US3598110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventricular arrhythmia detection system
Assignee: PHYSIC CONTROL CORP
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Filing: 1969-04-10
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Granted: 1971-08-10
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Expires: 1989-04-10
Abstract
Abstract A system is disclosed for detecting the occurrence of a premature ventricular contraction in a patient or in the signals provided by a training apparatus which generates signals representing a premature ventricular contraction (PVC). The electrocardiograph signals from the patient or a training apparatus are applied via differentiating circuit and filter circuit to a logic system which operates to analyze the QRS signals to determine whether or not the QRS signal is a normal signal or whether it is the result of a PVC. Pulse generating circuits are used to define timing arrangements so that if the signal is the result of or represents a PVC then an alarm circuit is activated. Details of the logic circuitry and of a system wherein horizontal markers are provided on the cathode-ray tube display of the QRS signal to facilitate utilization of the equipment by a person unskilled in the electronic arts are provided.
Inventors
- 👤 Karl W Edmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:08
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/363
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A system for monitoring electrocardiograph signals comprising in combination: signal input means for receiving electrocardiograph input signals which include QRS signals; a first signal-generating means connected to said signal input means and providing a first signal defining a fixed time interval in response to the Q-R portion of an input signal exceeding a predetermined magnitude; second signal-generating means connected to said signal input means and providing an information signal in response to any input electrocardiograph signal changing in the R-S direction and achieving a selected amplitude; information signal-monitoring means; signal-gating means connected to said first signal-generating means for control thereby and between said monitoring means and said second signal-generating means, said signal-gating means preventing the application of an output signal to said monitoring means from said second signalgenerating means during said time interval; and a third signalgenerating circuit connected between said second signalgenerating circuit and said signal input means and providing a control signal to said second signal-generating circuit operative to hold said second signal-generating circuit against recycling for a predetermined time following generation of a said information signal.
Claim 2
Independent Claim
179 words
A system for monitoring electrocardiograph signals comprising in combination: signal input means for receiving electrocardiograph input signals which include QRS signals; a first signal-generating means connected to said signal input means and providing a first signal defining a fixed time interval in response to the Q-R portion of an input signal exceeding a predetermined magnitude; second signal-generating means connected to said signal input means and providing an information signal in response to any input electrocardiograph signal changing in the R-S direction and achieving a selected amplitude; information signal-monitoring means; signal-gating means connected to said first signal-generating means for control thereby and between said monitoring means and said second signal-generating means, said signal-gating means preventing the application of an output signal to said monitoring means from said second signalgenerating means during said time interval; and a third signalgenerating circuit connected between said second signalgenerating circuit and said signal input means and providing a control signal to said second signal-generating circuit operative to hold said second signal-generating circuit against recycling for a predetermined time following generation of a said information signal.
Claim 3
Dependent Claim
217 words
A ventricular arrhythmia detection system comprising in combination: a signal input circuit means; a first signal-generating circuit coupled with said input circuit means and responsive to the leading edge of a normal QRS electrocardiograph signal reaching a first amplitude to provide a first signal which terminates during the RS portion of a normal QRS signal; second signal-generating circuit means coupled with said input circuit means and responsive to any input signal changing in the R-S direction of a normal QRS signal reaching a second condition to provide a second signal, said second signal occurring prior to termination of said first signal for a normal QRS signal and subsequent thereto for a QRS signal having a duration longer than normal; signal-gating circuit means connected to each of said signal-generating circuit means and providing an information signal only in response to the occurrence of said second signal during the absence of said first signal; alarm circuit means connected to said signal-gating circuit means and responsive to information signals therefrom; and signal display means including an oscilloscope connected to said input circuit means and having beam deflection control circuits coupled with said first and second signal-generating circuit means to provide horizontal visual markers on the QRS wave of an electrocardiograph signal upon the occurrence of said first and second signals.
Claim 4
Dependent Claim
217 words
A ventricular arrhythmia detection system comprising in combination: a signal input circuit means; a first signal-generating circuit coupled with said input circuit means and responsive to the leading edge of a normal QRS electrocardiograph signal reaching a first amplitude to provide a first signal which terminates during the RS portion of a normal QRS signal; second signal-generating circuit means coupled with said input circuit means and responsive to any input signal changing in the R-S direction of a normal QRS signal reaching a second condition to provide a second signal, said second signal occurring prior to termination of said first signal for a normal QRS signal and subsequent thereto for a QRS signal having a duration longer than normal; signal-gating circuit means connected to each of said signal-generating circuit means and providing an information signal only in response to the occurrence of said second signal during the absence of said first signal; alarm circuit means connected to said signal-gating circuit means and responsive to information signals therefrom; and signal display means including an oscilloscope connected to said input circuit means and having beam deflection control circuits coupled with said first and second signal-generating circuit means to provide horizontal visual markers on the QRS wave of an electrocardiograph signal upon the occurrence of said first and second signals.
Claim 5
Dependent Claim
46 words
The system of claim 2 including a thIrd signal-generating circuit connected between said input circuit means and said second signal-generating circuit means and providing a signal which first triggers said second signal-generating circuit means and then holds the same against further triggering for a predetermined time.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |