A catheter for delivering a therapeutic agent to a target site of a human or animal subject can include a substantially flexible and biocompatible catheter body having a proximal end and a distal end. An eductor can be located at the distal end of the catheter body, and a first lumen within the catheter body for housing the therapeutic agent can be in fluid communication with the eductor. A second lumen, also in fluid communication with the first lumen, can extend from the proximal end of the catheter body towards the eductor and can have an output port at the distal end of the catheter body. The eductor can be operable to induce the therapeutic agent to flow from the first lumen out of the output port in response to fluid flowing through the second lumen.