COTYLOID CAVITY ENDOPROSTHESIS Russian patent published in 2001 - IPC

FIELD: medical engineering. SUBSTANCE: device has cup with threaded external surface and slots corresponding to profile height and dividing the threaded surface into sectors and inseparable inlay. Knives are uniformly circumferentially mounted in the lower half of the cup equidistantly from its bottom. The knives are shaped as a part of annular ring which width does not exceed threaded sector width at the place the knife is mounted. Knife rotation axis is in parallel relation to the longitudinal cup axis and is positioned on its side opposite to cup screwing direction. A hole is made on the other side. Every knife has thread coil element on its outer surface being continuation of one on the threaded cup surface. EFFECT: enhanced reliability of endoprosthesis fixation; simplified process of its removal. 4 dwg