Implant having enhanced initial fixation force
The present invention provides an implant having an enhanced initial fixation force, and more particularly, to an implant that may maintain a fixed state without relative movement with respect to vertebral bodies until fusion is completely performed. The implant includes: an implant body inserted between vertebral bodies; and an injection unit installed in the implant body, and configured to inject bone cement into the vertebral bodies.
1. An implant comprising:
an implant body having a longitudinal axis and configured to be inserted between vertebral bodies, the implant body having an upper surface and a lower surface;
an injection unit installed in the implant body, and configured to inject bone cement into the vertebral bodies; and
a plurality of screw seats, formed in the upper surface or the lower surface,
wherein the injection unit comprises a bone screw mounted through a hole in a plate attached to the implant, the bone screw received in each of the plurality of screw seats,
wherein the bone screw comprises an injection port formed in a head thereof and outlet ports formed in a threaded part thereof in communication with the injection port,
wherein the outlet ports have cross-sectional areas decreasing toward a distal part of the implant body, the distal part being a region where an insertion thereof into the vertebral bodies is started,
wherein each of the outlet ports is defined by an interior wall that is angled or tapered along a length of each of the outlet ports measured through the injection unit toward the longitudinal axis, and
wherein the plurality of screw seats secure the bone screw and are configured to prevent the implant body from interfering with the bone screw when the bone screw is inserted into the vertebral bodies.
2. The implant according to claim 1 , wherein the plate is fixed to the implant body by a plate fixing screw.
3. The implant according to claim 1 , wherein the implant body has a plurality of screw seats formed in the upper surface.
4. The implant according to claim 1 , wherein the implant body has a plurality of screw seats formed in the lower surface.