A stent, shunt, or plug, for at least partial insertion into a patient, can include a deformable elongated tubular body including a proximal portion and a distal portion and defining a longitudinal lumen of the tubular body therebetween. The deformable elongated body can be capable of an expanded state and a collapsed state. The tubular body can include a sheath and a plurality of magnetizable or magnetic elements for providing magnetic repulsion, after being magnetically actuated, to maintain the tubular body to maintain the expanded state.