Anterior spinal implant system for vertebral body prosthesis
First Claim
1. A vertebral body prosthesis for installation intermediate the inferior endplate of an upper vertebra and the superior endplate of a lower vertebra to replace a removed vertebra, said vertebral body prosthesis comprising:
- a vertebrae support member having an upper end and a lower end, said upper end of said vertebrae support member being arranged and configured for placement adjacent to the inferior endplate of the upper vertebra, said lower end of said vertebrae support member being arranged and configured for placement adjacent to the superior endplate of the lower vertebra, said vertebrae support member having a channel located therein which channel is open at said upper and lower ends of said vertebrae support member;
an upper mounting plate mechanically connected to said upper end of said vertebrae support member at a side thereof, said upper mounting plate extending upwardly from said upper end of said vertebrae support member, said upper mounting plate having a horizontally concave contour to lie close adjacent to a side of the upper vertebra when said upper end of said vertebrae support member is located close adjacent to the inferior endplate of the upper vertebra, said upper mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the upper vertebra at a converging relative angle to each other to secure said upper end of said vertebrae support member in a fixed position with respect to the upper vertebra; and
a lower mounting plate mechanically connected to said lower end of said vertebrae support member at a side thereof, said lower mounting plate extending downwardly from said lower end of said vertebrae support member, said lower mounting plate having a horizontally concave contour to lie close adjacent to a side of the lower vertebra when said lower end of said vertebrae support member is located close adjacent to the superior endplate of the lower vertebra, said lower mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the lower vertebra at a converging relative angle to each other to secure said lower end of said vertebrae support member in a fixed position with respect to the lower vertebra.
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Accused Products
Abstract
A vertebral body prosthesis is disclosed which is easily implantable intermediate the endplates of upper and lower vertebrae to replace the removed vertebral body and restore stability and normal vertebrae spacing to the spinal column while facilitating the occurrence of bony integration to fuse the aforesaid vertebrae together. A first embodiment, which may be used in the cervical spine and installed from an anterior surgical approach, is a vertebral body T-cage, which is fixed in height, and is for installation intermediate the endplates of two vertebrae located immediately above and below a removed vertebra. A second embodiment, which may be installed using a posterior surgical approach, is a fixed height vertebral body prosthesis for installation intermediate the endplates of vertebrae located immediately above and below a removed vertebra, with the device being affixed using curved mounting plates located on either the left or the right lateral side of the vertebrae. A third embodiment is a variable height vertebral body prosthesis similar to the fixed height vertebral body prosthesis, but which may be adjusted in height once it is installed in place to adjust the spacing between the vertebrae.
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Citations
23 Claims
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1. A vertebral body prosthesis for installation intermediate the inferior endplate of an upper vertebra and the superior endplate of a lower vertebra to replace a removed vertebra, said vertebral body prosthesis comprising:
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a vertebrae support member having an upper end and a lower end, said upper end of said vertebrae support member being arranged and configured for placement adjacent to the inferior endplate of the upper vertebra, said lower end of said vertebrae support member being arranged and configured for placement adjacent to the superior endplate of the lower vertebra, said vertebrae support member having a channel located therein which channel is open at said upper and lower ends of said vertebrae support member; an upper mounting plate mechanically connected to said upper end of said vertebrae support member at a side thereof, said upper mounting plate extending upwardly from said upper end of said vertebrae support member, said upper mounting plate having a horizontally concave contour to lie close adjacent to a side of the upper vertebra when said upper end of said vertebrae support member is located close adjacent to the inferior endplate of the upper vertebra, said upper mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the upper vertebra at a converging relative angle to each other to secure said upper end of said vertebrae support member in a fixed position with respect to the upper vertebra; and a lower mounting plate mechanically connected to said lower end of said vertebrae support member at a side thereof, said lower mounting plate extending downwardly from said lower end of said vertebrae support member, said lower mounting plate having a horizontally concave contour to lie close adjacent to a side of the lower vertebra when said lower end of said vertebrae support member is located close adjacent to the superior endplate of the lower vertebra, said lower mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the lower vertebra at a converging relative angle to each other to secure said lower end of said vertebrae support member in a fixed position with respect to the lower vertebra. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A vertebral body prosthesis for installation intermediate the inferior endplate of an upper vertebra and the superior endplate of a lower vertebra to replace a removed vertebra, said vertebral body prosthesis comprising:
