| 摘要 |
Prosthetic intervertebral disc or intervertebral implant, comprising A) a middle part 2 having a central longitudinal axis 6, an upper end 4 and a lower end 5, B) an upper apposition plate 7, which is arranged across the longitudinal axis 6 on the upper end 4 of the middle part 2 and is suitable for coming in contact with the lower plate of a vertebra, C) a lower apposition plate 8 which is arranged across the longitudinal axis 6 on the lower end of the middle part 2 and is suitable for coming in contact with the upper plate of a vertebra, and whereby D) the middle part 2 comprises elastic means 19, wherein E) the elastic means 19 have a progressive spring characteristic, F) a centering is provided for the elastic means 19, and wherein G) the middle part 2 comprises a spring 12 arranged coaxially, acting as both a tension spring and a compression spring.
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