A surgical stapling apparatus, comprising:a housing；an elongated member extending from the housing；a tool assembly supported on a distal end of the elongated member, the tool assembly including a first jaw member and a second jaw member；a cartridge assembly releasably supported on the first jaw member, the cartridge assembly including an actuation sled having a ramp (260)；the second jaw member defining a notch (219)；an anvil operably supported on the second jaw member； anda drive member having a working end configured to translate through the tool assembly when the first and second jaw members are in a closed configuration, the working end having a flange that engages the notch, and the drive member having a recess (216) for raising the drive member to avoid engagement of the flange in the notch.
