Patent ID: 7214227
Filing Date: 2007-05-08
Classification: A61B

Abstract:
1. A medical implant device comprising: a receiver member including a plurality of wall sections defining a longitudinal bore, wherein said wall sections have an inner threaded portion; and a closure member including a rearward end, a forward end, a substantially cylindrical body having a longitudinal axis and an outer threaded portion for threaded engagement with said inner threaded portion of said receiver member, wherein the outer thread portion includes a screw form for a given cross-section of thread through a plane which includes the longitudinal axis, the screw form comprising: a rearward-facing thread surface having a substantially straight sloped portion and at least two non-contiguous curve portions, such that a point on the rearward-facing thread surface at a root of the thread surface is farther from the forward end than a point on the rearward-facing thread surface at a crest of the thread surface when measured along a line parallel to the longitudinal axis; wherein a maximum thickness of the thread occurs at a point closer to the crest of the thread than the root of the thread.