Active agent (26) is released in the lumen or tissue of the vessel sections (22, 24, 25) arranged proximally at the blood flow direction of the vessel (10). The catheter (18) as an implant is arranged about 0.5 cm to the nearest stent (16). The magnesium alloy comprises yttrium (3.7-5.5 wt%), rare earth compound (1.5-4.4 wt%) and remainder (greater than 1 wt%). An independent claim is included for method for treating expanded obliterative illnesses of a container.