Apparatus for administering a therapeutic agent into tissue

An apparatus for administering a therapeutic agent comprising:

• a therapeutic agent generator;
• a scavenger in operable communication with said generator via a first valve for capturing said therapeutic agent;
• and
• a therapeutic agent administrator comprising a syringe having a barrel and a plunger, the barrel sufficient to maintain a discrete amount of said therapeutic agent, said administrator connectable to said generator via a second valve for selectively delivering said therapeutic agent, such that when said valves are in a first position said generator communicates with said administrator for filling said administrator with said agent and when said valves are in a second position said administrator retains said agent therein upon detachment from said generator and said scavenger captures any excess agent intermediate said administrator and said generator.