Patent ID: 8784493

Claim:
An intervertebral cage used for being implanted into a location between two adjacent vertebral bodies, wherein the intervertebral cage comprises: a body having a lateral convex surface, a lateral concave surface, an inclined surface, a connecting surface and a fillet located between the inclined surface and the lateral convex surface, wherein the lateral convex surface, the inclined surface, the lateral concave surface and the connecting surface are connected sequentially; and at least one connecting portion comprising a main portion and a first protrusion, wherein the main portion is connected to the connecting surface of the body and has at least one through hole, the first protrusion is protruded from the main portion into the through hole in a direction towards the connecting surface so as to form a first inner arc surface and a second inner arc surface and a first angle contained between the inclined surface and a line segment connecting the circle center of the fillet to the circle center of the first inner arc surface ranges 0˜89 degrees; wherein the maximum width of the intervertebral cage is a distance between a first line and a second line, the first line is substantially parallel to a tangent line of the lateral convex surface, the second line is substantially parallel to the first line, and the distance between the inclined surface and the first line decreases gradually along a direction away from the connecting portion.