| 摘要 |
<p>A modular polyaxial pedicle screw and orthopedic rod implant device includes a shaft portion (100, 300), a cuff (130, 350), a stem portion (120, 320), and a rod coupling sub-assembly (160, 360). The shaft portion (100, 300) is designed to be inserted into the pedicle, and in alternative embodiments includes a recess (108) and a convex semi-spherical bubble (308). In both embodiments, the shaft (100, 300) also includes a threading (110, 310) formed on the exterior surface. The stem portion (120, 320) is a threaded post and either an enlarged ball (124) or a recessed socket (324). The cuff (130, 350) is a cylindrical element that seats around the interface of the ball and socket combination initially so that the stem (120, 320) and shaft (100, 300) may polyaxially rotate and subsequently hold the stem and shaft in final securement.</p> |
