Patent ID: 7758631

Claim:
A bioabsorbable endoprosthesis comprising: a plurality of elongate elements interbraided into a tubular, radially expandable structure, each of the elongate elements having an outer surface, the elements including a bioabsorbable polymer adapted to undergo degradation in vivo, the elements including an elongate, axially extending reservoir portion adapted to collect a by-product of the degradation of the bioabsorbable polymer; wherein the each of the elements occupies a total element volume including a reservoir volume occupied by the at least one reservoir portion, and the reservoir volume is at least about ten percent of the total element volume; the number of elements, N, is equal to about (D/(0.022D+0.17))±4 filaments, where D, in mm, is the free state diameter of the tubular structure; and the elongate elements have a thickness, t in mm, of about (D/(1.8D+15))±0.03 mm, where D, in mm, is the free state diameter of the tubular structure.