The present invention is directed to stents that are formed into a helical
structure having a plurality of coils, a longitudinal axis, an internal
longitudinal passage, a distal section and a proximal section having
different diameters; where the structure is made from a fiber having a
cross-section and including an inner core having an exterior surface made
from a biodegradable polymer having a first degradation rate and an outer
section made from a blend of a first biodegradable polymer component and
a second biodegradable polymer component covering the exterior surface of
the inner core and having a second degradation rate; where the second
degradation rate is lower than the first degradation rate.
