Ablation catheter positioning system
US5341807A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1992 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Jun 30, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2018/1467
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A multi-electrode cardiac catheter has pairs of electrodes connected to sensing circuitry to produce a differential signal. The sensing output is sharply defined and self-normalizing. Preferably a catheter ablation tip electrode is an electrode of one pair, and the differential signal becomes non-zero when the tip contacts surrounding tissue. The shape of the differential signal provides information on the degree of electrode contact, as well as on the on the amount of locally-sensed tissue impedance change. The signal may be used as a trigger enable signal for a cardiac ablation catheter, and the applied level of RF power may be controlled based on the indicated degree of electrode contact and value of tissue impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.