Intervertebral prosthetic disc
First Claim
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1. An intervertebral prosthetic disc for insertion between adjacent vertebrae, the disc comprising:
- upper and lower plates having outer surfaces locatable against the respective vertebrae, inner curved surfaces, and lateral portions;
a core between the plates, the core having upper and lower curved surfaces complementary in shape to the inner, curved surfaces of the plates to allow the plates to slide over the upper and lower surfaces of the core;
wherein at least one of the curved surfaces of the plates and at least one of the curved surfaces of the core include annular formations which cooperate with one another to retain the core between the plates when the plates slide over the upper and lower surfaces of the core, such formations including an annular recess and an annular projection received by the recess; and
wherein the lateral portions of the upper and lower plates are adapted to contact one another during sliding movement of the plates over the core.
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Abstract
A prosthetic disc for insertion between adjacent vertebrae includes upper and lower plates, a core disposed between the plates, and at least one projection extending from at least one of the upper and lower curved surfaces of the core into at least one recess of one of the inner surfaces of the plates. The recess is oversize with respect to the projection to allow sliding movement of the plate over the core while retaining the core between the plates during such sliding movement. The projection(s) may include a rod extending through an axial hole in the core, multiple surface features of the core, or the like.
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Citations
22 Claims
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1. An intervertebral prosthetic disc for insertion between adjacent vertebrae, the disc comprising:
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upper and lower plates having outer surfaces locatable against the respective vertebrae, inner curved surfaces, and lateral portions; a core between the plates, the core having upper and lower curved surfaces complementary in shape to the inner, curved surfaces of the plates to allow the plates to slide over the upper and lower surfaces of the core; wherein at least one of the curved surfaces of the plates and at least one of the curved surfaces of the core include annular formations which cooperate with one another to retain the core between the plates when the plates slide over the upper and lower surfaces of the core, such formations including an annular recess and an annular projection received by the recess; and wherein the lateral portions of the upper and lower plates are adapted to contact one another during sliding movement of the plates over the core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An intervertebral prosthetic disc for insertion between adjacent vertebrae, the disc comprising:
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upper and lower plates having outer surfaces locatable against the respective vertebrae, inner curved surfaces, and lateral portions, wherein at least one of the inner curved surfaces of the plates comprises an inwardly directed annular rib; a core between the plates, the core having upper and lower curved surfaces complementary in shape to the inner, curved surfaces of the plates to allow the plates to slide over the core, wherein at least one of the upper and lower curved surfaces of the core comprises an annular channel adapted to receive the annular rib; wherein the annular rib cooperates with the annular channel to retain the core between the plates when the plates slide over the core; and wherein the lateral portions of the upper and lower plates are adapted to contact one another during sliding movement of the plates over the core. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification