US4550736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movement artifact detector for sleep analysis
Assignee: University of Ottawa
•
Filing: 1984-10-10
•
Granted: 1985-11-05
•
Expires: 2004-10-10
Abstract
Abstract 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 frequency greater than 30 Hz and an amplitude between ±9 μV; or a real-time frequency less than 1.2 Hz and an amplitude greater than 200 μV. An output signal is provided when at least one of these components is detected.
Inventors
- 👤 Roger Broughton
- 👤 Bernardo da Costa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:11
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/72; A61B5/7203; A61B5/7207; A61B5/24; A61B5/316; A61B5/369; A61B5/372
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A movement detector for a sleep analyser comprising: means for receiving an electroencephalogram (EEG) signal; first monitoring means for detecting only components in the EEG signal having a real-time frequency greater than approximately 30 Hz and greater than a first predetermined amplitude; a second monitoring means for detecting only components in the EEG signal having a real-time frequency greater than approximately 30 Hz and a second predetermined amplitude smaller than the first predetermined amplitude; third monitoring means for detecting only components in the EEG signal having a real-time frequency less than approximately 1.2 Hz and a third predetermined amplitude at least an order in magnitude greater than the first predetermined amplitude; and means connected to the first, second and third monitoring means for providing an output only if at least one of the predetermined components are detected.
Claim 2
Dependent Claim
137 words
A movement detector for a sleep analyser comprising: means for receiving an electroencephalogram (EEG) signal; first monitoring means for detecting only components in the EEG signal having a real-time frequency greater than approximately 30 Hz and greater than a first predetermined amplitude; a second monitoring means for detecting only components in the EEG signal having a real-time frequency greater than approximately 30 Hz and a second predetermined amplitude smaller than the first predetermined amplitude; third monitoring means for detecting only components in the EEG signal having a real-time frequency less than approximately 1.2 Hz and a third predetermined amplitude at least an order in magnitude greater than the first predetermined amplitude; and means connected to the first, second and third monitoring means for providing an output only if at least one of the predetermined components are detected.
Claim 3
Dependent Claim
35 words
A movement detector as claimed in claim 1 wherein the first predetermined amplitude is approximately 18 μV, the second predetermined amplitude is between approximately ±9 μV, and the third predetermined amplitude is approximately 200 μV.
Claim 4
Dependent Claim
59 words
A movement detector as claimed in claim 2 wherein the first monitoring means includes a high-pass filter, a first threshold discriminator connected to the high-pass filter, a first low-pass filter connected to the first discriminator and a second threshold discriminator connected to the first low-pass filter to provide an output when predetermined components are present in the EEG signal.
Claim 5
Dependent Claim
70 words
A movement detector as claimed in claim 3 wherein the second monitoring means includes a positive threshold discriminator and a negative threshold discriminator connected in parallel to the high-pass filter, a second low-pass filter for receiving the combined outputs of the negative and positive threshold discriminators and a threshold detector connected to the second low pass filter to provide an output when predetermined components are present in the EEG signal.
Claim 6
Dependent Claim
15 words
A movement detector as claimed in claim 4 wherein the output means includes an OR-gate.
References Cited (Backward Citations)
US4417592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |