Intervertebral disc prosthesis and method
First Claim
1. An intervertebral disc prosthesis for placement between first and second adjacent vertebrae, comprising:
- a first end member for contacting the first vertebra, said first end member having a first flat surface;
a second end member for contacting the second vertebra, said second end member having a first curved surface, wherein said second end member has a central axis and said first curved surface has a central axis and said central axes are not coaxial;
an intermediate member having an intermediate flat surface and an intermediate curved surface such that said intermediate flat surface coaptates with said first flat surface to provide at least two degrees of translational freedom and said intermediate curved surface coaptates with said first curved surface.
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Abstract
The present invention is directed to intervertebral prosthetic devices and methods. The intervertebral prosthetic devices and methods of the invention provides a variable instantaneous axis of rotation. In general, the disclosed devices include two bearing surfaces, a first bearing surface being curved and a second bearing surface being planar. In some embodiments, the curved bearing surface provides at least three degrees of rotational freedom and the planar bearing surface provides at least two degrees of translational freedom and one degree of rotational freedom. Several embodiments with varying degrees of rotational or translational freedom are disclosed.
1179 Citations
29 Claims
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1. An intervertebral disc prosthesis for placement between first and second adjacent vertebrae, comprising:
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a first end member for contacting the first vertebra, said first end member having a first flat surface;
a second end member for contacting the second vertebra, said second end member having a first curved surface, wherein said second end member has a central axis and said first curved surface has a central axis and said central axes are not coaxial;
an intermediate member having an intermediate flat surface and an intermediate curved surface such that said intermediate flat surface coaptates with said first flat surface to provide at least two degrees of translational freedom and said intermediate curved surface coaptates with said first curved surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An intervertebral prosthetic device for placement between first and second adjacent vertebrae, comprising:
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a first end piece for engaging said first vertebra;
a second end piece for engaging said second vertebra; and
a center piece which fits between said first and second end pieces, said center piece providing a variable instantaneous axis of rotation and including a curved surface and a flat surface such that between said first end piece and said flat surface of said center piece, said device can rotate around an axis oriented perpendicular to said flat surface, wherein said curved surface of said center piece is cylindrical or ellipsoidal. - View Dependent Claims (18, 19)
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20. An intervertebral prosthetic device for placement between first and second adjacent vertebrae, comprising:
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a first end piece for engaging said first vertebra;
a second end piece for engaging said second vertebra; and
a center piece which fits between said first and second end pieces, said center piece providing at least two degrees of linear translational freedom during vertebral rotation, wherein said first end piece comprises a flat surface having a raised perimeter edge. - View Dependent Claims (21)
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22. A non-compressible intervertebral disc device for placement between first and second adjacent vertebrae, comprising:
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a first bearing surface providing at least one degree of rotational freedom, wherein said first bearing surface is cylindrical or ellipsoidal;
a second bearing surface providing at least one degree of linear translational freedom and rotational freedom around an axis passing through said first and second bearing surfaces. - View Dependent Claims (23, 24)
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25. A non-compressible intervertebral disc device for placement between first and second adjacent vertebrae, comprising:
a first bearing surface, a second bearing surface providing a variable instantaneous axis of rotation and at least one degree of rotational freedom at each of said first and second bearing surfaces around an axis passed through said first and second bearing surfaces, at least one of said first and second bearing surfaces being cylindrical or ellipsoidal. - View Dependent Claims (26)
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27. A method for providing intervertebral mobility between adjacent first and second vertebrae comprising a step of:
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inserting into an intervertebral space between said adjacent first and second vertebrae a non-compressible prosthetic device having at least two degrees of translational freedom which provides a variable instantaneous axis of rotation, wherein said non-compressible prosthetic device comprises a first end piece for engaging said first vertebra;
a second end piece for engaging said second vertebra; and
a center piece which fits between said first and second end pieces, said center piece providing a variable instantaneous axis of rotation and including a curved surface and a flat surface such that between said first end piece and said flat surface of said center piece, said device can rotate around an axis oriented perpendicular to said flat surface, wherein said curved surface of said center piece is cylindrical or ellipsoidal.
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28. A method for providing intervertebral mobility between adjacent first and second vertebrae comprising a step of:
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inserting into an intervertebral space between said adjacent first and second vertebrae a non-compressible prosthetic device which provides at least two degrees of translational mobility between said adjacent vertebrae during rotation, wherein said non-compressible prosthetic device comprises a first end piece for engaging said first vertebra;
a second end piece for engaging said second vertebra; and
a center piece which fits between said first and second end pieces, said center piece providing a variable instantaneous axis of rotation and including a curved surface and a flat surface such that between said first end piece and said flat surface of said center piece, said device can rotate around an axis perpendicular to said flat surface, wherein said curved surface of said center piece is cylindrical or ellipsoidal.
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29. A method for providing intervertebral mobility between adjacent first and second vertebrae comprising a step of:
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inserting into an intervertebral space between said adjacent first and second vertebrae a non-compressible prosthetic device having a first bearing surface and a second bearing surface wherein said second bearing surface provides translational freedom in an anterior/posterior direction and in a lateral direction and said translational freedom is confined by a raised perimeter edge, wherein said non-compressible prosthetic device comprises a first end piece for engaging said first vertebra;
a second end piece for engaging said second vertebra; and
a center piece which fits between said first and second end pieces, said center piece providing a variable instantaneous axis of rotation and including a curved surface and a flat surface such that between said first end piece and said flat surface of said center piece, wherein said curved surface of said center piece is cylindrical or ellipsoidal.
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Specification