Articular disc prosthesis and method for implanting the same
First Claim
1. An articular disc prosthesis for disposition between a first vertebra and a second vertebra, comprising:
- a first articular component including a first bearing surface adapted to engage the first vertebra; and
a second articular component including second bearing surface adapted to engage the second vertebra, said first and second bearing surfaces defining a space therebetween; and
wherein at least one of said first and second articular components includes a concave articular surface that cooperates with a corresponding convex articular surface to provide articulating motion between the first and second articular components, at least a portion of said concave articular surface positioned beyond said space.
2 Assignments
0 Petitions
Accused Products
Abstract
An articular disc prosthesis and method of implanting the same within an intervertebral space between adjacent vertebral bodies. The prosthesis includes a pair of articular components and an articular ball disposed therebetween. Each of the articular components includes an outer shell portion and a removable inner insert portion. The insert portion includes a concave articular surface sized and shaped to receive a portion of the articular ball to provide articulating motion between the articular components. The outer shell portion includes a central hemi-cylindrical portion, a pair of laterally extending flanges, and an axially extending lip. Following removal of the natural intervertebral disc, a pair of hemi-cylindrical recesses are formed along a central region of the adjacent vertebral bodies to a predetermined depth. The prosthesis is implanted within the prepared disc space by axially displacing the hemi-cylindrical central portions of the articular components along the hemi-cylindrical recesses in the vertebral bodies. The lateral flanges and the axial lip of the articular components bear against the endplates of the adjacent vertebral bodies to stabilize the prosthesis and to prevent subsidence.
344 Citations
28 Claims
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1. An articular disc prosthesis for disposition between a first vertebra and a second vertebra, comprising:
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a first articular component including a first bearing surface adapted to engage the first vertebra; and
a second articular component including second bearing surface adapted to engage the second vertebra, said first and second bearing surfaces defining a space therebetween; and
wherein at least one of said first and second articular components includes a concave articular surface that cooperates with a corresponding convex articular surface to provide articulating motion between the first and second articular components, at least a portion of said concave articular surface positioned beyond said space. - View Dependent Claims (2, 3, 4)
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5. An articular disc prosthesis for replacement of a natural intervertebral disc, comprising:
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a first articular component defining a first concave articular surface;
a second articular component defining a second concave articular surface; and
an articular ball positioned between said first and second concave articular surfaces to provide articulating motion between the first and second articular components, said articular ball having a diameter greater than a height of the natural intervertebral disc.
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6. An articular disc prosthesis for disposition between a first vertebra and a second vertebra, comprising:
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a first articular component adapted to engage the first vertebra; and
a second articular component adapted to engage the second vertebra; and
wherein each of said first and second articular components extends along an axis and includes a central axial portion defining a convex lateral curvature and a pair of flanges extending laterally from said central axial portion in generally opposite directions. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An articular disc prosthesis for disposition between a first vertebra and a second vertebra, comprising:
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a first modular articular component; and
a second modular articular component; and
wherein each of said first and second modular articular components includes;
an outer shell portion configured to engage a corresponding one of the first and second vertebrae; and
an inner insert portion removably engaged with the outer shell portion, said inner insert portion including an articular surface cooperating with a corresponding articular surface to provide articulating motion between said first and second modular articular components. - View Dependent Claims (18, 19, 20, 21)
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22. A method of implanting an articular disc prosthesis between first and second vertebrae, comprising:
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providing an articular disc prosthesis having a first articular component adapted to engage a first vertebra and a second articular component adapted to engage a second vertebra, each of the first and second articular components extending along an axis and including a central axial portion defining a convex lateral curvature and a pair of flanges extending laterally from the central axial portion in generally opposite directions;
removing at least a portion of a natural interverterbral disc from between the first and second vertebrae to form an intervertebral space;
forming an elongate recess along a central region of each of the first and second vertebrae; and
implanting the articular disc prosthesis within the intervertebral space by inserting the central axial portions of the first and second articular components within the elongate recesses of the first and second vertebrae. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification