Abstract: A mini-loop cardiac ablation catheter having a shaft having a proximal end, a distal end, and at least one loop extending from the distal end. A handle is coupled to the proximal end of the shaft, the handle having a steering mechanism. A plurality of electrodes are positioned on the loop electrically coupled to at least one electrical connector in the handle. the at least one electrical connector being configured to electrically coupled with an electrical ablation energy source to power the plurality of electrodes.

Abstract: A pulsed field ablation catheter for use in atrial fibrillation treatment having a distal steerable variable loop with multiple electrodes coupled to the distal end of a multilumen shaft and a handle coupled to the proximal end of the multilumen shaft. A shape imparting mechanism coupled to the handle is configured to change the shape of steerable loop by manipulating a steering mechanism to steer the steerable loop to the treatment site and a rotational actuator to change the diameter of the variable loop to better interface with varying human anatomy.