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US 5,360,448 AGranted
Porous-coated bone screw for securing prosthesis
OwnerJeffrey J. Thramanninventor
Life of this patent
Estimating the term…
Abstract
Bone screws are disclosed with and without heads and with the screw shaft provided with axially adjacent longitudinally extending regions, one or more of which have bone ingrowth porous surfaces and alternate with regions having threaded surfaces. The headed embodiments have a region with a threaded surface nearest the head.
Claims7
A bone screw comprising:
- a shaft of circular cross section having a driving end provided with a tool engaging means, and an opposite leading end;
- said shaft from said driving end to said leading end being divided into a plurality of adjacent coaxially aligned longitudinal regions, at least two of said regions that are not contiguous having an external bone ingrowth porous circumferentially continuous surface free from threads along their respective lengths, and at least one of said regions located between said two porous surface regions having an externally threaded non-porous surface throughout its length.
Dependencies are inferred from the claim text.