US4114622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosurgical device
Assignee: Dentsply Research and Development Corp
•
Filing: 1976-06-01
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Granted: 1978-09-19
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Expires: 1996-06-01
Abstract
Abstract A radiofrequency electrosurgical device which includes an active electrode and a passive electrode coupled to a chassis ground of a radiofrequency generator of the device. If the passive electrode is disconnected from the chassis ground, a potential develops between the chassis ground and a system ground. This potential is used to actuate a relay to disable the radiofrequency generator if the passive electrode becomes disconnected.
Inventors
- 👤 Donald I. Gonser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:20
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
In combination with a radio-frequency electrosurgical device which includes a radio-frequency generator, circuit means connected to the radio-frequency generator for performing electrosurgery on a patient, said circuit means establishing a primary current return for substantially all the current passing from the patient to the radio-frequency generator when connected to the patient, means for establishing an alternate current return for at least part of said primary current return from the patient to the radiofrequency generator, and a monitoring system means connected to the alternate current return for sensing radiofrequency current passing in said alternate current return.
Claim 2
Dependent Claim
95 words
In combination with a radio-frequency electrosurgical device which includes a radio-frequency generator, circuit means connected to the radio-frequency generator for performing electrosurgery on a patient, said circuit means establishing a primary current return for substantially all the current passing from the patient to the radio-frequency generator when connected to the patient, means for establishing an alternate current return for at least part of said primary current return from the patient to the radiofrequency generator, and a monitoring system means connected to the alternate current return for sensing radiofrequency current passing in said alternate current return.
Claim 3
Dependent Claim
24 words
The combination as set forth in claim 1 wherein said alternate current return is coupled between a system ground and the radio frequency generator.
Claim 4
Dependent Claim
83 words
In combination with a radio-frequency electrosurgical device which includes a radio-frequency generator, circuit means connected to the radio-frequency generator for performing electrosurgery on a patient, said circuit means establishing a first current return path from the patient to the radio-frequency generator when connected to the patient, means for establishing an alternate current return path between ground and the radio-frequency generator and a monitoring system means connected to the alternate current return path for sensing radiofrequency current passing in said alternate current return path.
Claim 5
Dependent Claim
83 words
In combination with a radio-frequency electrosurgical device which includes a radio-frequency generator, circuit means connected to the radio-frequency generator for performing electrosurgery on a patient, said circuit means establishing a first current return path from the patient to the radio-frequency generator when connected to the patient, means for establishing an alternate current return path between ground and the radio-frequency generator and a monitoring system means connected to the alternate current return path for sensing radiofrequency current passing in said alternate current return path.
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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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |