Patent US3886931A successfully refreshed from Google Patents.
US3886931A
Expired / Lapsed
US
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Electrodiagnostic apparatus
Assignee: RODLER ING HANS
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Filing: 1972-12-01
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Granted: 1975-06-03
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Expires: 1992-12-01
Abstract
Abstract An electrodiagnostic apparatus comprises an adjustable constantcurrent generator in the form of an operational amplifier selectively energizable in various modes, i.e. with sawtooth waves, square waves, direct current and manually generated pulses. The magnitude of this current is adjusted with the aid of a potentiometer whose slider is coupled with an indicator which in a preferred embodiment has the form of a rotatable setting disk sweeping over a fixed logarithmic current scale. A coacting disk coaxial with the setting disk has a marker which can be aligned with a marker on the setting disk after the same has been adjusted to a current intensity representing the accommodation threshold of a patient tested in the sawtooth-wave mode; upon a switchover to square-wave mode and readjustment of the setting disk to give a rheobase reading, a window in the coacting disk exposes a reading of the corresponding accommodation quotient on the underlying setting disk. Instead of a single potentiometer, two potentiometers may be used whose sliders are respectively coupled with the setting disk and with the coacting disk, these sliders being alternately connectable to an input of the operational amplifier for energizing same in either the sawtoothwave or the square-wave mode.
Inventors
- 👤 Hans Rodler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:48
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/05; A61N; A61N1/00; A61N1/18; A61N1/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
192 words
An electrodiagnostic apparatus comprising: constant-current-generating means provided with adjusting means for varying the magnitude of the output current thereof; mode-selector means connected to said constant-current-generator means for alternately positioning same in a sawtooth-wave mode and in a square-wave mode; and indicator means including a stationary support carrying a logarithmic scale, a setting member displaceable relatively to said support and provided with first marking means co-operating with said scale to give an accommodation-threshold reading upon a testing of a patient with said output current in said sawtooth-wave mode, and a coacting member displaceable relatively to said support independently of said setting member and provided with second marking means co-operating with said scale to give a rheobase reading upon a testing of a patient with said output current in said square-wave mode, at least one of said members being coupled with said adjusting means for entrainment thereby, said setting member being further provided with numerical indicia and said coacting member being further provided with third marking means co-operating with said indicia for giving an accommodation-quotient reading upon displacement of said members into positions respectively determined by said adjusting means during rheobase and accommodation-threshold measurements.
Claim 2
Dependent Claim
192 words
An electrodiagnostic apparatus comprising: constant-current-generating means provided with adjusting means for varying the magnitude of the output current thereof; mode-selector means connected to said constant-current-generator means for alternately positioning same in a sawtooth-wave mode and in a square-wave mode; and indicator means including a stationary support carrying a logarithmic scale, a setting member displaceable relatively to said support and provided with first marking means co-operating with said scale to give an accommodation-threshold reading upon a testing of a patient with said output current in said sawtooth-wave mode, and a coacting member displaceable relatively to said support independently of said setting member and provided with second marking means co-operating with said scale to give a rheobase reading upon a testing of a patient with said output current in said square-wave mode, at least one of said members being coupled with said adjusting means for entrainment thereby, said setting member being further provided with numerical indicia and said coacting member being further provided with third marking means co-operating with said indicia for giving an accommodation-quotient reading upon displacement of said members into positions respectively determined by said adjusting means during rheobase and accommodation-threshold measurements.
Claim 3
Dependent Claim
192 words
An electrodiagnostic apparatus comprising: constant-current-generating means provided with adjusting means for varying the magnitude of the output current thereof; mode-selector means connected to said constant-current-generator means for alternately positioning same in a sawtooth-wave mode and in a square-wave mode; and indicator means including a stationary support carrying a logarithmic scale, a setting member displaceable relatively to said support and provided with first marking means co-operating with said scale to give an accommodation-threshold reading upon a testing of a patient with said output current in said sawtooth-wave mode, and a coacting member displaceable relatively to said support independently of said setting member and provided with second marking means co-operating with said scale to give a rheobase reading upon a testing of a patient with said output current in said square-wave mode, at least one of said members being coupled with said adjusting means for entrainment thereby, said setting member being further provided with numerical indicia and said coacting member being further provided with third marking means co-operating with said indicia for giving an accommodation-quotient reading upon displacement of said members into positions respectively determined by said adjusting means during rheobase and accommodation-threshold measurements.
Claim 4
Dependent Claim
192 words
An electrodiagnostic apparatus comprising: constant-current-generating means provided with adjusting means for varying the magnitude of the output current thereof; mode-selector means connected to said constant-current-generator means for alternately positioning same in a sawtooth-wave mode and in a square-wave mode; and indicator means including a stationary support carrying a logarithmic scale, a setting member displaceable relatively to said support and provided with first marking means co-operating with said scale to give an accommodation-threshold reading upon a testing of a patient with said output current in said sawtooth-wave mode, and a coacting member displaceable relatively to said support independently of said setting member and provided with second marking means co-operating with said scale to give a rheobase reading upon a testing of a patient with said output current in said square-wave mode, at least one of said members being coupled with said adjusting means for entrainment thereby, said setting member being further provided with numerical indicia and said coacting member being further provided with third marking means co-operating with said indicia for giving an accommodation-quotient reading upon displacement of said members into positions respectively determined by said adjusting means during rheobase and accommodation-threshold measurements.
Claim 5
Dependent Claim
64 words
An apparatus as defined in claim 1 wherein said setting and coacting members are a first disk and a second disk mounted on said support for rotation about a common axis, said numerical indicia being provided on a face of said first disk overlain by said second disk, said third marking means being a window on said second disk exposing part of said indicia.
Claim 6
Dependent Claim
44 words
An apparatus as defined in claim 1 wherein said constant-current-generating means comprises an operational amplifier provided with a pair of differential inputs and with a resistive feedback connection to one of said inputs, said mode-selector means being connected to the other of said inputs.
Claim 7
Dependent Claim
41 words
An apparatus as defined in claim 3 wherein said adjusting means comprises a potentiometer in series with said mode-selector means having a slider connected to said other of said inputs, said slider being coupled with said setting member for entraining same.
Claim 8
Dependent Claim
87 words
An apparatus as defined in claim 3 wherein said adjusting means comprises a first potentiometer and a second potentiometer, said first potentiometer having a first slider coupled with said setting member for entraining same, said second potentiometer having a second slider coupled with said coacting member for entraining same, said mode-selector means including a source of sawtooth voltage connected to said first potentiometer, a source of square-wave voltage connected to said second potentiometer and switchover means for alternately connecting said sliders to said other of said inputs.
Claim 9
Dependent Claim
31 words
An apparatus as defined in claim 3 wherein said feedback connection is provided with switch means for halving the resistance thereof to provide a chronaxie reading on said first marking means.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |