BIARTICULAR LIQUID ANATOMICALLY ADAPTABLE HIP ENDOPROSTHESIS Russian patent published in 2018 - IPC A61F2/32 A61F2/34 A61F2/36 

FIELD: medicine.

SUBSTANCE: biarticular liquid anatomically adaptable hip endoprosthesis contains a wedge-shaped leg, a spherical head, an acetabular cup, an insert with a spherical open-ended cavity for the spherical head and a tubular conical corrugated elastic sheath reinforced at the ends with large and small rings, respectively. Leg has a protrusion at the proximal end with three sections in the form of truncated cones: the first - for fixing the spherical head, the second transitional and the third adjacent to the leg. Upper minor base of the third portion is the large base of the second portion, and in the latter the smaller base serves as a large base of the first portion. Acetabular cup is made in the form of two hemispheres concentrically arranged with a gap and interconnected along the edges. Gap is filled with bioinert fluid. Outer hemisphere is an elastic thin-walled spherical sheath. Inner hemisphere has a "waffle" surface on the convex side, and has a conical surface on the side of the concave surface. Insert is fixed immovably on the inner hemisphere and is provided with a circumferential stop flange located at the edge, having a cylindrical surface on the convex side of the liner, and with a concave surface, a conical surface with an outward extension for abutment in the second projection portion, with the possibility of limiting the angular movement of the leg. Small ring of said sheath has an inner conical surface for hermetic self-locking connection to the third protrusion portion, and the large ring has an inner cylindrical surface for connecting to the cylindrical surface of said flange of insert and an outer conical surface for a hermetic self-locking connection to the conical surface of the inner hemisphere. Cavity formed by said tubular sheath and communicating with it the surfaces of the protrusion, insert and head is filled with a bioinert antifriction nano-liquid.

EFFECT: invention provides, firstly, the creation of a closed zone for the placement and operation of a spherical “head-insert” connection that is capable of retaining artificial lubricant and excluding the ingress of its wear products into the human body, secondly, the conditions for the adaptation of the spherical surface of the acetabular cup to the surface of the cartilaginous layer of the acetabulum, which can increase the area of their contact for the purpose of a more even distribution of the load, and thirdly, a decrease in the mass of the endoprosthesis to improve the biomechanics of motion.

1 cl, 4 dwg