ARTIFICIAL INTERVERTEBRAL DISC

摘要

FIELD: medicine. ^ SUBSTANCE: core for an artificial disc for natural disc replacement in a human vertebra is designed to be inserted in between and to move relative to upper and lower end plates attached to the adjacent vertebras, and contains: a core frame having at least one bearing surface to engage with an interacting bearing surface generated on at least one of end plates, respectively; at least one bearing surface mentioned has a curvilinear segment to be engaged with a curvilinear bearing surface on one of end plates mentioned; a segment having a profile that differs from the adjacent surface generated on the curvilinear site to support a preferential orientation of at least one of end plates relative to the core. A total disc endoprosthesis contains a pair of end plates with external surfaces to be attached to the adjacent vertebras; the core frame shaped and sized to be arranged between said pair of end plates. Each end plate has an internal surface to be engaged with the core. At least one of end plates has a bearing surface to interact with the bearing surface located on the internal surface of one of end plates. The core is shaped so that a segment carrying maximal load is located in a off-centre place of the core frame. ^ EFFECT: inventions enable to position the vertebral segment due to the height variation over its surface with maintaining operative motions and reduced injury rate of the adjacent segments. ^ 31 cl, 43 dwg