A stent having varying outward radial force along its length. In use, the stent
can provide greater force in vessel regions requiring greater force and less force
in regions requiring less. In particular, more force is provided in the narrowed,
center of a stenosis, while not applying too much force to the adjoining healthy
tissue area. Greater stent expansion is provided in wider vessel geometries and
less stent expansion in narrower regions. Varying force is achieved varying the
number of elements, the density of elements, and the thickness of the elements.