A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 5/02 (2006.01) A61B 5/042 (2006.01) A61B 18/14 (2006.01) A61B 17/39 (1990.01)
Patent
CA 2139312
A multi-electrode cardiac catheter (10) has pairs of electrodes (13) connected to sensing circuitry (31, 32, 40) to produce a differential signal. The sensing output is sharply defined and self normalizing. Preferably, a catheter ablation tip electrode (12) is an electrode of one pair, and the differential signal becomes non-zero when the tip contacts surrounding tissue. The shape of the differential signal provides information on the degree of electrode contact, as well as on the amount of locally-sensed tissue im- pedance change. The signal may be used as a trigger enable signal for a cardiac ablation catheter (10), and the applied level of RF power may be controlled based on the indicated degree of electrode contact and value of tissue impedance.
American Cardiac Ablation Co. Inc.
Riches Mckenzie & Herbert Llp
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