Bi-directional fixating transvertebral body screws and posterior cervical and lumbar interarticulating joint calibrated stapling devices for spinal fusion

A tool assembly comprising:

• a universal, intervertebral bone fusion spacer for insertion into a disc space between a first vertebral body and a second vertebral body and fusion of the first vertebral body to the second vertebral body via biological bone fusion and screw fusion, the universal, intervertebral bone fusion spacer comprising:
• an intervertebral cage including a first integral screw guide and a second integral screw guide, wherein the intervertebral cage further includes a circular hole extending into the top surface of the top wall in a direction substantially normal to the top surface of the top wall;
• and
• a first screw disposed in the first integral screw guide and at least partially within the intervertebral cage;
• a second screw disposed in the second integral screw guide and at least partially within the intervertebral cage,
• wherein the first integral screw guide and the second integral screw guide are angled to orient the first screw and the second screw bi-directionally,
• wherein a surface of each longitudinal end of the intervertebral cage includes a slot or indentation formed adjacent to an edge of an upper surface of the intervertebral cage for receiving a distal end of a prong of an implantation tool;
• and
• a tool for manipulating and inserting the universal, intervertebral bone fusion spacer into the disc space between the first vertebral body and the second vertebral body to provide fusion of the first vertebral body to the second vertebral body via biological bone fusion and screw fusion, the tool comprising:
• a gripper having a plurality of prongs,
• wherein a distal end of each of the plurality of prongs engages a respective slot or indentation of the intervertebral cage;
• and
• a screw guide for controlling a direction of the first screw and the second screw that are inserted into the first integral screw guide and the second integral screw guide,
• wherein the screw guide is positioned between the plurality of prongs and the distal ends of the prongs extend past the screw guide such that the screw guide is positioned axially between the elongate shaft and the distal ends of the prongs.