Tools for use in installing osteosynthesis apparatus utilizing set screw with break-off head
US5941885A · kind A · utility
Inventor
Key dates
| Filing date | Oct 8, 1996 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Oct 8, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2090/037
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Tools for use in installing osteosynthesis apparatus utilizing a set screw having a break off head, a lower threaded portion and a cylindrical bore extending at least partially through the set screw head. Several of the tools comprise socket type tools having a handle, a stem and a head with a socket formed therein. A projection extends axially into the socket from an inner end of the socket and includes an outwardly biasing element thereon. The projection is sized for insertion into at least a portion of the bore extending into the set screw head, when the set screw head is positioned in the socket. The outwardly biasing element biases against an internal wall of the head which defines the upper section of the cylindrical bore, in order to grip the head. In another tool of the set the tip of the stem is threaded and sized for threaded insertion into the set screw receiving bore of an osteosynthesis implant. Another tool of the set comprises forceps having first and second socket halves formed in opposed grasping portions of the socket. When the grasping portions are advanced together, the first and second socket halves form a socket within which a set screw secured to an implant m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.