Polyaxial locking screw plate assembly
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United States of America Patent
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Dec 25, 2007
Grant Date -
Sep 1, 2005
app pub date -
Feb 26, 2004
filing date -
Feb 26, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A bone fixation assembly includes a fixation device, a cup shaped bushing, and a fastening screw. The fixation device has a through passage with an annular recess. The a fastening screw has a threaded shaft for insertion through the through passage and for threadable insertion into bone. The screw has a head with substantially frustospherical shaped side surfaces and mates with the cup shaped bushing. The annular recess in the through passage of the fixation device is configured and dimensioned to downwardly, directly, and annularly receive an upper end of the bushing under compression with a snap fit to prevent the screw from backing out of the bone fixation assembly.
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