Surgical stapling apparatus with adjustable height clamping member

A surgical stapling device comprising:

• a body portion defining a longitudinal axis having a proximal portion and a distal portion;
• a tool assembly supported on the distal portion of the body portion, the tool assembly including an anvil assembly, a channel member pivotally supported relative to the anvil assembly, and a staple cartridge releasably disposed within the channel member, the tool assembly being movable from an open position to an approximated position, the staple cartridge supporting a plurality of staples and including an actuation sled movable between a sled retracted position and a sled advanced position to eject the plurality of staples from the staple cartridge;
• and
• a drive assembly movably supported within the tool assembly from a drive retracted position to a drive advanced position to move the tool assembly from the open position to the approximated position and to maintain the tool assembly in the approximated position, the drive assembly including a clamping member, an adjustment member, and an adjustment beam, the clamping member including a first clamping surface configured to engage the anvil assembly and the adjustment member including a second clamping surface configured to engage the staple cartridge, the first clamping surface spaced from the second clamping surface to define a clamping height, wherein the adjustment member is moveable relative to the clamping member between a first position and a second position to change the clamping height, the adjustment beam extending proximally from the adjustment member into the body portion and moveable to move the adjustment member between the first position and the second position.