A piece of buttress material and an end-effector of a surgical instrument including features which can aid a surgeon in properly and quickly attaching the piece of buttress material to the end-effector. In various embodiments, a piece of buttress material can include retention features which can be engaged...http://www.google.se/patents/US20090206142?utm_source=gb-gplus-sharePatent US20090206142 - BUTTRESS MATERIAL FOR A SURGICAL STAPLING INSTRUMENT
