Modular tensioned spinal screw
US11219470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2020 |
| Grant date | Jan 11, 2022 |
| Priority date | — |
| Expiry date | Apr 8, 2040 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/8605
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A modular tensioned spinal screw comprises a bone fastener having a threaded elongate shaft and a spherical head at an upper end of said shaft. A modular yoke for polyaxial attachment to the head of said bone fastener has an inner bore, an upper end configured to receive a connecting rod and a lower end configured to receive the head of the bone fastener. An axially movable radially expandable socket collar, and a saddle having a rod receiving cradle are supported within the yoke bore. A retention pin fixed to the yoke movably supports the saddle and a tension member within the bore. The tension member comprises a resilient biasing element oriented such that upward axial movement of the saddle produces a downward bias force on said saddle to compress the head of the bone fastener between said saddle and said socket collar in a provisional holding position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.