Advanced polyaxial locking screw and coupling element device for use with rod fixation apparatus

摘要: A polyaxial orthopedic device for use with rod implant apparatus includes a screw having curvate head and coupling element. The element has tapered lower portion including slotted interior chamber in which the is initially polyaxially disposed; recess formed its side receiving of apparatus; an exterior threading disposed on upper receving thereon top locking nut. ring about element, provides inward force outwardly upon downward translation thereof, thereby causing to crush lock therein, thus eliminating nature screw-element coupling. In addition, hollow cylindrical securing sleeve fits over locks first embodiment, nut seats against sleeve, ring, causes chamber. second bottom have threads so that may be translated separately screw.