Spinal fusion system
US9192483B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2015 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | Jun 29, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00023
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An improved spinal fusion system (10) for positioning between a first and second vertebral body, the system (10) has a body (100), a pair of polyaxial fasteners (220) and a locking bridge (102). The distal end has a slotted opening (120) extending through the body (100) and forming a gap extending between the two or more bore holes (110) to form a deflectable bridge (102) spanning the bore holes (110). The bridge (102) has a center opening (50) for receiving a set screw (20) passing through the bridge (102) into a threaded opening (52) in the body. When the set screw (20) is tightened, it deflects the bridge (102) closing the gap as the bridge (102) contacts an exterior surface of each head (210) of the polyaxial fasteners (200). The angulation of each polyaxial screw (200) is adjustable, controlled by the tightening of the set screw. Initial contact of the bridge (102) with the head (210) of the fastener (200) reduces angulation movement of the shank (220) requiring manual manipulation. Increased tightening of the set screw (20) fixes the angulation as the bridge (102) reduces the gap and increases fastener head contact forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.