Cervical Plate Fixation System

摘要

A bone fixation assembly comprises a plate having a top surface and a bottom surface and defining at least one bone screw bore, the bore including a circumferential rib situated between the top and bottom surfaces of the plate and at least one scallop interrupting the circumferential rib. A bone engaging fastener is provided for each bore, the fastener having a shank defining bone engaging threads and an enlarged head. The head defines threads for threaded engagement with the circumferential rib, with a lead thread configured to pass through a scallop to allow the threads to engage the circumferential rib.

主权项

1. A bone fixation assembly comprising:
a plate having a top surface and a bottom surface and defining at least one bore between said surfaces, said bore including an inner surface and only one circumferential rib projecting outwardly from said inner surface toward the interior of said bore substantially continuously around said inner surface and situated between said top and bottom surfaces of said plate, said bore further defining at least one scallop interrupting said circumferential rib; and a bone engaging fastener corresponding to each of said at least one bore, said fastener having a shank defining bone engaging threads and a head, said head defining locking threads for threaded engagement with said circumferential rib, said locking threads including a lead thread configured to pass through said scallop to allow said locking threads to engage said circumferential rib.