Prosthetic Intervertebral Discs
First Claim
Patent Images
1. In combination, a prosthetic intervertebral disc and intervertebral stabilization device comprising:
- the prosthetic intervertebral disc configured to be placed between two adjacent vertebrae and replace a natural disc, comprising;
a first endplate;
a second endplate attached either directly or indirectly to said first endplate separated by a first distance; and
a compressible core member positioned between said first and second endplates, the compressible core member being expandable between a contracted condition and an expanded condition, said first distance being greater in said expanded condition than in said contracted condition, andthe intervertebral stabilization member comprisingan upper fixation member affixable to an upper vertebral member,a lower fixation member affixable to a lower vertebral member,a compressible fluid member containing a fluid chamber extending between and attached to the upper fixation member and the lower fixation member, anda fluid communication channelproviding fluid flow between the prosthetic disc compressible core member and the fluid chamber of the compressible fluid member.
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Accused Products
Abstract
Prosthetic intervertebral discs, systems including such prosthetic intervertebral discs, and methods for using the same are described. The subject prosthetic discs include upper and lower endplates separated by a compressible core member. The subject prosthetic discs exhibit stiffness in the vertical direction, torsional stiffness, bending stiffness in the sagittal plane, and bending stiffness in the front plane, where the degree of these features can be controlled independently by adjusting the components, construction, and other features of the discs.
77 Citations
81 Claims
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1. In combination, a prosthetic intervertebral disc and intervertebral stabilization device comprising:
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the prosthetic intervertebral disc configured to be placed between two adjacent vertebrae and replace a natural disc, comprising; a first endplate; a second endplate attached either directly or indirectly to said first endplate separated by a first distance; and a compressible core member positioned between said first and second endplates, the compressible core member being expandable between a contracted condition and an expanded condition, said first distance being greater in said expanded condition than in said contracted condition, and the intervertebral stabilization member comprising an upper fixation member affixable to an upper vertebral member, a lower fixation member affixable to a lower vertebral member, a compressible fluid member containing a fluid chamber extending between and attached to the upper fixation member and the lower fixation member, and a fluid communication channel providing fluid flow between the prosthetic disc compressible core member and the fluid chamber of the compressible fluid member. - View Dependent Claims (2, 3, 4, 5)
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6. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a substantially cylindrical, compressible core member having a longitudinal axis and a diameter, the core member positioned between the first and second endplates with the diameter contacting the first and second endplates. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a core structure comprising a plurality of compressible core members, each core member configured to provide different load bearing properties from the other and to provide a varying center of rotation to the disc. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A prosthetic assemblage, posteriorly insertable to an intervertebral site in a spine, comprising:
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a left prosthetic disc comprising an upper endplate, a lower endplate, a compressible anterior core member, and a compressible posterior core member, and a right prosthetic disc comprising an upper endplate, a lower endplate, a compressible anterior core member, and a compressible posterior core member. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a compressible core member having regions of different compressibility. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a compressible core member having exterior wrapping. - View Dependent Claims (42, 43, 44, 45)
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46. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a compressible core member situated between the first and second endplates, the core member further comprising an expandable element adjustably expanding the compressible core member. - View Dependent Claims (47, 48)
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49. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a compressible core member situated between the first and second endplates, the compressible core member having first and second ends respectively adjacent the first and second endplates, the compressible core member further comprising having multiple furrows in the first and second ends suitable for allowing passage of gaseous sterilant through the furrows. - View Dependent Claims (50, 51)
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52. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; and a compressible core member situated between the first and second endplates, the compressible core member having first and second ends respectively adjacent the first and second endplates, the compressible core member further comprising an integrated mesh providing a plurality of non-geometric raised portions providing unoccupied space between the core member and each of the first and second endplates suitable for allowing passage of gaseous sterilant between the core member and each of the first and second endplates. - View Dependent Claims (53)
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54. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; a compressible core member situated between the first and second endplates, the compressible core member having first and second ends respectively adjacent the first and second endplates, wherein the first and second endplates have a curved profile configured for implantation into an intervertebral space situated between two adjacent vertebrae via a posterior approach, and each first and second endplate further comprising two parallel keels configured to attach the prosthetic intervertebral disc to the vertebrae adjacent the intervertebral space. - View Dependent Claims (55)
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56. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; a core structure comprising at least one compressible core member, and wherein each endplate comprises an inner endplate member having a periphery and having peripheral wings extending radially from that periphery and an outer endplate having mating recesses configured to receive and retain the peripheral wings of the inner endplate. - View Dependent Claims (57)
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58. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate; and a core structure comprising at least one compressible core member having a periphery, and further comprising a plurality of fiber layers extending outwardly from the compressible core member, and wherein fibers comprising each fiber layer have a stiffness different than the fibers in each other layer and extend between and are connected to the first endplate and the second endplate. - View Dependent Claims (59, 60)
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- 61. An endplate configured to be attached, directly or indirectly to another endplate, and form with a compressible core member, a prosthetic vertebral disc, wherein the endplate has a peripheral surface and a surface configured to be placed adjacent a surface on a vertebral bone, and wherein the endplate further comprises a plurality of anchoring spikes extendible from the peripheral surface and into vertebral bone after the endplate has been introduced adjacent a vertebral bone.
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64. A prosthetic intervertebral disc comprising:
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a first endplate; a second endplate attached either directly or indirectly to the first endplate; a core structure comprising at least one compressible core member, and a retention mechanism extending between the first and second endplates and configured to compress the disc to a height that is reduced relative to its operational height. - View Dependent Claims (65, 66, 67)
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68. A prosthetic intervertebral disc comprising:
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a first endplate having a surface contacting a compressible core member and a plurality of projections extending into that compressible core member; a second endplate having a surface contacting a compressible core member and a plurality of projections extending into that compressible core member; that compressible core member situated between the first and second endplates and having openings extending into the core member and accepting plurality of projections from the first and second endplates. - View Dependent Claims (69, 70)
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- 71. A pair of interlockable prosthetic disc implants configured to be placed together within a space between adjacent vertebrae wherein the discs comprise cooperative interlocking mechanisms configured to align the interlockable prosthetic disc implants together within the intervertebral space.
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76. A kit for introducing prosthetic disc implants posteriorly into an intervertebral space between adjacent vertebrae comprising:
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two intervertebral implants each comprising a first endplate, a second endplate, at least one core member extending between and attached to the first and second endplates, and wherein each endplate includes a guide channel, and two guidewires for passage through the guide channels in the first and second endplates. - View Dependent Claims (77, 78, 79, 80, 81)
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Specification