Spring loaded, load sharing polyaxial pedicle screw assembly and method
US7892257B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2006 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Dec 22, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49948
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An assembly and method thereof comprising a screw head comprising an expandable bulbous end; a fixator component configured for receiving the bulbous end of the screw head; a load sharing mechanism positioned in between the bulbous end of the screw head and the bone fixator component, wherein the load sharing mechanism provides tensile resistance to the screw head; a pin mounted in the screw head; and a blocker adapted to engage the screw head. The screw head comprises a slot configured for receiving a longitudinal member. The load sharing mechanism may comprise any of a wave washer, a collapsible hollow washer, a coiled spring, and a flexible washer. Furthermore, the load sharing mechanism may comprise a washer having an outer surface with a plurality of cutout portions configured therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.