Intervertebral prosthetic device
First Claim
1. An intervertebral prosthetic device for replacement of a nucleus pulposus of an intervertebral disc, comprising:
- a first intravertebral fixation member for fixation within a cavity of a first vertebral body, said first fixation member having a bone-contacting surface for positioning against subchondral bone of the first vertebral body;
said first fixation member having at least one adjustable member for adjusting the length thereof;
a second intravertebral fixation member for fixation within a cavity of a second vertebral body adjacent the first vertebral body, said second fixation member having a bone-contacting surface for positioning against subchondral bone of the second vertebral body; and
a compressible member for positioning between said first fixation member and said second fixation member, said compressible member having a top plate connected to said first fixation member, a bottom plate connected to said second fixation member, and at least one compressible element therebetween that remains compressible after implantation, said compressible member further having an outer periphery less than or substantially equal to a diameter of the nucleus pulposus of the intervertebral disc.
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Accused Products
Abstract
An intervertebral prosthetic device for replacement of an intervertebral disc includes a first fixation member for fixation within a first vertebral body and a second fixation member for fixation within a second vertebral body adjacent the first vertebral body. The present prosthetic device also includes a compressible member for positioning between the first and second fixation members. The compressible member has an outer periphery less than or substantially equal to a diameter of a nucleus pulposus of the intervertebral disc. The compressible member thus essentially fits within the annulus fibrosis of the intervertebral disc. The compressible member also has at least one spring that can be pre-loaded to place the annulus fibrosis under tension and to reproduce the mechanical properties of a natural disc.
633 Citations
43 Claims
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1. An intervertebral prosthetic device for replacement of a nucleus pulposus of an intervertebral disc, comprising:
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a first intravertebral fixation member for fixation within a cavity of a first vertebral body, said first fixation member having a bone-contacting surface for positioning against subchondral bone of the first vertebral body;
said first fixation member having at least one adjustable member for adjusting the length thereof;a second intravertebral fixation member for fixation within a cavity of a second vertebral body adjacent the first vertebral body, said second fixation member having a bone-contacting surface for positioning against subchondral bone of the second vertebral body; and a compressible member for positioning between said first fixation member and said second fixation member, said compressible member having a top plate connected to said first fixation member, a bottom plate connected to said second fixation member, and at least one compressible element therebetween that remains compressible after implantation, said compressible member further having an outer periphery less than or substantially equal to a diameter of the nucleus pulposus of the intervertebral disc. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An intervertebral prosthetic device for replacement of a nucleus pulposus of an intervertebral disc, comprising:
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a first intravertebral fixation member for fixation within a cavity of a first vertebral body, said first fixation member having an adjustable member and a support member, said adjustable member having a bone-contacting portion, an other portion for positioning against said support member, and at least one adjustment element for adjusting a distance between said bone-contacting portion and said other portion; a second intravertebral fixation member for fixation within a cavity of a second vertebral body adjacent the first vertebral body; and a compressible member positioned between said first fixation member and said second fixation member, said compressible member remaining compressible after implantation and being dimensioned to operably replace the nucleus pulposus of the intervertebral disc. - View Dependent Claims (10, 11, 12)
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13. An intervertebral prosthetic device for replacement of a nucleus pulposus of an intervertebral disc, comprising:
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a first intravertebral fixation member for fixation within a cavity of a first vertebral body and having a first longitudinal axis and at least one adjustment element that adjusts a length dimension of said first fixation member along said first longitudinal axis; a second intravertebral fixation member for fixation within a cavity of a second vertebral body adjacent the first vertebral body; and a compressible member positioned between said first fixation member and said second fixation member and that remains compressible after implantation at the site of the replaced nucleus pulposus of the intervertebral disc. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 43)
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41. A method of intervertebral disc replacement between a superior vertebra and an adjacent inferior vertebra in a spine, said method comprising:
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excising a nucleus pulposus of an intervertebral disc while leaving intact an annulus fibrosis of the intervertebral disc; performing partial vertebrectomies on the superior vertebra and the inferior vertebra; implanting an inferior fixation member into a body of the inferior vertebra; connecting a compressible member to said inferior fixation member; implanting a superior fixation member into the superior vertebra and connecting said compressible member to said superior fixation member, at least one of said superior fixation member and said inferior fixation member being adjustable in a direction substantially parallel to the spine; and adjusting said at least one of said superior fixation member and said inferior fixation member to pre-load said compressible member.
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42. An intervertebral prosthetic device for replacement of a nucleus pulposus of an intervertebral disc, comprising:
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a first fixation member having a first portion for positioning against subchondral bone within a cavity of a first vertebral body, a second portion opposite said first portion, and a telescopic element extending between said first portion and said second portion to adjust a length dimension of said first fixation member; a second fixation member having a bone-contacting portion for positioning against subchondral bone of a second vertebral body that is adjacent the first vertebral body; and a compressible member positioned between said second portion of said first fixation member and said second fixation member, said compressible member having at least one compressible element that compresses and expands in response to adjustment of said first fixation member.
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Specification