Spinal fixation device
US8425514B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2008 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Dec 19, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00023
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A spinal fixation assembly has a bone screw with head having a continuously curved spherical outer surface. The curved surface nests in a split annular bushing having a plurality of segments curving around the screw head. The bushing has an outward extending flange that fits into a recess in a socket in a fixation plate. The plate has at least three legs which extend from ends of a cross-member to form one of an H shaped, X shaped or A shaped configuration. Each socket is curved to rotatably receive rotation of the bushing. The socket recess is larger than the bushing flange to allow the bushing to tilt a predetermined amount depending on a thickness of the outward extending flange.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.