Patent ID: 8231635
Filing Date: 2012-07-31
Classification: A61B

Abstract:
1. A polyaxial screwdriver comprising: a handle; a shaft having a first end attached to the handle and a screw engaging end; a cylindrical portion formed at the screw engaging end, the cylindrical portion having a first surface and a second surface alternatingly arranged at a periphery portion, the first surface and the second surface being adapted to engage a head of a polyaxial screw shaped to receive the screw engaging end; and a sleeve being slidable over the shaft, the sleeve having a collet adapted to engage a tulip of the polyaxial screw; a locking button mounted on the sleeve, the locking button being capable of automatically locking the shaft and thereby preventing the shaft from disengaging from the head of the polyaxial screw; at least one projection formed on the collet, the projection being capable of engaging a depression on the surface of the tulip; a nut mounted on the shaft, the nut having internal threads; and external threads formed on the sleeve at the end that is close to the handle, the external threads being capable of engaging the internal threads.