Patent ID: 8562670

Claim:
An implantable, intraluminal prosthesis comprising: a plurality of interconnected struts that form a tubular structure, each of the struts having a luminal surface facing radially inward and an abluminal surface facing radially outward, at least some of the struts having through-holes with opposite end openings located at the abluminal and luminal surfaces, each of the through-holes having an inner surface with a geometric retention feature at a middle segment of the through-hole, the geometric retention feature having a predetermined shape corresponding to a distention of the through-hole or corresponding to a constriction of the through-hole; and a plurality of bioabsorbable depots, each bioabsorbable depot carried in a separate one of the through-holes, each bioabsorbable depot including a geometric feature configured to engage the geometric retention feature of a corresponding one of the through-holes, wherein the bioabsorbable depot includes a first layer of a first bioabsorbable polymer and a second layer of a second bioabsorbable polymer, the geometric feature is formed by the first bioabsorbable polymer, and the first bioabsorbable polymer has a resistance to decrease in one of or both of molecular weight and material strength, the resistance being greater than that of the second bioabsorbable polymer.