Multi-axial bone anchor system
First Claim
1. A medical implant apparatus comprising:
- a plate member having a longitudinal axis, an upper portion and at least one substantially L-shaped lower portion connected to said upper portion, said upper portion having a substantially flat upper surface, wherein the intersection of said upper surface and a plane perpendicular to said longitudinal axis forms at least one straight segment, and at least one hole therethrough, said lower portion having a flange piece extending substantially parallel to said upper portion;
a washer having an upper surface, a lower surface, and an aperture, said lower surface being adjacent said upper portion of said plate member; and
a nut having a sleeve portion that extends into said aperture.
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Accused Products
Abstract
A multi-axial bone fixation implant includes an elongated member, one or more bone anchor assemblies, and stabilizer members fitted within the elongated member. A bolt having a bone-threaded end and a machine-threaded end and an enlarged medial portion is also provided. The bolt is anchored into a bone, and its machine-threaded end passes through the elongated member and the stabilizer, and is engaged by a coupled washer and nut. The washer includes an oblong aperture, and the nut includes a projecting sleeve. The sleeve is inserted into the washer and expanded, and the washer retains the sleeve without impairing relative rotatability or translatability of the nut and washer. When locked by the nut and washer, the enlarged portion of the bolt is forced against the stabilizer, which locks against the elongated member. The elongated member can be fixed with respect to the anchor at an infinite number of multi-axial angles.
125 Citations
29 Claims
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1. A medical implant apparatus comprising:
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a plate member having a longitudinal axis, an upper portion and at least one substantially L-shaped lower portion connected to said upper portion, said upper portion having a substantially flat upper surface, wherein the intersection of said upper surface and a plane perpendicular to said longitudinal axis forms at least one straight segment, and at least one hole therethrough, said lower portion having a flange piece extending substantially parallel to said upper portion; a washer having an upper surface, a lower surface, and an aperture, said lower surface being adjacent said upper portion of said plate member; and a nut having a sleeve portion that extends into said aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A stabilizer for use with a medical implant, comprising:
a body having an octagonal shape and a substantially smooth upper surface, a hole extending through said body and having an axis, said hole having at least one tapered section, and at least one finger extending away from said axis, wherein said body has a lower surface that is convex. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
Specification