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US 8,133,262 B2Granted
Large diameter bone anchor assembly
AssigneeDePuy Spine, Inc.
InventorDale E. Whipple
Life of this patent
Estimating the term…
Abstract
Bone anchor assemblies having a large diameter for fixing a spinal connection element to bone and methods of assembly are described. The assembly includes a receiver member for receiving the spinal connection element, a bone-engaging shank for engaging bone, a retaining member for retaining the head of the shank within the receiver member and a locking member for locking the retaining member within the receiver member.
Claims15
A bone anchor assembly for engagement to a connection element comprising:
- a receiver member having an opening at the proximal end for receiving the connection element and a bore at the distal end, the receiver member having a seat portion having a groove provided within the distal end, between the opening and the bore, and being accessible from the bore;
- a bone-engaging shank having a generally spherically shaped head at a proximal end, the head sized to fit within the bore of the receiver member and having a generally hemispherically shaped distal surface;
- a retaining member interposed between the head of the shank and the bore at the distal end of the receiver member, the retaining member having an outer surface shaped to fit and positioned within the seat portion of the receiver member and a proximal inner surface shaped to accommodate the head of the bone-engaging shank, the distal surface of the head of the shank engaging the proximal inner surface of the retaining member to thereby retain the head within the receiver member;
- and
- a locking member shaped to fit and positioned within the groove of the seat portion to thereby lock the retaining member within the seat portion of the receiver member.
2 more elements
A bone anchor assembly for engagement to a connection element comprising:
- a receiver member having an opening at the proximal end for receiving the connection element and a bore at the distal end leading to a seat portion having a groove, the opening including an internal thread having a minor diameter and a major diameter;
- a bone-engaging shank having a generally spherically shaped proximal head having a distal surface, the shank having an external thread having a major diameter greater than the minor diameter of the opening of the internal thread of the opening of the receiver member;
- a retaining member positioned within the seat portion of the receiver member having a proximal inner surface engaging the distal surface of the head of the shank;
- and
- a locking member positioned within the groove of the seat portion to thereby lock the retaining member within the seat portion of the receiver member.
2 more elements
Dependencies are inferred from the claim text.