supply of poly axial screw for occipito-cervico-thoracic spinal fixation system., ( sr ph code 544565 ) poly axial screw for occipito-cervico-thoracic spinal fixation system.used for occipito cervico thoracic spinal fixation and stabilisation in spine trauma, degenerative and tumor surgeries. should be multiaxial self tapping in nature with distraction and compression ability. diameter of screws should be available in 3.5mm to 4.5mm with length from 10-32mm in 2mm increments. should have atleast 30 degree angulation in all directions and atleast 45 degree increased angulation at 3 relief notches. should have buttress thread set screw for locking . should be compatible with 3.2 / 3.5mm titanium or cobalt chrome rods . should be compatible with torque limiting screw driver for final tightening. system should be registered with drug controller general of india. system should be iso or bis or fda or ce approved . unit:no