Pivotal bone anchor assembly with frictional shank head seating surfaces
US10058354B2 · kind B2 · utility
36Cited by
366References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2014 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Jan 27, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2090/037
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A two-piece closure for polyaxial bone screws includes an outer fastener and an inner set screw, the outer fastener having a drive system with pockets that cooperate with a pronged drive tool. The polyaxial screw includes a lower pressure insert engaged with the outer fastener, the insert in some embodiments being made from a cobalt chrome alloy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.