The weight bearing top and bottom surfaces or faces are roughened preferably serrated, to provide teeth for biting into the vertebrae. Local bone graft harvested from the channel cuts into the vertebrae to receive the plug supplements the fusion.
The spinal fusion implant of claim 43, further comprising a plurality of cells in said body for retaining said fusion promoting substance. Field of the Invention The present invention relates to artificial spinal fusion implants to be placed across the intervertebral space left after the removal of a damaged spinal disc, and in particular to an improved, at least partially cylindrical, spinal fusion implant for implantation where two threaded cylindrical implants of requisite height would not fit within the transverse width of the spine.
Therefore, many spinal pains can be reduced or eliminated by fusing the adjacent vertebrae on either side of the injured disc. If this happens the fixation is lost. The lower component includes an upwardly extending posterior protrusion which fits into and slides in a corresponding recess of the upper component.
The height of the plugs is greater Spinal prothesis brantigan cages the width. There are various radiolucent cages now carbon fiber or PEEK which allow postoperative visualization of the bone graft healing, but do not provide as good fixation.
In the preferred embodiment, the implant of the present invention relies on surface roughenings of the outer surface to enhance its stability and resist dislodgement from within the disc space Spinal prothesis brantigan cages two adjacent vertebrae. The spinal fusion implant of claim 1, wherein said opposed rigid portions have a porous surface.
Further, the Ray implant is unduly complex, because it would require the difficult, if not impossible, task of assembly within the disc space. The spinal fusion implant of the present invention relies on roughenings of the outer surface to enhance its stability. Viche taught the threading of that bone dowel.
The internally threaded section 37 engages external threads 31 of fitting 30 during use.
The channels 15 can be formed by a mortise cutting chisel tool and in the event disc tissue 12a blocks the paths for the plugs 11, tissue can be trimmed or spread apart to open up the paths. The presence or absence of holes does not materially affect this, so far as the holes are filled with material effectively contributing to the area of contact at the surface.
In the treatment described within the realm of this invention, the procedure with our invention can restore all of the normal functions except motion. The spinal fusion implant of claim 64, wherein said implant has a height greater than the disc space between the two adjacent vertebral bodies to be fused.
This provides surfaces which will not tear or mangle the delicate nerves and blood vessels near the site of the spinal cord. The spinal fusion implant of claim 64, further comprising a plurality of cells in said body for retaining said fusion promoting substance.
The spinal fusion implant of claim 64, wherein said fusion promoting substance is contained within said implant. The spinal fusion implant of claim 1, wherein said implant is coated with said fusion promoting substance.
It is also possible that the cages would impinge on a nerve root, but this is uncommon. These teeth have sharp peaks 19a with slopping side walls 19b diverging to the surfaces 11 and providing valleys 19c between the peaks. The lumbar spine 3rd ed. The T-wrench inserter 35 may then be coupled to the anterior fitting 30 on the cage body Bagby taught the placing of the bone graft into a metal bucket otherwise smooth on its surface, except for rows of radially placed holes communicative to the interior of the basket and to the bone graft.
A thinner wall is easier for bone to grow through.
The spinal fusion implant of claim 43, wherein said implant is treated with said fusion promoting substance. Fogel, MD, John S. The beveled leading end of the plug facilitates insertion of the plug in proper position into the receiving channels or grooves of the vertebrae.
Cloward taught placing a dowel of bone within that drilled hole for the purpose of bridging the defect and to be incorporated into the fusion.
Together, two vertebrae with a disc and associated ligaments are called a vertebral motion segment. Thus, the implant of the present invention may be thinner walled and thereby, for a given diameter, have greater internal volume.
The Brantigan cages are of a type which this invention improves by providing an arcuate exterior surface and with adequate space bone graft material. Further, the spinal fusion implant of the present invention does not require rotation for its insertion and can be seated by linear advancement.
The apparatus of claim 10 further comprising bore means for receiving bone fusion augmenting material. Additionally, the Michelson device may then be coated with a bone production inducing chemical such as hydroxyapatite.
What is claimed as invention is: Cloward taught placing a dowel of bone within that drilled hole for the purpose of bridging the defect and to be incorporated into the fusion.Read "Animal models for spinal fusion, The Spine Journal" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Spinal Prothesis Brantigan Cages. Interbody fusion cage – Wikipedia is a prosthesis used in spinal fusion procedures to maintain foraminal Pyramesh cage, InterFix cage, and lordotic LT cage, all of which are made from titanium.
Sep 26, · Prosthetic implant for intervertebral spinal fusion: June, Brantigan: / Anterior interbody fusion device Surgically implanting threaded fusion cages between adjacent low-back vertebrae by an anterior approach while the spinal fusion implants 14a and 14b will not protrude from the sides of the spinal.
Jul 06, · U.S. Pat. No. 4, issued to Brantigan on May 30,teaches a rectangular shaped, hollow spinal fusion implant for use in lieu of a rectangular bone graft or Brantigan's earlier artificial inert spacer. Animal models for spinal fusion are essential for preclinical testing of new fusion methods and adjuncts.
They allow for control of individual variables and. A61F2/ — Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g.
intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g.
having a rectangular or trapezoidal cross-section.Download