Translational posterior cervical polyaxial screw
US10070897B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2017 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | Dec 19, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/00982
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A translating polyaxial bone screw assembly for anchoring a connecting rod to a spinal vertebra comprises a bone screw having a threaded shank and a head coupled to a yoke. The yoke has at one end a rod receiving channel for receiving a connecting rod and an opposite end that is coupled to the bone screw by a coupling assembly. The coupling assembly couples the yoke for polyaxial movement relative to the bone screw and for translational movement of the yoke in a direction transverse to the axis of the bone screw. The coupling assembly comprises a biasing element supported for joint movement with the yoke that provides a manually surmountable tension force between the yoke and bone screw head that is maintained during polyaxial and translational movement. A fastening element is supported by the yoke for securing the connecting rod between the fastening element and the coupling assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.