US3791373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable electroanesthesia device with automatic power control
Assignee: Southern Illinois University Carbondale
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Filing: 1972-03-02
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Granted: 1974-02-12
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Expires: 1992-03-02
Abstract
Abstract A portable, battery-powered, self-contained electroanesthesia device. A signal generator provides a sinusoidal, constant magnitude signal of fixed, preset frequency with relatively high accuracy and without recalibration each time the device is energized. The preset frequency characteristically produces electroanesthetic induction in a live subject with relatively high efficiency. An amplifier increases the power level sufficiently for producing electroanesthetic induction of the subject. Electrodes supply the amplified signal to tissue of the subject, there being provision for matching the impedance of said tissue of the subject to the amplifier for maximizing transfer of the amplified signal to said tissue. Circuitry is provided also for monitoring and limiting the power level of the signal supplied by said electrodes to the tissue.
Inventors
- 👤 E Winkler
- 👤 Gowan E Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:56
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/36014; A61N1/36021; A61N1/3603; A61N1/372; A61N1/378
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A portable, battery-powered and self-contained electroanesthesia device comprising: means for generating a substantially constant magnitude signal of substantially sinusoidal waveform at a fixed, preset frequency with relatively high accuracy and without requiring recalibration each time said device is energized, said preset frequency characteristically producing electroanesthetic induction in a live subject with relatively high efficiency; means for amplifying said signal to a power level suitable for producing electroanesthetic induction of the subject; means for supplying the amplified signal to tissue of the subject to cause electroanesthetic induction of the subject; means for matching the impedance of said tissue of the subject to said amplifying means for maximizing transfer of the amplified signal to said tissue; means for monitoring the power level of the signal supplied to said tissue; and means for automatically limiting the power of the signal supplied to said tissue to a maximum level, said power limiting means being adapted to sense the voltage applied to and the current drawn by said live subject.
Claim 2
Dependent Claim
165 words
A portable, battery-powered and self-contained electroanesthesia device comprising: means for generating a substantially constant magnitude signal of substantially sinusoidal waveform at a fixed, preset frequency with relatively high accuracy and without requiring recalibration each time said device is energized, said preset frequency characteristically producing electroanesthetic induction in a live subject with relatively high efficiency; means for amplifying said signal to a power level suitable for producing electroanesthetic induction of the subject; means for supplying the amplified signal to tissue of the subject to cause electroanesthetic induction of the subject; means for matching the impedance of said tissue of the subject to said amplifying means for maximizing transfer of the amplified signal to said tissue; means for monitoring the power level of the signal supplied to said tissue; and means for automatically limiting the power of the signal supplied to said tissue to a maximum level, said power limiting means being adapted to sense the voltage applied to and the current drawn by said live subject.
Claim 3
Dependent Claim
23 words
A portable, battery-powered electroanesthesia device as set forth in claim 1, said preset frequency being substantially equal to a harmonic of 700 Hz.
Claim 4
Dependent Claim
89 words
A portable, battery-powered electroanesthesia device as set forth in claim 1 wherein the power lImiting means includes means for summing voltages which vary as functions of the voltage and the current of the signal supplied to said tissue, means for generating a control signal which varies as a function of the summed voltages and which is thereby a function of the power level of the signal supplied to said tissue, and means responsive to said control signal for controlling the power level of the signal supplied to said tissue.
Claim 5
Dependent Claim
38 words
A portable, battery-powered electroanesthesia device as set forth in claim 3, said power limiting means further comprising manually variable means for preselecting a maximum level to which the power of the signal supplied to said tissue is limited.
Claim 6
Dependent Claim
24 words
A portable, battery-powered electroanesthesia device as set forth in claim 3 wherein said means responsive to said control signal comprises a field effect transistor.
Claim 7
Dependent Claim
36 words
A portable, battery-powered electroanesthesia device as set forth in claim 4 further comprising manually variable means for controlling the power level normally supplied to said tissue, and manually variable means for adjusting the maximum power level.
Claim 8
Dependent Claim
59 words
A portable, battery-powered electroanethesia device as set forth in claim 1 wherein the signal generating means comprises an oscillator including a resistance-capacitance feedback circuit causing oscillation at said preset frequency to supply said sinusoidal signal and a second feedback circuit comprising a resistance-capacitance controlled field effect transistor for causing said signal to be maintained substantially at said constant magnitude.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |