OSTEOSYNTHESIS DEVICE FOR PERIPROSTHETIC FRACTURES OF FEMUR WITH PRESERVED POSITION OF FEMORAL COMPONENT OF KNEE JOINT ENDOPROSTHESIS Russian patent published in 2024 - IPC A61B17/72 A61F2/38 

FIELD: medicine.

SUBSTANCE: osteosynthesis device for periprosthetic fractures of the femur with the preserved position of the femoral component of the knee joint endoprosthesis comprises an adapter, having the possibility of placing in a rectangular window cut from the medial surface of the femoral condyles, an intramedullary lockable pin, a fixing sleeve having the possibility of being placed in the intramedullary pin. Intramedullary nail has a hole for the fixing sleeve and the guide, with slots for connection with the target, upper and lower holes for the locking screws. Fixing sleeve is made with a socket for a screwdriver, a head, a rotating shaft, with upper and lower holes for locking screws and with a threaded tip. Adapter is made in the form of a parallelepiped with truncated longitudinal ribs, with a hole for holding a fixing bushing, with an inner cylinder with a thread inside for screwing in the fixing bushing and blades attached to it for locking the anti-rotation legs, with an external cylinder for holding an internal cylinder with slots for blades, with a ladder mechanism, a side cylinder for fixation of anti-rotational legs of a femoral component of a knee joint prosthesis with slots for blades. When the threaded tip of the fixing sleeve is screwed into the inner cylinder, the latter has the possibility of radial and vertical displacement relative to the axis of the device by means of a ladder mechanism; the blades of the inner cylinder have the possibility of locking the anti-rotation legs of the femoral component of the knee joint endoprosthesis.

EFFECT: invention provides simplification of fixation of periprosthetic fracture of distal segment of femur, as well as elimination of possible risks and complications associated with open surgical approach to fracture area, such as: surgical injuries; probability of surgical site infection with subsequent development of periprosthetic infectious process; disturbed blood supply to the fracture area; evacuation of the hematoma together with small bone fragments in the fracture area, which leads to an increase in the callus formation period; longer postoperative rehabilitation period.

1 cl, 15 dwg