Thread-thru polyaxial pedicle screw system
US7942909B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2009 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Jan 5, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/7032
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A thread-thru polyaxial pedicle screw fastening system. The fastening system consists of an anchoring bone screw having threads on one end for use in anchoring to the screw to the spine and a spherical connector on the other end operating as a pivot point about which a U-shaped connecting assembly moves in a polyaxial fashion. The U-shaped connecting assembly, for receipt of a spinal connecting rod, has a biased retainer ring for maintaining a positive tension between the connecting assembly and the anchored screw. The system allows for an improved manufacturing step wherein the threaded shank of a bone screws can be passed through a lower portion of the connecting assembly allowing a variety of bone screw sizes to be used with a common sized connector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.