Reinforcing lumen rings are configured and adapted for use in conjunction with a circular endoscopic stapling instrument having a staple cartridge assembly and an anvil assembly. The reinforcing lumen rings maintain anastomotic lumen, e.g. as formed by the circular endoscopic stapling apparatus, in an...http://www.google.com/patents/US8192460?utm_source=gb-gplus-sharePatent US8192460 - Annular support structures
