Polyaxial pedicle screw having a compression locking rod gripping mechanism

摘要: A polyaxial orthopedic device for use with rod implant apparatus includes a screw having curvate ball top, head member socket into which the of is initially polyaxially nested, vertical slot renders compressible, and horizontal through hole tapered portion on one side slot. gripping cross-bar member, mounted an axial split permits first end thereof to grip rod, then be clamped onto when narrowed. nut provided extend out from opposite mechanism. The advancement causes compressed by taper front hole, thereby locking in thereof, further provides compression force necessary lock interior against top screw.