An apparatus for implanting a medical device is provided that can be severed by electrolysis from a delivery member positioned in a patient. The apparatus can include an electrolytically detachable component that interconnects the medical device and the delivery member. The detachable component can have at least one corrodible first portion being adapted to serve as an anode in electrolytic corrosion. The at least one first portion can define a body having an outer surface and at least one surface structure extending inwardly from the outer surface into the body. The first portion can be electrolytically corrodible when in contact with a body fluid such that the medical device may be severed by electrolysis.