Multi-axial spinal fixation system
US8475500B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2007 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | Apr 27, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/8875
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A spinal fixation system includes a rod and anchor devices that include a bone engaging fastener having a head defining a spherical socket. A ball insert is placed within the socket and rotated so that the ball insert is juxtaposed with the socket. The anchor device further includes a yoke defining a yoke channel for receiving the rod and a stem engaged to the ball insert captured within the socket. A sleeve disposed between the yoke channel and the fastener head supports the rod. A set screw is operable to clamp the rod against the sleeve and draw the insert into engagement within the socket. A releasable detent defined between the yoke and the fastener head is configured to releasably retain the yoke in at least one discrete position relative to the fastener. Portions of the releasable detent may also exert a frictional retention force against the fastener head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.