US3958563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two speed system for EEG recording
Assignee: Individual
•
Filing: 1974-11-06
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Granted: 1976-05-25
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Expires: 1994-11-06
Abstract
Abstract 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 when the amplitude exceeds a level to cause the strip of recording paper to speed up for at least a predetermined time and to continue for the length of the seizure so that little paper is accumulated during periods of uninteresting activity while a complete readable record is produced of any notable EEG activity, such as an epileptic seizure.
Inventors
- 👤 Heriberto Fernandez
- 👤 George T. Pardue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; A61B5/307; A61B5/31; A61B5/316; A61B5/369; A61B5/384; A61B5/40; A61B5/4076; A61B5/4094; G; G01; G01D; G01D9/00; G01D9/02; G01D9/10; G01D9/12; G01D9/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
127 words
A system for recording EEG electrical body waveforms comprising: means for detecting an EEG waveform and producing an electrical signal representing said waveform, means for comparing the amplitude of said electrical signal with a predetermined amplitude level and producing a trigger signal when said amplitude of said electrical signal exceeds said predetermined level, means responsive to said electrical signal for producing a graphical representation of said waveform on a strip of recording material, means for driving said strip of recording material past said representation producing means, and means for causing said driving means to change the speed at which said recording material is driven from a first speed to a second speed higher than said first speed when said comparing and producing means produces said trigger signal.
Claim 2
Independent Claim
127 words
A system for recording EEG electrical body waveforms comprising: means for detecting an EEG waveform and producing an electrical signal representing said waveform, means for comparing the amplitude of said electrical signal with a predetermined amplitude level and producing a trigger signal when said amplitude of said electrical signal exceeds said predetermined level, means responsive to said electrical signal for producing a graphical representation of said waveform on a strip of recording material, means for driving said strip of recording material past said representation producing means, and means for causing said driving means to change the speed at which said recording material is driven from a first speed to a second speed higher than said first speed when said comparing and producing means produces said trigger signal.
Claim 3
Dependent Claim
14 words
A system as in claim 1 wherein said representation producing means is a polygraph.
Claim 4
Dependent Claim
25 words
A system as in claim 1 wherein said causing means includes means for maintaining said second speed for a predetermined time following said trigger signal.
Claim 5
Dependent Claim
87 words
A system as in claim 1 wherein said causing means includes a one-shot flip-flop means connected to said comparing means for shifting from a first to second electrical condition at an output upon receipt of said trigger signal for a predetermined time and relay means connected to said flip-flop means for applying a first voltage signal to said driving means when said flip-flop means is in said first condition and a second voltage signal to said driving means when said flip-flop means is in said second condition.
Claim 6
Dependent Claim
14 words
A system as in claim 4 further including means for varying said predetermined time.
Claim 7
Dependent Claim
14 words
A system as in claim 5 wherein said predetermined time is roughly 4 seconds.
Claim 8
Dependent Claim
40 words
A system as in claim 4 further including indicator means connected to said flip-flop means output for indicating when said flip-flop means is in said second condition and accordingly said driving means is driving said strip at said second speed.
Claim 9
Dependent Claim
50 words
A system as in claim 1 wherein said comparing and producing means includes means for establishing said amplitude level and an operational amplifier with one input connected to said detecting means for receiving said electrical signal and the othe input connected to said establishing means for receiving said amplitude level.
Claim 10
Dependent Claim
37 words
A system as in claim 8 wherein said establishing means includes a variable resistor connected to said other input and a voltage source connected to said variable resistor for applying a D.C. voltage to said other input.
Claim 11
Dependent Claim
73 words
A system as in claim 9 wherein said comparing means and producing means includes means for establishing a second amplitude level having a polarity opposite the first amplitude level and a second operational amplifier with one input connected to said detecting means for receiving said electrical signal and the other input connected to said second amplitude level establishing means for receiving said second amplitude level having a polarity opposite the first amplitude level.
Claim 12
Dependent Claim
63 words
A system as in claim 10 wherein said second amplitude level establishing means includes a second voltage source, and second variable resistor connected to said other input of said second amplifier and to said second voltage source, said second voltage source having a polarity opposite that of the voltage source connected to the first variable resistor, for applying a second D.C. voltage thereto.
Claim 13
Dependent Claim
49 words
A system as in claim 11 further including first switch means for connecting and disconnecting said first variable resistor from said other input of said first operational amplifier and second switch means for connecting and disconnecting said second variable resistor from said other input of said second operational amplifier.
Claim 14
Dependent Claim
34 words
A system as in claim 1 further including means for amplifying said electrical signal from the detecting means, and a high pass filter connected between said amplifying means and said comparing and producing means.
Claim 15
Dependent Claim
20 words
A system as in claim 1 wherein said strip is paper and said driving means includes a variable speed motor.
Claim 16
Independent Claim
119 words
A system for recording EEG electrical body waveforms comprising: means for detecting an EEG signal and producing an electrical waveform signal, means connected to said detecting and producing means for producing a trigger signal when the amplitude of said waveform signal in at least one polarity exceeds a predetermined level with respect to a given reference, means responsive to said waveform signal for producing a graphical representation of said waveform on a strip of recording material, means for driving said strip past said representation producing means, and means for changing the speed at driving said strip for a predetermined time from a first speed to a second speed higher than said first speed upon production of said trigger signal.
Claim 17
Independent Claim
119 words
A system for recording EEG electrical body waveforms comprising: means for detecting an EEG signal and producing an electrical waveform signal, means connected to said detecting and producing means for producing a trigger signal when the amplitude of said waveform signal in at least one polarity exceeds a predetermined level with respect to a given reference, means responsive to said waveform signal for producing a graphical representation of said waveform on a strip of recording material, means for driving said strip past said representation producing means, and means for changing the speed at driving said strip for a predetermined time from a first speed to a second speed higher than said first speed upon production of said trigger signal.
Claim 18
Dependent Claim
67 words
A system as in claim 15 wherein said trigger signal means includes means for establishing a positive predetermined level and a negative predetermined level above and below, respectively, a reference level, and means for comparing the amplitude of said waveform signal with said positive and negative levels and producing said trigger signal when said amplitude of said waveform signal exceeds one of said positive and negative levels.
References Cited (Backward Citations)
GB911078A
Cited
US3513834A
Cited
GB1202869A
Cited
US3646930A
Cited
US3650263A
Cited
DE1962077A1
Cited
US3854472A
Cited
US3721230A
Cited
US3841309A
Cited
US3824990A
Cited
US3841315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |