Patent ID: 7135043

Claim:
An intervertebral cage insertable between vertebrae of a spine comprising: a main body defined by a pair of upper and lower surfaces and a pair of side surfaces connected thereto; and a withdrawal prevention portion formed on the upper and/or the lower surfaces of the main body, wherein the withdrawal prevention portion regulates an insertion direction of the intervertebral cage, wherein the main body is formed in a hollow body and is made thicker on a rear side in the direction of insertion than on a front side, wherein the withdrawal prevention portion comprises a plurality of claw portions whose cutting lines are formed in a direction nearly perpendicular to a bisector line nearly bisecting an angle formed by a side surface and a front surface of the main body, and wherein a screw through hole is formed to pass through surfaces which form a V-shaped groove in a sectional side view in a rear end surface of the main body and are opposed to each other.