Rf guidewire needle with passive electrode sheathing design

A system for creating a channel in a target tissue, the system comprising:

• a perforation device having a passive electrode sheathing design, the perforation device comprising:
• an elongate body having a proximal portion including a proximal end and a distal portion including a distal end;
• at least one electrode located at the distal end, the at least one electrode being configured to receive energy for piercing a target tissue;
• at least one conductor extending from the proximal end to the at least one electrode;
• and
• a movable insulation sheath configured to move from a first position to a second position, wherein the first position covers the at least one electrode and the second position exposes the at least one electrode;
• and
• a dilator configured to dilate an opening in the target tissue created by the at least one electrode.

A method for puncturing a target tissue, the method comprising:

• advancing a perforation device having a movable insulation sheath towards a target tissue;
• causing the movable insulation sheath to move from a first position covering at least one electrode to a second position exposing the at least one electrode;
• delivering energy to the at least one electrode;
• and
• puncturing the target tissue.