Device comprising a plate and screws for fastening a plate to a bone
US4388921A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1981 |
| Grant date | Jun 21, 1983 |
| Priority date | — |
| Expiry date | May 22, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/1728
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A plate bearing against a bone has a number of clearance holes with sleeves. Openings provided in the sleeves include each a section diverging away from the bone and bounded by a conical surface. The sleeves are subdivided into tongues by means of slots cut into the free face of the collar. A screw is screwed into the bone at every clearance hole, the head of the screw being bounded by a conical or convex surface. By tightening the screw the tongues are forced apart by the head of the screw, thus clamping the sleeve in relation to the plate. This provides a guarantee, that the plate will stay rigidly connected with the screws, even if a reabsorption of bone takes place. Some of the sleeves comprise clamping parts excentric in relation to the screw axes, enabling the surgeon to press the bone pieces against each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.