Abstract: An apparatus for fixing a cervical spine having a self tension part used in orthopedic surgery or neurosurgery when executing an anterior fixation operation on cervical spines is disclosed, including: an extension groove formed through a plate between the insertion holes and the center of the plate; a channel groove formed with stepped surfaces at both sides at the boundary of the insertion holes and the extension groove; a guide that is connected to the channel groove, rotates left/rightward in the channel groove and locks the screw to be inserted into the insertion holes; and a tension part that gives a pushing force the guide to be pushed toward the center of the plate and allows the guide to be rotated in the channel groove.

Abstract: An expandable interfusion cage comprising a cage body and a spacer. The cage body includes a seat part which is pierced by an orifice and a branch part which defines therein an inside space and has a plurality of elongate branches integrally formed at their proximal ends with the seat part. An opening is defined between two adjoining branches to communicate with the inside space. The spacer is movably assembled in the inside space of the cage body to expand the cage body radially outward. Inward projections are formed at distal ends, respectively, of the branches to project radially inward toward an axis of the cage body. The inside space of the cage body has substantially a circular or polygonal sectional shape. The spacer is engaged with the inward projections of the branches while expanding the cage body.

Abstract: An expandable interfusion cage comprising a cage body and a spacer. The cage body includes a seat part which is pierced by an orifice and a branch part which defines therein an inside space and has a plurality of elongate branches integrally formed at their proximal ends with the seat part. An opening is defined between two adjoining branches to communicate with the inside space. The spacer is movably assembled in the inside space of the cage body to expand the cage body radially outward. Inward projections are formed at distal ends, respectively, of the branches to project radially inward toward an axis of the cage body. The inside space of the cage body has substantially a circular or polygonal sectional shape. The spacer is engaged with the inward projections of the branches while expanding the cage body.