Box cage for intervertebral body fusion
First Claim
Patent Images
1. An interbody implant for enhancing fussion of adjacent vertebral bodies comprising:
- (a) a cage member of generally rectangular cross-section having four mutually perpendicular sidewalls of predetermined height dimension allowing insertion between adjacent vertebral bodies, and with an opposed pair of said four sidewalls, each of said opposed pair of sidewalls including an aperture therethrough of a predetermined diameter; and
(b) a locking screw with threads of a predetermined pitch and a length allowing threaded insertion into said apertures, the locking screw having a root diameter less than said predetermined diameter and a crest diameter greater than the predetermined height dimension of the opposed pair of sidewalls and adapted to threadingly engage the adjacent vertebral bodies when the cage member is inserted between the adjacent bodies and the locking screw is threaded into the apertures in the opposed pair of sidewalls.
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Abstract
An interbody implant for enhancing fusion of adjacent vertebral bodies comprises a rectangular cage member of an open construction dimensioned to fit between adjacent vertebral bodies following surgical removal of the disk. The rectangular cage member includes a plurality of ribs for engaging the plateaus of adjacent vertebral bodies for preventing lateral shifting of the cage. It is held against anterior/posterior motion by a locking screw which threadedly engages the cage and adjacent bone tissue. The cage is adapted to be packed with bone graft material for enhancing solid bone fusion.
240 Citations
10 Claims
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1. An interbody implant for enhancing fussion of adjacent vertebral bodies comprising:
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(a) a cage member of generally rectangular cross-section having four mutually perpendicular sidewalls of predetermined height dimension allowing insertion between adjacent vertebral bodies, and with an opposed pair of said four sidewalls, each of said opposed pair of sidewalls including an aperture therethrough of a predetermined diameter; and (b) a locking screw with threads of a predetermined pitch and a length allowing threaded insertion into said apertures, the locking screw having a root diameter less than said predetermined diameter and a crest diameter greater than the predetermined height dimension of the opposed pair of sidewalls and adapted to threadingly engage the adjacent vertebral bodies when the cage member is inserted between the adjacent bodies and the locking screw is threaded into the apertures in the opposed pair of sidewalls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification