Polyaxial locking screw plate assembly
US8048131B2 · kind B2 · utility
7Cited by
86References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2007 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Apr 14, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/8685
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A bone fixation screw includes a threaded screw shank and a screw head having upper and lower ends. The screw head lower end is secured to a proximal end of said screw shank. The screw head has substantially frustospherical shaped side surfaces and is split into segments at one of the ends. The head is radially expandable at the one end. An expansion screw is centrally received in the screw head. An interface between the expansion screw and the screw head forms a cam mechanism for expanding the screw head upon axial rotation of the expansion screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.