Hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of thigh bone from rear side

Abstract

The invention discloses a hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of a thigh bone from a rear side. The hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of the thigh bone from the rear side comprises an arc guide frame, wherein a restoration rack is arranged at one end of the arc guide frame; a combined sleeve which moves along the arc guide frame is arranged at the other end of the arc guide frame; the tail end of the restoration rack is connected with the arc guide frame; a restoration hook is arranged at the front end of the restoration rack; a limiting groove is formed in the restoration rack; the combined sleeve comprises an outer barrel and an inner barrel; the inner barrel moves in the outer barrel coaxially; pointed claws are respectively arranged at an outlet end of the inner barrel and an outlet end of the outer barrel; and when the combined sleeve moves along the arc guide frame, the pointed claws are always pointed to the circle center of the arc guide frame. during surgery, the hollow lag screw guide pin aiming fixator for restoration of lesser trochanter of the thigh bone from the rear side is inserted from the rear side, muscles are pushed away by the front arc-shaped restoration rack, the restoration hook hooks a fracture block of the lesser trochanter and drags to the rear lower direction, sliding of the aiming fixator can be avoided by the square limiting groove, and therefore, the restoration effect is direct and reliable.

Description

technical field [0001] The invention relates to the field of orthopedic surgery equipment, in particular to a guide pin aiming device, in particular to a hollow lag screw guide pin aiming fixer for reduction through the posterior lesser trochanter of the femur. Background technique [0002] Intertrochanteric fractures are common clinical orthopedic fractures. The lack of lateral fulcrums of fracture stress caused by the reduction and poor fixation of small trochanteric fracture fragments is the failure of internal fixation of intertrochanteric fractures (causing screw loosening, plate breakage, key cause of refracture, coxa varus, etc.). However, due to the special anatomical position of the lesser trochanter (located on the posterior medial side of the femur, which is the insertion point of the iliopsoas muscle), the fragment of the lesser trochanter is pulled forward and upward by the pull of the iliopsoas muscle after the fracture, and its position is deep in the , the l...

AI Technical Summary

Problems solved by technology

[0003] Most of the current clinical operations use bone hooks to reset from the front, but the reduction effect is poor, and the lesser trochanter cannot be effectively fixed; in addition, the existing lesser trochanter reduction equipment is also inserted from the front of the proximal femur during surgery. It is expected to use its tip to hook and reduce the small trochanteric fragment, but the device also has poor reduction effect, and the guide pin and fixation screw cannot be placed in the ideal direction. In addition, the drilling of the guide wire can easily cause iatrogenic damage to the rear structures such as the sciatic nerve due to the lack of barriers, so this operation will cause great damage to the surrounding tissues.

[0004] At present, there is still a lack of special equipment that inserts, reduces, and simultaneously compresses and fixes the lesser trochanteric fragment from the posterior side of the proximal femur

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