Multi-axial spinal fixation system
US9545279B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2013 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Feb 5, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/8605
- 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 friction element in the form of a wave spring is disposed between the yoke and the fastener head is configured to releasably retain the yoke in at least one discrete position relative to the fastener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.