High density electrode mapping catheter

A medical device, comprising:

• a catheter shaft comprising a proximal end and a distal end, the catheter shaft defining a catheter shaft longitudinal axis;
• a flexible tip portion located adjacent to the distal end of the catheter shaft, the flexible tip portion comprising a planar array comprising a first inboard arm, a second inboard arm, a first outboard arm, and a second outboard arm, each arm having a top face and a bottom face;
• and
• a plurality of curved electrode pairs disposed on each of the first inboard arm, the second inboard arm, the first outboard arm, and the second outboard arm, the plurality of curved electrode pairs forming a flexible array of curved electrodes adapted to conform to tissue, wherein each pair of the plurality of the curved electrode pairs includes a top curved electrode disposed on the top face of the respective arm and a bottom curved electrode disposed on the bottom face of the same respective arm,
• wherein each curved electrode of the plurality of curved electrode pairs does not extend around an entire circumference of each of the first inboard arm, the second inboard arm, the first outboard arm, and the second outboard arm,
• wherein selected ones of the plurality of curved electrode pairs are configured to be deactivated to form a pattern of a plurality of activated curved electrode pairs, the plurality of activated curved electrode pairs being configured to measure electrical signals produced by the tissue of a patient and provide ablation therapy to the tissue,
• wherein the plurality of curved electrode pairs disposed on one of the first inboard arm, the second inboard arm, the first outboard arm, and the second outboard arm are longitudinally staggered from the plurality of curved electrode pairs disposed on an adjacent one of the first inboard arm, the second inboard arm, the first outboard arm, and the second outboard arm to form an alternating arrangement,
• wherein, for each pair of the plurality of the curved electrode pairs, a first circumferential width of the top curved electrode is less than a second circumferential width of the bottom curved electrode such that a circumferential gap between edges of the top curved electrode and edges of the bottom curved electrode is between 20 degrees and 60 degrees.