RF bipolar steam generation ablation device

A system for bipolar ablation including a pair of coaxially-arranged electrodes within a sheath, the system comprising:

• a power source configured to selectively power between a first pole and a second pole;
• a source of saline solution;
• the pair of coaxially-arranged electrodes adapted for bipolar ablation and insertable into the sheath configured to be inserted through a bronchoscope insertable through an orifice of a body of a patient and into a lung of the body, the pair of coaxially-arranged electrodes including:
• a primary electrode having a first distal end positionable adjacent to a lesion within the lung and having a first proximal end selectively couplable with the first pole of a power source, the primary electrode defining a lumen therein extending from the first proximal end to the first distal end and configured to convey the saline solution from adjacent the first proximal end to the first distal end, the first distal end defining at least one opening to the lumen adjacent the first distal end;
• and
• a secondary electrode extending through the lumen of the primary electrode from the first proximal end to the first distal end, the secondary electrode having a second distal end extending through an annular ring into a distal range adjacent the first distal end and a second proximal end selectively couplable with the second pole of the power source, the secondary electrode being electrically insulated from the primary electrode except within the distal range, wherein the saline solution conveyed through the lumen and around the secondary electrode is receivable within the first distal end so as to be in electrical contact with the primary electrode and the secondary electrode, the saline solution being vaporizable within the first distal end between the primary electrode and the second distal end of the secondary electrode responsive to application of power across the first pole and the second pole of the power source to generate steam expellable through the at least one opening to apply the steam to ablate the lesion within the lung;
• and
• a user interface configured to control extension of the primary electrode and the secondary electrode through the bronchoscope within the body of the patient,
• wherein the secondary electrode extending through the lumen within the primary electrode forms an annular lumen coupled to the source to deliver the saline solution into the distal range,
• wherein the annular ring is disposed within the annular lumen of the primary electrode.