Apparatus and method for RF lesioning
US6280441A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1997 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/1435
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
To ablate target tissue a handle with proximal and distal ends connect to an interior passageway and along an axis. A semi rigid and helical effector at the distal end is along the axis and has a sharpened distal tip and a mount at its handle attachment. A source of radio frequency current supplies the effector and is insulated from the handle for delivery to bipolar and monopolar circuits. A return electrode connects between tissue and the source of radio frequency current. A sensor is carried on the handle positioned to measure target tissue ablation. A control couples the source of radio frequency current and the sensor for loop regulation of ablation. The effector is a wire bent into the helical shape with an insulating sleeve to prevent passage of radio frequency current near its mount. The sensor has a calculator to find impedance or temperature changes and the control examines for a rise. The effector is in an alternate a hollow tube bent into the helical shape and closed at its distal tip; the handle has a passage for fluid circulation. A return located on the effector insulating sleeve has a larger surface area than the distal tip. A bipolar delivery effector carries at le…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.