CPC A61B 18/1206 (2013.01) [A61B 18/16 (2013.01); A61B 2018/0072 (2013.01); A61B 2018/0075 (2013.01); A61B 2018/00351 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00702 (2013.01); A61B 2018/00767 (2013.01); A61B 2018/00791 (2013.01); A61B 2018/00845 (2013.01); A61B 2018/00875 (2013.01); A61B 2018/126 (2013.01); A61B 2018/1253 (2013.01); A61B 2018/1467 (2013.01)] | 20 Claims |
1. An ablation system, comprising:
(a) multiple electrodes configured to contact body tissue of a patient, including:
(i) two or more ablation electrodes for contacting respective locations in a target anatomical structure, and
(ii) a return electrode;
(b) a signal-generating unit comprising multiple signal generators, which are configured to apply respective composite signals to respective ones of the ablation electrodes, the composite signals comprising multiple, respective signal components, including:
(i) respective ablation signals, having different, respective ablation-signal amplitudes and phases at a common ablation-signal frequency, and
(ii) respective probe signals having respective probe-signal amplitudes and different respective probe-signal frequencies; and
(c) a processor configured:
(i) to measure the probe signals received by each of the multiple electrodes,
(ii) to compute from the measured probe signals an admittance matrix between the multiple electrodes, and
(iii) to set the ablation-signal amplitudes and phases, responsively to the admittance matrix and desired levels of unipolar and bipolar currents, so as to cause respective selected unipolar and bipolar ablation currents to emanate from the electrodes into the body tissue.
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