INTERVERTEBRAL DISC PROSTHESIS Russian patent published in 2009 - IPC A61F2/44 

FIELD: medicine.

SUBSTANCE: invention relates to medicine. Prosthesis contains at least three units, including first plate (1), second plate (2) and core (3). Core has curved surface in contact with at least part of complementary curved surface of first plate (1), and in fact flat surface in contact with at least part of in fact flat surface of second plate (2). Apex (31) of curved surface (30) of core (3) is displaced from centre in at least one direction, relative to geometrical centre (32) of said curved surface (30) of core (3). Core (3) is made with possibility of movement relative to at least one of plates (1, 2). Enveloped and enveloping means (23, 33) of interaction, located near periphery of second plate (2) and core (3) limit or prevent core (3) displacement relative to second plate (2) on axis, in fact, parallel to in fact flat surfaces, and limit or prevent movements during core rotation relative to second plate around axis in fact perpendicular to in fact flat surfaces.

EFFECT: ensuring possibility of limited movements of different units of prosthesis relative to each other and use of core with limitation of its displacement in at least one direction.

20 cl, 3 dwg