RF ablation apparatus and method using multi-frequency energy delivery
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United States of America Patent
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May 4, 2004
Grant Date -
Oct 23, 2003
app pub date -
Apr 22, 2002
filing date -
Apr 22, 2002
priority date (Note) -
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Abstract
A first power output with a first frequency is provided to a first set of electrodes while a second power output with a second frequency, different then the first frequency, is provided to a second set of electrodes. Power outputs are provided to electrodes so adjacent electrodes receive power outputs with different frequencies, thereby establishing a voltage potential between adjacent electrodes and bipolar current flow. The frequencies of the power outputs are selected such that the resultant waveform indicative of the magnitude of the amplitude difference between the outputs has a period short enough to avoid stimulation of excitable muscular and cardiac tissue. Periodic frequency switching between the first and second power output provides uniform current flow between the electrodes over a given period of time. The addition of a backplate establishes unipolar current flow.
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