Disc prosthesis for damping tilting movements has grooves provided around one of the contact surfaces and containing elastic rings in contact with the opposite-lying contact surfaces

摘要

Disc prosthesis comprises a core (3) arranged between a base plate (1) and a covering plate (2). One of the plates has a first concave contact surface (6) on the side facing the core and the core has a first convex contact surface. Grooves (11, 11', 12, 12') are provided around one of the contact surfaces and contain elastic rings (13, 13') in contact with the opposite-lying contact surfaces. An Independent claim is also included for a spacer for the disc prosthesis. Preferred Features: A mandrel for delimiting the movement between the base and covering plates about their central axes is provided along one of the central axes extending from the base plate to the covering plate. The contact surfaces of the base or covering plates are convex and the contact surfaces of the core are concave.