| 摘要 |
<p>An expandable intraluminal stent formed of a material comprised of an inner layer covered by an outer layer, both the inner and outer layers being of biodegradable polymeric composition and exhibiting different time periods of biodegradation is disclosed. The stent is constructed and arranged so that no portion of the inner layer is initially exposed. The stent may also be formed of a framework provided with a first layer of a biodegradable polymer and a second outer layer of a biodegradable polymer over the first layer. The outer layer is futher characterized in that it is a surface erodible polymer. Both the inner and outer layers may be impregnated with one or more drugs for drug delivery.</p> |
