Anti-rotation fixation element for spinal prostheses
AssigneeArchus Orthopedics, Inc.
InventorsLeonard Tokish, Mark Charbonneau, Mark Reiley, Robert Scribner
Life of this patent
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Abstract
Prostheses, systems, and methods are provided for replacement of natural facet joints between adjacent vertebrae with vertebral prostheses. A portion of the vertebral prosthesis includes anti-rotation and/or anti-pullout elements to prevent or reduce prosthesis fastener rotation or pull out as a result of torques applied to the prosthesis. Various tools and methods aid the process of surgically adding the vertebral prosthesis to a patient's vertebra.
Claims136
A vertebral prosthesis, comprising:
- a first bearing element shaped to form a facet joint with a second bearing element;
- and
- a first fixation element adapted to be coupled to the first bearing element, the first fixation element adapted to be inserted into one or more holes in a vertebra, the first fixation element including:
- an anti-rotation element coupled to at least a portion of the vertebra defining the one or more holes in the vertebra, the anti-rotation element being adapted to resist a rotational force from causing rotation of the first fixation element within a hole in the vertebra.
A vertebral prosthesis, comprising:
- a first bearing element shaped to form a facet joint with a second bearing element;
- and
- a first fixation element coupled to the first bearing element, the first fixation element inserted into one or more holes in a vertebra, the first fixation element shaped to resist a rotational force from causing rotation of the first fixation element within at least one of the one or more holes in the vertebra.
A vertebral prosthesis method, comprising:
- coupling a first bearing element to a first fixation element, the first bearing element shaped to form a facet joint with a second bearing element;
- coupling an anti-rotation element to the first fixation element, the anti-rotation element being adapted to resist a rotational force from causing rotation of the first fixation element within at least one of the one or more holes in the vertebra;
- and
- inserting the first fixation element at least partly into one or more holes in a vertebra.
A method for vertebral prosthesis preparation, comprising:
- perforating a vertebra with at least a first hole, the first hole shaped to receive a prosthetic fixation element;
- supporting a perforation guide with a guide support stabilized at least partly by a portion of the vertebra defining at least the first hole;
- guiding a perforation tool with the perforation guide;
- and
- perforating the vertebra with at least a second hole aligned by the perforation guide, the second hole shaped to receive a first prosthetic anti-rotation element.
A vertebral prosthesis tool, comprising:
- a guide support stabilized at least partly by a portion of a vertebra defining at least a first hole shaped to receive a prosthetic fixation element of a vertebral prosthesis, the vertebral prosthesis forming a facet joint with a second vertebral prosthesis;
- and
- a perforation guide coupled to the guide support, the perforation guide guiding a perforation tool to perforate the vertebra with at least a second hole aligned by the perforation guide, the second hole shaped to receive a prosthetic anti-rotation element of the vertebral prosthesis.
A vertebral prosthesis fastener for securing at least a portion of prosthesis to one of adjoining vertebrae, comprising:
- a body having a distal end that includes at least one separable member, the at least one separable member positionable between a stowed configuration and a deployed configuration;
- at least one ridge formed along the surface of the at least one separable member, the at least one ridge being adapted to engage with a vertebrae so as to counteract a force generated by the relative movement between the adjoining vertebrae.
A vertebral prosthesis, comprising:
- a first bearing element shaped to form a facet joint with a second bearing element;
- and
- a first fixation element coupled to the first bearing element, the first fixation element adapted for insertion into a hole formed in a vertebra, the first fixation element including an anti-rotation element adapted to engage with at least a portion of the vertebra when disposed within a hole formed in a vertebra and to resist a rotational force from causing rotation of the first fixation element relative to the vertebra.
A vertebral prosthesis, comprising:
- a first bearing element shaped to form a facet joint with a second bearing element;
- and
- a first fixation element adapted to be coupled to the first bearing element, the first fixation element adapted to be inserted into one or more holes in a vertebra and having a moment arm perpendicular to the axis of the fixation element, the first fixation element including:
- an anti-rotation element coupled to at least a portion of the vertebra defining the one or more holes in the vertebra, the anti-rotation element being adapted to resist a rotational force generated by the moment arm from causing rotation of the first fixation element relative to the vertebra.
A vertebral prosthesis according to any of clams 128 to 133 further comprising an anti-pull out element.
Dependencies are inferred from the claim text.