Elastic internal fixing system and pressure-adjustable fixing rod

Abstract

The invention relates to an elastic internal fixing system and a pressure-adjustable fixing rod for clinical application of a department of orthopedics. The one or two pressure-adjustable fixing rods are adopted and form the elastic internal fixing system with more than two single rod type and double rod type or anatomical nail fixing devices. The pressure-adjustable fixing rod comprises an adjusting rod, a sliding fit thread sleeve, an elastic device and a fixed rod. The elastic spine fixing system and the pressure-adjustable fixing rod provided by the invention have the advantages that the pressure is adjustable, fixing is firm, the operation is simple, the adjustment is easy, stress shielding is effectively prevented, osteoporosis is avoided, and fracture healing is accelerated.

Description

technical field [0001] The invention relates to a device for clinical application in orthopedics, in particular to an adjustable pressure fixing rod and an elastic internal fixation system comprising the adjustable pressure fixing rod. Background technique [0002] When fractures occur in the long tubular bones of human extremities, it is often necessary to reset and fix the fractures. The corresponding fixation techniques and materials are also constantly improving and updating, such as steel plates, intramedullary nails, external fixation brackets, etc. Currently, commonly used internal fixation devices It is a steel plate, which has disadvantages such as large surgical fixation range, multiple soft tissue stripping, large trauma, and poor reduction; after surgery, there are disadvantages such as osteoporosis, loose fixation, and even broken rods of internal fixation due to stress shielding. Had to perform a second operation or even multiple operations, seriously affecting...

AI Technical Summary

Problems solved by technology

[0005] In terms of the way, timing, type, and size of stress action, current research shows that intermittent stress stimulation can stimulate osteoblast activity more than continuous stress stimulation; research believes that early bone healing is the most effective period for mechanical factors to promote bone healing , when the fracture heals and restores the original structure and hardness, mechanical factors are the only factors for bone remodeling. In the early stage of bone healing, appropriate stress and strain between the fracture ends should be ensured. In the early stage of bone healing, the compressive stress generated by axial load can drive Osteocytes and fibroblasts develop in the direction of differentiation into bone, which is beneficial to bone healing. Shear and torsional loads produce shear stress, which should cause dynamic friction at the fracture end, which will cause greater damage to the formed capillaries and callus, and drive bone formation. Fibroblasts proliferate and produce fibrous tissue, which is not conducive to bone healing. Various stresses can promote the formation and reconstruction of callus in the middle and late stages of bone healing; bone healing requires an appropriate biomechanical environment or optimal stress level. Only when the stress level of the fracture end and the tissue stiffness of the healing area are balanced and coordinated can the tissue differentiate and heal well. If the stress is too large and exceeds the tissue bearing capacity, the living bone will undergo reactive surface absorption at the bone-bone interface or bone-internal fixation interface. The pressure at the fracture end decreases, leading to bone atrophy, and the greater the pressure, the faster the pressure at the fracture end decreases. On the contrary, it is not enough to cause elastic deformation, and the mechanical induction of tissue differentiation is reduced, which is difficult to produce, which may lead to delayed bone union and nonunion

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