Electrosurgical unit
US4051855A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1976 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | Feb 6, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/0066
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An electrosurgical unit for use in tissue cutting or coagulation procedur A vacuum tube oscillator operating in push-pull relationship generates RF oscillations which are extracted across a balanced coil transformer, the secondary of which is ungrounded. Forceps are provided to be connected across the output of the transformer for producing an isolated voltage for use in sealing off bleeding blood vessels. A handpiece is also provided for connection across the transformer output for selectively producing a cutting voltage or a coagulation voltage. An intensity control circuit is capable of connection in the power supply to control the output voltage. A pulse modulation unit is capable of being connected at the input of the oscillator to control the "on" time of the oscillator. A switching circuit operates to interconnect the intensity control to the power supply when the cutting probe is being utilized for cutting procedures, and connects the pulse modulation unit to the oscillator when the coagulation signal is being provided across either the forceps or the handpiece. An indifferent plate, also known as a dispersion electrode, is utilized together with the handpiece for cutting p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.