Flexible circuit electrodes for lasso catheter

A medical probe comprising:

• an insertion tube extending along a longitudinal axis;
• an end effector disposed at a distal end of the insertion tube, the end effector configured to bow radially outward from the longitudinal axis generally perpendicular to the longitudinal axis, the end effector comprising:
• a spine member;
• and
• an electrode assembly disposed along at least a portion of the spine member, the electrode assembly comprising:
• a flexible substrate;
• a plurality of electrical leads extending along at least a portion of the flexible substrate;
• and
• a plurality of electrodes disposed on the flexible substrate, each electrode of the plurality of electrodes electrically connected to at least one electrical lead of the plurality of electrical leads, the plurality of electrodes wrapped around the spine member, at least some of the electrodes of the plurality of electrodes are positioned facing away from the longitudinal axis.

A method comprising:

• forming a spine member into a generally circular shape;
• and
• helically wrapping the spine member with an electrode assembly, the electrode assembly comprising:
• a flexible substrate;
• a plurality of electrical leads extending along at least a portion of the flexible substrate;
• and
• a plurality of electrodes disposed on the flexible substrate, each electrode of the plurality of electrodes electrically connected to at least one electrical lead of the plurality of electrical leads, the plurality of electrodes positioned on the flexible substrate such that, when the electrode assembly is helically wrapped around the spine member, at least some of the electrodes of the plurality of electrodes are positioned to face away from an axis of the generally circular shape of the spine member.