Treatment instrument for endoscope

A treatment instrument comprising:

• a tube, the tube including a conduit;
• a wire located in the tube so as to advance and retract in the tube and through which a high frequency current is allowed to flow;
• an electrode connected to a distal end of the wire;
• a distal end tip located at a distal end portion of the tube, the distal end tip configured to accommodate at least a part of the electrode;
• a locking portion located on an outer peripheral surface of the electrode and located proximally relative to a distal end of the electrode;
• and
• a locked portion located at a proximal end portion of the distal end tip, wherein, when the electrode is disposed at a first position where the electrode is fully retracted, the locking portion and the locked portion are locked with each other, and the distal end of the electrode is spaced from the distal end tip.

A treatment instrument comprising:

• a tube, the tube including a conduit;
• a wire located in the tube so as to of advance and retract in the tube and through which a high frequency current is allowed to flow;
• an electrode connected to a distal end of the wire;
• and
• a distal end tip with a passage connecting with an inner portion of the conduit and, the distal end tip configured to accommodate at least a part of the electrode,
• wherein the electrode includes a locking portion provided on an outer peripheral surface of the electrode and located proximally relative to a distal end of the electrode, and
• wherein the distal end tip includes a locked portion configured to lock with the locking portion and located proximally relative to the passage when the electrode is disposed at a first position where the electrode is fully retracted.