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a vertebrae support column having an upper standard threaded end and a lower reverse threaded end thereof, said vertebrae support column having a channel located therein which channel is open at said upper and lower ends of said vertebrae support column; an upper base member for installation onto said upper standard threaded end of said vertebrae support column, said upper base member having a standard threaded aperture extending therethrough which aperture is in communication with said channel in said vertebrae support column, said upper base member being arranged and configured for placement adjacent to the inferior endplate of the upper vertebra; an upper mounting plate mechanically connected to said upper base member at a side thereof, said upper mounting plate extending upwardly from said upper base member, said upper mounting plate having a horizontally concave contour to lie close adjacent to a side of the upper vertebra when said upper base member is located close adjacent to the inferior endplate of the upper vertebra, said upper mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the upper vertebra at a converging relative angle to each other to secure said upper end of said vertebrae support member in a fixed position with respect to the upper vertebra; a lower base member for installation onto said lower reverse threaded end of said vertebrae support column, said lower base member having a reverse threaded aperture extending therethrough which aperture is in communication with said channel in said vertebrae support column, said lower base member being arranged and configured for placement adjacent to the superior endplate of the lower vertebra; and a lower mounting plate mechanically connected to said lower base member at a side thereof, said lower mounting plate extending downwardly from said lower base member, said lower mounting plate having a horizontally concave contour to lie close adjacent to a side of the lower vertebra when said lower base member is located close adjacent to the superior endplate of the lower vertebra, said lower mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the lower vertebra at a converging relative angle to each other to secure said lower end of said vertebrae support member in a fixed position with respect to the lower vertebra.
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22. A vertebral body prosthesis for installation intermediate the inferior endplate of an upper vertebra and the superior endplate of a lower vertebra to replace a removed vertebra, said vertebral body prosthesis comprising:
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a vertebrae support member having an upper end and a lower end, said upper end of said vertebrae support member being arranged and configured for placement adjacent the inferior endplate of the upper vertebra, said lower end of said vertebrae support member being arranged and configured for placement adjacent the superior endplate of the lower vertebra, said vertebrae support member being hollow intermediate said upper and lower ends thereof; an upwardly extending upper mounting plate mechanically connected to said upper end of said vertebrae support member at a side thereof, said upper mounting plate having a horizontally concave contour, said upper mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the upper vertebra at a converging relative angle to each other; and a downwardly extending lower mounting plate mechanically connected to said lower end of said vertebrae support member at a side thereof, said lower mounting plate having a horizontally concave contour, said lower mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the upper vertebra at a converging relative angle to each other.
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23. A method of making a vertebral body prosthesis for installation intermediate the inferior endplate of an upper vertebra and the superior endplate of a lower vertebra to replace a removed vertebra, said method comprising:
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providing a vertebrae support member having an upper end and a lower end, said upper end of said vertebrae support member being arranged and configured for placement adjacent to the inferior endplate of the upper vertebra, said lower end of said vertebrae support member being arranged and configured for placement adjacent to the superior endplate of the lower vertebra; defining a channel in said vertebrae support member, said channel being open at said upper and lower ends of said vertebrae support member; mechanically connecting an upper mounting plate to said upper end of said vertebrae support member at a side thereof, said upper mounting plate extending upwardly from said upper end of said vertebrae support member, said upper mounting plate having a horizontally concave contour to lie close adjacent to a side of the upper vertebra when said upper end of said vertebrae support member is located close adjacent to the inferior endplate of the upper vertebra, said upper mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the upper vertebra at a converging relative angle to each other to secure said upper end of said vertebrae support member in a fixed position with respect to the upper vertebra; and mechanically connecting a lower mounting plate to said lower end of said vertebrae support member at a side thereof, said lower mounting plate extending downwardly from said lower end of said vertebrae support member, said lower mounting plate having a horizontally concave contour to lie close adjacent to a side of the lower vertebra when said lower end of said vertebrae support member is located close adjacent to the superior endplate of the lower vertebra, said lower mounting plate having a plurality of angularly spaced-apart mounting apertures located therein such that screws inserted therethrough will extend into the side of the lower vertebra at a converging relative angle to each other to secure said lower end of said vertebrae support member in a fixed position with respect to the lower vertebra.
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Specification