Set screw for use with osteosynthesis apparatus
US6004349A · kind A · utility
Inventor
Key dates
| Filing date | Jan 6, 1997 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jan 6, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2090/037
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An improved set screw, for use in an osteosynthesis apparatus to secure and fix the spinal rod in the bore of the head of a bone screw, hook, connector or the like from translational or rotational motion, which comprises a head of hexagonal external cross-section and a lower portion having a threaded outer surface. A point is centrally formed on a lower surface of the set screw for penetrating into the rod and the point is preferably surrounded by a spaced and sharpened ring. In some embodiments a peripheral notch is formed between the head and the lower threaded portion of the set screw. A cylindrical bore comprising an upper bore section and a lower bore section is formed in the set screw such that the upper bore section extends through the head and the lower bore section extends partially through the set screw lower portion. The set screw functions in an embodiment with a cap to provide multiple points of contact with penetration into a first member to secure the first member to a second member associated with the cap in a relatively very stable system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.