Patent ID: 8357149

Claim:
Medical apparatus for safely administering contraindicated simultaneous ablation and pacing in a heart of a subject, comprising: a pacing generator, which has first active and indifferent outputs and is configured to generate electrical pacing pulses between the first active and indifferent outputs for pacing a heart of a subject; a radio frequency (RF) generator, which has second active and indifferent outputs and is configured to generate RF electrical energy of a predetermined frequency between the second active and indifferent outputs for applying ablation to the heart of the subject simultaneously with the pacing pulses; a filter comprising a first branch connected between the first and second active outputs and a second branch connected between the first and second indifferent outputs, each of the first and second branches comprising one or more notch filters having a high impedance in a vicinity of the frequency of the RF electrical energy and wherein the filter comprises a third branch, which is connected between the first and second branches and the first active and indifferent outputs and which comprises a further one or more notch filters that have a low impedance in the vicinity of the frequency of the RF electrical energy, wherein the filter prevents leakage of RF energy from the RF generator into the pacing generator; and a mixer for combining the first active and indifferent outputs with the second active and indifferent outputs and forming a combined RF and pacing waveform for delivering contraindicated simultaneous ablation and pacing in the heart of the subject.