| 摘要 |
2149311 9410904 PCTABS00032 An ablation catheter has an ablation electrode (12) at a distal end coupled to an ablation power source (18) through a low impedance coupling (16). The ablation electrode also functions as a sensing electrode, for monitoring the endocardial signal and preferably also tissue impedance during the ablation procedure, and is coupled to an electrode monitor through a high impedance coupling (24). A timing element (34) operates a plurality of switches (20, 26, 32) to selectively isolate, dampen, or interconnect various signal paths during plural repetitive non-overlapping ablation and quiescent intervals which alternate at a rate substantially above a Nyquist sampling rate. RF energy is delivered to the ablation site during the ablation intervals. The local endocardial signal is measured during the quiescent intervals.
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