A cartridge assembly (600) for use with a surgical stapling instrument (100), the cartridge assembly comprising: a channel (610) that includes a protuberance (612) thereon； a cover (620) configured for mechanical application with the channel, the cover including a locking member (622) and including a surface (624) defining a plane； a staple cartridge (630) configured for mechanical application with the cover； a blade (640) configured for translation with respect to the cover and the staple cartridge； characterized in that: the application between the channel (610) and the cover (620) causes the protuberance (612) to move at least a portion of the blocking member (622) from a first position in which the blocking member is substantially parallel with the plane of the surface of the cover to a second position in which at least a portion of the locking member is separated from the plane of the surface, where in the second position the cartridge assembly is configured to allow proximal translation of the blade beyond a predetermined position and the locking member (622) is configured to prevent distal translation of the blade after the blade has been proximally moved beyond the predetermined position.Un conjunto (600) de cartucho para utilizar con un instrumento (100) de grapado quirúrgico, comprendiendo el conjunto de cartucho: un canal (610) que incluye una protuberancia (612) en él； una cubierta (620) configurada para aplicación mecánica con el canal, incluyendo la cubierta un miembro de bloqueo (622) e incluyendo una superficie (624) que define un plano； un cartucho (630) de grapas configurado para aplicación mecánica con la cubierta； una cuchilla (640) configurada para traslación con respecto a la cubierta y al cartucho de grapas； caracterizado por que: la aplicación entre el canal (610) y la cubierta (620) hace que la protuberancia (612) mueva al menos una porción del miembro de bloqueo (622) desde una primera posición en la que el miembro de bloqueo es sustancialm
