Staged locking of surgical screw assembly
US9155581B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2012 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Apr 10, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2090/037
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical screw assembly including: a fastener including an elongate shaft having a proximal end and a distal end and a head at the proximal end. A tulip having a an internal bearing surface is provided. A distal end of the tulip has a bore therethrough defining the internal bearing surface. Locking enhancement features are configured to cooperate with the head, such that, in an unlocked configuration, the head is movable relative to the tulip; in a provisionally locked configuration, the locking enhancement features engage the head with a first polyaxial grip strength; and in a finally locked configuration, the locking enhancement features engage the head with a second polyaxial grip strength greater than the first polyaxial grip strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.