Patent ID: 6800079
Filing Date: 2004-10-05
Classification: A61B

Abstract:
An orthopedic device, comprising, in combination:a threaded shaft said shaft having one terminus provided with rotational means about a single axis transverse to a long axis of said threaded shaft and means to prohibit all other rotation, a cup having an upper end with interior threads and having a lower rotational means receiving area dimensioned to allow rotation of said threaded shaft about said one terminus and about a said single axis transverse to said long axis of said threaded shaft and means to prohibit all other rotation, said cup having a transverse slot, a rod passing through said slot and abutting a saddle on said rotational means in proximate tangential registry, and bolt means threaded to said cup's interior threads to fix said rod and said threaded shaft into a fixed position relative to said cup wherein said threaded shaft has first and second thread patterns thereon wherein said threaded shaft first and second thread patterns have differing thread pitch, such that said second thread pattern has finer threads than said first thread pattern wherein said thread patterns have crests which are axially offset from their respective roots, inducing a radially inward directed force.