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US 7,404,818 B2Granted
Side-loading adjustable bone anchor
AssigneeWarsaw Orthopedic, Inc.
InventorsKeith E. Miller, Greg Denzer
Life of this patent
Estimating the term…
Abstract
A side-loading bone anchor is provided, which may be used in cervical, thoracic, lumbar or sacral areas of the spine or other orthopedic locations. In one embodiment, the anchor includes an anchoring portion, a receiving portion, and an internal piece that is rotatable with respect to the receiving portion at least to a degree. The anchoring portion is attached to a bone. A rod or other elongated support member is received in the receiving portion in contact with the internal piece. The rod and internal piece may be rotated for variability substantially in a plane, and a set screw is threaded into the receiving portion to lock the rod within the receiving portion.
Claims34
An apparatus for attachment to a vertebra and a spinal rod, comprising:
- a bone anchor portion having a threaded shaft with a longitudinal axis and a neck, said threaded shaft having cancellous threads suited to connection to a vertebra;
- a substantially C-shaped receiving portion having a lower leg integrally connected to said neck of said bone anchor portion and an upper leg and an intermediate portion, said receiving portion having a channel substantially perpendicular to said axis into which a rod can be placed in said receiving portion, said channel having a mouth for introduction of said rod, said receiving portion further including an internally threaded aperture through said upper leg, said receiving portion further including an opening in said lower leg and said intermediate portion, said receiving portion further including at least one exterior imprint adapted for accommodating a holding tool;
- an internal piece connected to said receiving portion so that at least a portion of said internal piece is within said opening of said receiving portion, said internal piece having a post portion extending into said intermediate portion of said receiving portion, and a seat portion having a first end and a second end, said first end of said seat portion being attached to said post portion of said internal piece, said second end having a flat portion, said seat portion having a substantially cylindrical inner surface having an arc of up to about 120 degrees, and said post portion having a groove;
- and
- a ring member surrounding at least a portion of said post portion of said internal piece such that at least a portion of said ring member is within said groove, wherein said ring member is positioned so that said internal piece and said receiving portion are rotatable with respect to each other and so that said post portion of said internal piece and said ring member cannot be withdrawn from said opening of said receiving portion.
2 more elements
A side-loading bone anchor apparatus, comprising:
- a substantially C-shaped receiving portion having a lower leg, an upper leg and an intermediate portion, said receiving portion having a channel between said upper and lower legs and substantially perpendicular to said intermediate portion, said receiving portion further including a hollow in said lower leg and a hole in said intermediate portion;
- a bone anchor portion with a longitudinal axis connected to said lower leg of said receiving portion, said axis being substantially parallel to said intermediate portion;
- an internal piece including a post portion and a seat portion, said post portion being substantially linear and said seat portion having a substantially cylindrical inner surface, said seat portion having a first end and a second end, said first end of said seat portion being attached to said post portion, said second end having a flat portion that is non-parallel to said post portion, wherein said post portion of said internal piece is within said hole and does not extend beyond said intermediate portion and said seat portion is adjacent said hollow of said receiving portion, wherein said internal piece is rotatable about said post portion with respect to said receiving portion;
- and
- a set screw connected to said receiving portion,
- whereby said set screw and said seat portion of said internal piece are adapted to contact an elongated member positioned in said channel to lock the elongated member, said seat portion, and said receiving portion with respect to each other.
3 more elements
An apparatus for attachment to a vertebra and a spinal rod, comprising:
- a bone anchor portion having a threaded shaft with a longitudinal axis and a neck, said threaded shaft having a longitudinal axis and cancellous threads suited to connection to a vertebra;
- a substantially C-shaped receiving portion having a lower leg integrally connected to said neck of said bone anchor portion and an upper leg and an intermediate portion, said receiving portion having a channel substantially perpendicular to said axis into which a rod can be placed in said receiving portion, said channel having a mouth for introduction of said rod, said receiving portion further including an internally threaded aperture through said upper leg, said receiving portion further including an opening in said lower leg and said intermediate portion, said receiving portion further including at least one exterior imprint adapted for accommodating a holding tool;
- an internal piece connected to said receiving portion so that at least a portion of said internal piece is within said opening of said receiving portion, said internal piece having a post portion extending into said intermediate portion of said receiving portion, and a seat portion having a first end and a second end, said first end of said seat portion being attached to said post portion of said internal piece, said second end having a flat portion, said seat portion having a substantially cylindrical inner surface having an arc of up to about 120 degrees, and said post portion having a groove;
- and
- a ring member surrounding at least a portion of said post portion of said internal piece such that at least a portion of said ring member is within said groove, wherein said ring member is positioned so that said internal piece and said receiving portion are rotatable with respect to each other and so that said post portion of said internal piece and said ring member cannot be withdrawn from said opening of said receiving portion;
- wherein an elongated member is within said channel and adjacent said seat portion of said internal piece, and wherein no part of said internal piece is between said elongated member and said upper leg.
3 more elements
Dependencies are inferred from the claim text.