Devices and methods for treatment of luminal tissue

An apparatus for treating tissue in a body lumen, the apparatus comprising:

• an expansion member;
• a dimensionally stable support furled around the expansion member;
• and
• a plurality of electrodes arranged on a surface of the dimensionally stable support at a pre-selected electrode density;
• wherein, as the expansion member expands, the dimensionally stable support unfurls to expose at least a portion of the plurality of electrodes that was covered by an overlapping portion of the dimensionally stable support.

A system for treating tissue in a body lumen, the system comprising:

• a balloon;
• a dimensionally stable support furled around the balloon;
• a plurality of electrodes arranged on a surface of the dimensionally stable support at a pre-selected electrode density;
• a power source in electrical communication with the plurality of electrodes;
• an inflation source in fluid communication with the balloon;
• and
• wherein, as the inflation source inflates the balloon, the dimensionally stable support unfurls to expose at least a portion of the plurality of electrodes that was covered by an overlapping portion of the dimensionally stable support.