System and method for predicting lesion size shortly after onset of RF energy delivery

摘要

Lesion size or volume prediction shortly after the onset of an ablation procedure can inform or control the ablation procedure. The prediction and/or control is made without regard to an actual detected temperature in the vicinity of the ablation electrodes. As a consequence, the system has utility with irrigated catheter constructions and other situations in which local irrigation in the vicinity of an ablation site would otherwise interfere with a prediction or control scheme that solely relies upon temperature measurements.

主权项

1. A computer-implemented control system adapted to predict a lesion size in tissue after the onset of an RF ablation procedure, the procedure being conducted using an RF generator output to drive at least one ablation electrode supported on the distal section of a catheter, the catheter further having at least one temperature sensor, comprising:
a computer having a processor; a data acquisition system having multiple channels that provide data, including at least one channel providing data from the at least one ablation electrode; a plurality of modules each executing in the processor of the computer, including: a temperature determining module comprising a detection of temperatures in the vicinity of the at least one ablation electrode from the at least one temperature sensor and a control loop operatively responsive to a currently detected temperature of the temperatures to control a rise time to a target temperature; an RF control module operative to vary the RF generator output so as to maintain the target temperature for a duration of the RF ablation procedure; a regression algorithm operative to apply a formula and compute the prediction of the lesion size in the tissue, within five seconds after the onset of the RF ablation procedure, independent of the currently detected temperature from the at least one temperature sensor; and a user-interface module operative to provide from the computer onto a display at least the prediction of the lesion size to inform the RF ablation procedure.