US Patent 7637956 Articulated endoprosthesis

An endoprosthesis for a joint, in particular a an intervertebral implant with a central axis, a top part, a bottom part and a joint provided between them, wherein the joint comprises at least two articular surfaces A and B that can slide on one another; the top part has a top apposed surface that intersects the central axis and lateral surfaces; the bottom part has a bottom apposed surface that intersects the central axis and lateral surfaces; and wherein the endoprosthesis comprises at least one channel suitable to convey body fluid, said channel terminating in one of the two articular surfaces A and B and connecting it with the exterior of the endoprosthesis for the joint.