URETERAL STENT

摘要

A ureteral stent comprises an internal portion, which comprises a first polymer, and an external portion, which comprises a second polymer. The external portion surrounds the internal portion and has a plurality of radial projections that extend along the length of the ureteral stent. The second polymer has a Shore D hardness of 20-40 Shore D. The first polymer has a Shore D hardness that is at least 10 units greater than the Shore D hardness of the second polymer.