Patent ID: 7311712
Filing Date: 2007-12-25
Classification: A61B

Abstract:
1. A bone fixation assembly comprising: (a) a fixation device having a through passage; (b) an annular recess in said through passage; (c) a fastening screw having a threaded shaft for insertion through said through passage and threadable insertion into bone, and a head having substantially frustospherical shaped side surfaces; (d) a bushing having: (e) said fixation device through passage configured and dimensioned to downwardly receive said bushing therein to inwardly compress said upper end of said side wall of said bushing about said screw head, wherein said annular recess in said through passage is configured and dimensioned to annularly and directly receive said upper end of said annular cup shaped side wall of said bushing under compression with a snap fit when said upper end of said annular cup shaped side wall of said bushing is at said second circumference whereby said screw head is retained in said bowl and prevented from backing out.