Patent US3898991A successfully refreshed from Google Patents.
US3898991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosurgical apparatus and method of operating same
Assignee: Olympus Corp
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Filing: 1973-12-13
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Granted: 1975-08-12
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Expires: 1993-12-13
Abstract
Abstract An electrical surgical knife device for use with an endoscope comprises a singular power source means which includes a high frequency signal generator for generating a high frequency signal, a low frequency signal generating means for generating a damped low frequency signal and an amplitude modulator for amplitude-modulating the high frequency signal by the damped low frequency signal. A selector means is provided with a switch coupled between the modulator and the low frequency signal generator, to cause the modulated damped high frequency signals to be supplied to the active and fixed electrodes of an electrical surgical knife when the switch is in the on state and to cause the unmodulated high frequency signal to be supplied to the electrodes when the switch is in the off state.
Inventors
- 👤 Yuji Ikuno
- 👤 Yutaka Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B2018/00636; A61B2018/0066
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
162 words
An electrosurgical apparatus comprising: an electrosurgical knife which includes an active electrode and a fixed electrode; a first oscillator means for generating a high frequency signal to control the knife; a second oscillator means for producing a damped lowfrequency signal of lower frequency than said high frequency signal, said second oscillator means compRising a low frequency generator and a clamping and differentiator circuit means coupled to the output thereof to clamp the output signal of the low frequency signal generator at a given value and to differentiate it to produce said damped low frequency signal; a modulator coupled to the output of said first and second oscillator means, the output of said modulator being coupled to said electrosurgical knife; and a selector means having a first condition to cause said modulator to amplitude-modulate said high frequency signal by said damped low frequency signal and having a second condition to cause said modulator to couple said high frequency signal, unmodulated, to said knife.
Claim 2
Dependent Claim
162 words
An electrosurgical apparatus comprising: an electrosurgical knife which includes an active electrode and a fixed electrode; a first oscillator means for generating a high frequency signal to control the knife; a second oscillator means for producing a damped lowfrequency signal of lower frequency than said high frequency signal, said second oscillator means compRising a low frequency generator and a clamping and differentiator circuit means coupled to the output thereof to clamp the output signal of the low frequency signal generator at a given value and to differentiate it to produce said damped low frequency signal; a modulator coupled to the output of said first and second oscillator means, the output of said modulator being coupled to said electrosurgical knife; and a selector means having a first condition to cause said modulator to amplitude-modulate said high frequency signal by said damped low frequency signal and having a second condition to cause said modulator to couple said high frequency signal, unmodulated, to said knife.
Claim 3
Dependent Claim
21 words
Apparatus according to claim 1 wherein said selector means comprises a switch connected between the modulator and the second oscillator means.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1 wherein said selector means comprises means coupled to the second oscillator means for controlling the oscillation condition of the second oscillator means.
Claim 5
Dependent Claim
26 words
Apparatus according to claim 1 wherein said selector means is coupled to the second oscillator means for selectively turning the second oscillator means on and off.
Claim 6
Dependent Claim
89 words
Apparatus according to claim 1 further compirsing a voltage amplifier whose input terminal is connected to the output terminal of said modulator, a power amplifier whose input terminal is connected to the output terminal of said voltage amplifier, a transformer whose input terminals are coupled to the output terminals of said power amplifier and respective direct current component blocking capacitors connected between the output terminals of said transformer and said electrosurgical knife for supplying the alternating current component of the output signal from the transformer to the electrosurgical knife.
Claim 7
Dependent Claim
32 words
Apparatus according to claim 1 wherein said clamping and differentiator circuit means clamps the output signal of the low frequency signal generator so that the output signal therefrom has only positive values.
Claim 8
Dependent Claim
130 words
A power source for providing an alternating current output signal for operating an electrical surgical knife comprising: a first oscillator means for generating a high frequency signal; a second oscillator means for producing a damped low frequency signal of lower frequency than said high frequency signal, said second oscillator means comprising a low frequency generator and a clamping and differentiator circuit means coupled to the output thereof to clamp the output signal of the low frequency signal generator at a given value and to differentiate it to produce said damped low frequency signal; a modulator whose input terminals are respectively coupled to the first and second oscillator means and providing said alternating current output signal; and a selector means to selectively supply the damped low frequency signal to the modulator.
Claim 9
Dependent Claim
130 words
A power source for providing an alternating current output signal for operating an electrical surgical knife comprising: a first oscillator means for generating a high frequency signal; a second oscillator means for producing a damped low frequency signal of lower frequency than said high frequency signal, said second oscillator means comprising a low frequency generator and a clamping and differentiator circuit means coupled to the output thereof to clamp the output signal of the low frequency signal generator at a given value and to differentiate it to produce said damped low frequency signal; a modulator whose input terminals are respectively coupled to the first and second oscillator means and providing said alternating current output signal; and a selector means to selectively supply the damped low frequency signal to the modulator.
Claim 10
Dependent Claim
23 words
A power source according to claim 7 wherein said selector means comprises a switch connected between the modulator and the second oscillator means.
Claim 11
Dependent Claim
29 words
A power source according to claim 7 wherein said selector means comprises means coupled to the second oscillator means for controlling the oscillation condition of the second oscillator means.
Claim 12
Independent Claim
79 words
A method of operating an electrosurgical knife apparatus comprising steps of: generating a high frequency signal; generating a low frequency signal of lower frequency than said high frequency signal; clamping and differentiating said low frequency signal to produce a damped low frequency clamped signal; selectively amplitude-modulating said high frequency signal with said damped low frequency signal to produce a modulated damped signal; and coupling one of the modulated damped signal and the high frequency signal to said electrosurgical apparatus.
Claim 13
Independent Claim
79 words
A method of operating an electrosurgical knife apparatus comprising steps of: generating a high frequency signal; generating a low frequency signal of lower frequency than said high frequency signal; clamping and differentiating said low frequency signal to produce a damped low frequency clamped signal; selectively amplitude-modulating said high frequency signal with said damped low frequency signal to produce a modulated damped signal; and coupling one of the modulated damped signal and the high frequency signal to said electrosurgical apparatus.
Claim 14
Dependent Claim
29 words
The method according to claim 10 wherein said step of selectively amplitude-modulating said high frequency signal comprises selectively coupling said damped low frequency sIgnal to said high frequency signal.
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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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |