Patent US4024467A successfully refreshed from Google Patents.
US4024467A
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Method for controlling power during electrosurgery
Assignee: MDT Corp
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Filing: 1975-06-02
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Granted: 1977-05-17
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Expires: 1995-06-02
Abstract
Abstract A control circuit forelectrosurgical units establishes a particular output signal to patient electrodes in response to condition of the patient electrodes. The duty cycle of the output signal is reduced when the patient electrodes are not in contact with the patient so as to prevent unwanted cutting and the duty cycle is increased when both patient electrodes are in contact with the patient so as to maximize the coagulation effect. The invention includes method of adjusting coagulation power by varying the duty cycle and not the amplitude of the output signal.
Inventors
- 👤 Stephen William Andrews
- 👤 Stanley Woltosz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:31
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B2018/00636; A61B2018/00642; A61B2018/00696; A61B2018/00726; A61B2018/00773; A61B2018/00892
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
The method of controlling, during operating conditions, the average power of a pulse modulated output signal on an electrosurgical unit which comprises the following steps: selecting the mode of operation; providing a pulse modulated output signal having a constant amplitude; and varying the duty cycle of said output signal to obtain the amount of power desired for the particular operating conditions while allowing the amplitude to remain substantially constant.
Claim 2
Independent Claim
69 words
The method of controlling, during operating conditions, the average power of a pulse modulated output signal on an electrosurgical unit which comprises the following steps: selecting the mode of operation; providing a pulse modulated output signal having a constant amplitude; and varying the duty cycle of said output signal to obtain the amount of power desired for the particular operating conditions while allowing the amplitude to remain substantially constant.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |