Method and apparatus for the estimation of anesthesia depth

Details Method and apparatus for the estimation of anesthesia depth Method and apparatus for the estimation of anesthesia depth

2008-04-17

2009-10-13

Mallari, Patricia (Department: 3735)

Surgery

Diagnostic testing

Cardiovascular

C600S521000, C600S544000, C600S545000, C600S300000

Reexamination Certificate

active

07603168

ABSTRACT:
A method and apparatus to monitor and control the anesthesia state of a patient undergoing general anesthesia is provided. Previous automated systems to monitor the anesthesia state of a patient undergoing general anesthesia involve a significant time delay between the patient's true anesthesia state and the computed indices. The present invention reduces this time delay by using a novel analysis technique applied to spontaneous electrophysiological activity. A transformation and statistical analysis of the observed electrophysiological activity is conducted and compared to reference data to provide numerical indicators. In addition, these indicators are consistent with the levels of depression of patients CNS and ANS states. This method is illustrated in detail by CNS monitoring of electroencephalogram signals.

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