Bone screw

Details Bone screw Bone screw

1997-10-08

2001-01-02

Buiz, Michael (Department: 3731)

Surgery

Instruments

Orthopedic instrumentation

Utility Patent

active

06168597

ABSTRACT:

The invention relates to a bone screw according to the preamble of claim
1
.
Such a bone screw is known from DE 39 36 703 C2. The free front end of the threaded shaft of this bone screw is expanded by means of an expanding member introduced into a longitudinal bore of the screw. This expansion serves, on the one hand, as a safety device against reversed rotation and, on the other hand, to increase the anchoring forces acting between the bone material and the screw thread.
The necessary screwing mechanism requires a minimum dimension.
It is the object of the invention to provide a bone screw with an exceptionally small diameter and a lock against reverse rotation, which bone screw is capable to be anchored in the bone and can, after being screwed into the bone, be expanded at its top portion in a finely controlled manner in a second operating step.
This object is achieved by a bone screw according to claim
1
.
Further developments of the invention are defined in the subclaims.
Embodiments of the invention will be described below with reference to the Figures.


REFERENCES:
patent: 4611581 (1986-09-01), Steffee
patent: 4716893 (1988-01-01), Fischer et al.
patent: 4760843 (1988-08-01), Fischer et al.
patent: 5489210 (1996-02-01), Hanosh
patent: 39 36 703 A1 (1991-05-01), None
patent: 39 36703 A1 (1991-05-01), None
patent: 39 36 703 C2 (1992-09-01), None
patent: 0 504 915 A1 (1992-09-01), None
patent: 209 422 (1992-08-01), None
patent: WO/91 11967 (1991-08-01), None

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