Abstract: A drug delivery system provides for mixing various drugs in an optimally controlled manner, for using flow controllers to guide multiple drugs into a single or into multiple catheters, for enabling a single lumen catheter to treat a specific region with several drugs, for allowing for dilution of a concentrated drug in order to both increase the time between refilling and also for providing any concentration of a drug that might be desired, for using a buffer fluid to deliver exact amounts of several drugs from the same catheter or to separate several drugs within a single catheter, for using external fluid present in the human body either as a diluent or buffer fluid, and for providing for a drug testing/filler apparatus to be used prior to implant to ensure proper function and easy means of filling multiple reservoirs with different fluids, and also after implant for refilling operations.

Abstract: A drug delivery system provides for mixing various drugs in an optimally controlled manner, for using flow controllers to guide multiple drugs into a single or into multiple catheters, for enabling a single lumen catheter to treat a specific region with several drugs, for allowing for dilution of a concentrated drug in order to both increase the time between refilling and also for providing any concentration of a drug that might be desired, for using a buffer fluid to deliver exact amounts of several drugs from the same catheter or to separate several drugs within a single catheter, for using external fluid present in the human body either as a diluent or buffer fluid, and for providing for a drug testing/filler apparatus to be used prior to implant to ensure proper function and easy means of filling multiple reservoirs with different fluids, and also after implant for refilling operations.