BIODEGRADABLE DRUG-ELUITNG STENT PATTEN

摘要

An expandable tube-shaped scaffold (100) having a proximal end and a distal end defined about a longitudinal axis comprises: a) a plurality of pairs of first radially expandable undulating cylindrical rings (101) that are longitudinally aligned and are connected at a plurality of intersections by S-shaped links (17, 19) to form a plurality of beecomb-shaped cells (301); b) a plurality of second radially expandable undulating cylindrical rings (201) that have strut arms (12, 14) being longitudinally aligned across the middle of each beecomb-shaped cells (301) to form circumferentially a series of X-shaped patterns (401). The meandering among the first plurality of pairs of radially expandable undulating cylindrical rings (101), beecomb-shaped cells (301) and series of X-shaped second undulations (401) along the longitudinal axis form a unique pattern that provides the device both the flexibility and radial strength once it being expanded. The scaffold comprises a polymeric structure which polymer is bioabsorbable, biocompatible and structurally configured to fit within luminal structures such as blood vessels in the body. The novel designs of the scaffold may afford a flexibility and stretchability very suitable for implantation in the cardiovascular system.