Implantable drug infusion devices, systems and methods for delivering therapeutic substance to a subject that include a bulkhead and an attached reservoir formed by an elastic bladder are disclosed. Each contact element includes an insulating carrier carrying conducting elements. When two panels are connected the moisture-repellent layers come together at the recesses, to form a joint which is protected from moisture. The present invention is able to optionally and more preferably use a plurality of different decision rules in order to select the most efficient method for erasing andor readingwriting data to the flash memory device. The system includes an optical device adapted to be placed in front of a viewer’s eyes, in which the optical axis for at least one eye is re-angled, so that each eye generally targets the center of a respective one of the pair of images.