Bi-radial pop-on cervical bone anchor
US9451993B2 · kind B2 · utility
30Cited by
359References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2015 |
| Grant date | Sep 27, 2016 |
| Priority date | — |
| Expiry date | Jan 7, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/7082
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A cervical polyaxial bone anchor includes a longitudinal connecting member receiver structure and a cooperating shank. The shank has a body and an integral head with first and second spherical surfaces of different radii and a plurality of spaced curvate apertures for receiving portions of the longitudinal connecting member to result in a greater angle of inclination of the shank with respect to the receiver. The receiver has an upper channel and a lower cavity that further includes an expansion area and an operational seat for a split retainer ring that captures and fixes the shank head within the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.