BONE SCREW ASSEMBLY WITH NON-UNIFORM MATERIAL
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United States of America Patent
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Issued Date -
Jun 24, 2010
app pub date -
Dec 22, 2009
filing date -
Dec 23, 2008
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A bone anchor comprises a screw having a threaded shank portion and a head portion, and a housing assembly. At least the threaded shank portion is formed from a titanium or titanium alloy and at least a portion of the housing is formed from a stronger material such as cobalt chrome. The housing assembly has a passageway extending therethrough and a proximal end and a distal end. A saddle is defined within the proximal end of the housing assembly and is configured to retain a portion of a rod therein. The distal end of the housing assembly is configured for securely engaging the head portion of the screw such that the screw is at least one of rotatable and pivotable with respect to the housing.
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