or a desired physiological effect of the inhaled anesthetic agent, ii) a physiological simulator adapted (1) to accept the desired physiological concentration or desired physiological effect, and (2) to determine one or more gas administration characteristics based on a physiological model of the uptake and behavior of the inhaled anesthetic agent, and iii) an effector unit adapted to provide control signals to the anesthesia circuit to control the administration of the mixture of gases in accordance with the determined gas administration characteristics to meet the desired physiological concentration or desired physiological effect. - View Dependent Claims (44, 45, 46, 47, 48)
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Specification