Rotationally ratcheting bone screw
US5997538A · kind A · utility
143Cited by
7References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Mar 23, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2250/0007
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A rotationally ratcheting bone screw including a body having a distal end formed with an engagement tip for engaging bone tissue, and a shaft formed with a unidirectional stop. The bone screw further includes a fastening element formed with an opening complementally configured to receive the shaft and responsive to relative rotation between the shaft and fastening element to axially advance along the shaft. The fastening element includes a rotationally sensitive ratchet element to cooperate with the stop and inhibit relative counter-rotation between the shaft and the fastening element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.