Pressure-adjustable combined-type outer fixing support and pressure-adjustable fixing arm

Abstract

The invention relates to a pressure-adjustable combined-type outer fixing support for clinical orthopedic application. Combining forms of the pressure-adjustable combined-type outer fixing support include a single arm type, a semi-ring type and a ring type, fixing clamping blocks include knitting needle clamping blocks and knitting rod clamping blocks, a pressure-adjustable fixing arm is composed of an adjusting shaft, an adjusting nut, a sliding fit thread sleeve, an elastic device, a fastening nut and a fixing rod, the adjusting shaft is radially provided with a retaining spring pin, a fixing ferrule, a graduated sleeve and a sliding sleeve, the sliding fit thread sleeve is radially provided with a limiting pin, a limiting jack screw and a fastening jack screw, and the elastic device is composed of a spring, a pressure sensor, a connecting pipe and a pressure displayer and can be provided with a piezometer or not. The pressure-adjustable combined-type outer fixing support can transmit stress to enable stress to be generated at a fracture end, stress shielding can be avoided, and delayed fracture healing and fracture disunion are prevented.

Description

technical field [0001] The invention relates to a device for clinical application in orthopedics, in particular to a pressure-adjustable fixing arm and a pressure-adjustable combined external fixation bracket including the pressure-adjustable fixing arm. Background technique [0002] The process of fracture healing is complicated, and scholars at home and abroad are constantly improving their understanding of the theory of fracture healing. The idea of ​​strong fixation of fractures advocated in the early days has been confirmed by decades of clinical practice and experimental research. Osteoporosis, delayed fracture union, nonunion, fracture after removal of fixation, breakage of fixation, etc., the proposed biologically reasonable osteosynthesis viewpoint is gradually accepted, fracture healing is affected by patient age, mechanical environment, local Influenced by many factors such as blood supply and endocrine, stress is one of the main factors. Orthopedic treatment of f...

AI Technical Summary

Problems solved by technology

[0006] Unresolved problems in current research: The optimal force value and optimal mechanical parameters for stress stimulation required by the fracture ends in different healing stages of human fractures have not yet been established

But the elastic device of the external fixator still has the following deficiencies: the pressure transmission device of the elastic rubber bag or spring of the elastic device is difficult to assemble in the cylinder, it cannot be assembled and installed by various parts, and it is difficult to extend to large-scale production and assembly; the sliding nail body The pressure adjustment can only be adjusted by the cooperation of the special pressure device with the pressure hole set on the side and the pressure hole set on the cylinder. The operation is complicated and time-consuming, and the pressure cannot be accurately pressed. , the gap at the fracture end cannot be adjusted accurately in time; the sliding shaft limit device is limited by setting a limit nut or a limit clamp on the sliding shaft, which increases the length of the elastic device of the external fixator and affects the insertion of bone screws or bone needles Point selection, which affects fracture fixation strength

Images