US3987796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosurgical device
Assignee: Dentsply Research and Development Corp
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Filing: 1975-07-02
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Granted: 1976-10-26
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Expires: 1995-07-02
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. The relay is reset when a main power off-on switch is turned to off position.
Inventors
- 👤 Donald I. Gonser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:07
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/14; A61B18/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
In combination with a radio-frequency electrosurgical device, a radio-frequency generator means for powering the radio-frequency electrosurgical device and having a main power off-on switch means and a patient monitor means for detecting an abnormal operation, control means connected to the patient monitor means, the control means having a set position in which the control means provides connection between the main power off-on switch means and the radio-frequency generator means for powering the radio-frequency generator means when the main power off-on switch means is in the on position and an unset position, means connected to the patient monitor means for advancing the control means to the unset position in the event of an abnormal operation, means for resetting the control means when the main power off-on switch means is turned to the off position, and an electrical hold-in circuit means for the electrosurgical device for requiring that the main power off-on switch means be turned to the off position to reset the control means for normal operation.
Claim 2
Dependent Claim
166 words
In combination with a radio-frequency electrosurgical device, a radio-frequency generator means for powering the radio-frequency electrosurgical device and having a main power off-on switch means and a patient monitor means for detecting an abnormal operation, control means connected to the patient monitor means, the control means having a set position in which the control means provides connection between the main power off-on switch means and the radio-frequency generator means for powering the radio-frequency generator means when the main power off-on switch means is in the on position and an unset position, means connected to the patient monitor means for advancing the control means to the unset position in the event of an abnormal operation, means for resetting the control means when the main power off-on switch means is turned to the off position, and an electrical hold-in circuit means for the electrosurgical device for requiring that the main power off-on switch means be turned to the off position to reset the control means for normal operation.
Claim 3
Dependent Claim
212 words
A radio-frequency electrosurgical device which includes a radio-frequency generator, power source means for supplying power to the radio-frequency generator, a main power off-on switch means for connecting the power supply means to the radio-frequency generator, circuit means connected to the radio-frequency generator for performing electrosurgery on a patient, a patient monitoring circuit means for detecting an abnormal operation, control means connected to the patient monitoring circuit means, the control means having a set position in which the control means provides a connection between the main power off-on switch means and the radio-frequency generator for powering the radio-frequency generator when the main power off-on switch means is in the on position and an unset position in which the control means disables the power source means from powering the radio-frequency generator, means connected to the patient monitoring circuit means for advancing the control means to the unset position for disabling the power source means from powering the radio-frequency generator in the event of an abnormal operation, means for resetting the control means when the main power on-off switch means is turned to the off position, and an electrical hold-in circuit means for requiring that the main power off-on switch means be turned to the off position to reset the control means for normal operation.
Claim 4
Dependent Claim
212 words
A radio-frequency electrosurgical device which includes a radio-frequency generator, power source means for supplying power to the radio-frequency generator, a main power off-on switch means for connecting the power supply means to the radio-frequency generator, circuit means connected to the radio-frequency generator for performing electrosurgery on a patient, a patient monitoring circuit means for detecting an abnormal operation, control means connected to the patient monitoring circuit means, the control means having a set position in which the control means provides a connection between the main power off-on switch means and the radio-frequency generator for powering the radio-frequency generator when the main power off-on switch means is in the on position and an unset position in which the control means disables the power source means from powering the radio-frequency generator, means connected to the patient monitoring circuit means for advancing the control means to the unset position for disabling the power source means from powering the radio-frequency generator in the event of an abnormal operation, means for resetting the control means when the main power on-off switch means is turned to the off position, and an electrical hold-in circuit means for requiring that the main power off-on switch means be turned to the off position to reset the control means for normal operation.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |