Multi-axial bone screw assembly
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United States of America Patent
Stats
-
Dec 9, 2003
Issued Date -
N/A
app pub date -
Aug 28, 2001
filing date -
Sep 1, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bottom-loading multi-axial bone anchor apparatus is disclosed. The apparatus includes a receiver member, a crown member, a bone anchor and a retaining member. The receiver member defines an upper opening and a lower opening, which may form part of the same opening, a channel, and a groove. The crown member and bone anchor are loaded into the lower opening of the receiver member, and the retaining member fits around the bone anchor and into the groove in the receiver member. The bone anchor is capable of multi-axial positioning with respect to the receiver member. An elongated member is placed in the channel of the receiver member, contacting the crown member, and a compression member is applied via the upper opening. The compression member presses down on the elongated member, which presses down on the crown member and locks the bone anchor between the crown member and the retaining member.
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