Multi-lock anterior cervical plating system
First Claim
1. An anterior cervical plate for engaging at least two vertebral bodies of a human cervical spine along the anterior aspect of the spine, said plate having a lower surface for contacting the cervical vertebral bodies and an upper surface opposite to said lower surface, said plate having a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, at least a first and second of said bone screw receiving holes being associated with a first of the cervical vertebral bodies, and a recess associated with said at least first and second of said bone screw receiving holes, said recess having a configuration for retaining a locking element for locking at least two bone screws in said at least first and second bone screw receiving holes, the central longitudinal axis of said recess being offset from a transverse line passing through the central longitudinal axes of said first and second bone screw receiving holes.
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Accused Products
Abstract
Anatomically contoured anterior cervical plates with bone ingrowth surfaces, providing for intersegmental compressive preloading, and a rigid and locked interface to all of the bone screws, with those engaging the vertebrae deployed in highly convergent pairs. The bone screws have a tapered self-tapping leading end, an increasing root diameter with a generally constant outer diameter with a thread that is narrow and sharp throughout and an enlarged head portion capable of an interference fit to the receiving holes of the plate. Instrumentation consists of plate holders, a compression apparatus and a pilot hole forming device that interlocks with the plate. Methods for spinal compression and bone hole preparation are provided.
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Citations
173 Claims
- 1. An anterior cervical plate for engaging at least two vertebral bodies of a human cervical spine along the anterior aspect of the spine, said plate having a lower surface for contacting the cervical vertebral bodies and an upper surface opposite to said lower surface, said plate having a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, at least a first and second of said bone screw receiving holes being associated with a first of the cervical vertebral bodies, and a recess associated with said at least first and second of said bone screw receiving holes, said recess having a configuration for retaining a locking element for locking at least two bone screws in said at least first and second bone screw receiving holes, the central longitudinal axis of said recess being offset from a transverse line passing through the central longitudinal axes of said first and second bone screw receiving holes.
- 28. An anterior cervical plate for engaging at least two vertebral bodies of a human cervical spine along the anterior aspect of the spine, said plate having a length sufficient to span at least two adjacent cervical vertebral bodies, said plate having a lower surface for contacting the cervical vertebrae and an upper surface opposite to said lower surface, said plate having a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, at least a first and second of said bone screw receiving holes being associated with a first of the cervical vertebral bodies, and a recess for retaining a locking element for locking bone screws in said bone screw receiving holes, said recess having a central longitudinal axis offset from a transverse line passing through the central longitudinal axes of said first and second bone screw receiving holes, and a locking element movably engageable in said recess, said locking element being movable from at least a first position to a second position when engaged to said plate, said locking element being configured so as to permit insertion of bone screws into each of said first and second bone screw receiving holes when said locking clement is in said first position and is engaged to said plate, and said locking element bearing against at least a portion of at least two of said bone screws in said first and second bone screw receiving holes, respectively, when moved to said second position.
