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US 2014/0277171 A1Published application
Spinal fixation system and method
AssigneeWarsaw Orthopedic, Inc.
InventorsEric C. Lange, Darren L. Davis
Life of this patent
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Abstract
A spinal fixation system includes a first plate, a post fixedly attached to the first plate and extending transverse therefrom. A second plate receives the distal end of the post. A locking mechanism is configured to restrict at least one of axial translation and/or orbital rotation of the second plate with respect to the post. The locking mechanism can include a locking nut having two non-concentric cylinders which enable an interference fit between the nut and the post, thus restricting axial translation of the second plate.
Claims20
A spinal fixation system, comprising:
- a first plate configured to be positioned to span between spinal processes of two adjacent vertebrae;
- a post having one end fixedly attached to the first plate and a distal second end;
- and
- a second plate positioned opposite said first plate and configured to receive the distal end of said post, said second plate being capable of at least axial translation along said post.
1 more element
A spinal fixation system, comprising:
- a first plate configured to be positioned on one side of two spinal processes of two adjacent vertebrae;
- a post having one end fixedly attached to the first plate and a distal second end;
- a second plate positioned on an opposite side of the two spinal processes and being configured to receive the distal end of said post, said second plate being capable of at least axial translation along said post;
- and
- a locking mechanism cooperative with said post and said second plate to lock and restrict at least one of axial translation and orbital rotation of said second plate with respect to said post.
2 more elements
A spinal fixation system comprising:
- a first plate configured to be positioned on one side of two spinal processes of two adjacent vertebrae, said first plate having a plurality of spikes for securing the first plate in position against the two spinal processes;
- a cylindrical cross-section post having one end fixedly attached to the first plate and a distal second end;
- a second plate positioned on an opposite said of the two spinal processes and being configured to receive the distal end of said post, said second plate being capable of at least axial translation along said post and having a plurality of spikes for securing the second plate in position against the two spinal processes;
- a locking nut configured to restrict translation of the second plate along the post, the locking nut comprising:
- an inner cylinder having a central bore having central axis, and
- an outer cylinder having a central bore having a central axis, wherein said central bore of said inner cylinder is non-concentric with the central bore of said outer cylinder, said outer cylinder having a proximal nut for rotating the outer cylinder and a removal nut for enabling removal of the locking nut from the post;
- and
- a break off feature configured to control applied torque to lock the second plate to the post;
- wherein the central axes of the inner cylinder and outer cylinder are initially aligned to receive the post, and wherein rotation of the outer cylinder causes the central axes of the inner and outer cylinders to un-align and results in an interference fit between the locking nut and the post.
6 more elements
The spinal fixation system as recited in claim 19, further comprising:
- an orbital rotation locking system cooperative with said second plate and said post to restrict orbital rotation of said second plate with respect to said post;
- and
A method for correction of a spine disorder, the method comprising the steps of:
- providing access to a surgical site at a selected section of a spine;
- providing a spinal fixation system including
- a first plate configured to be positioned on one side of two spinal processes of two adjacent vertebrae;
- a post having one end fixedly attached to the first plate and a distal second end;
- a second plate positioned on an opposite side of the two spinal processes and being configured to receive the distal end of said post, said second plate being capable of at least axial translation along said post;
- and
- a locking mechanism cooperative with said post and said second plate to lock and restrict at least one of axial translation and orbital rotation of said second plate with respect to said post.
- positioning the first plate against the two spinal processes;
- positioning the second plate onto the post;
- adjusting an axial position of the second plate along the post;
- adjusting an orbital rotation position of the second plate with respect to said post;
- and
- locking the axial translation and orbital rotation position using the locking mechanism.
10 more elements
Dependencies are inferred from the claim text.