Growing rod systems and methods for correcting spinal deformities include at least one growing rod assembly and at least one fluid delivery assembly. Compression type determination means 14 compare a predictive error of the found vector position and an average deviation within the frame, and select the compression type with high compression efficiency. Available DMA slots are determined from a pool of available DMA slots and allocated for media data traffic. Low resistance polysilicon local source interconnects can also couple to an increased number of memory cells, thereby reducing the number of contacts made to an array ground. The bioactive agents can be chosen to induce vascularization andor prevent barrier cell layer formation in vivo, and are advantageous when used with implantable devices wherein solutes are transported across the device-tissue interface.