Patent ID: 7691147

Claim:
An intervertebral implant insertable into an intervertebral disc space between adjacent upper and lower vertebral bodies, the implant having a central axis and comprising: a lower implant part having an apposition surface intended to rest against the adjacent lower vertebral body, the lower implant part including a hollow-cylinder cavity defining an inner surface, the lower implant part having at least one guide slot formed in the inner surface; an upper implant part having an essentially circular-cylindrical shaft including a bore with an inside thread and an apposition surface intended to rest against the adjacent upper vertebral body, the shaft including at least one wedge extending therefrom, the at least one wedge being parallel to the central axis, the bore passing axially through the shaft, parallel to the central axis, the at least one wedge being axially received within the at least one guide slot so that said lower and upper implant parts are secured relative to one another, to prevent rotation about the central axis, wherein the circular-cylindrical shaft has a circumference that is spaced apart from the inner surface of the cavity so that the upper implant part and the lower implant part only contact one another via the at least one wedge contacting the at least one guide slot; and a threaded spindle, insertable into the bore formed in said upper implant part and connected with said lower implant part, the threaded spindle having an outside thread that interacts with said inside thread and a gear crown that is concentric to the central axis, wherein: said lower and upper implant parts and said threaded spindle are disposed to be coaxial along the central axis; and the distance between said two apposition parts can be changed in a stepless manner by rotating said threaded spindle, said threaded spindle being fixed in place on said lower implant part so as to be fixed axially but movable rotationally, by means of a clip connection.