Adjustable bone screw assembly
US8603144B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2011 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Jul 22, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/7037
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A bone screw assembly includes a screw body, including anchor portion and rod-receiving portion, and a rod seat movably mounted in the screw body to allow for controlled angulation between a spinal connection element disposed in the rod seat and the screw body. The rod seat is pivotable in one or more selected directions about one or more axes relative to the screw body. The rod seat may include a first lower rod seat element disposed in a recess of the screw body having a cylindrical bottom surface to facilitate pivoting in a first direction. A second lower rod seat element is stacked on the first lower rod seat element and has a conical bottom surface abutting a top surface of the first lower rod seat element to facilitate pivoting in a second direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.