Apparatus for preventing screw backout in a bone plate fixation system
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United States of America Patent
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-
Nov 26, 1996
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 7, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system for internal fixation of bone includes a fixation plate having a number of bores therethrough, a corresponding number of screws each having an enlarged head portion and an elongated shaft portion defining bone engaging threads thereabout and a non-threaded portion between the head and threaded portions, and a corresponding number of screw anti-backout members each having a bore therethrough. The screw anti-backout members are positioned within the bores of the fixation plate and are initially sized to slidingly receive an elongated shaft therethrough. The screws are advanced through the plate bores and screw anti-backout members so that the fixation plate is secured to the underlying bone with the bores of the screw anti-backout members surrounding a non-threaded portion of the shafts. The system is thereafter heated sufficiently to shrink the bores of the screw anti-backout members, thereby trapping the non-threaded portions of the screw shafts between the fixation plate and the threaded portions.
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