Medical systems, devices, and related methods

A medical device, comprising:

• a handle with a main part and a movable part, wherein at least one of the main part or the movable part includes a hub to couple an energy source to the handle;
• a shaft including a shaft lumen and a distal end, wherein the distal end includes a passive electrode that defines an opening extending through the passive electrode;
• an active electrode movable relative to the passive electrode through the opening, wherein the active electrode includes an electrode lumen in fluid communication with an outlet at a distal tip to deliver fluid, and wherein the distal tip of the active electrode includes a width that is greater than a width of the opening, as measured transverse to a longitudinal axis of the medical device;
• and
• a proximal support coupled to and partially overlapping with the active electrode, wherein the proximal support includes:
• a proximal support lumen that fluidly couples the shaft lumen to the electrode lumen, and
• a receiving lumen that extends parallel to a portion of the proximal support lumen,
• wherein the receiving lumen is configured to receive a portion of a drive element, such that the proximal support electrically connects the drive element to the active electrode,
• wherein movement of the movable part of the handle controls a position of the proximal support relative to the shaft, and also controls a position of the active electrode relative to the passive electrode between at least an extended position and a retracted position.

A medical device, comprising:

• a handle with a main part and a movable part, wherein at least one of the main part or the movable part includes a hub to couple an energy source to the handle;
• a shaft including a shaft lumen and a distal end, wherein the distal end includes a passive electrode that defines a central opening extending through the passive electrode;
• an active electrode movable within the central opening, wherein the active electrode includes an electrode lumen in fluid communication with an outlet at a distal tip to deliver fluid, and wherein the distal tip of the active electrode includes a width that is greater than a width of the central opening as measured transverse to a longitudinal axis of the medical device;
• a proximal support coupled to and partially overlapping with the active electrode, wherein the proximal support includes:
• a proximal support lumen that fluidly couples the shaft lumen to the electrode lumen;
• and
• a receiving lumen that extends parallel to a portion of the proximal support lumen,
• wherein the receiving lumen is configured to receive a portion of a drive element, such that the proximal support electrically connects the drive element to the active electrode;
• and
• the drive element, wherein the drive element extends from the handle to the proximal support to electrically connect the energy source to the active electrode, and to move the proximal support and the active electrode distally or proximally based on the relative movement between the main part and the movable part,
• wherein movement of the movable part of the handle controls a position of the proximal support relative to the shaft, and also controls a position of the active electrode relative to the passive electrode between at least an extended position and a retracted position.