US3601126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency electrosurgical apparatus
Assignee: Electro Medical System Inc
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Filing: 1969-01-08
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Granted: 1971-08-24
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Expires: 1989-01-08
Abstract
Abstract Electrosurgical apparatus including electrodes powered by high frequency electric current, wherein the amplitude of the current flowing through the circuit is monitored and compared with a reference amplitude so that the current source can be regulated to transmit power of a desired amplitude. Further, the waveform of the current can be selectively switched from a sinusoidal waveform to a pulsed waveform. Also, there is provided an indifferent or return electrode whose conductivity controls the operation of the power source.
Inventors
- 👤 Jerry R Estes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:37
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/16; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
High frequency electrosurgical apparatus for operating on electrically conductive tissue comprising first and second electrodes, each of said electrodes being adapted for electrically contacting tissue whereby an electric current path is established between said electrodes via said tissue, means for generating a high frequency electric current having a controllably varying amplitude, means for connecting said generating means to said electrodes, reference means for establishing a desired amplitude for the current passing through the tissue, sensing means for sensing the amplitude of the actual current passing through the tissue, and control means responsive to said reference means and said sensing means for controlling said generating means to generate a high frequency electric current having an amplitude substantially equal to said desired amplitude.
Claim 2
Dependent Claim
121 words
High frequency electrosurgical apparatus for operating on electrically conductive tissue comprising first and second electrodes, each of said electrodes being adapted for electrically contacting tissue whereby an electric current path is established between said electrodes via said tissue, means for generating a high frequency electric current having a controllably varying amplitude, means for connecting said generating means to said electrodes, reference means for establishing a desired amplitude for the current passing through the tissue, sensing means for sensing the amplitude of the actual current passing through the tissue, and control means responsive to said reference means and said sensing means for controlling said generating means to generate a high frequency electric current having an amplitude substantially equal to said desired amplitude.
Claim 3
Dependent Claim
41 words
Apparatus as in claim 1 wherein said generating means includes means for selectively operating said generating means to operate in a first mode to generate a continuous alternating current, or in a second mode to generate time-spaced packets of alternating current.
Claim 4
Dependent Claim
87 words
Apparatus as in claim 2 wherein said reference means comprises means for establishing a first desired amplitude for electric current related to said continuous alternating current generated by said generating means and a second desired amplitude for electric current related to said time-spaced packets of alternating current generated by said generating means, and further comprising selection means for simultaneously controlling the mode of operation of said generating means and controlling which desired amplitude of electric current is received by said control means for controlling said generating means.
Claim 5
Dependent Claim
48 words
The apparatus of claim 1 wherein said first electrode is an active electrode and said second electrode is an indifferent electrode, and means for rendering said generating means inoperative when an open circuit exists in the electrical circuit including the tissue, said indifferent electrode and said generating means.
Claim 6
Dependent Claim
146 words
High frequency electrosurgical apparatus for operating on electrically conductive tissue comprising: a controllably operable generating means for generating a high frequency electric current; an active electrode adapted to be applied to tissue at the situs of the operation; an indifferent electrode for contact with tissue at the situs of the operation, said indifferent electrode comprising a sheet of porous material, adhesive means connected to said sheet of material for removably affixing said indifferent electrode to tissue, and a pair of spaced electrical terminals in contact with said porous material; circuit means for connecting said active electrode and said terminals of said indifferent electrode to said generating means; and control means for rendering said generating means inoperative when the conductivity in a circuit including the tissue, said indifferent electrode and said circuit means connecting said indifferent electrode to said generating means is less than a given value.
Claim 7
Dependent Claim
146 words
High frequency electrosurgical apparatus for operating on electrically conductive tissue comprising: a controllably operable generating means for generating a high frequency electric current; an active electrode adapted to be applied to tissue at the situs of the operation; an indifferent electrode for contact with tissue at the situs of the operation, said indifferent electrode comprising a sheet of porous material, adhesive means connected to said sheet of material for removably affixing said indifferent electrode to tissue, and a pair of spaced electrical terminals in contact with said porous material; circuit means for connecting said active electrode and said terminals of said indifferent electrode to said generating means; and control means for rendering said generating means inoperative when the conductivity in a circuit including the tissue, said indifferent electrode and said circuit means connecting said indifferent electrode to said generating means is less than a given value.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |