A surgical stapling device includes a tool assembly including an anvil and a cartridge assembly that are movable in relation to each other between open and clamped positions. The cartridge assembly includes a staple cartridge that can be replaced after each firing of the stapling device to facilitate reuse of the stapling device. The anvil includes a lockout mechanism that prevents operation of the stapling device when the staple cartridge has been previously fired. The lockout mechanism is adapted to move from a locked position to an unlocked position when the staple cartridge is replaced and the tool assembly is moved from the open position to the clamped position.

A handle assembly includes a trigger assembly, a motor, and a drive assembly. The trigger assembly includes a trigger, a head portion, and a deflection member interconnecting the trigger and the head portion such that a load applied to the trigger causes the deflection member to flex to define a gap between the trigger and the head portion. The motor is configured to be activated based on a size of gap defined by the trigger and the head portion. The drive assembly includes a clamping gear, a firing gear assembly, a drive gear, and a rack. When a button of the trigger assembly engages the clamping gear, actuation of the trigger advances the rack by a first distance, and when the button engages the firing gear assembly, actuation of the trigger advances the rack by a second distance greater than the first distance.

An adapter assembly includes a switch actuator, an actuation bar, and a latch. The switch actuator is movable between a proximal position, in which the switch actuator actuates a switch, and a distal position. The latch is movable between a first position, in which the latch permits proximal movement of the switch actuator, and a second position, in which the latch prevents proximal movement of the switch actuator. The latch is configured to move from the first position toward the second position in response to the actuation bar moving toward a proximal position.

A surgical instrument can comprise a handle, a motor, and a shaft extending from the handle. The handle and/or the shaft can define a longitudinal axis. The surgical instrument can further comprise a fastener cartridge comprising a plurality of fasteners removably stored therein, an anvil configured to deform the fasteners, a closure drive configured to move the anvil toward and away from the fastener cartridge which is rotatable about the longitudinal axis, and a firing drive configured to deploy the fasteners from the fastener cartridge which is rotatable about the longitudinal axis. The surgical instrument can further comprise a transmission comprising a first operating configuration which connects the motor to the closure drive and a second operating configuration which connects the motor to the firing drive.

A surgical instrument can comprise a handle, a motor, and a shaft extending from the handle. The handle and/or the shaft can define a longitudinal axis. The surgical instrument can further comprise a fastener cartridge comprising a plurality of fasteners removably stored therein, an anvil configured to deform the fasteners, a closure drive configured to move the anvil toward and away from the fastener cartridge which is rotatable about the longitudinal axis, and a firing drive configured to deploy the fasteners from the fastener cartridge which is rotatable about the longitudinal axis. The surgical instrument can further comprise a transmission comprising a first operating configuration which connects the motor to the closure drive and a second operating configuration which connects the motor to the firing drive.

An apparatus includes a platform, an adjunct material, and an engagement feature. The platform includes an upper support and a lower support. The adjunct material is positioned on the upper support or the lower support. The upper support is configured to move relative to the lower support to apply the adjunct material to a jaw of an end effector incorporated into a surgical stapler. The engagement feature is configured to interact with a predetermined portion of the end effector to permit movement of the upper support relative to the lower support and thereby apply the adjunct material to the jaw of the end effector. The engagement feature is further configured to inhibit movement of the upper support relative to the lower support when the engagement feature is disengaged from the predetermined portion of the end effector.

An anvil buttress loading system includes an anvil assembly, an anvil buttress loading tool, and an anvil buttress. The anvil buttress is retainable on each of the anvil buttress loading tool and the anvil buttress, and is transferrable from the anvil buttress loading tool to the anvil assembly.

Compressible adjuncts for use with a surgical cartridge are provided. In one exemplary embodiment, a compressible adjunct includes a biocompatible adjunct material that is configured to be releasably retained on a staple cartridge and that is configured to be delivered to tissue by deployment of staples in the cartridge. The adjunct material includes a hollow lattice macrostructure having at least one drug contained therein. The hollow lattice macrostructure is formed of a plurality of unit cells having at least one absorbable sub-structure that is formed in the plurality of unit cells. The at least one absorbable sub-structure is configured to control a rate of fluid movement through the respective unit cell so as to control the release of the at least one drug from the adjunct material when the adjunct material is in a tissue deployed state. Stapling assemblies for use with a surgical stapler are also provided.

A shell assembly includes a shell housing defining a cavity, a plurality of staples, a staple cartridge supported on the shell housing, a pusher assembly positioned within the cavity of the shell housing, and a hydraulic piston configured to engage the pusher assembly to impart axial displacement to the pusher assembly and form a fluid tight seal against the shell housing. The staple cartridge defines slots that receive the plurality of staples. The pusher assembly includes a plurality of pushers arranged in an annular configuration to eject the plurality of staples from the staple cartridge. Supply of a fluid into the cavity of the shell housing advances the hydraulic piston, which, in turn, advances the pusher assembly to eject the plurality of staples from the staple cartridge.

A method of operating a surgical stapling instrument comprising a shifting mechanism is disclosed.