Bone screw with anti-regression and slow-release nutrient solution

Abstract

A bone screw with anti-retraction and slow-release nutrient solution. A coaxial inner hole is opened on the nut head. The inner hole is opened at one end far away from the screw rod and has a coaxial blind hole in the screw rod with the inner hole. The blind hole is adjacent to the nut. One end of the head is open and communicated with the inner hole; an inner rod is inserted into the blind hole, and a plurality of fixed pins are fixed on the inner rod, and a through hole is opened on the screw rod, which includes an upper through hole and a lower through hole. The spiral deflector is fixed on the inner rod. The fixed pin on the inner rod is located in the lower through hole. When the bottom of the inner rod touches the bottom of the blind hole, the free end of the fixed pin is located in the through hole. When the inner rod moves toward the nut head The free end of the fixed needle can extend out of the through hole and be inserted into the bone; the space between the spiral deflector and the inner wall of the blind hole is filled with solid nutritional factor particles, and the liquid sac is fixed inside the nut head, which can be pierced when the pulling part pulls the inner rod. The liquid sac drives the solid nutrient factor particles to flow. The bone screw can prevent retreat and has the function of slow release of nutrient solution.

Description

technical field [0001] The invention relates to a bone screw used in spinal surgery, in particular to a bone screw capable of releasing nutrient solution to bones. Background technique [0002] There are more and more requirements for the use of bone screws in spinal surgery. On the one hand, bone screws are required to be able to effectively fix bones; on the other hand, more and more bone screws are required to have more functions, such as The bones release nutrient solution to accelerate the growth of bones and shorten the duration of pain. [0003] For effective fixation, it is often required that the screw has the function of preventing axial retreat. Bone screws are used to connect broken bones or to correct various bone lesions and deformities. The broken bones or multiple vertebrae connected by bone screws are connected by rigid connectors, so that the movement or force of the bones will transfer the stress to the bone screws, and the stress will be concentrated on...

AI Technical Summary

Problems solved by technology

Although it can achieve the release of nutrients, the production cost of this kind of screw is too high, and the requirements for transportation and storage are very high. High temperature or vibration may cause the slow-release factor to fall off.

Therefore, it is difficult to apply

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