Bone fixation apparatus, method and tool for assembling the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
May 27, 2004
app pub date -
Nov 29, 2002
filing date -
Nov 25, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Disclosed is a bone fixation apparatus. This apparatus comprises a bone screw having a head; a cap member placed on the head of the bone screw; a receiver member having a bore in which the cap member and the head of the bone screw are respectively accommodated and held, and a U-shaped channel through which a support bar extends; and a compression member threadedly coupled into the receiver member to downwardly bias the support bar; wherein a multitude of stepped portions are formed at the lower end and on the inner surface of the receiver member, an accommodating chamber is defined above the stepped portions to accommodate therein the cap member, internal threads are formed on the inner surface of the receiver member to allow the compression member to be threadedly coupled therewith, and an outward flange is formed around the upper end of the cap member, thereby preventing movement of a bone, improving the assemblability of the bone fixation apparatus and keeping a cap member from being released.
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