Intramedullary and extramedullary combined fixing device for reconstruction and reduction of radial head

Abstract

The invention discloses an intramedullary and extramedullary combined fixing device for reconstruction and reduction of radial head. The intramedullary and extramedullary combined fixing devicecomprises an intramedullary arc-shaped plate arranged in a radial head medullary cavity and an extramedullary fixing plate arranged on the outer surface of a bone body and fixedly connected with the intramedullary arc-shaped plate, longitudinal fixing holes and transverse fixing holes which are distributed in a staggered mode are formed in the intramedullary arc-shaped plate, andscrews penetrate through bone along the outer surface of the radial head fracture part and is in threaded connection with the fixing holes and the transverse fixing hole in the intramedullary arc-shaped plate. Meanwhile, the effects of enhancing and reconstructing bone bodies of all parts are achieved, the movement of joints cannot be affected, and the crushed radial head can be restored to the original physiological structure, so that physiological reconstruction is achieved, the function of an affected limb is reserved to the maximum extent, a patient can be engaged in heavy physical labor and antagonistic movement after restoration, and the problems of instability, pain, arthritis and the like caused by too long or too short radial head prosthesis are solved.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an intramedullary and extramedullary combined fixation device for radial head reconstruction and reduction. Background technique [0002] Fractures of the radial head account for approximately 3% of all fractures and are the most common fracture of the adult elbow. The elbow is made up of three separate joints: the humeroulnar, humeroradial, and superior radioulnar joints. The radial head serves as an important stabilizing structure against valgus, axial, and posterolateral rotational stresses. When the radial head fracture is large, the concave-compression mechanism is disrupted, which affects the stability and kinematics of the humerioradial joint. The stability must be restored by open reduction and internal fixation or radial head replacement. But for comminuted fractures, current techniques and fixation devices cannot achieve effective fixation. In the past, radial head re...

AI Technical Summary

Problems solved by technology

In the prior art, intramedullary fixation is also used for reconstruction and reduction. For example, the intramedullary fixation device for radial head fracture with application number 202010885565.8 has the following problems: 1. The length of the radial head fixation screw requires high precision and is too long If it is too short, it will not meet the fixing requirements. Even if it is just right, it will not be able to accommodate more screws due to the limited volume. It cannot be effectively fixed for cases with severe comminution.

2. Since the structure located in the medullary cavity of the radial body and the structure located in the radial head cavity are fixedly connected (such as plug-in fixation, etc.), but because the radial body medullary cavity and the radial head cavity are relatively narrow, and The radial head has a special structure with a certain degree of offset relative to the radial neck. Therefore, this fixed connection method not only limits the installation position of the structure in the medullary cavity of the radial body and the structure in the radial head cavity, but also the structure itself. , and the butt fixation of the two-part structure must be realized during the operation, which is not easy to operate and greatly increases the difficulty of the operation

3. Even if the precise installation is completed, the fixing strength is not high, and it cannot meet the requirements of early functional exercises

4. The original physiological structure cannot be completely restored, and it is inevitable that there will be tilt, rotation, side shift, etc., and it will be difficult to adjust during the operation.

This technology has high requirements on the accuracy of each operation, so it is difficult to promote it in clinical practice

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