Angled sliding core, also as part of an intervertebral disc prosthesis, for the lumbar and cervical spine

Intervertebral disc prosthesis for the compensation of angular positions between vertebral endplates, for maintaining or improving a function of a motion segment of the lumbar and cervical spine, comprising

• an upper sliding partner with an upper exterior side permanently assembled to an upper vertebral body,
• a lower sliding partner with a lower exterior side, said exterior side being permanently assembled to a lower vertebral body, and
• a sliding core positioned between the inner sides of the upper and lower sliding partner, wherein
• a. depending on the design of a convexity and/or concavity on the upper and/or lower side of the sliding core, one or two articulating surfaces are formed between sliding core and inner side(s) of the upper and/or lower sliding partner, and
• b. the sliding core is designed in such an asymmetrically angled way, that in at least one vertical section at least one sliding surface of the sliding core is inclined at a defined angle (angle of inclination, aperture angle) towards a fictitious horizontal, and
• c. in the case two articulation surfaces are present, the angles of inclination above and below the fictitious horizontal are equal or different and upper and the lower convexity are designed symmetrically or asymmetrically.