A conditional processing method and apparatus for efficient memory management are provided. The spherical joint includes a dome on one portion coupled to a mating cup on the other portion. 1 mm, with a plurality of record tracks having data recorded thereon as embossed pits representing information and exhibiting a track pitch in the range between 0. When the lead body is pulled away from the electrode mounting pad and removed from the patient, any portion of the electrode mounting pad remaining within the patient dissolves over time and disappears. The illumination system is fully adjustable in terms of light intensity and direction of the light beams.