US3709212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multichannel electrocardiograph having one less input amplifiers than the number of signals to be measured
Assignee: Gould Inc
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Filing: 1970-08-05
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Granted: 1973-01-09
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Expires: 1990-08-05
Abstract
Abstract An electrocardiograph is described wherein one less input amplifier than the number of signals to be measured is coupled to circuitry for combining the signals with various scale factors to provide several different signals at different measuring terminals.
Inventors
- 👤 W Koeblitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:23
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; A61B5/307; A61B5/308; Y; Y10; Y10S; Y10S128/00; Y10S128/902
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
An electrocardiograph system comprising at least three electrode means for connection to a patient for measuring a plurality of potential differences of bioelectric origin developed between the said electrode means; signal conductors being at least three in number connected to said at least three electrode means; a plurality of differential input amplifiers, fewer in number than the number of potential differences to be measured, but not less than the number of said conductors minus one; first circuit means connected to said signal conductors and to said amplifiers to apply a different signal to the input of each of said amplifiers, each signal corresponding to a difference in potential between conductors of said plurality of signal conductors; a plurality of sets of measuring terminals, one set for each of said potential differences to be measured; second circuit means connected to the outputs of said amplifiers and to said sets of measuring terminals and adapted to deliver to each of said sets of measuring terminals the output signals from said amplifiers; and means connected to said sets of measuring terminals for measuring said output signals.
Claim 2
Dependent Claim
183 words
An electrocardiograph system comprising at least three electrode means for connection to a patient for measuring a plurality of potential differences of bioelectric origin developed between the said electrode means; signal conductors being at least three in number connected to said at least three electrode means; a plurality of differential input amplifiers, fewer in number than the number of potential differences to be measured, but not less than the number of said conductors minus one; first circuit means connected to said signal conductors and to said amplifiers to apply a different signal to the input of each of said amplifiers, each signal corresponding to a difference in potential between conductors of said plurality of signal conductors; a plurality of sets of measuring terminals, one set for each of said potential differences to be measured; second circuit means connected to the outputs of said amplifiers and to said sets of measuring terminals and adapted to deliver to each of said sets of measuring terminals the output signals from said amplifiers; and means connected to said sets of measuring terminals for measuring said output signals.
Claim 3
Dependent Claim
19 words
Means as described in claim 1 wherein said circuit means connected to said sets of terminals comprise operational amplifiers.
Claim 4
Dependent Claim
51 words
Means as described in claim 1 wherein said signal conductors are three in number, said differential input amplifiers two in number, the input of one amplifier is connected to two of said three conductors, and the input of the other amplifier is connected to a different two of said three conductors.
Claim 5
Dependent Claim
138 words
An electrocardiograph adapted to record simultaneously a plurality of ECG signals developed between three signal electrodes comprising: only two differential input amplifiers fewer in number than the three signals to be measured; first circuit means connected to saiD electrodes and to said amplifiers to apply a different signal to the input of each of said amplifiers, each signal corresponding to a difference in potential between electrodes of said three signal electrodes; a plurality of sets of measuring terminals, one set for each of said ECG signals to be recorded; second circuit means connected to the outputs of said amplifiers and to said sets of measuring terminals and adapted to deliver to each of said sets of measuring terminals the output signals from said amplifiers; and means connected to said sets of measuring terminals for measuring said output signals.
Claim 6
Dependent Claim
138 words
An electrocardiograph adapted to record simultaneously a plurality of ECG signals developed between three signal electrodes comprising: only two differential input amplifiers fewer in number than the three signals to be measured; first circuit means connected to saiD electrodes and to said amplifiers to apply a different signal to the input of each of said amplifiers, each signal corresponding to a difference in potential between electrodes of said three signal electrodes; a plurality of sets of measuring terminals, one set for each of said ECG signals to be recorded; second circuit means connected to the outputs of said amplifiers and to said sets of measuring terminals and adapted to deliver to each of said sets of measuring terminals the output signals from said amplifiers; and means connected to said sets of measuring terminals for measuring said output signals.
Claim 7
Dependent Claim
32 words
An electrocardiograph as described in claim 4 wherein said means for measuring said output signals comprises a multi-channel oscillograph having a different channel connected to each of said sets of measuring terminals.
Claim 8
Dependent Claim
80 words
An electrocardiograph as described in claim 4 in which said signal electrodes are located at the left arm, right arm, and left leg of a subject, and said circuit means connected to said electrodes apply a signal corresponding to the potential difference between two of said electrodes to the input of one of said amplifiers and apply a signal corresponding to the potential difference between a different two of said electrodes to the input of the other of said amplifiers.
Claim 9
Dependent Claim
120 words
An electrocardiograph as described in claim 4 in which said signal electrodes are located at the left arm, right arm, and left leg of a subject, and said first circuit means connected to said electrodes applied to the input of one of said amplifiers a signal corresponding to the difference between the potential of a first one of said electrodes and the average of the potentials at the second and third ones of said electrodes, and applies to the input of the other of said amplifiers a signal corresponding to the difference between the potential of the second or third of said electrodes and the average of the potentials of the first and the third or second of said electrodes.
Claim 10
Dependent Claim
53 words
An electrocardiograph as described in claim 4 wherein at one of said sets of measuring terminals the scale factor for the signal component from one of said amplifiers is zero and at another of said sets of terminals the scale factor for the signal component from the other of said amplifiers is zero.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |