Contents

1. Method for Fast Amplifier Recovery

2. Method for Dynamic Compensation of Bioelectric Electrode Impedances

3. System and Method for High-Speed Determination of Bioelectric Electrode Impedances

4. Automated insomnia treatment system

5. Alertness and drowsiness detection and tracking system

Method for Fast Amplifier Recovery <back to top>

Abstract: The present system and method are used to improve the ability of high-gain AC-coupled EEG or other bio-signal amplifiers to rapidly recover from saturation events and begin generating reliable output data almost immediately.

Patent pending: United States and Worldwide.

Method for Dynamic Compensation of Bioelectric Electrode
Impedances <back to top>

Abstract: The present system and method are used to automatically improve EEG (or other bio-signal) signal quality and noise rejection with high and/or unbalanced electrode impedances. This method is particularly useful for self-applied electrodes and/or large electrode arrays. This method eliminates most manual re-preparation of the electrode-skin interface. This method can further improve the accuracy and robustness of algorithms using bio-signal data.

Patent pending: United States and Worldwide.

System and Method for High-Speed Determination
of Bioelectric Electrode Impedances <back to top>

Abstract: The present system and method are used to determine electrical impedance of surface electrodes on living organisms.  An embodiment of the system can determine the individual electrode impedances of a 3 electrode array in approximately 0.3 seconds.  The system can be extended to any number of electrodes, whether using a fully differential or a referential electrode montage. Click HERE for more details.

Patent pending: United States and Worldwide.

Automated insomnia treatment system <back to top>

Abstract: Automated behavioral methods and systems for treating insomnia that use passive means for determining wake/sleep states.

Patent pending: United States and Worldwide.

	Published Patent 2004-0225179 [pdf]

Alertness and drowsiness detection and tracking system <back to top>

Abstract: A drowsiness detection system constructed according to the invention provides improved performance by preserving and analyzing newly discovered information contained in rhythmic signal components above 30 Hz which the prior art has universally ignored or discarded as "noise." In the first and second embodiments of the invention, one or more analog EEG signals are collected from a subject, appropriately filtered, converted into digital form, and subjected to frequency analysis. Selected signal components from the frequencies above 30 Hz (such as the frequency range 80-420 Hz), which have a high correlation with subject drowsiness, are isolated, and their amplitude, energy, or power contribution to the EEG signal is used to produce a continuous output measure reflecting the subject's alertness or drowsiness. The output measure may be compared with a threshold to provide an indication of whether the subject is excessively drowsy. In a third embodiment, the analog EEG signal is supplied to a plurality of analog signal processing channels corresponding to respective predefined frequency ranges. Selected signal components in frequencies above 30 Hz are isolated (in a manner analogous to that of the first and second embodiments), and their amplitude, energy, or power contribution to the EEG signal is used to produce a continuous output measure reflecting the subject's alertness or drowsiness.

Patent protected: United States, Canada, France, Germany, Belgium, Denmark, the Netherlands, Switzerland and the United Kingdom.

Patent pending: Japan.

Click Here to contact CRI about Patent and Intellectual Property licensing opportunities.