Expandable Mesh Platform for Large Area Ablation

A method of ablating a tissue, the method comprising:

• inserting a distal portion of an ablation device into a lumen of a patient, the ablation device comprising:
• a first elongate shaft having a proximal portion, a distal portion and a lumen extending at least partially therethrough;
• a elongate shaft having a proximal portion, a distal portion and a lumen extending at least partially therethrough, the first elongate shaft coaxially positioned and movable relative to the second elongate shaft;
• and
• a mesh member comprising a proximal portion and a distal portion, the proximal portion of the mesh member operably connected to the distal portion of the second elongate shaft and the distal potion the mesh member operably connected to an inner surface of the distal portion of the first elongate shaft, the mesh member having a first diameter and a second diameter greater than the first diameter and the mesh member comprising a conductive portion configured to contact a surface for ablation;
• positioning at least a portion of the mesh member at a treatment site;
• moving the first elongate shaft relative to the second elongate shaft to move the ablation device to an expanded configuration having the second diameter;
• pressing an end face of the mesh member against the surface;
• and
• applying energy to the tissue from an energy source.