Method and apparatus for impedance measurement in a multi-channel electro-surgical generator
US6293941A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1998 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Oct 6, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/923
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
This invention is an improved method and apparatus for tissue electrical impedance determination and electrical power control in a surgical device. In an embodiment of the invention an apparatus for controlling power delivery in an electro-surgical instrument is disclosed. The electro-surgical instrument includes a first channel and a second channel for delivery of energy to a surgical site. The apparatus includes: a switch, a measuring unit, a processor and a drive unit. The switch electrically isolates the second channel during a first measurement interval and the first channel during a second measurement interval. The measuring unit is coupled to the first and the second channel. The measurement unit measures a first power level of the first channel during a first measurement interval and a second power level of the second channel during a second measurement interval. The processor is coupled to the measuring unit and to the switch. The processor adjusts the first power level and the second power level to minimize a difference between a measured value of a control parameter and a target value of the control parameter. The drive unit is controlled by the processor. The drive unit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.