1995-01-23
1997-10-21
Jastrzab, Jeffrey R.
Surgery
Truss
Pad
128901, 128902, A61B 50476
Patent
active
056785593
ABSTRACT:
Electrodes, preferably paired on a patient's head, produce signals representing the patient's brain waves at one of the paired electrodes and reference signals at the other paired electrode. Pre-amplifiers juxtaposed to the paired electrodes and having a balanced operation even with impedance differences between the paired electrodes produce signals representing the difference in the signals between such electrodes. After filtering to eliminate DC and band limit the upper frequency, the signals from each pre-amplifier pass to a post-amplifier displaced and electrically isolated from the pre-amplifier. The post-amplifier linearly amplifies the pre-amplifier signals and filters the signals at the lower and upper frequencies within a particular frequency range dependent upon the frequency range in which the investigator is interested. The upper and lower limits of the frequency range are dependent upon the frequencies of controlling clock signals. The upper and lower clock frequencies may be varied progressively to determine the characteristics of the signals produced at the individual ones of the electrodes from brain wave shapes at such electrodes. The cut-off characteristics of the pre-amplifier at the upper and lower frequency limits may be varied by adjusting impedance values in the filter. An electroocular system constructed similarly to, and operative in timed relationship with, the electrode encephalographic system indicates whether signals at the electroencephalographic electrodes result from the patient's eye movements. An electrocardiographic system constructed similarly to, and operative in timed relationship with, the electroencephalographic system indicates the relationship between the patient's brain and heart waveforms.
REFERENCES:
patent: 4201224 (1980-05-01), John
patent: 4204546 (1980-05-01), Smith et al.
patent: 4928704 (1990-05-01), Hardt
patent: 5038782 (1991-08-01), Gevins et al.
patent: 5273037 (1993-12-01), Itil et al.
patent: 5368041 (1994-11-01), Shambroom
Jastrzab Jeffrey R.
Roston Ellsworth R.
LandOfFree
Eeg system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Eeg system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eeg system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-999209