POLYAXIAL VERTEBRAL FIXING SYSTEM

摘要

Insertion of the grooved (1.1) screw (1) in the vertebra (3) is performed in a broad conical space, which are held in a projection (2.1) of the tulip (2) that holds the lower end of the head (1.3) of the screw (1) in a spherical sector (1.4). The cup (4) is lodged in the tulip (2) and includes the longitudinal rod (5) with a fixing nut (6) and an outer nut (7) that prevents opening thereof. Transversal rods (8) maintain the position by means of a lower part (9) and a casing (10) with a sprocket wheel located opposite to another similar wheel of an upper casing (11) that lodges the transversal rod (8).