Electrosurgical generator and system
US6416509B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1998 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Mar 26, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/6027
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An electrosurgical system including an electrode assembly having two electrodes for use immersed in an electrically conductive fluid has a generator with control circuitry for rapidly reducing the delivered radio frequency output power by at least 50% within at most a few cycles of the peak radio frequency output voltage reaching a predetermined threshold limit. In this way, tissue coagulation can be performed in, for example, saline without significant steam generation. The same peak voltage limitation technique is used in a tissue vaporization or cutting mode to limit the size of the steam pocket at the electrodes and to avoid electrode burning. In a blended mode, the output voltage is alternately limited to a value appropriate for coagulation and a value appropriate for cutting or vaporization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.