Abstract: Systems and methods of operating a tower extender in conjunction with a bone anchor housing can comprise positioning a plurality of deflectable members of a distal end of the tower extender proximate the bone anchor housing, pushing the distal end of the tower extender into engagement with the bone anchor housing to flex the plurality of deflectable members around the bone anchor housing to attach the tower extender relative to the bone anchor housing, rotating a knob to lock the plurality of deflectable members from deflecting away from the bone anchor housing, performing a portion of a surgical procedure with the tower extender, rotating the knob to deflect the plurality of deflectable members away from the bone anchor housing and puling the tower extender away from the bone anchor housing.

Abstract: A reducer comprises a reducing shaft for engaging a stabilization member, a reducer body for engaging a pedicle screw extender and receiving the reducing shaft along an axis, and one or more of a three-pawl clutch mechanism, a three-stage locking mechanism and a closure mechanism. The clutch mechanism comprises a clutch housing comprising a central passage into which the reducing shaft extends and ports intersecting the central passage, a clutch knob surrounding the clutch housing, and clutch pawls disposed within the ports. The locking mechanism attaches the reducer body to the pedicle screw extender and comprises a first pivoting lever comprising a toothed end, a second pivoting lever comprising a socket for engaging the tooth, and a protrusion configured to engage the pedicle screw extender. The closure mechanism comprises a driver shaft extending through the reducing shaft and a biasing element to bias the driver shaft to a retracted position.