Biodegradable endoprostheses and methods for their fabrication

Abstract

Biodegradable endoprostheses are formed from amorphous polymers having desirable biodegradation characteristics. The strength of such amorphous polymers is enhanced by annealing to increase crystallinity without substantially increasing the biodegradation time.

1 .- 30 . (canceled) 
     
     
         31 . An expandable stent, comprising:
 a biodegradable polymeric material having an initial configuration, said expandable stent being expandable to a larger configuration without fracture.