US3675655A
Expired / Lapsed
US
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Method and apparatus for high frequency electric surgery
Assignee: Electro Medical System Inc
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Filing: 1970-02-04
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Granted: 1972-07-11
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Expires: 1990-02-04
Abstract
Abstract A method and apparatus for electric surgery includes generating oscillations of high frequency electric energy of substantially constant amplitude, controlling the duration of and spacing in time between each series of oscillations generated and applying the generated energy through an electrode for the purpose of making surgical incisions and coagulating blood at the point of incision. A common generator serves as a source of the electric energy for different surgical procedures, the duration and spacing between each series of oscillations being closely controlled according to their intended application and in such a way as to minimize power requirements and the possible hazards of use either to the doctor or to the patient.
Inventors
- 👤 Weldon Rex Sittner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:59
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B2018/00636; A61B2018/0066
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A method for high frequency electric surgery comprising the steps of: generating a continuous periodic waveform of high frequency electric energy wherein within each period of the waveform of the order of tens of microseconds there is at least one burst of substantially constant amplitude oscillations of high frequency electric energy with the duration of the burst being a predetermined fraction of the period of the waveform; and continuously applying the generated energy to a body site where a surgical change is desired in said body site.
Claim 2
Independent Claim
87 words
A method for high frequency electric surgery comprising the steps of: generating a continuous periodic waveform of high frequency electric energy wherein within each period of the waveform of the order of tens of microseconds there is at least one burst of substantially constant amplitude oscillations of high frequency electric energy with the duration of the burst being a predetermined fraction of the period of the waveform; and continuously applying the generated energy to a body site where a surgical change is desired in said body site.
Claim 3
Dependent Claim
20 words
A method as set forth in claim 1 wherein said electric energy is oscillating at a frequency of about 0.5MHz.
Claim 4
Dependent Claim
32 words
A method as Set forth in claim 1 wherein the bursts of high frequency electric energy are about 10 microseconds in duration and the time interval between bursts is about 40 microseconds.
Claim 5
Dependent Claim
35 words
A method as set forth in claim 1 wherein the bursts of high frequency electric energy are about 15 microseconds in duration and the time interval between the bursts of energy is about 20 microseconds.
Claim 6
Dependent Claim
40 words
The method of claim 1 wherein said predetermined fraction is in the order of one fourth, and the generated energy is continuously applied to said body site when it is desired to coagulate the blood flowing from said body site.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein said predetermined fraction is in the order of four sevenths.
Claim 8
Dependent Claim
110 words
Electrosurgical apparatus comprising: generator means for generating a continuous periodic waveform of high frequency electric energy wherein within each period of the waveform there is at least one burst of substantially constant amplitude oscillations of high frequency electric energy with the duration of the burst being a fraction of the period of the waveform; selective control means including an assymetrical waveform generator for selectively controlling said generator means to change the fraction of the period in accordance with a desired surgical procedure; user operable means for switching on and off when desired, said generator means; and electrode means coupled to said generator means for application of the electric energy generated.
Claim 9
Dependent Claim
110 words
Electrosurgical apparatus comprising: generator means for generating a continuous periodic waveform of high frequency electric energy wherein within each period of the waveform there is at least one burst of substantially constant amplitude oscillations of high frequency electric energy with the duration of the burst being a fraction of the period of the waveform; selective control means including an assymetrical waveform generator for selectively controlling said generator means to change the fraction of the period in accordance with a desired surgical procedure; user operable means for switching on and off when desired, said generator means; and electrode means coupled to said generator means for application of the electric energy generated.
Claim 10
Dependent Claim
16 words
The invention recited in claim 7 wherein said generator means is operable to generate RF energy.
Claim 11
Dependent Claim
42 words
The invention recited in claim 7 wherein said electrode means includes: an indifferent electrode positioned against a body upon which surgery is to be performed, and an active electrode positioned for selectively applying the high frequency electric energy generated to said body.
Claim 12
Dependent Claim
44 words
The invention recited in claim 7 wherein said generator means includes an RF oscillator circuit having a resonant circuit and feedback network to sustain oscillations in the resonant circuit, said oscillator circuit being turned off by said control multivibrator by disabling said feedback network.
Claim 13
Dependent Claim
18 words
The apparatus of claim 7 and including means for changing the degree of assymetry of the assymetrical waveform.
References Cited (Backward Citations)
US2993178A
Cited
US3058470A
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GB897961A
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US3127895A
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US3478744A
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |