An apparatus includes a coupling portion, a bioerodible anchor portion and a bioerodable retainer. The coupling portion is configured to be coupled to an electrical conductor. The bioerodible retention portion is adjacent to the coupling portion and is moveable from a collapsed configuration to an expanded configuration. The bioerodible retention portion is configured to anchor the electrical conductor with respect to body tissue when the bioerodible retention portion is in its expanded configuration. The bioerodible anchor portion is formulated to erode when disposed within the body tissue at a first rate. The bioerodible retainer is coupled to the bioerodible anchor portion and is configured to inhibit movement of the bioerodible anchor portion from the collapsed configuration to the expanded configuration. The bioerodible retainer is formulated to erode when disposed within the body tissue at a second rate greater than the first rate.