Bone screw assembly with non-uniform material
OwnerJohn Carboneinventor
Life of this patent
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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.
Claims9
A bone anchor comprising:
- a screw having a threaded shank portion and a head portion;
- a housing assembly having a passageway extending therethrough and a proximal end and a distal end, a saddle defined within the proximal end of the housing assembly and configured to retain a portion of a rod therein, the distal end of the housing assembly configured to securely engage the head portion of the screw such that the screw is at least one of rotatable and pivotable with respect to the housing;
- and
- wherein at least a portion of the screw is formed from a first material and at least a portion of the housing assembly is formed from a second material that is stronger than the first material.
Dependencies are inferred from the claim text.