Self-locking intramedullary needle for pressurizing femurs

Abstract

The invention discloses a self-locking intramedullary needle for pressurizing femurs, belongs to the field of medical apparatus and instruments, and particularly relates to orthopedic internal fixation devices. The self-locking intramedullary needle has functions of pressurizing oppositely closed fracture ends and comprises an outer needle, an inner needle, two proximal-part anti-rotation fins, two distal-port anti-rotation fins, a proximal-end push-pull bolt and a distal-end obstruction bolt. The proximal-part anti-rotation fins are linked with the outer needle, and the distal-part anti-rotation fins are linked with the inner needle. The self-locking intramedullary needle has the advantages that the outer needle and the inner needle are designed to have certain radian according to characteristics of medullary cavities of the femurs, decompression pits are arranged on two sides of the outer wall of the outer needle, and accordingly the self-locking intramedullary needle is suitable for fracture from 1 / 3 positions to femoral subtrochanteric positions of the femurs; the proximal-end push-pull bolt can be screwed after the selected appropriate self-locking intramedullary needle is embedded in two post-reduction fracture breakage-part medullary cavities during surgery, the inner needle can be pushed by the push-pull bolt to move towards distal ends, the proximal-part anti-rotation fins and the distal-part anti-rotation fins can be pushed to be opened in a forward and reverse 'splayed' manner and are plunged into the walls of the proximal-end and distal-end medullary cavities of the femurs, and the push-pull bolt can be screwed again when the anti-rotation fins are plunged into the walls of the medullary cavities and cannot be opened, so that fracture breakage ends can be pressurized.

Description

technical field [0001] The invention belongs to the field of medical devices, in particular to a novel femoral self-locking intramedullary nail, which has the function of pressurizing and abutting fracture ends. Background technique [0002] The femur is the largest long bone in the human body, attached to the muscles of extension, flexion, adduction, abduction, and internal and external rotation, and various stresses are concentrated. Femoral fractures are common fractures in orthopedic surgery. Modern orthopedic surgery is the first choice for femoral fractures with locking intramedullary nails Fixed, with strong anti-rotation and anti-bending functions. But interlocking intramedullary nails also have certain defects, specifically: (1), the radian of the intramedullary nail cannot adapt to the radian of the medullary cavity of all fracture patients. , the intramedullary nail is inserted, the fracture ends will be separated, and then 4 interlocking nails are placed, the fr...

AI Technical Summary

Problems solved by technology

But interlocking intramedullary nails also have certain defects, specifically: (1), the radian of the intramedullary nail cannot adapt to the radian of the medullary cavity of all fracture patients. , the intramedullary nail is inserted, the fracture ends will be separated, and then 4 interlocking nails are placed, the fracture ends will be fixed in a separated state, which is not conducive to fracture healing. After the first half of the clinical examination, the fracture ends were not obvious When there are signs of healing, take out the locking nail at the proximal end of the interlocking intramedullary nail to achieve dynamization, encourage the patient to carry out weight-bearing activities, and rely on body weight to realize the compression and apposition of the fracture end, but the effect is not satisfactory

(2) After the intramedullary nail is inserted into the femoral fracture, if the radian of the intramedullary nail does not adapt to the radian of the medullary cavity, the intramedullary nail will be deformed to varying degrees, making it difficult to aim at the interlocking nail hole at the distal end of the intramedullary nail, increasing the Difficulty of operation, delayed operation time

Various self-locking intramedullary nails have also been used clinically, but they are no longer used because of the limited expansion of the self-locking wings in the proximal and distal sections and poor anti-rotation function.

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