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Anaesthesia control system

  • US 6,934,579 B2
  • Filed: 10/09/2001
  • Issued: 08/23/2005
  • Est. Priority Date: 09/11/1996
  • Status: Expired due to Fees
First Claim
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1. A method of calculating an index indicative of anaesthetic depth, the method comprising:

  • subjecting a patient to a repetitive audio stimulus;

    monitoring auditory evoked potentials (AEP) produced by the patient;

    providing a signal corresponding to the coarseness of the monitored AEP signal, the coarseness of the signal being a single measure increasing and decreasing with both amplitude and frequency of variations in the signal AEP signal; and

    using said signal as said index indicative of anaesthetic depth.

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