A bioabsorbable implantable endoprosthesis having elongate elements including hollow, cavity or porous portions adapted to accumulate by-product from the degradation of the bioabsorbable material and shortening the diffusion distance for water absorption and thereby relatively increasing the degradation...http://www.google.de/patents/US5980564?utm_source=gb-gplus-sharePatent US5980564 - Bioabsorbable implantable endoprosthesis with reservoir
