Variable height vertebral implant
First Claim
1. A height-variable vertebral body implant comprising:
- a first, essentially U-shaped or C-shaped cage including vertebral support surfaces;
wherein the first cage is an inner cage, which is embraced and guided in a telescopic manner by a second, outer U-shaped or C-shaped cage including vertebral support surfaces, and wherein legs of the first and the second cages are aligned such that a continuous lateral opening is obtained, and the first and the second cages are configured to be mutually fixed in a predetermined final position,wherein at least one of frontal sides of each the first and second cages include at least one of the vertebral support surfaces and webs and tooth-like locking projections extending in a longitudinal direction, and the legs of the first and the second cages each comprise, on leg ends, an inwardly directed stability-increasing curved portion, with the first cage including an elongated hole extending in the longitudinal direction and including a unilateral toothing, wherein in cooperation with an instrument comprising a complementary toothing, a relative movement and an adjustment between the cages is effected.
1 Assignment
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Accused Products
Abstract
A height-variable vertebral body implant having a first, essentially U-shaped or C-shaped cage, and vertebral support surfaces formed on the first cage. The first cage is an inner cage, which is embraced and guided in a telescopic manner by a second, outer U-shaped or C-shaped cage. Further, legs of the inner and the outer cage are aligned such that a continuous lateral opening is obtained, and the inner and the outer cages are mutually fixed in a predetermined final position. The inner cage includes in an area of a part connecting the legs a longitudinally extending elongated hole having a unilateral toothing. In cooperation with an instrument including a complementary toothing, a relative movement and adjustment may be effected between the cages. In addition, a thread bore is formed in the outer cage in a position below the area of the elongated hole to fix a desired adjustment position.
147 Citations
16 Claims
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1. A height-variable vertebral body implant comprising:
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a first, essentially U-shaped or C-shaped cage including vertebral support surfaces; wherein the first cage is an inner cage, which is embraced and guided in a telescopic manner by a second, outer U-shaped or C-shaped cage including vertebral support surfaces, and wherein legs of the first and the second cages are aligned such that a continuous lateral opening is obtained, and the first and the second cages are configured to be mutually fixed in a predetermined final position, wherein at least one of frontal sides of each the first and second cages include at least one of the vertebral support surfaces and webs and tooth-like locking projections extending in a longitudinal direction, and the legs of the first and the second cages each comprise, on leg ends, an inwardly directed stability-increasing curved portion, with the first cage including an elongated hole extending in the longitudinal direction and including a unilateral toothing, wherein in cooperation with an instrument comprising a complementary toothing, a relative movement and an adjustment between the cages is effected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A height-variable vertebral body implant system comprising:
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a first essentially U-shaped or C-shaped cage including vertebral support surfaces; wherein the first cage is an inner cage, which is embraced and guided in a telescopic manner by a second outer U-shaped or C-shaped cage including vertebral support surfaces, and wherein legs of the first and the second cage are aligned such that a continuous lateral opening is obtained, and the first and the second cages are configured to be mutually fixed in a predetermined final position, wherein at least one of frontal sides of each of the first and second cages include the vertebral support surfaces and webs and tooth-like locking projections extending in a longitudinal direction, and the legs of the first and the second cages each comprise, on leg ends, an inwardly directed stability-increasing curved portion, with the first cage including an elongated hole extending in the longitudinal direction and including a unilateral toothing, and an actuating instrument including a hollow cylinder with a first end with toothing configured to mate with the unilateral toothing and a second end with a handle, a guidance rod with a threaded end and configured to fit into the hollow cylinder, a knurled screw configured to act upon the guidance rod through the second end of the hollow cylinder, wherein the actuating instrument is configured to move one cage with respect to the other cage.
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Specification