Intervertebral prosthesis
First Claim
1. An intervertebral prosthesis, comprising a first cover plate configured to be connected to a first vertebral body, a second cover plate configured to be connected to a second vertebral body, and a prosthesis core which forms an articulation with the second cover plate and is held by a seat of the first cover plate, which seat is designed as a guide device into which the core can be moved from a ventral side relative to the first cover plate, wherein the first cover plate has, on a ventral edge, a slide guide with respect to which a limit stop is displaceable between a locking position and a nonlocking position and has a height such that the limit stop does not interfere with relative motion between the prosthesis core and the second cover plate, and wherein the slide guide for the limit-stop plate is formed by a slide-guide surface extending transverse to an anterior-posterior direction on the ventral edge of the first cover plate and by a pivot pin projecting from the slide-guide surface and on which the limit-stop plate is pivotably mounted, and wherein the limit-stop plate has a tongue which, in a locking pivot position of the limit-stop plate, protrudes above the bottom surface of the first cover plate, and, in the nonlocking position, is lowered below the bottom surface of the first cover plate.
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Accused Products
Abstract
An intervertebral prosthesis, in particular for the cervical spine, includes a first cover plate to be connected to a first vertebral body, second cover plate to be connected to the second vertebral body, and a prosthesis core which forms an articulation with the second cover plate. The prosthesis core is held by seat of the first cover plate which is designed as a guide device. The core can be pushed into the guide device from the ventral side in the anterior-posterior (AP) direction relative to the first cover plate. A limit-stop plate is provided on the ventral edge of the first cover plate. This limit-stop plate is displaceable in a slide guide between a locking position and a nonlocking position.
58 Citations
17 Claims
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1. An intervertebral prosthesis, comprising a first cover plate configured to be connected to a first vertebral body, a second cover plate configured to be connected to a second vertebral body, and a prosthesis core which forms an articulation with the second cover plate and is held by a seat of the first cover plate, which seat is designed as a guide device into which the core can be moved from a ventral side relative to the first cover plate,
wherein the first cover plate has, on a ventral edge, a slide guide with respect to which a limit stop is displaceable between a locking position and a nonlocking position and has a height such that the limit stop does not interfere with relative motion between the prosthesis core and the second cover plate, and wherein the slide guide for the limit-stop plate is formed by a slide-guide surface extending transverse to an anterior-posterior direction on the ventral edge of the first cover plate and by a pivot pin projecting from the slide-guide surface and on which the limit-stop plate is pivotably mounted, and wherein the limit-stop plate has a tongue which, in a locking pivot position of the limit-stop plate, protrudes above the bottom surface of the first cover plate, and, in the nonlocking position, is lowered below the bottom surface of the first cover plate.
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3-12. -12. (canceled)
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16. An intervertebral prosthesis, comprising a first cover plate configured to be connected to a first vertebral body, a second cover plate configured to be connected to a second vertebral body, and a prosthesis core which forms an articulation with the second cover plate and is held by a seat of the first cover plate, which seat is designed as a guide device into which the core can be moved from a ventral side relative to the first cover plate,
wherein the first cover plate has, on a ventral edge, a slide guide with respect to which a limit stop is displaceable between a locking position and a nonlocking position and has a height such that the limit stop does not interfere with relative motion between the prosthesis core and the second cover plate, and wherein the intervertebral prosthesis further comprises a device for fixing the limit stop in the locking position.
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17. An intervertebral prosthesis, comprising a first cover plate configured to be connected to a first vertebral body, a second cover plate configured to be connected to a second vertebral body, and a prosthesis core which forms an articulation with the second cover plate and is held by a seat of the first cover plate, which seat is designed as a guide device into which the core can be moved from a ventral side relative to the first cover plate, the first cover plate having, on a ventral edge, a slide guide with respect to which a limit stop on the first cover plate is displaceable between a locking position and a nonlocking position and has a height such that the limit stop does not interfere with relative motion between the prosthesis core and the second cover plate;
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wherein the prosthesis core has an articulation surface that covers substantially the entire first cover plate; and
wherein the prosthesis core is also movable relative to the first cover plate in the anterior-posterior direction when the limit stop is located in the locking position.
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Specification