MATERIAL COMBINATIONS FOR A PEDICLE SCREW ASSEMBLY

摘要

The present application is directed to embodiments of a pedicle screw assembly (10) to position an elongated member (60) within a patient. The assembly may include a receiver (20) with a channel (24) sized to receive the elongated member and a chamber (23). The assembly may also include an anchor (50) with a head (51) sized to fit within the chamber. The assembly may include a compression member (40) sized to fit within the chamber and include a first side (41) that contacts against the head and a second side (42) that contacts against the receiver. At least one of the receiver, anchor, and compression member may be constructed of a first material (91), and at least one of the receiver, anchor, and compression member may be constructed of a second material (92). The first and second materials may include different moduli of elasticity to prevent deformation of the assembly.