Impedance feedback monitor for electrosurgical instrument
US5558671A · kind A · utility
Inventor
Key dates
| Filing date | Sep 23, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Sep 23, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2090/032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An impedance monitoring device is provided for monitoring the electrical impedance of tissue as it is treated with electrosurgical energy. Based on a predicted model of tissue impedance and a number of initial impedance readings, the impedance at which tissue treatment is completed is predicted. More particularly, a minimum impedance level is measured and a function of the minimum impedance is used to determine impedance at which coagulation is completed. A control device is provided for bringing the output of the generator within an optimum range based on a system load curve. In one embodiment the impedance monitoring device is used in conjunction with a bipolar electrosurgical instrument. Preferably, the instrument comprises electrically opposite electrodes located on one or more tissue engaging surfaces for engaging tissue to be treated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.