Method and apparatus for RF ablation and hyperthermia
US5807395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1997 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Apr 22, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2218/002
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A methods and apparatuses for ablation or hyperthermic treatment of body tissue are disclosed, wherein the application of radio-frequency ablative or hyperthermic energy is accompanied by the infusion of a conductive solution into the tissue, such that a virtual electrode is created. The virtual electrode results from the increased conductivity of the tissue in the area being treated due to the presence of conductive solution, such that the area of tissue being treated is enlarged as compared with non-fluid-assisted application of energy. In one embodiment, a catheter having a hollow helical electrode/needle on the distal end thereof is provided, such that the electrode/needle can be screwed into the tissue to be treated. A conductive fluid, such as saline, saturated saline, or Ringer's solution, is infused into the tissue to be treated via the hollow electrode and a lumen extending along the length of the catheter. In another embodiment of the invention, an implantable infusion port for fluid-assisted ablation and/or hyperthermia is provided with an elongate catheter having a hollow electrode/needle on the distal end thereof. The port is subcutaneously implanted with the electrode…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.