than the inside diameter of the lumen 84 so that the dilator 86 may be freely axially advanced through the lumen 84 the dilator 86 is provided with a central lumen 88 for axially moveably receiving the proximal extension 64 of forming element 56 when assembled for deployment of a device 40 within the coronary vasculature a device 40 is positioned within a distal portion of the lumen 84 the dilator 86 is positioned proximal to the device 40 within the lumen 84 and the proximal extension 64 of forming element 56 extends proximally through central lumen 88 of dilator 86 during proximal movement of the introducer sheath 74 with respect to the dilator 86 a distal surface 90 on dilator 86 resists proximal movement of the device 40 thus the device 40 may be deployed from the distal end 80 of introducer sheath 74 in addition proximal retraction of the proximal extension 64 while proximal movement of the device 40 is prevented by surface 90 causes the device 40 to advance from its deployment configuration to its implanted configuration once the coronary sinus 22 has been cannulated by the introducer sheath 74 the dilator that is loaded over the forming element is advanced through the sheath 74 this is used to push the device 40 to the proper location with the distal tip 44 in the distal portion of the great cardiac vein 28 using counter traction of the forming element and the dilator the device is curved until the appropriate degree of annular remodeling.