Bone fracture plate capable of automatically converting rigid fixation into elastic fixation

Abstract

The invention relates to a four-limb fixing steel plate capable of automatically converting AO rigid fixation into BO elastic fixation. The four-limb fixing steel plate comprises a bone fracture plate, a through groove / groove, a sliding block and the like, wherein the bone fracture plate is provided with screw through holes and is fixed through bone fracture nails; when a gasket is additionally arranged between the sliding block and the through groove or the groove and the bone fracture nail is fixed, rigid connection is formed among the sliding block, the bone fracture plate, the bone fracture nails and the broken bone, the whole system forms a stable rigid structure at the beginning of fixation, and the bone fracture / fixture complex is in stable static fixation. Along with the gradual degradation and absorption of the gasket in the body, the connection between the sliding block and the bone fracture plate is gradually loosened; however, the position relation between the bone fracturenails and the sliding block and the position relation between the bone fracture nails and the bone are still rigid connection, the sliding block limited by the bone fracture nails can only axially slide along the bone fracture plate under the action of external force on the bone, axial non-rigid connection is formed between the sliding block and the bone fracture plate, and fixation of the wholesystem is gradually changed into axial non-rigid dynamic fixation. Therefore, fracture healing is facilitated, and an operation of removing a steel plate is omitted.

Description

technical field [0001] The invention belongs to the field of medical devices, and in particular relates to a bone plate that can be automatically converted from rigid fixation to elastic fixation. Background technique [0002] After more than 50 years of evolution, the mainstream fracture fixation method in the world has changed from the AO theory and instruments of strong fixation to the BO theory and instruments of elastic fixation. However, from the perspective of the fracture healing process, early strong fixation can prevent the displacement of the stump and fixation failure, and provide conditions for early functional exercise; while changing to elastic fixation with relatively weak fixation strength in the middle and late stages of fracture healing can help reduce fracture damage. The stress shielding of the broken end enables the broken end of the bone to obtain axial physiological stress stimulation that is beneficial to bone healing, thereby improving the quality o...

AI Technical Summary

Problems solved by technology

However, implants that can provide sufficient fixation strength to the load-bearing bone in the early stage of fixation cannot be transformed into elastic fixation in the middle and late stages, and surgery is required to reduce the fixation strength; if intramedullary nails are used to fix fractures, sometimes it is necessary to reapply 3 months after surgery. Do a minor operation to remove the locking nail at one end of the intramedullary nail, so that the initial static fixation can be converted into dynamic fixation; but this method is often not acceptable to patients; while the patients with bone plate fixation do not have it again Surgery, unless fracture nonunion or delayed union has already occurred; therefore, the incidence of delayed fracture union, nonunion and refracture is difficult to reduce at present

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