Novel adjustable intramedullary nail

Abstract

The invention discloses a novel adjustable intramedullary nail. The intramedullary nail comprises an intramedullary nail main nail of a hollow structure, and the intramedullary nail main nail comprises an intramedullary nail near end and an intramedullary nail body; the intramedullary nail near end and the intramedullary nail body are of an integrated structure, and the diameter of the intramedullary nail near end is larger than that of the intramedullary nail body. A plurality of through power screw holes are formed in the intramedullary nail near end. An adjusting hole is formed in the portion, away from the near end of the intramedullary nail, of the intramedullary nail body. Power bone screws are installed in the power screw holes and can move in the axial direction of the power screwholes. A tail cap is installed on the side of the intramedullary nail near end, a first elastomer is arranged between the tail cap and one power bone screw, and an absorbable gasket is arranged on thefar side of the power bone screw, and supports the power bone screw. An adjusting device for adjusting the stress of the fracture end is arranged on the intramedullary nail body, and can adjust the stress of the fracture end according to the specific situation of a fracture. Stress shielding of the fracture end is avoided, fracture healing is accelerated, delayed healing and non-healing of the fracture are reduced, and the occurrence rate of re-fracture after the intramedullary nail is removed is reduced.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a novel adjustable intramedullary nail. Background technique [0002] Bone plate and intramedullary nail internal fixation have been used clinically for many years. There are many methods for fracture fixation, among which intramedullary nail fixation is one of the most commonly used methods. The traditional intramedullary nail is to fix the fracture The bone is fixed on the intramedullary nail by screws, so that the intramedullary nail and the bone are integrated, but in the later stage of fracture repair, due to the stress shielding effect of the intramedullary nail, it is impossible to give suitable stress stimulation to the fracture end, and delayed bone union and nonunion are prone to occur , Slow bone mineralization, long internal fixation time, fracture after removal of the intramedullary nail and other disadvantages limit its popularization and application. Esp...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of adjustable intramedullary nail to solve the above-mentioned background technology when using a normal intramedullary nail, the diameter of the nail body is too large, especially the distal side cannot be locked with a bone screw, and only one side can be locked. Locked fractures, resulting in the inability to firmly fix the fractured bones, prone to the disadvantages of loss of reduction, displacement of fractures, delayed union of fracture ends, and nonunion

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