Polyaxial locking screw plate assembly
US7311712B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 2004 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Aug 3, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/8685
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A bone fixation assembly includes a fixation device, a cup shaped bushing, and a fastening screw. The fixation device has a through passage with an annular recess. The a fastening screw has a threaded shaft for insertion through the through passage and for threadable insertion into bone. The screw has a head with substantially frustospherical shaped side surfaces and mates with the cup shaped bushing. The annular recess in the through passage of the fixation device is configured and dimensioned to downwardly, directly, and annularly receive an upper end of the bushing under compression with a snap fit to prevent the screw from backing out of the bone fixation assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.