Transpedicular screw system and method of use

A device for the stabilization of one or more bone segments, comprising:

• at least two anchors and a rod, said anchors each comprising a screw, an anchor seat, a cap, and a nut, said screw having a shank joined to a head, said head having a rounded profile where it joins said shank;
• said anchor seat having an internal bore, said screw projecting through said bore to be received by said bone segment and said bore including a shoulder which cooperates with the rounded profile of the screw head and said anchor seat further including external threads and a channel to receive said rod;
• said cap having a smaller outer diameter portion which is received within said anchor seat bore and a large outer diameter portion forming at one end an arch including opposing rod holding flanges;
• said larger outer diameter portion mating with said rod receiving channel whereby said rod is captured between said arch and said channel;
• and said nut including top and bottom surfaces and having threads which mate with the threads of the anchor seat and said nut being posterior to said rod and tightening down toward rod whereby said bottom surface engages said opposing rod holding flanges and causes said cap to apply a compressive force to said rod.