Patent ID: 8216281
Filing Date: 2012-07-10
Classification: A61B

Abstract:
1. A dynamic spine stabilization device comprising: a bone screw having a longitudinal axis, a proximal end and a distal end; the distal end of the bone screw being adapted to engage a vertebra; the proximal end of the bone screw comprising a housing; a longitudinal bore in the housing aligned with the longitudinal axis of the bone screw, the bore having an open end and a closed end and the closed end of the bore terminating in a hemispherical pocket; an elongated deflectable post; a ball-shaped retainer at a first end of the deflectable post, wherein the deflectable post is received in the longitudinal bore such that the ball-shaped retainer is positioned within the hemispherical pocket and a second end of the deflectable post extends through the open end of the longitudinal bore; a cap secured to the housing; the cap having a cap bore therethrough that receives the deflectable post; the cap bore comprising a limit surface arranged at a first angle relative to the longitudinal axis of the bone screw and positioned to contact the deflectable post over an area when the deflectable post pivots through said first angle from alignment with the longitudinal axis of the bone screw; and the cap having a flange to secure the ball-shaped retainer of the deflectable post in the hemispherical pocket of the housing such that the ball may pivot and rotate within the hemispherical pocket.