An adjustable vertebral body replacement implant and assembly includes a thin-walled cylindrical body configured to span over most of the length between intact vertebrae when damaged or diseased vertebrae have been removed. The cylindrical body defines a hollow interior and includes endplates with end surfaces configured to contact the adjacent vertebra and to engage the cylindrical body therebetween. Said end surface includes a blade or plurality of blades configured to penetrate the adjacent vertebra and to facilitate insertion and removal of the implant. This end surface also defines a bore through said endplate. In one embodiment, an end cap which includes a porous body such as porous tantalum manufactured under the name HEDROCEL.RTM. is placed in said bore. The end cap provides strength to carry the vertebral loading while allowing vascularization between the intact vertebral and bone growth material disposed within the implant. In another embodiment, the end cap includes an anchor embedded in the bone growth material. The end cap may also include a positioning surface to align the end cap within the bore.
The present application is a continuation-in-part of U.S. patent application Ser. No. 08/814,115 filed Mar. 10, 1997, now U.S. Pat. No. 5,776,198; which is a continuation of U.S. patent application Ser. No. 08/647,272 filed May 13, 1996, now U.S. Pat. No. 5,702,453; which is a continuation of U.S. patent application Ser. No. 08/343,566 filed Nov. 22, 1994, now U.S. Pat. No. 5,453,454.
A prosthesis in the form of a cage having opposed complimentary bearing surface assemblies. The bearing surface assemblies moveable towards and away from each other. The moving mechanism being part of the bearing surface assemblies. Each of the bearing surface assemblies having an outer bearing surface whereby movement of one bearing surface assembly in one direction will move the bearing surface assemblies away from each other and movement in the opposite direction will move the bearing surface assemblies towards each other.
The present invention relates to an osseous anchoring device intended to maintain a prosthesis or an implant in position, and in particular an anchoring device for an intervertebral prosthesis. The anchoring device for a prosthesis (1), or an implant, is intended to be anchored in a prepared osseous surface (310, 321). It comprises at least one protruding element extending beyond the prosthesis, this protruding element being able to be positioned relative to the prosthesis in a plurality of positions thus making it possible to choose a position adapted to the case to be treated or to the chosen mode of inserting the prosthesis or the anchoring device.
An apparatus and method for cutting spinal implants to a desired length is disclosed. The spinal implant is supported on a mandrel that rotates while a cutting blade cuts the spinal implant. The apparatus and method accurately size and cut spinal implants to the desired length.
An implant cap is disclosed for preventing the over-expansion of an expandable spinal implant and method for use therewith. An implant cap also is disclosed for moving an expandable spinal implant from a collapsed position to an expanded position with less than one full turn of the implant cap and a method for use therewith. A screw lock is disclosed for locking a bone screw to the trailing end of an expandable spinal implant and a method for use therewith.
An implant cap is disclosed for preventing the over-expansion of an expandable spinal implant and method for use therewith. An implant cap also is disclosed for moving an expandable spinal implant from a collapsed position to an expanded position with less than one full turn of the implant cap and a method for use therewith. A screw lock is disclosed for locking a bone screw to the trailing end of an expandable spinal implant and a method for use therewith.
