| 主权项 |
1. A polyaxial locking assembly comprising;
a bushing with a partially spherical outer surface sized and shaped to closely conform with a cavity in a receiving member, characterized in that the bushing further comprises a groove around a circumference of the bushing, said groove being shaped so that the bushing, at that circumference, provides a cam having at least one lobe; there is further provided an anti-rotation member having a substantially annular geometry and a radial thickness and being contoured such that at least one portion of the anti-rotation member has an effective radial thickness greater than that of at least one other portion such that in use, rotation of the bushing around an axis perpendicular to the plane of the groove causes the at least one lobe of the cam to engage with the at least one effectively radially thicker portion of the anti-rotation member, forcing the anti-rotation member to engage with the cavity so as to lock the assembly in a desired orientation. |
