Medical systems, devices, and methods for delivering one or more fluids

A medical device, comprising:

• an end cap, the end cap comprising:
• a fixed portion;
• a first movable portion;
• and
• a second movable portion,
• wherein the fixed portion of the end cap includes a first section and a second section partitioned by a wall, wherein the first section and the second section are configured to receive first and second materials, respectively,
• wherein the first movable portion is disposed within the first section and the second movable portion is disposed within the second section;
• wherein, in a first configuration, the first movable portion is in a proximal position within the first section of the fixed portion, and the second movable portion is in a proximal position within the second section of the fixed portion, wherein each of the first section and the second section has a first volume;
• and
• wherein, in a second configuration, the first movable portion is in a distal position within the first section of the fixed portion such that the first section has a second volume, wherein the second volume is less than the first volume.

A method, comprising:

• delivering a medical system to a treatment site, wherein the medical system includes:
• a scope;
• a medical device, the medical device comprising:
• a handle having a first movable body and a stationary body;
• an end cap removably coupled to a distal end of the scope, the end cap comprising an inner portion, an outer portion, and at least one biasing member, wherein the inner portion is coupled to the first movable body of the handle by one or more control elements, wherein the outer portion defines a receptacle, wherein the at least one biasing member is disposed between a proximal face of the inner portion and a distal face of a proximal wall of the outer portion;
• and
• a material, wherein the material is disposed within the receptacle of the end cap;
• moving the first movable body relative to the stationary body by a first distance such that (a) a tension in the one or more control elements is decreased by a first amount and (b) the at least one biasing member is extended by a first amount to move the inner portion of the end cap relative to the outer portion of the end cap by a first distance;
• and
• delivering a first amount of the material.