Method and system for radiofrequency ablation of tissue
US5540681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Jan 10, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/273
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system for delivering radiofrequency energy to ablate tissue comprises a radiofrequency generator and an intravascular catheter. The catheter includes both a radiofrequency ablation electrode and a temperature sensor within its distal end. Delivery of power to the ablation electrode may then be controlled based on electrode temperature using a cascade control system wherein analog temperature controller adjusts the set point to a secondary power controller. Alternatively, power delivered to the patient can be controlled directly based on a power set point. A sinusoidal RF signal is provided to avoid energy attenuation and the sinusoidal RF signal may be pulsed to avoid buildup of coagulum on the catheter tip while providing high power to create large lesions. A verification circuit checks the continuity of circuits in the catheter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.