pSurgical stapling apparatus including an anvil and cartridge each having cooperating mating surfacesUS8801734Jul 30, 2010Aug 12, 2014Ethicon Endo-Surgery, Inc.Circular stapling instruments with secondary cutting arrangements and methods of using sameUS8801735Jul 30, 2010Aug 12, 2014Ethicon Endo-Surgery, Inc.Surgical circular stapler with tissue retention arrangementsUS8808311Feb 18, 2011Aug 19, 2