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4557270 |
Electroencephalographic system for intra-operative open-heart surgery
During open-heart surgery an EEG (electroencephalograph) system detects a patient's brain waves, amplifies the brain wave signals and converts them into digital data. The cardiopulmonary bypass...
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4550736 |
Movement artifact detector for sleep analysis
The movement detector monitors the electroencephalogram (EEG) signal in order to detect components having a real-time frequency greater than 30 Hz and an amplitude greater than 18 μV; a real-time...
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4545388 |
Self-normed brain state monitoring
Disclosed are a method and an apparatus for monitoring the brain state of a patient during a medical procedure relative to a self-norm established at an earlier time, when the patient is in a state...
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4533346 |
System for automatic feedback-controlled administration of drugs
A system for automatic feedback controlled administration of drugs (SAFCAD) is disclosed for the control of administration of drugs responsive to real-time processed physiological or...
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4495950 |
QREEG Process matrix synchronizer system
A QREEG matrix synchronizer system under the aegis of a "master" QREEG tracing has electrodes and sensors for obtaining new computational diagnostic relationships between EEG, EKG, and other...
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4493327 |
Automatic evoked potential detection
Disclosed are a method and a system for determining if a patient's brain electrical activity reflects a significant evoked response to a sensory stimulus. A test measure of the difference between...
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4493539 |
Method and apparatus for objective determination of visual contrast sensitivity functions
A method and apparatus for objectively determining the visual contrast sensitivity function of a human subject involves subjecting the vision of the human subject to a plurality of sine wave...
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4478223 |
Three dimensional electrocardiograph
This invention relates to a system for the clinical measurement of the electrical potential of a biological system using non-invasive monitoring equipment.
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4462411 |
Evoked response audiometer
An evoked response audiometer is disclosed in which the patient is presented with a continuous auditory signal which is amplitude modulated and the evoked brain potentials of the patient (EEG) are...
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4424816 |
Neurological monitoring device test circuitry
Circuitry for use with a brain wave monitoring device is provided for selectively monitoring the impedance of the current paths in the patient's scalp concurrently with brain wave monitoring, and...
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4421121 |
Method and apparatus for obtaining a non-cephalic referential electroencephalogram
A method and apparatus to provide an electroencephalogram (EEG) measured with respect to a reference which is not on the head and to eliminate the electrocardiographic (EKG) artifact which normally...
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4417590 |
Electroencephalograph
A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode...
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4417592 |
Digital electroencephalographic instrument and method
An electroencephalographic (EEG) system includes an electroencephalographic instrument comprising a plurality of electrodes adapted to be removably connected to the patient's head to detect brain...
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4416288 |
Apparatus and method for reconstructing subsurface electrophysiological patterns
Signals representative of electric potentials generated by cells of a given depth in the cerebral cortex or in other organs of a living body are detected at the surface thereof by an array of...
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4412547 |
Neurological monitoring device
A brain wave monitoring device for monitoring brain wave activity measures the frequency and amplitude of brain wave signals from the left and right hemispheres of the brain. The brain wave signals...
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4411273 |
System and method for electrode pair derivations in electroencephalography
In an electroencephalography system and method, 19 brain wave detection electrodes are removably attached to the scalp of the subject being tested. Using a common reference, such as linked...
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4409987 |
Electroencephalograph
A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode...
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4407299 |
Brain electrical activity mapping
Information on brain electrical activity is derived from electrical-activity transducers spaced apart over the skull, the information is processed into a time sequence of matrices having elements...
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4369496 |
Apparatus for high-speed transcription of recorded physiological data
A device for high-speed transcription of physiological data recorded at substantially lower speeds includes a device for converting the recorded data into electrical signals, a device for...
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4350164 |
Portable, life monitor, medical instrument
A self-powered life monitor in a pocket-size, portable container including a casing with electrode probes mounted on the casing which are capable of piercing the skin to rest in subcutaneous...
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4328491 |
Dynamic data display system, as for use with EEG
A dynamic display system for discrete events of complex data carried by discrete electrical signals which indicate values in three coordinates as triads. One of the values may be an independent...
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4323079 |
Aperiodic analysis system, as for the electroencephalogram
An aperiodic signal is preliminarily processed by an active network to provide three relatively separate components that include: slow waves (waveform cycles or fragments of equivalent frequency...
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4308873 |
Electroencephalograph monitoring
Apparatus for monitoring those signals in the brain which give rise to electroencephalograms (EEG) is described. The apparatus is particularly applicable to the fetus where EEG signals often...
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4279258 |
Rapid automatic electroencephalographic evaluation
The rapid automatic examination and evaluation of large numbers of subjects by electroencephalography is accomplished by removably securing electrodes to the head of each subject under test to...
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4275744 |
Auditory response detection method and apparatus
Auditory tone burst signals are supplied to the ear of a human subject and the electroencephalographic responses are monitored, filtered, and provided to a sampler which samples the polarity of the...
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4275743 |
Measuring device for measuring the bioelectrical activity of the central nervous system
In an exemplary embodiment, a plurality of electrodes to be applied to the patient are employed and potential differences between the electrodes and a reference potential derived from the electrode...
