Abstract
The new ablation catheter is composed of 36 crossing single wires. If stretched, it lies close to the catheter shaft. Unfolded to an umbrella, it has a diameter of 30 mm. The crossing wires form an insulated circular network of 6 mm breadth in front of the umbrella equator allowing high resolution mapping of the intracardial tissue surface. The same wire network is used for energy delivery in pulsed mode. 18 poles each were supplied with 5 ms pulses consecutively with a pause interval of 5 ms regulated by an electronic switchbox Quadrapulse (Bard). The Medusa-Box (Bard) was chosen to distribute the energy to the electrodes. The power level of generator was set to a fix rate of 100 W. If temperature exceeded 60°C at one of the four quadrant thermistors, the ensuing RF current impulses are bypassed to an internal resistor. We examined feasibility, acute efficacy of antrum isolation of the pulmonary veins (PVI) and the safety of the procedure when first tested in humans.
Published Version
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