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Method and apparatus based on combination of physiological parameters for assessment of analgesia during anesthesia or sedation

Research output: PatentScientific


Original languageEnglish
Patent numberUS2005010116
IPCA61B 5/ 11 A I
Priority date7/07/03
Publication statusPublished - 13 Jan 2005
Externally publishedYes
Publication typeH1 Granted patent


The invention relates to a method for monitoring a condition of a patient under anesthesia or sedation, whereupon one, two, three or more signals are acquired, and the signal(s) represent(s) cardiovascular and/or combined electrical biopotential on skull activity of the patient. From said signal or signals are derived or calculated at least two parameter values related to a quantity like waveform amplitude, waveform periodicity, waveform morphology, waveform variability, energy, power, signal complexity and frequency content. A predetermined mathematical index for probability of patient comfort is used, in which function said parameters are variables, and successively changing probability index values of said mathematical index is calculated.