LIQUID INTERVERTEBRAL DISK ENDOPROSTHESIS Russian patent published in 2018 - IPC A61F2/44 

FIELD: medicine.

SUBSTANCE: liquid intervertebral disc endoprosthesis contains upper and lower axisymmetric and opposite supporting plates with spike-shaped fixation elements in the bodies of the vertebrae on plates outer surfaces and an elastic supporting-centering element installed between them. The supporting-centering element is made in the form of a flat circular membrane box formed by two poppet corrugated membranes connected along the outer generatrix and located coaxially and opposite, with a central hole in a ring collar in one of them, while the bottom part of the membrane with no holes is attached to the lower supporting plate. A cylindrical cup is fixed with its upper part in the central hole of the other membrane, its bottom contains radial slits which located along a circle with the same circuit step, to fix the ends of flat springs installed in the cup parallel to its axis and connecting the lower part with the upper supporting plate containing the same mirror slits for fixation of the other ends of the springs. The box cavity formed by the membranes and cup is sealed and filled with bioinert medical gel under excessive pressure, and the cup cavity of with flat springs is filled with elastic bioinert silicone.

EFFECT: simplified design, lack of wear debris falling into the human body tissue, and hence of the need to remove them during inspections, increased service life of the implant and reduced duration of operational interference.

2 dwg