Compression bone screw
US4463753A · kind A · utility
Inventor
Key dates
| Filing date | Sep 11, 1981 |
| Grant date | Aug 7, 1984 |
| Priority date | — |
| Expiry date | Sep 11, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/863
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A compression screw having a proximal portion and a distal portion integrally interconnected by an intermediate tapering portion. The proximal and distal portions have threads of the same pitch. The intermediate portion has a smooth outer surface tapering the larger diameter proximal portion into the smaller diameter distal portion. The shaft of the proximal portion is cylindrical and the shaft of the distal portion is tapered, terminating in a sharp trocar point, and the threads of the proximal and distal portion may be provided with self-cutting flutes. The smooth tapering surface of the intermediate portion cooperates with the threads at the distal end to effect counteracting forces which cause compressions of the bone between the distal end and the taper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.