Multi-axial bone screw mechanism
US7306606B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 2004 |
| Grant date | Dec 11, 2007 |
| Priority date | — |
| Expiry date | Mar 28, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/7032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A bone screw assembly including a coupling member with a lower surface and a channel formed by two arms extending from a base portion. The coupling member has a hole extending from the base portion of the channel to its lower surface. The assembly further includes a spacer having a top surface adjacent the base portion of the channel and a bottom surface generally opposite the top surface within the hole of the coupling member, and includes a hollow retaining ring within the hole of the coupling member, the retaining ring comprising an inner surface, an outer surface, a top surface spaced from the bottom surface of the spacer, and a slot extending from the inner surface of the ring to the outer surface of the ring. The assembly includes a bone screw having a head portion with an outer surface adjacent to the inner surface of the retaining ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.