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4254779 |
Brain wave analysis apparatus for use in diagnosing living body conditions
In a brain-wave analysis apparatus, an electrical brain-wave signal is analyzed for purposes of diagnosis by detecting the time interval between adjacent ones of the intersections of the brain-wave...
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RE30502 |
Open lead testing system for EEG
A system for continuous monitoring for open circuits in multiple lead EEG systems during patient testing. Means are provided for repetitively applying a low current signal, having a distinctive...
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4245645 |
Self-locking cerebral electrical probe
A self-locking encephalic electrical probe is used for stereoelectroencephalographic exploration in the treatment of epilepsy or other brain diseases. The probe includes a long, hollow, flexible...
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4244376 |
Measurement of evoked nervous system potentials
Steady-state evoked potentials from the nervous system, measured on the scalp and elsewhere on the body in response to specific periodic sensory stimuli, contain the fundamental frequency of the...
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4236511 |
Electroencephalograph
A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode...
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4230125 |
Method and apparatus for effecting the prospective forewarning diagnosis of sudden brain death and heart death and other brain-heart-body growth maladies such as schizophrenia and cancer and the like
A method and apparatus for effecting the prospective forewarning diagnosis of sudden brain or heart death or other brain-heart and growth malady in a person comprises measuring the T-3 factor of...
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4228806 |
Sleep state inhibited wake-up alarm
A wake-up alarm is set to ring in some time interval. One or more physical characteristics of the sleeping subject, including brain wave activity, pulse rate, REM activity, muscle tension, body...
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4219028 |
Automatic verifying electroencephalograph system
An improved electroencephalograph system is disclosed having a system for automatically verifying the input and output parameters of the various channels, the preset number selected, and a patient...
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4216781 |
Methods of electrophysiological testing
In electrophysiology, methods of testing a subject's neural mechanisms of learning and memory in order to quantitatively diagnose the subject's brain dysfunction require specified conditions or...
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4214591 |
Brain wave analyzing system and method
A memory unit stores, as decision-criterion data for a brain wave to be examined, a mean vector A, a variance vector C and at least one critical value F α at an appropriate significant level α...
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4213465 |
Electroencephalograph
A number of measuring electrodes for emplacement on the head of a patient, signal amplifiers whose input channels are connectable, via a selector, to the measuring electrodes according to a pattern...
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4201224 |
Electroencephalographic method and system for the quantitative description of patient brain states
A method and system for the quantitative description of human abnormal brain states, for example, to distinguish cerebral death from a barbiturate induced deep coma, includes an...
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4188956 |
Method for the analysis, display and classification of multivariate indices of brain function--a functional electrophysiological brain scan
A method in electroencephalography (EEG) for the display of neurometric test data in which electrical activity generated by the brain either spontaneously or in response to specified challenges or...
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4171696 |
Prevention of distortion of brainwave data due to eye movement or other artifacts
Eye and head movements produce large voltages which obscure the electrical activity of the brain, interfering with diagnostic procedures. In the system and method of the present invention...
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4094307 |
Method and apparatus for aiding in the anatomical localization of dysfunction in a brain
A method and apparatus for synthesizing a set of optimal sensory stimuli designed to elicit an optimal response for each particular brain electrode location in a subject whose brain is being...
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4092981 |
Method and apparatus for brain waveform examination
A neural efficiency rating is arrived at by amplifying and band-limiting an EEG waveform of a subject, discarding those parts of the waveform during which alpha rhythm is present, and measuring the...
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4084583 |
Method and apparatus for measuring the bioelectrical activity under an electrode resting on a patient
Method and apparatus for measuring the bioelectrical activity of a patient, wherein a signal electrode is placed on a patient and a plurality of auxiliary electrodes are placed adjacent the signal...
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4083365 |
Dual integrator EEG analyzer
An electroencephalograph (EEG) is connected to record the brain wave response of a subject to periodic stimuli. An EEG analyzer comprising a dual integrator circuit separately records positive and...
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4037586 |
Electroencephalograph display
An electroencephalograph (EEG) instrument or system including a visual display panel actuated in response to digital signals for indicating the particular pattern in which the electrodes connected...
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3958563 |
Two speed system for EEG recording
A method and system for recording EEG waveforms whereby the amplitude of the waveform signal in both positive and negative direction is compared with variable levels and a trigger signal produced...
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3951134 |
Apparatus and method for remotely monitoring and altering brain waves
Apparatus for and method of sensing brain waves at a position remote from a subject whereby electromagnetic signals of different frequencies are simultaneously transmitted to the brain of the...
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3910258 |
Cerebral activity monitor
A brain wave signal monitor with a warning device actuated by failure of the signals to be present at a preselected minimal level for a specific period of time. The warning device is actuated by a...
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3901215 |
Method of testing the senses and cognition of subjects
A patient who may be unable to cooperate is tested for auditory, visual and somatosensory perception and for various cognitive processes. The testing method involves selecting the conditions to be...
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3893450 |
Method and apparatus for brain waveform examination
A method and apparatus for examining the brain waveform of a subject, for example in a type of electro-encephalography (EEG), by providing a stimuli, such as a light, and determining a...
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