US3994286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for the processing of physiological measuring signals
Assignee: Siemens AG
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Filing: 1975-06-19
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Granted: 1976-11-30
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Expires: 1995-06-19
Abstract
Abstract A circuit arrangement for the processing of physiological measuring signals, in which there is provided a plurality of input amplifiers each having a positive and a negative input, whose output signals control a signal reproducing arrangement, and which are each connected to a collector electrode. Connected to the positive inputs of the input amplifier are the collector electrodes for the signals, and that resistors are located between the negative inputs and the outputs of the input amplifiers, the negative inputs being connected across the resistors with a common potential junction, and that the two inputs of a differential amplifier are connected to the outputs of respectively two input amplifiers, the output signal of the differential amplifier controlling the signal reproducing arrangement.
Inventors
- 👤 Clas Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:24
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/14; A; A61; A61B; A61B5/00; A61B5/24; A61B5/30; A61B5/307; A61B5/308; H; H03; H03F; H03F3/00; H03F3/68
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
200 words
In a circuit arrangement for the processing of physiological measuring signals, including a plurality of input amplifiers each having respectively a positive input and a negative input; a signal reproducing installation controlled by the output signals of said input amplifiers; and a take-off electrode connected to each said input amplifier, the improvement comprising: said take-off electrodes for said signals being connected to the positive inputs of said input amplifiers; first resistors being connected between said negative inputs and the outputs of said input amplifiers; second resistors being connected between said negative inputs and a common potential junction for the latter; differential amplifier means having two inputs connected to the outputs of at least two of said input amplifiers, said differential amplifier means having an output connected to said reproducing installation and providing an output signal for controlling said signal reproducing installation; said differential amplifier means comprising a plurality of differential amplifiers connected in series; and a program selector positioned between the outputs of said input amplifiers and the inputs of a plurality of said differential amplifiers for connecting pre-programmed output pairs of the input amplifiers to each of said differential amplifiers, said common potential junction being free of ground potential.
Claim 2
Dependent Claim
200 words
In a circuit arrangement for the processing of physiological measuring signals, including a plurality of input amplifiers each having respectively a positive input and a negative input; a signal reproducing installation controlled by the output signals of said input amplifiers; and a take-off electrode connected to each said input amplifier, the improvement comprising: said take-off electrodes for said signals being connected to the positive inputs of said input amplifiers; first resistors being connected between said negative inputs and the outputs of said input amplifiers; second resistors being connected between said negative inputs and a common potential junction for the latter; differential amplifier means having two inputs connected to the outputs of at least two of said input amplifiers, said differential amplifier means having an output connected to said reproducing installation and providing an output signal for controlling said signal reproducing installation; said differential amplifier means comprising a plurality of differential amplifiers connected in series; and a program selector positioned between the outputs of said input amplifiers and the inputs of a plurality of said differential amplifiers for connecting pre-programmed output pairs of the input amplifiers to each of said differential amplifiers, said common potential junction being free of ground potential.
Claim 3
Dependent Claim
26 words
A circuit arrangement as claimed in claim 1, said take-off electrodes being connected to the positive inputs of said input amplifiers for application in an electrocardiograph.
Claim 4
Dependent Claim
45 words
A circuit arrangement as claimed in claim 1, said first resistors between the negative inputs and the outputs of said input amplifiers being equally large, and the second resistors between the negative inputs of said input amplifiers and said common potential junction being equally large.
Claim 5
Dependent Claim
14 words
A circuit arrangement as claimed in claim 1, said input amplifiers comprising operational amplifiers.
References Cited (Backward Citations)
US3811428A
Cited
US3868948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |