Patent Issued for Knife Lockout Mechanisms for Surgical Instrument

News editors obtained the following quote from the background information supplied by the inventors: "This present disclosure relates to a surgical instrument having jaws that are movable between open and closed positions, and more particularly to a surgical instrument having a knife bar."Surgical devices wherein tissue is first grasped or clamped between opposing jaw structure and then joined by surgical fasteners are well known in the art. In some instruments, a knife is provided to cut the tissue which has been joined by the fasteners. The fasteners are typically in the form of surgical staples but two part polymeric fasteners can also be utilized.
"Instruments for this purpose may include two elongated members which are respectively used to capture or clamp tissue. Typically, one of the members carries a staple cartridge that houses a plurality of staples arranged in at least two lateral rows while the other member has an anvil that defines a surface for forming the staple legs as the staples are driven from the staple cartridge. The stapling operation is effected by cam bars that travel longitudinally through the staple cartridge, with the cam bars acting upon staple pushers to sequentially eject the staples from the staple cartridge."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "The present disclosure relates to a cartridge assembly for use with a surgical stapling instrument. The cartridge assembly includes a channel, a cover, a staple cartridge and a knife. The channel includes a protrusion thereon. The cover is configured for mechanical engagement with the channel and includes a blocking member and a surface defining a plane. At least a portion of the blocking member is configured to move away from the plane upon contact with the protrusion. The staple cartridge is configured for mechanical engagement with the cover. The blocking member is configured to substantially prevent distal translation of the knife after the knife has been translated proximally past a predetermined position.
"The present disclosure also relates to a surgical stapling instrument including a frame, an elongate portion extending distally from the frame and defining a longitudinal axis, and a cartridge assembly. The cartridge assembly is disposed in mechanical cooperation with the elongate portion and includes a surface defining a plane, a protrusion, a blocking member and a knife. At least a portion of the blocking member is configured to move away from the plane upon engagement with the protrusion. The knife is configured for translation with respect to the surface. The blocking member is configured to substantially prevent distal translation of the knife after the knife has been translated proximally past a predetermined position."