Circular needle driver

A needle cartridge adapted to be attached to a receiver on a surgical suturing device comprises an arced needle having a leading end, a trailing end, and a length of suture. A body is provided having a pair of distally projecting arms and a track receiving the needle and defining a 0 circular path. A needle driver is operable to rotate the needle along the circular path across the body arms. A cover captures the needle in the track, the cover having a pair of distally projecting arms aligned with the body arms. A cage is slideable relative to the body between a distal position where the cage constrains the cover arms against the body arms to capture the needle in the track, and a proximal position where the cage disengages from the cover arms allowing the 5 needle to eject from the track.