Vertebral body prosthesis
First Claim
1. A vertebral body prosthesis comprising:
- a. an upper plate having a depending ball supporting member comprising a truncated cone member projecting downwardly from said plate and having a narrower end lower than a wider end, with said lower end terminating in a depending ball portion;
b. a lower plate having an upstanding hemispherical socket supporting member having an upper end connected to a hemispherical socket, with said ball seated in said socket; and
c. a resilient toroidal disc interposed between said upper plate and said lower plate.
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Abstract
An upper plate includes a depending truncated cone member that supports a ball. A lower plate supports an upstanding truncated cone member that supports a cup socket that the ball is press fitted into. The cup socket embraces the ball to a line above the middle diameter of the ball to prevent the ball from coming free of the socket in normal use. A number of wires form a repeating X pattern between the upper and lower plates about their perimeters and serve to restrain rotational motion. The upper plate includes upwardly projecting spikes and the lower plate includes downwardly projecting spikes. The upper and lower plates each include two anchoring brackets that project outwardly to lie adjacent to an upper and lower spinal disc, and that are fastened to the discs by bone screws. The spikes further anchor the vertebral body prosthesis in the adjacent spinal discs.
914 Citations
12 Claims
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1. A vertebral body prosthesis comprising:
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a. an upper plate having a depending ball supporting member comprising a truncated cone member projecting downwardly from said plate and having a narrower end lower than a wider end, with said lower end terminating in a depending ball portion; b. a lower plate having an upstanding hemispherical socket supporting member having an upper end connected to a hemispherical socket, with said ball seated in said socket; and c. a resilient toroidal disc interposed between said upper plate and said lower plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vertebral body prosthesis comprising:
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a. an upper plate having a depending ball supporting member comprising a truncated cone member projecting downwardly from said plate and having a narrower end lower than a wider end, with said lower end terminating in a depending spherical ball portion; b. a lower plate having an upstanding hemispherical socket supporting member comprising a truncated cone having a narrower end and a wider end, with said wider end connected to said lower plate, said socket supporting member having an upper end connected to a hemispherical socket, with said ball seated in said socket; and c. a toroidal disc interposed between said upper plate and said lower plate; and d. a plurality of wires arrayed in a repeating X pattern, each said wire having one end connected to said upper plate and a second end connected to said lower plate. - View Dependent Claims (10, 11, 12)
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Specification