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Patent US3874370A successfully refreshed from Google Patents.
US3874370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocardiographic waveform analyzer
Assignee: American Optical Corp
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Filing: 1974-04-15
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Granted: 1975-04-01
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Expires: 1994-04-15
Abstract
Abstract There is disclosed a system for reviewing ECG signals at high speed. Successive ECG waveforms are superimposed on each other in a display, but the rate at which traces of the waveforms are formed is independent of the rate at which ECG waveforms are played back from a tape on which they are recorded. This is achieved by storing data representative of each ECG waveform in a recirculating memory whose recirculation rate is faster than the input data rate, and using the recirculated data to form the display. A similar recirculating memory is provided to form a display of each 4-second ECG signal segment which contains a premature beat, this display being formed automatically without requiring operator control.
Inventors
- 👤 George J Harris
- 👤 Thomas K Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:17
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/333; A61B5/336; A61B5/337; G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
269 words
A system for reviewing an ECG signal stored on a recording medium comprising means for reading the ECG signal from said recording medium at a rate substantially faster than the rate at which said ECG signal was recorded, first means for temporarily storing successive ECG waveforms read from said recording medium, first recirculating memory means, means responsive to the storage of an ECG waveform in said first temporary storage means for transferring the stored ECG waveform to said first recirculating memory means, second means for temporarily storing a segment of the ECG signal read from said recording medium which is at least long enough to include 2 normal heartbeat cycles, second recirculating memory means, means for detecting an abnormal heartbeat in the ECG signal read from said recording medium and responsive thereto for transferring the temporarily stored ECG signal segment to said second recirculating memory means, means for recirculating an ECG waveform stored in said first recirculating memory means and an ECG signal segment stored in said second recirculating memory means at rates faster than the rates at which an ECG waveform and an ECG signal segment are stored in said first and second temporary storage means, and display means synchronized to the recirculation rates of said first and second recirculating memory means for displaying all ECG waveforms stored in said first recirculating memory means superimposed on each other, whereby ECG waveform traces are formed on said display means at a rate faster than that at which they are read from said recording medium, and for displaying separately the ECG signal segment stored in said second recirculating memory means.
Claim 2
Independent Claim
269 words
A system for reviewing an ECG signal stored on a recording medium comprising means for reading the ECG signal from said recording medium at a rate substantially faster than the rate at which said ECG signal was recorded, first means for temporarily storing successive ECG waveforms read from said recording medium, first recirculating memory means, means responsive to the storage of an ECG waveform in said first temporary storage means for transferring the stored ECG waveform to said first recirculating memory means, second means for temporarily storing a segment of the ECG signal read from said recording medium which is at least long enough to include 2 normal heartbeat cycles, second recirculating memory means, means for detecting an abnormal heartbeat in the ECG signal read from said recording medium and responsive thereto for transferring the temporarily stored ECG signal segment to said second recirculating memory means, means for recirculating an ECG waveform stored in said first recirculating memory means and an ECG signal segment stored in said second recirculating memory means at rates faster than the rates at which an ECG waveform and an ECG signal segment are stored in said first and second temporary storage means, and display means synchronized to the recirculation rates of said first and second recirculating memory means for displaying all ECG waveforms stored in said first recirculating memory means superimposed on each other, whereby ECG waveform traces are formed on said display means at a rate faster than that at which they are read from said recording medium, and for displaying separately the ECG signal segment stored in said second recirculating memory means.
Claim 3
Dependent Claim
38 words
A system in accordance with claim 1 wherein ECG waveforms and ECG signal segments are stored in said first and second temporary storage means and in said first and second recirculating memory means in the form of samples.
Claim 4
Dependent Claim
50 words
A system in accordance with claim 2 wherein the ECG waveform stored in said first temporary storage means is transferred to said first recirculating memory means at a rate so fast that during the transfer time there is an insignificant change in the ECG signal read from said recording medium.
Claim 5
Dependent Claim
51 words
A system in accordance with claim 2 wherein the ECG signal segment stored in said second temporary storage means is transferred to said second recirculating memory means at a rate so fast that during the transfer time there is an insignificant change in the ECG signal read from said recording medium.
Claim 6
Dependent Claim
96 words
A system in accordance with claim 2 wherein said display means includes a CRT, means for converting the samples recirculated in said first and second recirculating memory means, during respective recirculation cycles thereof, to derive a vertical deflection signal for said CRT, means for synchronizing the horizontal sweeps of said CRT to the recirculation rates of said first and second recirculating memory means during respective recirculation cycles thereof, and means for changing the bias of said vertical deflection signal for respective ones of said recirculation cycles so that two separate displays are formed on said CRT.
Claim 7
Dependent Claim
17 words
A system in accordance with claim 2 wherein said abnormal heartbeat detecting means is a prematurity detector.
Claim 8
Dependent Claim
50 words
A system in accordance with claim 1 wherein the ECG waveform stored in said first temporary storage means is transferred to said first recirculating memory means at a rate so fast that during the transfer time there is an insignificant change in the ECG signal read from said recording medium.
Claim 9
Dependent Claim
51 words
A system in accordance with claim 1 wherein the ECG signal segment stored in said second temporary storage means is transferred to said second recirculating memory means at a rate so fast that during the transfer time there is an insignificant change in the ECG signal read from said recording medium.
Claim 10
Dependent Claim
17 words
A system in accordance with claim 1 wherein said abnormal heartbeat detecting means is a prematurity detector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |