Suspended elastic fracture fixator

Abstract

A suspended elastic fracture fixator belongs to orthopedic medical instruments and comprises a cylindrical elastic nail body and suspended fixing blades, tips are arranged at two ends of the nail body, the suspended fixing blades are inclined spiral blades, and a plurality of suspended fixing blades are coaxially arranged on the elastic nail body. The suspended elastic fracture fixator has advantages that the nail body is supported at an axis position of the bone marrow cavity in a suspended mode and is not contacted with or fixed to an inner wall of the bone marrow cavity, fatigue resistanceis the strongest, and stress shielding is the smallest; fracture can be automatically restored; the nail body, a fracture broken end and callus bear uniform stress; when elastic fixation is balanced,the stress shielding of the suspended elastic fracture fixator is zero, fracture healing is not interfered, original stress stimulation before fracture can be received, strong gene expression of osteoblasts at a fracture part is triggered, corresponding protein synthesis formed by bones is accelerated, rapid evolution of the osteoblasts, proliferation and ossification and rapid calcification of callus are realized, therefore, the fracture is accelerated to heal towards the original form and structure.

Description

technical field [0001] The invention belongs to an orthopedic medical device, in particular to a suspended elastic fracture fixer. Background technique [0002] According to Wolff's law in orthopedic surgery, the growth of bones will be affected by mechanical stimuli to change their structure. When used, it will be strong, and if it is not used, it will be weak. It is generally believed that in the early stage of fracture healing, sufficient strength and rigidity are required for fixation. However, due to long-term fixation of steel materials, the bone structure becomes weak and shrinks, and there is a risk of secondary fractures. In the latest edition of the domestic textbook "Surgery" and the top domestic monograph "Practical Orthopedics", it is believed that the existence of rotation, bending and shear stress at the fracture site is an important factor affecting the smooth growth of bone site tissue. Through a retrospective study, we found that controlled intermittent ro...

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Problems solved by technology

[0006] However, although this elastic interlocking intramedullary nail is fixed in the medullary cavity, due to its elasticity, elastic deformation will occur in the medullary cavity according to the shape of the medullary cavity, and the intramedullary nail will have a wider contact with the inner wall of the bone marrow cavity for fixation , instead of real intramedullary axis fixation, so that both the elastic locking intramedullary nail and the broken end of the fracture bear uneven stress, so the fatigue resistance of the intramedullary nail is weakened, resulting in broken nails, which interferes with the fracture process to a certain extent heal

In addition, due to its elasticity, elastic deformation will occur in the medullary cavity according to the shape of the medullary cavity, and the intramedullary nail will have a wider contact with the inner wall of the bone medullary cavity for fixation instead of the real intramedullary axis fixation, resulting in fractured ends Dislocation requires steel wires or wire ropes to assist in fixation to achieve the reduction state of the fractured end, which will cause stress and damage to the fractured end, which is not conducive to bone healing

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