A cartridge assembly for use with a surgical stapling instrument is disclosed. The cartridge assembly includes a channel, a cover, a staple cartridge and a knife. The channel includes a protrusion thereon. The cover is configured for mechanical engagement with the channel and includes a blocking member...http://www.google.com/patents/US7942303?utm_source=gb-gplus-sharePatent US7942303 - Knife lockout mechanisms for surgical instrument
