The wheel (16) is idle mounted in rotation about an axis inclined to the axis of the screw (10) which is rotatingly driven on itself about the axis thereof.

The rotation of the horizontal screw turns a gear about an axis perpendicular to the screw axis.

At least one of the arms has a portion that extends into a screw aperture such that an arm axis is generally parallel to the axis of the screw after the screw is received in the implant.

The agitator (80) is horizontally driven along an axis which is parallel to the axis of the feed screw (14) and is removable from the feeder.

The carriage (20) on which the support (18) is pivotingly mounted is free to move with a translating motion parallel to the axis of the screw (10) on a rail (22).

The first bone screw defines a first axis and the second bone screw defines a second axis.

The first bone screw and the second bone screw are securable to each other.

The first axis of the first bone screw and the second axis of the second bone screw define an angle therebetween.

A carriage sheave (30) mounted on a drive screw (34) is positioned adjacent the winch drum (18), wherein the drive screw (34) is rotatable about a second axis substantially parallel to the first axis.

resistance to axial withdrawal of screws

resistance to axial withdrawal of screws

A waterproof screw comprises a screw member further comprising a head part and an axle part, and a seal material which covers the circumference of the axle part.

The washer is configured to rotate (QQ) about an axis substantially normal to a longitudinal axis (A) of the bone screw.

The diameter of the screw is varied along its axis.

The driven worm (5) is resiliently displaceable along an axis (A) of said worm (5).