Interference screw with rounded back end and cannulated sheath for endosteal fixation of ligaments
US5425733A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1993 |
| Grant date | Jun 20, 1995 |
| Priority date | — |
| Expiry date | Jun 4, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S606/916
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An interference screw and sheath for endosteal fixation of ligaments. A graft, attached between previously cut bone blocks, is placed under tension in a graft tunnel. The screw is driven between the bone to which the graft is being fixed and a corresponding one of the bone blocks. The screw includes an end portion having rounded back edges for protecting the graft from inadvertent damage after the sheath has been removed. The screw may be cannulated for insertion over a prepositioned guide pin. The guide pin has a larger than normal diameter to prevent the pin from bending during insertion. The screw cannulation is sufficiently large to accommodate the enlarged guide pin. The sheath has a cutout at one end such that during screw insertion, the graft is covered by the sheath and protected from the threads of the screw, while the bone to which the graft is being fixed is exposed to the threads of the screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.