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

A zero-profile, intervertebral cage sized and configured to be inserted into a disc space between adjacent vertebral bodies and to provide fusion of the adjacent vertebral bodies via biological bone fusion and screw fusion,

• the intervertebral cage comprising:
• a top wall;
• a bottom wall opposite the top wall;
• a first sidewall;
• a second sidewall opposite the first sidewall, each of the first sidewall and the second sidewall having a surface configured to contact one of the adjacent vertebral bodies when the intervertebral cage is inserted into the disc space,
• wherein at least the first sidewall and the second sidewall bound an open space capable of receiving bone filling for the biological bone fusion,
• wherein the top wall includes a top surface and a bottom surface opposite the top surface, the top surface configured to have a zero-profile with respect to the adjacent vertebral bodies when the intervertebral cage is inserted into the disc space, and the bottom surface facing the open space;
• and
• an internal screw trajectory guide for guiding a trajectory of a screw through the intervertebral cage, the internal screw trajectory guide having an internal bore with an entry opening and an exit opening, the internal bore of the entry opening formed only in the top surface of the top wall, and the internal bore of the exit opening formed at least partially in a bottom surface of the top wall and at least partially in a side surface of the top wall.

A universal, intervertebral combination internal screw guide and fixation apparatus configured to be inserted into a disc space between a first vertebral body and a second vertebral body and to provide fusion of the first vertebral body to the second vertebral body via biological bone fusion and screw fusion, the apparatus comprising:

• an intervertebral cage including:
• a top wall, a bottom wall, and two sidewalls defining an open space capable of receiving bone filling for the biological bone fusion;
• and
• an internal screw guide having an internal bore with an entry opening and an exit opening, the entry opening of the internal bore formed only in a top surface of the top wall,
• the exit opening of the internal bore formed at least partially in a bottom surface of the top wall, and the exit opening of the internal bore formed at least partially in at least one of:
• a side surface of the top wall;
• and
• a surface of one of the two sidewalls.