Polyaxial bone anchors with pop-on shank, friction fit fully restrained retainer, insert and tool receiving features
US9907574B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2011 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | Nov 9, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/7076
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. The receiver can have crimp tabs, but is devoid of spring tabs and collet-like flexible structures. A down-loadable compression insert (some with lock and release feature), a down-loadable friction fit split retaining ring and an up-loadable shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled. The receiver and insert include aligned tool receiving apertures for lock and release of the polyaxial mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.