In some embodiments, a medical fluid connector is configured to receive an emitter of therapeutic agents to be emitted into a fluid pathway within the connector, the medical fluid connector comprising a proximal female end, an intermediate region, a distal male end, and a fluid pathway extending from the proximal female end, through the intermediate region, to the distal male end. A retaining structure is positioned within the intermediate region. The retaining structure is configured to securely receive an emitter of one or more therapeutic agents in a position and orientation where the fluid pathway is configured to convey fluid moving longitudinally through the fluid pathway directly into a proximal region of the emitter, around one or more lateral surfaces of the emitter, and toward the distal male end.
