Intervertebral disk prosthesis
First Claim
1. A vertebral disk prosthesis structured to be disposed adjacent to at least one vertebral body, said vertebral body having a periphery, said vertebral disk prosthesis comprising:
- at least one contacting member including a top endplate and a bottom endplate and having at least two movable lateral portions, said lateral portions coupled to each other;
the top endplate structured to engage a first vertebral body and the bottom endplate structured to engage a second vertebral body, wherein the top and bottom endplates are pivotally connected for allowing the adjacent vertebral bodies to pivot with respect to each other when the endplates are engaged with the vertebral bodies;
said lateral portions movable between;
a contracted position in which the lateral portions are disposed such that the member has a first lateral width, said first lateral width being smaller than the lateral width of a vertebral body of a patient; and
an expanded position in which the lateral portions are disposed such that the contacting member has a second lateral width that is larger than the first lateral width, and said at least one axial end surface is configured for supporting and abutting the periphery of the vertebral body, the second lateral width being sufficient for the axial end surface on the lateral portions to support and abut said periphery at opposite lateral sides of the vertebral body;
an expansion member disposed between said lateral portions and configured for moving said lateral portions between the contracted position and the expanded position; and
a bushing that comprises a gel disposed and in supportive association between said top and bottom endplates.
3 Assignments
0 Petitions
Accused Products
Abstract
A vertebral disk prosthesis with at least one member that has lateral portions coupled to each other and structured to move between contracted and expanded positions. In the contracted position, the member has a first lateral width and the end surface is narrower than the lateral width of a vertebral body of a patient. In the expanded position, the lateral portions are disposed such that the member has a second lateral width that is larger than the first lateral width and the axial end surface is configured for supporting and abutting the periphery of the body at least on both the lateral sides thereof. An expansion member is disposed between the lateral portions and configured for moving the lateral portions to the expanded position. The prosthesis is preferably also axially expandable. A method and tool for inserting the intervertebral disk prostheses are also provided.
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Citations
40 Claims
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1. A vertebral disk prosthesis structured to be disposed adjacent to at least one vertebral body, said vertebral body having a periphery, said vertebral disk prosthesis comprising:
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at least one contacting member including a top endplate and a bottom endplate and having at least two movable lateral portions, said lateral portions coupled to each other;
the top endplate structured to engage a first vertebral body and the bottom endplate structured to engage a second vertebral body, wherein the top and bottom endplates are pivotally connected for allowing the adjacent vertebral bodies to pivot with respect to each other when the endplates are engaged with the vertebral bodies;said lateral portions movable between; a contracted position in which the lateral portions are disposed such that the member has a first lateral width, said first lateral width being smaller than the lateral width of a vertebral body of a patient; and an expanded position in which the lateral portions are disposed such that the contacting member has a second lateral width that is larger than the first lateral width, and said at least one axial end surface is configured for supporting and abutting the periphery of the vertebral body, the second lateral width being sufficient for the axial end surface on the lateral portions to support and abut said periphery at opposite lateral sides of the vertebral body; an expansion member disposed between said lateral portions and configured for moving said lateral portions between the contracted position and the expanded position; and a bushing that comprises a gel disposed and in supportive association between said top and bottom endplates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 17, 18, 19, 20)
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13. A vertebral disk prosthesis, comprising:
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a top endplate configured to supportively engage a first vertebral body; and a bottom endplate configured to supportively engage a second vertebral body, wherein the top and bottom endplates are pivotally connected for allowing the adjacent vertebral bodies to pivot with respect to each other when the endplates are engaged therewith; wherein each endplate comprises; lateral portions connected to each other for movement in vertebral lateral directions between; a contracted position in the implantation configuration, in which the body of said at least one member has a first lateral width and the end surface is narrower than the lateral width of a vertebral body of a patient, an expanded position in the implanted configuration, in which the lateral portions are disposed such that said at least one member has a second lateral width that is larger than the first lateral width, and in which the axial end surface is configured for supporting and abutting the body; and an axial portion configured for moving with respect to the lateral portions in a vertebral axial direction away from the other of the endplates from; a retracted position in the implantation configuration, in which the prosthesis has a first axial height, and to an extended position in the implanted configuration, in which the prosthesis has a second axial height that is greater than the first axial height. - View Dependent Claims (14, 15, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification