US3868948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple channel electrocardiograph
Assignee: Parke Davis and Co LLC
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Filing: 1974-03-04
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Granted: 1975-03-04
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Expires: 1994-03-04
Abstract
Abstract The specific disclosure provides a multiple channel electrocardiograph wherein three body voltage measurements are simultaneously read-out on a moving chart. The electrocardiograph comprises means for automatically changing the body voltage measurements that are recorded on the chart, and means including a selectively operable circuit for automatically attentuating chest voltage measurements taken in vicinity of the heart.
Inventors
- 👤 Ernest F J Graetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; A61B5/307; A61B5/308
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
In an electrocardiograph comprising a plurality of parallel signal processing channels, each one of said channels including means for amplifying signals, means for simultaneously applying a plurality of signals representative of different body electrical potentials including electrical potentials in the vicinity of the heart to said channels, and means for simultaneously recording signals processed by said channels, the combination comprising: means for automatically changing said applying means to sequentially apply different pluralities of body electrical potential signals to said channels, at least one of said different pluralities of body electrical potential signals being chest signals representative of electrical potentials in the vicinity of the heart, and means in each one of said channels responsive to said changing means for reducing the amplitudes of the chest signals.
Claim 2
Dependent Claim
126 words
In an electrocardiograph comprising a plurality of parallel signal processing channels, each one of said channels including means for amplifying signals, means for simultaneously applying a plurality of signals representative of different body electrical potentials including electrical potentials in the vicinity of the heart to said channels, and means for simultaneously recording signals processed by said channels, the combination comprising: means for automatically changing said applying means to sequentially apply different pluralities of body electrical potential signals to said channels, at least one of said different pluralities of body electrical potential signals being chest signals representative of electrical potentials in the vicinity of the heart, and means in each one of said channels responsive to said changing means for reducing the amplitudes of the chest signals.
Claim 3
Dependent Claim
37 words
The electrocardiograph of claim 1 wherein said changing means comprises a plurality of switch networks corresponding in number to said different pluralities of body electrical potential signals, and a shift register for sequentially actuating said switch networks.
Claim 4
Dependent Claim
42 words
The electrocardiograph of claim 2 wherein said changing means further comprises a logic circuit connected to said shift register for applying a signal to said reducing means when one of the switch networks is actuated to pass chest signals to said channels.
Claim 5
Dependent Claim
59 words
The electrocardiograph of claim 1 wherein said changing means comprises a plurality of switch networks correspOnding in number to said different pluralities of body electrical potential signals, means for sequentially actuating the switch networks, and means responsive to said actuating means for generating an initiation signal to said reducing means when said chest signals are applied to said channels.
Claim 6
Dependent Claim
38 words
The electrocardiograph of claim 4 wherein said reducing means comprises an amplifier circuit having an adjustable gain in each one of the channels, said amplifier circuits each including means responsive to said initiation signal for lowering the gain.
Claim 7
Dependent Claim
61 words
The electrocardiograph of claim 5 wherein each one of said amplifier circuits includes an amplifier feedback circuit comprising a plurality of serially connected resistors, and a plurality of manually operable switches for connecting points between successive ones of the resistors and a feedback amplifier input, whereby operation of one of the manually operable switches adjusts the gain to a predetermined level.
Claim 8
Dependent Claim
40 words
The electrocardiograph of claim 6 wherein said reducing means further comprises resistor means placed in circuit in response to said initiation signal for adjusting the signal at the feedback input in a direction to reduce the amplitude of chest signals.
Claim 9
Dependent Claim
28 words
The electrocardiograph of claim 7 wherein said initiation signal places said resistor means in parallel with at least the first resistor in said plurality of serially connected resistors.
Claim 10
Dependent Claim
18 words
The electrocardiograph of claim 4 further comprising a manually operable switch for enabling said initiation signal generating means.
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |