Threaded washer
US5997541A · kind A · utility
231Cited by
18References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 17, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Nov 17, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S606/908
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A threaded washer with a central bore for use with a bone screw is disclosed. The washer is threaded into a counterbore extending below the bone surface and into cancellous bone material. The external washer threads are tapered to provide improved purchase. The bone screw is inserted through the central bore of the washer and threaded into the fragment beyond the fracture. The washer provides improved compressive forces while permitting the bone screw head to be located beneath the bone surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.