Fastener

Details Fastener Fastener

1997-07-03

1999-05-04

Tucker, Guy V.

Surgery

Instruments

Orthopedic instrumentation

606 73, 606104, A61B 1770

Patent

active

058999027

ABSTRACT:
An improved fastener is provided for use in retaining vertebrae in a desired spatial relationship. The fastener has a mounting section with a first external thread to engage a vertebra. The fastener has a retaining section with a second external thread to engage an internal thread on a retaining element, such as a nut. A pair of parallel flats are formed on opposite sides of the retaining section. The flats are spaced apart by a distance which is substantially the same as or greater than a root diameter of the external thread on the retaining section. A driving recess in an axially outer end of the retaining section has arcuate corner portions which receive force to effect rotation of the fastener relative to a vertebra engaged by the mounting section. The arcuate corner portions of the driving recess are offset from a plane containing the longitudinal central axis of the retaining section and extending perpendicular to the flats.

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patent: 5613968 (1997-03-01), Lin
patent: 5620443 (1997-04-01), Gertzbein et al.
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