System and method for augmented impedance sensing
US7956620B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 2009 |
| Grant date | Jun 7, 2011 |
| Priority date | — |
| Expiry date | Nov 20, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/1286
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An impedance monitoring circuit for an electrosurgical generator is disclosed. The monitoring circuit includes an isolation transformer coupled to at least one of an active terminal and a return terminal of an electrosurgical generator, wherein the isolation transformer includes a primary winding coupled to a reference resistor and a secondary winding coupled to a load. The monitoring circuit also includes a driver configured to transmit a sensor signal to the reference resistor and the load, a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load. The monitoring circuit further includes a secondary converter coupled to the driver and configured to detect a secondary converted signal as a function of the sensor signal prior to passing through the reference resistor and the load and a controller configured to determine a fault condition based on the primary and secondary converted signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.