Medical systems, devices, and related methods

A medical device comprising:

• a handle including a movable part;
• a shaft comprising a proximal support, wherein the proximal support is configured to move responsive to movement of the movable part;
• an active electrode comprising a widened portion, wherein the active electrode is coupled to the proximal support;
• an end cap coupled to a distal end of the shaft, wherein the end cap includes:
• a passive electrode;
• a central lumen extending partially within the shaft;
• and
• a stop surface at a distal end of the central lumen,
• wherein a portion of the active electrode is positioned within the central lumen of the end cap, and
• wherein the stop surface is configured to limit distal extension of the active electrode based on contact between the widened portion of the active electrode and the stop surface of the end cap.

A method, comprising:

• inserting a distal portion of a medical device into a body cavity, wherein the medical device includes a shaft, an end cap coupled to a distal end of the shaft, and an active electrode partially positioned within an opening of the end cap;
• extending the active electrode distally, such that the active electrode is electrically isolated from a distal end portion of the end cap;
• energizing the active electrode;
• applying the active electrode to a treatment site in the body cavity to deliver electrical energy to the treatment site;
• retracting the active electrode proximally, such that the active electrode is electrically connected to the distal end portion of the end cap;
• and
• applying the active electrode and the distal end portion of the end cap to the treatment site to deliver the electrical energy to the treatment site.