Arrangement and process for controlling a numerical value for patient respiration
First Claim
1. A patient respiration numerical value control circuit arrangement comprising:
- a respiration circuit with a Y-piece for delivering a gaseous anesthetic mixture to the lungs of a patient connected thereto;
a metering device for metering at least one anesthetic in the gaseous anesthetic mixture;
an electroencephalogram (EEG) control with an EEG sensor connected to the brain of the patient via head electrodes for measuring an EEG actual value, a EEG set point transducer for sending an EEG set point, an EEG comparison point, which forms the difference between the EEG actual value and the EEG set point, and a EEG controller, which forms a manipulated variable from the difference for the metering device so that when the EEG set point is exceeded by the EEG actual value, the percentage of at least one anesthetic in the gaseous anesthetic mixture is increased by the metering device and when the EEG actual value drops below the EEG set point, the percentage of at least one anesthetic in the gaseous anesthetic mixture is reduced by the metering device until the EEG actual value and the EEG set point agree.
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Accused Products
Abstract
An arrangement with a control circuit for controlling a numerical value for patient respiration as well as to a process for controlling the numerical value. The numerical value is controlled on the basis of an evaluation of the EEG (electroencephalogram) of the patient (1) by an EEG sensor (2), e.g., by determining the so-called BIS (bispectral index). A control of the inspiratory gaseous anesthetic concentrations is cascaded to the control of the EEG value in the manner of a cascade circuit. This has the advantage that a metering device (6) belonging to the arrangement meters a gaseous anesthetic mixture directly according to the patient'"'"'s needs. As an alternative, the control of the numerical value is performed on the basis of an evaluation of the expiratory gaseous anesthetic concentrations resolved for individual breaths at the Y-piece (19) of the respiration circuit (12) by a gaseous anesthetic sensor (8a), preferably an infrared optical gas sensor.
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Citations
18 Claims
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1. A patient respiration numerical value control circuit arrangement comprising:
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a respiration circuit with a Y-piece for delivering a gaseous anesthetic mixture to the lungs of a patient connected thereto;
a metering device for metering at least one anesthetic in the gaseous anesthetic mixture;
an electroencephalogram (EEG) control with an EEG sensor connected to the brain of the patient via head electrodes for measuring an EEG actual value, a EEG set point transducer for sending an EEG set point, an EEG comparison point, which forms the difference between the EEG actual value and the EEG set point, and a EEG controller, which forms a manipulated variable from the difference for the metering device so that when the EEG set point is exceeded by the EEG actual value, the percentage of at least one anesthetic in the gaseous anesthetic mixture is increased by the metering device and when the EEG actual value drops below the EEG set point, the percentage of at least one anesthetic in the gaseous anesthetic mixture is reduced by the metering device until the EEG actual value and the EEG set point agree. - View Dependent Claims (2, 3, 4, 5)
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6. A control process, comprising the steps of:
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providing a metering device for metering at least one anesthetic in the gaseous anesthetic mixture measuring an electroencephalogram (EEG) actual value with an EEG sensor;
sending an EEG set point from a EEG set point transducer;
forming a difference at an EEG comparison point from the EEG actual value and the EEG set point;
generating a manipulated variable with an EEG controller from the difference for controlling the metering device so that when the EEG set point is exceeded by the EEG actual value, the percentage of at least one anesthetic in the gaseous anesthetic mixture is increased by the metering device and when the EEG actual value drops below the EEG set point, the percentage of at least one anesthetic in the gaseous anesthetic mixture is reduced by the metering device until the EEG actual value and the EEG set point agree. - View Dependent Claims (7, 8, 9)
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10. An arrangement with a control circuit for controlling a numerical value for patient respiration, the arrangement comprising:
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a respiration circuit for delivering a gaseous anesthetic mixture to the lungs of a patient connected thereto via a Y-piece;
a metering device for metering at least one anesthetic in the gaseous anesthetic mixture;
a unit for controlling a physiological parameter of the patient, comprising a sensor for measuring an actual value of the physiological parameter of the patient;
a set point transducer for the physiological parameter of the patient for sending a set point for the physiological parameter of the patient;
a comparison element forming a difference between the actual value of the physiological parameter of the patient and the set point of the physiological parameter of the patient;
a controller for controlling the metering device so that when the set point of the physiological parameter of the patient is exceeded by the actual value of the physiological parameter of the patient, the percentage of at least one anesthetic in the gaseous anesthetic mixture is increased by the metering device, and when the actual value of the physiological parameter of the patient drops below the set point of the physiological parameter of the patient, the percentage of at least one anesthetic in the gaseous anesthetic mixture is reduced by the metering device until the actual value of the physiological parameter of the patient and the set point of the physiological parameter of the patient agree. - View Dependent Claims (11, 12, 13, 14, 16, 17, 18)
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15. A process for controlling a numerical value, the process comprising:
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measuring an actual value of a physiological parameter of the patient with a sensor for the physiological parameter of the patient;
sending a set point of the physiological parameter of the patient with a set point transducer for the physiological parameter of the patient;
forming the difference between the actual value of the physiological parameter of the patient and the set point of the physiological parameter of the patient at a comparison point for the physiological parameter of the patient; and
generating a manipulated variable from the difference by a controller of the physiological parameter of the patient for controlling the metering device including;
increasing a percentage of at least one anesthetic in the gaseous anesthetic mixture when the set point of the physiological parameter of the patient is exceeded by the actual value of the physiological parameter of the patient; and
reducing the percentage of at least one anesthetic in the gaseous anesthetic mixture when the actual value of the physiological parameter of the patient drops below the set point of the physiological parameter of the patient until the actual value of the physiological parameter of the patient and the set point of the physiological parameter of the patient agree.
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Specification