HIP JOINT ENDOPROTHESIS Russian patent published in 2008 - IPC A61F2/32 

FIELD: medicine; traumatology.

SUBSTANCE: endoprothesis contains acetabular component, head, neck and crus. Crus consists of conic rod and casing. Conic rod is installed in subtrochanteric region coming to threaded cylinder with lock screw through threaded channel perpendicular to plane through neck and crus axes. The casing is hollow cone with internal surface congruous to specified rod surface and has hexagonal external surface in subtrochanteric region with threaded internal surface, reciprocal to a threaded cylindrical rod. Along specified hexagonal surface edge there is a flat neck direction indicator installed. By opposite edges of specified hexagonal surface parallel to plane of the mentioned indicator, there are perpendicularly through lock screw coaxial apertures, the latter are coaxial to specified threaded channel. The casing is equipped with windows with upper edges furnished with narrow edged lobes as internal and external flat springs laid one on another. External flat springs are straight and cover windows not projecting outside. Internal springs are convex-bent, thus convex is oriented inside and installed crus casing cavity. As conic rode is inserted to casing, internal flat springs deflect external flat springs ectad beyond windows.

EFFECT: invention provides improved endoprosthetics operation outcomes due to increased stability of joint crus.

6 dwg