Patent ID: 8556891
Filing Date: 2013-10-15
Classification: A61B,H02M

Abstract:
1. A medical system, comprising: a catheter having an ablation element and a sensor; a radiofrequency generator connected to the ablation element; a power supply defining a duty cycle and providing a voltage to the generator, the power supply having a duty cycle modulator and an amplitude modulator; and a processor connected to the power supply, the generator, and the sensor, the amplitude modulator including a variable resistance connected between the sensor and the processor, the variable resistance including a plurality of parallel resistors, each parallel resistor having a different ohmic resistance and being connected to a diode and a transistor; the processor being operable to obtain a feedback signal from the sensor, and adjust the duty cycle modulator and the amplitude modulator according to the feedback signal, the processor allowing electrical current through one or more of the parallel resistors by selecting and activating the corresponding transistor in order to adjust the amplitude modulator.