Method and apparatus for control of ablation energy and electrogram acquisition through multiple common electrodes in an electrophysiology catheter
Method and apparatus for control of ablation energy and electrogram acquisition through multiple common electrodes in an electrophysiology catheter. A device that routes ablation energy to and that routes mapping signals received from an electrophysiology catheter having a plurality of conductive filaments including circuitry that provides, for each conductive filament when ablation energy is being delivered, an electrical signal path that has a low impedance for ablation energy and a high impedance for mapping signals. The device also includes circuitry that provides, for each conductive filament, when mapping signals are being received, an electrical signal path that has a high impedance for ablation energy and low impedance for mapping signals. At least one switch is provided that selectively groups electrodes into sectors for delivery of ablation energy.
1. A device for routing ablation energy to and for routing mapping signals received from an electrophysiology catheter having a plurality of conductive filaments comprising first and second filaments, the device comprising:
circuitry that provides an electrical signal path between the first and second filaments that has a low impedance when the first and second filaments are used to transmit ablation energy and a higher impedance when the first and second filaments are used to transmit mapping signals.
2. The device of claim 1 further comprising switching circuitry for selectively coupling filaments in the electrophysiology catheter to a source of ablation energy.
3. The device of claim 2 , wherein the switching circuitry selectively couples sectors of filaments to a source of ablation energy.
4. The device of claim 3 , wherein there are four sectors.
5. The device of claim 2 , wherein the switching circuitry selectively couples approximately a first half of the filaments in the electrophysiology catheter to a source of ablation energy.
6. The device of claim 5 , wherein the switching circuitry selectively couples approximately a second half of the filaments in the electrophysiology catheter to a source of ablation energy.
7. The device of claim 6 , wherein the first half of the filaments is interleaved with the second half of the filaments.
8. The device of claim 1 , wherein the circuitry comprises a capacitor in the electrical signal path of each conductive filament.
9. The device of claim 1 , further comprising a resistor respectively coupled to each conductive filament.
10. A catheter system comprising an electrophysiology catheter, an ablation energy generator, a recording device, and a device according to claim 1 that couples the electrophysiology catheter to the ablation energy generator and the recording device.