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75. An anterior cervical plate system for engaging at least two vertebral bodies of a human cervical spine along the anterior aspect of the spine, said system comprising:
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a plate having a first end, a second end, and a length sufficient to span at least two adjacent cervical vertebral bodies, said plate having a lower surface for contacting the cervical vertebral bodies and an upper surface opposite to said lower surface, said plate having a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, at least a first and second of said bone screw receiving holes being associated with a first of the adjacent vertebral bodies, and a recess for retaining a locking element for locking bone screws in said bone screw receiving holes, said recess having a central longitudinal axis offset from a transverse line passing through the central longitudinal axes of said first and second bone screw receiving holes, and a locking element movably engageable in said recess and being movable from at least a first position to a second position, said locking element having a head having a configuration so as to permit insertion of bone screws into said first and said second bone screw receiving holes, respectively, when in said first position, and said head bearing against a portion of the bone screws inserted into said first and said second bone screw receiving holes respectively, when moved to said second position; and
a plurality of bone screws each having a longitudinal axis and insertable into a respective one of said bone screw receiving holes in a direction from said upper surface to said lower surface to secure said plate to a the vertebral bodies. - View Dependent Claims (76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125)
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126. An anterior cervical plating system for engaging at least three vertebral bodies of a human cervical spine along the anterior aspect of the spine, said system comprising:
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a plate having a generally rectangular configuration with a first end, a second end, sides, and a length sufficient to span at least two adjacent cervical vertebral bodies, said plate having;
rounded lobes at each corner of said generally rectangular configuration and having rounded lobes on said sides between said first and second ends;
a lower surface for contacting the cervical vertebral bodies and an upper surface opposite to said lower surface;
a bi-concave curvature for conforming to the anterior aspect of the cervical spine in lordosis, said bi-concave curvature having a longitudinal concave curvature along the longitudinal axis of said plate and a transverse concave curvature along the transverse axis of said plate;
a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, a respective one of said plurality of bone screw receiving holes located at each of said rounded lobes such that said plate has a first pair of said bone screw receiving holes located at said first end of said plate and corresponding to a first of the adjacent vertebral bodies, a second pair of said bone screw receiving holes corresponding to a second of the adjacent vertebral bodies, and a third pair of said bone screw receiving holes corresponding to a third of the adjacent vertebral bodies;
a locking element receiving opening positioned between said first pair of bone screw receiving holes, said locking element receiving opening surrounded by a recess in said plate concentric with said locking element receiving opening and overlapping a portion of said first pair of bone screw receiving holes, said recess having a central longitudinal axis offset from a transverse line passing through the central longitudinal axes of said first pair of bone screw receiving holes; and
a locking element positioned in said locking clement receiving opening and having a head positionable within said recess, said head having a top surface with a depression for engaging a tool used to lock and unlock said locking element to said plate, said head being configured so as to permit insertion of bone screws into said bone screw receiving holes when in a first unlocked position and to bear against at least a portion of the bone screw in said bone screw receiving holes when moved to a second locked position. - View Dependent Claims (127, 128, 129, 130, 131, 132, 133)
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- 134. An anterior cervical plate for engaging at least two vertebral bodies of a human cervical spine along the anterior aspect of the spine, said plate having a length sufficient to span at least two adjacent cervical vertebral bodies, said plate having a lower surface for contacting the cervical vertebral bodies and an upper surface opposite to said lower surface, said plate having a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, at least a first and second of said bone screw receiving holes being associated with a first of the cervical vertebral bodies, and a recess for retaining a locking element for locking bone screws in said bone screw receiving holes, said recess having a central longitudinal axis offset from a transverse line passing through the central longitudinal axes of said first and second bone screw receiving holes, and a locking element movably engageable in said recess, said locking element being movable from at least a first position to a second position, said locking element being configured so as to permit insertion of bone screws into each of said first and second bone screw receiving holes when said locking element is in said first position, said locking element having a head configured to bear against at least a portion of at least one of said bone screws in said first and second bone screw receiving holes when moved to said second position, said head having at least one segment removed therefrom, said removed segment having the same or greater radius of curvature as the radius of curvature of a corresponding one of said bone screw receiving holes.
- 154. An anterior cervical plate for engaging at least two vertebral bodies of a human cervical spine along the anterior aspect of the spine, said plate having a length sufficient to span at least two adjacent cervical vertebral bodies, said plate having a lower surface for contacting the cervical vertebral bodies and an upper surface opposite to said lower surface, said plate having a plurality of bone screw receiving holes extending through said plate from said upper surface to said lower surface, at least a first and second of said bone screw receiving holes being associated with a first of the cervical vertebrae, and a recess for retaining a locking element for locking bone screws in said bone screw receiving holes, said recess having a central longitudinal axis offset from a transverse line passing through the central longitudinal axes of said first and second bone screw receiving holes, and a locking element movably engageable in said recess, said locking element being movable from at least a first position to a second position, said locking element being configured so as to permit insertion of bone screws into each of said first and second bone screw receiving holes when said locking element is in said first position, said plate having an opening in the side wall of said bone screw receiving holes in communication with the side wall of said recess, said locking element having a plurality of projections to fit within said side wall openings so as to cover a portion of said bone screw receiving hole when said locking element is moved from said position to said second position.
Specification