Electrode support structure assemblies

An electrode support structure assembly comprising:

• an electrode support structure comprising a proximal end and a distal end and defining a longitudinal axis, wherein the electrode support structure is configured to be radially outwardly expandable relative to the longitudinal axis to an expanded arrangement and radially inwardly collapsible relative to the longitudinal axis to a collapsed arrangement, the electrode support structure comprising:
• a plurality of splines, each of the plurality of splines having a proximal end portion and a distal end portion opposing the proximal end portion, wherein the distal end portion of each of the plurality of splines comprises:
• a first connection element configured to connect the distal end portion to a first adjacent spline;
• and
• a second connection element configured to connect the distal end portion to a second adjacent spline,
• wherein the first connection element, second connection element, and each of the plurality of splines are integrally formed, and
• wherein at least a portion of the distal end portion of each of the plurality of splines is disposed substantially along the longitudinal axis of the electrode support structure.