Patent US4638495A successfully refreshed from Google Patents.
Patent US2501299A successfully refreshed from Google Patents.
Patent US3961630A successfully refreshed from Google Patents.
US3961630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective circuit for radio-frequency electrosurgical device
Assignee: Dentsply Research and Development Corp
•
Filing: 1974-12-05
•
Granted: 1976-06-08
•
Expires: 1994-12-05
Abstract
Abstract An electrosurgical device in which high frequency electrical energy powers a cutting electrode. Radio frequency energy is set up in a driver coil and a driven coil mounted in a handpiece. The driver coil energizes the driven coil to energize a surgical electrode connected to one end of the driven coil. Connection between the source of radio frequency energy and the driver coil includes a circuit in which condensers and impedances are so connected that, if there is a failure of the condensers, energy is dissipated.
Inventors
- 👤 Donald I. Gonser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:40
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B18/14; A61B18/1402; A61B2018/00053; A61B2018/00172; A61B2018/00178; A61B2018/00636; A61B2018/0066
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
In an electrosurgical device, means for generating a radio-frequency electrosurgical current, a handpiece, means on the handpiece for holding an electrosurgical instrument, a passive electrode coupled to the generating means to provide return from a patient and a circuit connecting the generating means to the instrument holding means which comprises a plurality of condensers connected in series between the generating means and the instrument holding means and inductance means connected between successive condensers and ground, the inductance means discharging non-radio-frequency current to ground in the event of condenser failure.
Claim 2
Dependent Claim
89 words
In an electrosurgical device, means for generating a radio-frequency electrosurgical current, a handpiece, means on the handpiece for holding an electrosurgical instrument, a passive electrode coupled to the generating means to provide return from a patient and a circuit connecting the generating means to the instrument holding means which comprises a plurality of condensers connected in series between the generating means and the instrument holding means and inductance means connected between successive condensers and ground, the inductance means discharging non-radio-frequency current to ground in the event of condenser failure.
Claim 3
Dependent Claim
99 words
In an electrosurgical device, the combination of means for generating a radio-frequency potential between an output lead and a ground, a handpiece, means on the handpiece for holding an electrosurgical instrument, a passive electrode coupled to the generating means to provide return from a patient and a circuit connecting the output lead and the instrument holding means which comprises a plurality of condensers connected in series between the output lead and the instrument holding means, and inductance means connected between successive condensers and the ground, the inductance means discharging non-radio-frequency current to ground in the event of condenser failure.
Claim 4
Dependent Claim
99 words
In an electrosurgical device, the combination of means for generating a radio-frequency potential between an output lead and a ground, a handpiece, means on the handpiece for holding an electrosurgical instrument, a passive electrode coupled to the generating means to provide return from a patient and a circuit connecting the output lead and the instrument holding means which comprises a plurality of condensers connected in series between the output lead and the instrument holding means, and inductance means connected between successive condensers and the ground, the inductance means discharging non-radio-frequency current to ground in the event of condenser failure.
Claim 5
Dependent Claim
35 words
An electrosurgical device as in claim 2 wherein there are at least three condensers connected in series in the circuit connecting the output lead and the instrument holding means and at least two inductance means.
Claim 6
Dependent Claim
74 words
In an electrosurgical device, means for generating a radio-frequency electrosurgical current, a handpiece, means on the handpiece for holding an electrosurgical instrument, a passive electrode coupled to the generating means to provide return from a patient and a circuit connecting the generating means to the instrument holding means which includes in its output a grounding means to discharge non-radio-frequency current to ground should radio-frequency coupling circuits electrically fail in the output of the device.
Claim 7
Dependent Claim
74 words
In an electrosurgical device, means for generating a radio-frequency electrosurgical current, a handpiece, means on the handpiece for holding an electrosurgical instrument, a passive electrode coupled to the generating means to provide return from a patient and a circuit connecting the generating means to the instrument holding means which includes in its output a grounding means to discharge non-radio-frequency current to ground should radio-frequency coupling circuits electrically fail in the output of the device.
References Cited (Backward Citations)
SU166452A1
Cited
FR1128769A
Cited
US3058470A
Cited
GB855459A
Cited
US3675655A
Cited
US3707149A
Cited
US3730188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |