US Patent 10888309 Surgical fastener devices with geometric tubes

An end effector for a surgical fastening device includes a fastener and a tube defining a longitudinal axis. The tube includes an outer surface and an inner surface. The inner surface defines a lumen that extends along the longitudinal axis. The tube defines depressions that may be arranged helically about the tube along the longitudinal axis. The end effector may include one or more ribs extending along the tube.