Screw assembly for bone fixation and bone fixing device

Abstract

The invention discloses a screw assembly for bone fixation and a bone fixing device. The screw assembly for bone fixation comprises a non-degradable nut and a degradable absorption screw main body, wherein the nut is detachably connected with one end of the screw main body, and the outer peripheral surface of the screw main body is provided with external threads. The bone fixing device comprises abone fracture plate and the screw assembly, wherein the bone fracture plate is penetrated by a plurality of fixing through holes along the thickness direction of the bone fracture plate; and after ascrew main body of the screw assembly is matched with one fixing through hole, one end, far away from the nut, of the screw main body protrudes out of the bone fracture plate. The inventive screw assembly can be used for bone fixation, has stable mechanical property and low cost, is used for matching with a bone fracture plate to realize bone fixation, and can promote fracture healing and accelerate callus remodeling or remodeling, so that delayed healing or nonhealing of fracture is avoided.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a screw assembly and a bone fixation device for bone fixation. Background technique [0002] At present, most of the medical metals used clinically are non-degradable biocompatible materials such as stainless steel and titanium alloys. After the fracture fixation function of the implant in the human body is completed, in most cases it needs to be surgically removed again, which will increase the economic and physical and mental burden of the patient. [0003] Implants made of traditional medical metal materials have good mechanical properties and can achieve early rigid fixation (Rigid fixation), especially for fractures of load-bearing bones (such as femur and tibia). However, because the mechanical properties (such as density and elastic modulus) of traditional medical metals do not match those of human bones, and the mechanical properties of the entire fixation system canno...

AI Technical Summary

Problems solved by technology

However, the mechanical properties of implants made of biodegradable absorbing materials (such as magnesium and magnesium alloys) are still insufficient. Since the elastic modulus of magnesium is lower than that of traditional medical metals, it is more prone to deformation and fracture. Difficult to replace traditional metal implants in specific medical applications (such as load-bearing bone fractures)

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