Device for determining the depth of anesthesia
First Claim
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1. A method for determining a depth of anesthesia of a patient to whom at least one anesthetic drug was administered, the method comprising the steps of:
- firstly, acquiring (10) a plurality of successive signals representing a cardiac activity of the patient;
secondly, detecting (12) a periodic wave determined for the plurality of successive signals representing the cardiac activity of the patient;
thirdly, calculating (13) time intervals between successive periodic waves;
fourthly, determining (14) a digital series of the time intervals;
fifthly, calculating (15) a fractal dimension of the determined digital series of the time intervals; and
sixthly, calculating (16) a depth of anesthesia of the patient as a function of the fractal dimension.
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Abstract
A method comprising a step (10) of acquiring a patient heart activity signal, a signal shaping step (11) comprising a step (19) of converting the analog signal into a digital signal, a step (12) of sensing a periodic wave in the signal, a step (13) of calculating time intervals between the periodic waves, a step (14) of determining digital time interval series, a step (15) of calculating a fractal dimension of the digital series, and a step (16) of calculating the depth of anesthesia on the basis of the fractal dimension.
43 Citations
28 Claims
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1. A method for determining a depth of anesthesia of a patient to whom at least one anesthetic drug was administered, the method comprising the steps of:
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firstly, acquiring (10) a plurality of successive signals representing a cardiac activity of the patient; secondly, detecting (12) a periodic wave determined for the plurality of successive signals representing the cardiac activity of the patient; thirdly, calculating (13) time intervals between successive periodic waves; fourthly, determining (14) a digital series of the time intervals; fifthly, calculating (15) a fractal dimension of the determined digital series of the time intervals; and sixthly, calculating (16) a depth of anesthesia of the patient as a function of the fractal dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device for determining a depth of anesthesia in a patient to whom at least one anesthetic substance was administered, the device comprising:
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means (31) for acquiring a plurality of signals representing the cardiac activity of the patient; means (32) for configuring the plurality of signals representing a cardiac activity of the patient; means (33) for determining periodic waves for each of the configured plurality of signals representing the cardiac activity of the patient; means (34) for calculating a temporal position of the determined periodic waves; means (35) for measuring time intervals between the determined periodic waves; means (36) for forming a digital series containing a given number of time intervals; means (37) for calculating a fractal dimension for the digital series; means (38) for calculating a coefficient of normalization and calculating a depth of anesthesia as a function of the fractal dimension; and means (40) for displaying the depth of anesthesia. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification