A surgical stapling apparatus comprising: a body part (104) defining a longitudinal axis having a proximal limb and a distal limb； a tool assembly (106) supported on the distal end of the body part (104), including the tool assembly (106) an anvil assembly (114) and a cartridge assembly (116) having a body (138 ) of a cartridge that defines a distal end and a proximal end, the tool assembly (106) being movable from a position not approximated to an approximate position, a drive member (130) movably supported within the assembly (106) of tools from a retracted position to an advanced position to move the tool assembly (106) from the position not approximated to the approximate position, the drive member (130) having a base (130a) and a distal stop surface (222) to said base (130a)； a trigger lock assembly (200) including a retention member (242) having a blocking member (244a) and a solicitation member (260), the retention member (242) being pivotally supported within the tool assembly (106) and being movable from a first position to a second position, in which in the first position the lock member (244a) of the retention member (242) is aligned with the stop surface (222) of the drive member (130) to prevent the drive member (130) from advancing inside the tool assembly (106) and in the second position the locking member (244a) is misaligned from the abutment surface (222) of the drive (130) to allow the drive member (130) to advance into the tool assembly (106), the solicitation member (260) being positioned to push the retaining member (242) into the first position； and an activation sled (148) positioned within the tool assembly (106) to be applied by the drive member (130) when the drive member (130) is moved from the retracted position to the advanced position, making the member of drive (130) the movement of the activation sled (148) from a retracted position to an advanced position after the movement of the drive member (130) from the retracted position to th
