Polyaxial bone anchors with increased angulation
First Claim
Patent Images
1. A polyaxial bone anchor for attaching a rod to a bone comprising:
- an anchor head comprising a longitudinal bore having a top and bottom opening, a generally U-shaped channel transverse to the longitudinal bore for receiving the rod, and a central axis extending through the hollow housing and bottom opening;
an anchor member for attaching to bone having a first portion and a second portion;
a locking member configured to be retained within the anchor head and to receive the first portion of the anchor member, the second portion of the anchor member extending through the bottom opening of the anchor head, the locking member allowing the anchor member to angulate at angles exceeding about 40 degrees from the central axis in all directions; and
a fastener removably mountable to the anchor head to close the top opening of the longitudinal bore and to lock the position of the rod in the U-shaped channel and the position of the anchor member.
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Accused Products
Abstract
A polyaxial bone anchor has a locking element shaped and configured to allow an anchoring member (e.g., a screw or hook) to polyaxially rotate at large angles about a central axis of the bone anchor before compression locking the anchoring member within an anchor head.
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Citations
47 Claims
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1. A polyaxial bone anchor for attaching a rod to a bone comprising:
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an anchor head comprising a longitudinal bore having a top and bottom opening, a generally U-shaped channel transverse to the longitudinal bore for receiving the rod, and a central axis extending through the hollow housing and bottom opening;
an anchor member for attaching to bone having a first portion and a second portion;
a locking member configured to be retained within the anchor head and to receive the first portion of the anchor member, the second portion of the anchor member extending through the bottom opening of the anchor head, the locking member allowing the anchor member to angulate at angles exceeding about 40 degrees from the central axis in all directions; and
a fastener removably mountable to the anchor head to close the top opening of the longitudinal bore and to lock the position of the rod in the U-shaped channel and the position of the anchor member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A polyaxial bone anchor for attaching a rod to a bone comprising:
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an anchor head comprising a longitudinal bore having a top and bottom opening, a generally U-shaped channel transverse to the longitudinal bore for receiving the rod, and a central axis extending through the hollow housing and bottom opening;
an anchor member for attaching to bone having a first portion and a second portion;
a locking member configured to be retained within the anchor head and to receive the first portion of the anchor member, the second portion of the anchor member extending through the bottom opening of the anchor head, the locking member comprising a collet having an upper portion comprising resilient tabs for compressing against the first portion of the anchor member, the collet having a lower portion comprising at least two prongs that form a cutout to allow the anchor member to angulate there through; and
a fastener removably mountable to the anchor head to close the top opening of the longitudinal bore and to lock the position of the rod in the U-shaped channel and the position of the anchor member. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A polyaxial bone anchor for attaching a rod to a bone comprising:
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an anchor head comprising a longitudinal bore having a top and bottom opening, a generally U-shaped channel transverse to the longitudinal bore for receiving the rod, and a central axis extending through the hollow housing and bottom opening;
an anchor member for attaching to bone having a first portion and a second portion;
a locking member configured to be retained within the anchor head and to receive the first portion of the anchor member, the second portion of the anchor member extending through the bottom opening of the anchor head, the locking member having a spherical exterior shape and having an interior area sized and shaped to receive the first portion of the anchor member, the locking member having an interior centerpoint offset from the centerpoint of the exterior shape of the locking member; and
a fastener removably mountable to the anchor head to close the top opening of the longitudinal bore and to lock the position of the rod in the U-shaped channel and the position of the anchor member. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification