Surgery – Truss – Pad
Patent
1992-07-31
1993-07-27
Howell, Kyle L.
Surgery
Truss
Pad
128746, A61B 504
Patent
active
052303446
ABSTRACT:
The evoked potential processing system includes, in one embodiment, a spectral averaging method. Time based, digital pre-stimulus and post-stimulus electroencephalographic (EEG) signal streams are obtained and are converted into frequency spectrum signals. A differential spectrum is obtained. The differential spectrums from a plurality of sweeps are summed. The summed differential spectrum is then converted into a time based signal stream which contains the evoked potential (EP) signal therein. The EP signal can also be obtained utilizing a two-dimensional filter. Pre- and post-stimulus EEG signal streams for a sub-group of stimuli, wherein each stimulus in a group has the same intensity or frequency, are filtered by conventional averaging or spectral differential averaging. The time based, filtered, post-stimulus EEG signal streams are placed in an array and the array is then filtered by a two-dimensional Fast Fourier Transform (FFT) filter. The array is then filtered by a mask and the masked array is then transformed into a time based format by an inverse FFT. The adaptive averaging technique utilizes a computational formula which computes an estimated running signal to noise ratio. When the difference between the pre-stimulus running SNR and the post-stimulus running SNR is less than a predetermined threshold, further stimulation and acquisition of EEG signals stops. Hence, the post-acquisition processing of the EEG signals is limited to that number of EEG sweeps. The electrode wire configuration uses a cross wiring scheme wherein the shield of a particular wire is connected to the other electrode wire to eliminate artifacts in the respective electrode wire.
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Delgado Rafael E.
Ozdamar Ozcan
Howell Kyle L.
Intelligent Hearing Systems Corp.
Kain, Jr. Robert C.
Manuel George
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