Spondylolisthesis screw and instrument for implantation
US8388659B1 · kind B1 · utility
90Cited by
115References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2009 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Apr 16, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2090/037
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A screw for use in spinal surgery provided with a screw shaft and a screw head and at least one extension tab extending proximally from the screw head, the extension tab being defined relative to the screw head by a stress concentration feature. At a proximal end of the extension tab, the extension tab may be narrower in a circumferential direction than the extension tab at a distal portion thereof. A particular shape of stress concentration may be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.