Surgical stapling device with lockout

A tool assembly comprising:

• a cartridge assembly including a staple cartridge and an actuation sled positioned within the staple cartridge, the actuation sled movable from a retracted position to an advanced position to eject staples from the staple cartridge;
• and
• an anvil assembly pivotally secured to the cartridge assembly and movable in relation to the cartridge assembly between open and clamped positions, the anvil assembly including an anvil body, an anvil cover, and a lockout member, the anvil body including an anvil member having an inner surface defining a plurality of staple deforming pockets, an outer surface defining a longitudinal groove, a central knife slot extending between the inner and outer surfaces, and a through bore extending between the inner and outer surfaces, the anvil cover defining a cutout and being secured to the anvil body to define a longitudinal channel within the anvil assembly, the lockout member having a horizontal portion and a vertical portion, the lockout member longitudinally retained within a proximal portion of the anvil assembly as the actuation sled moves from the retracted position to the advanced position, wherein the lockout member is movable from a first position in which the horizontal portion of the lockout member is positioned within the longitudinal channel of the anvil assembly to a second position in which the horizontal portion of the lockout member is positioned within the cutout of the anvil cover of the anvil assembly.

A tool assembly comprising:

• a cartridge assembly including a staple cartridge and an actuation sled positioned within the staple cartridge, the actuation sled movable from a retracted position to an advanced position to eject staples from the staple cartridge;
• and
• an anvil assembly pivotally secured to the cartridge assembly and movable in relation to the cartridge assembly between open and clamped positions, the anvil assembly including an anvil body, an anvil cover, and a lockout member, the anvil body including an anvil member having an inner surface defining a plurality of staple deforming pockets, an outer surface defining a longitudinal groove, a central knife slot extending between the inner and outer surfaces, and a through bore extending between the inner and outer surfaces, the anvil cover defining a cutout and being secured to the anvil body to define a longitudinal channel within the anvil assembly, the lockout member having a horizontal portion and a vertical portion, wherein the lockout member is movable from a first position in which the horizontal portion of the lockout member is positioned within the longitudinal channel of the anvil assembly to a second position in which the horizontal portion of the lockout member is positioned within the cutout of the anvil cover of the anvil assembly;
• and
• a biasing member, the biasing member urging the lockout member towards the first position.

A surgical stapling device comprising:

• a handle assembly;
• an elongate body extending distally from the handle assembly;
• a drive assembly including a flexible drive beam and a working member, the working member including a vertical strut, an upper beam, and a lower beam, the drive assembly movable from a retracted position to an advanced position to move the actuation sled from its retracted position to its advanced position;
• and
• a tool assembly including:
• a cartridge assembly including a staple cartridge and an actuation sled positioned within the staple cartridge, the actuation sled movable from a retracted position to an advanced position to eject staples from the staple cartridge;
• and
• an anvil assembly pivotally secured to the cartridge assembly such that the tool assembly is movable in relation to the cartridge assembly between open and clamped positions, the anvil assembly including an anvil body, an anvil cover, and a lockout member, the anvil body including an anvil member having an inner surface defining a plurality of staple deforming pockets, an outer surface defining a longitudinal groove, a central knife slot extending between the inner and outer surfaces, and a through bore extending between the inner and outer surfaces, the anvil cover defining a cutout and being secured to the anvil body to define a longitudinal channel within the anvil assembly, the longitudinal channel positioned to receive the upper beam of the working member of the drive assembly, the lockout member having a horizontal portion and a vertical portion, wherein the lockout member is movable from a first position in which the horizontal portion of the lockout member is positioned within the longitudinal channel of the anvil assembly to obstruct distal movement of the upper beam of the working member within the anvil assembly to a second position in which the horizontal portion of the lockout member is positioned within the cutout of the anvil cover of the anvil assembly to allow distal movement of the upper beam of the working member within the anvil assembly;
• and
• a biasing member, the biasing member urging the lockout member towards the first position.