Variable-output radiofrequency ablation power supply
AssigneeMedtronic Ablation Frontiers LLC
InventorCharu P. MATHUR
Life of this patent
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Abstract
A medical system is provided, including an ablation system having at least one ablation element and a sensor, a generator operable to deliver radiofrequency ablation energy to the ablation element. A power supply defines a duty cycle and provides a voltage to the generator, and the power supply has a duty cycle modulator and an amplitude modulator. A processor is connected to the power supply, the generator, and the sensor. The processor obtains a feedback signal from the sensor, and adjusts the duty cycle modulator and the amplitude modulator according to the feedback signal.
Claims20
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;
- wherein the processor is 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 medical system of claim 6, wherein each transistor is a metal-oxide semiconductor field-effect transistor.
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;
- a proportional-integral-derivative controller modulating the duty cycle;
- a variable resistance array of parallel resistors connected to the sensor, and a switch connected to each resistor;
- the variable resistance array modulating an amplitude of the voltage;
- a processor connected to the power supply, the generator, and the variable resistance array;
- wherein the processor obtains a feedback signal from the sensor, and adjust the duty cycle and the amplitude according to the feedback signal.
A method of treating a patient, comprising:
- providing an ablation system having a power supply, a generator, an ablation element, and a sensor;
- determining a desired parameter value;
- operating the power supply to define a duty cycle and an output voltage;
- placing the ablation element and sensor proximate to a treatment site;
- delivering electrical power from the power supply to the generator;
- delivering ablation energy from the generator to the ablation element;
- measuring a parameter with the sensor;
- comparing the measured parameter to the desired parameter value to determine a comparison value;
- and
- modulating the duty cycle and the output voltage to minimize the comparison value.
Dependencies are inferred from the claim text.