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US 10,206,717 B1Granted
Apparatus and method for limiting a range of angular positions of a screw
AssigneeTheken Spine, LLC
InventorsEric A. Lab, Joel P. Bales, Simon Gerhard Sjovold, Keun-Young Anthony Kim
Life of this patent
Estimating the term…
Abstract
A spinal screw assembly is provided. The assembly may be provided with a screw and a movable head in which angulation of the screw relative to the movable head is constrained so that angulation within limits is allowed in one plane but lesser or no angulation is allowed in another plane. Methods to assemble the disclosed apparatus are also disclosed.
Claims13
A spinal screw apparatus, comprising:
- a screw, comprising a shaft and a screw head attached to said shaft, wherein said screw head further comprises a portion of a sphere;
- a movable head comprising a top portion and a bottom portion and an interior, wherein said interior is larger than said screw head, and being movable with respect to said screw head, said movable head having a U-trough through said top portion, wherein said U-trough has a U-trough axis;
- and
- wherein said movable head comprises a through-passageway bounded by an inner wall, wherein said inner wall comprises, adjacent a bottom of said through-passageway, a cylindrical surface and a single substantially planar surface.
1 more element
A spinal screw apparatus, comprising:
- a screw, comprising a shaft and a screw head attached to said shaft, wherein said screw head further comprises a portion of a sphere;
- and
- a movable head comprising a top portion and a bottom portion and an interior, wherein said interior receives said screw head, and said moveable head being movable with respect to said screw head, wherein said movable head has a U-trough through said top portion, wherein said U-trough has a U-trough axis;
- and
- wherein said movable head has a bottom opening through said bottom portion, wherein said bottom opening has a contact perimeter shape, wherein said contact perimeter shape comprises a curved portion and a single straight portion that connects with said curved portion.
2 more elements
Dependencies are inferred from the claim text.