Ceramic vertebrae prosthesis
First Claim
1. A ceramic vertebra prosthesis to be inserted in a cavity defined between upper and lower vertebra bodies with a removed intervertebral disk or disks, said vertebra prosthesis comprising a ceramic having a porosity of 20 to 55%, wherein the vertebra prosthesis is provided with upper and lower convex contact surfaces that are adapted to come into contact with upper and lower vertebra bodies, each of said upper and lower convex contact surfaces comprises a curved surface whose curvature in a section in a direction perpendicular to a direction of insertion of said vertebra prosthesis into the cavity between the upper and lower vertebra bodies is different than in a direction parallel to the direction of insertion of the vertebra prosthesis;
- wherein said prosthesis comprises calcium phosphate ceramic;
wherein a width of said prosthesis decreases in a direction toward an insertion end of said prosthesis; and
wherein said width of said prosthesis is greatest at a point disposed between a center and an end opposite said insertion end of said prosthesis.
1 Assignment
0 Petitions
Accused Products
Abstract
A ceramic vertebrae prosthesis to be inserted in a cavity defined between upper and lower vertebra bodies with a removed intervertebral disk or disks is provided with upper and lower convex contact surfaces that come into contact with the upper and lower vertebra bodies.
645 Citations
21 Claims
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1. A ceramic vertebra prosthesis to be inserted in a cavity defined between upper and lower vertebra bodies with a removed intervertebral disk or disks, said vertebra prosthesis comprising a ceramic having a porosity of 20 to 55%, wherein the vertebra prosthesis is provided with upper and lower convex contact surfaces that are adapted to come into contact with upper and lower vertebra bodies, each of said upper and lower convex contact surfaces comprises a curved surface whose curvature in a section in a direction perpendicular to a direction of insertion of said vertebra prosthesis into the cavity between the upper and lower vertebra bodies is different than in a direction parallel to the direction of insertion of the vertebra prosthesis;
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wherein said prosthesis comprises calcium phosphate ceramic; wherein a width of said prosthesis decreases in a direction toward an insertion end of said prosthesis; and wherein said width of said prosthesis is greatest at a point disposed between a center and an end opposite said insertion end of said prosthesis. - View Dependent Claims (2)
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3. A ceramic cervical vertebra prosthesis for multiple vertebra bodies to be inserted in a cavity formed by resecting a plurality of continuous cervical vertebrae, said vertebra prosthesis comprising:
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a ceramic having a porosity of 30 to 45%, wherein the vertebra prosthesis is provided with an outwardly arched front surface corresponding to front surfaces of the removed vertebra bodies and upper and lower convex contact surfaces that are adapted to come into contact with the corresponding upper and lower vertebra bodies; and wherein a contour of said outwardly arched front surface protrudes outwardly with respect to a plane defined by a direction of insertion of said vertebra prosthesis and an axis of alignment of the plurality of continuous cervical vertebrae prior to resection. - View Dependent Claims (4, 5, 6)
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7. A ceramic vertebra prosthesis adapted to be inserted in a cavity defined between upper and lower vertebra bodies upon removal of an intervertebral disk or disks, said vertebra prosthesis comprising a ceramic having a porosity of 20 to 55%, wherein the vertebra prosthesis is provided with upper and lower convex contact surfaces that are adapted to come into contact with upper and lower vertebra bodies, each of said upper and lower convex contact surfaces comprising a curved surface whose curvature in a section in a direction perpendicular to a direction of insertion of said vertebra prosthesis into the cavity between the upper and lower vertebra bodies is different than in a direction parallel to the direction of insertion of the vertebra prosthesis;
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wherein a width of said prosthesis is greatest at a point disposed between a center and an end opposite of an insertion end of said prosthesis. - View Dependent Claims (8, 9, 10)
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11. A cervical vertebra prosthesis for multiple cervical bodies to be inserted in a cavity formed by resecting a plurality of continuous cervical bodies, said vertebra prosthesis comprising:
a substantially rigid body having a length adapted to replace a cavity formed by resecting at least one cervical vertebra and two cervical disks adjacent thereto, said substantially rigid body provided with an outwardly arched anterior surface corresponding to the anterior contour of a portion of the cervical curve defined by anterior surfaces of the removed cervical vertebra body or bodies and cervical disks. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A prosthesis adapted to be inserted in a cavity defined by removal of an intervertebral disk, said prosthesis comprising:
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a body having convex superior and inferior contact surfaces adapted to come into contact with upper and lower vertebra bodies, each of said upper and lower convex contact surfaces comprising a curved surface whose curvature in a frontal section of said prosthesis is different than in a sagittal section of said prosthesis; and wherein a width of said sagittal section of said prosthesis is greatest along a line posterior to a center of said sagittal section. - View Dependent Claims (19, 20, 21)
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Specification