Assembly for reinforcing injectable vertebral pedicle screw

Abstract

The invention discloses an assembly for reinforcing an injectable vertebral pedicle screw. The assembly is composed of a side hole screw, an injecting device and an inner bolt which are matched with one another for usage; the side hole screw is made of medical titanium alloy materials and composed of a side hole screw thread section, a side-hole-free thread section and a tail portion, the side hole screw is provided with a center hollow cavity which penetrates through the full length of the screw, the side hole thread section is provided with a side hole which is communicated with the center hollow cavity along the direction of a thread, and the tail portion is a U-shaped groove; the injection device is made of medical polymer materials and composed of an injection end, an injection pipe cavity and a piston, the injection end is matched with the tail portion of the side hole screw, the injection pipe cavity is a cylindrical pipe cavity, and the piston is formed by connecting a rod portion and a handle portion; and the inner bolt is made of medical titanium alloys and composed of a front end cone and a rear end cylinder. According to the assembly, under the condition of bone rarefaction, internal fixation stability can be improved when the screw is initially placed, risks that the vertebral pedicle screw is loosened are reduced, internal fixation stability and reliability of the spine can be enhanced, and operation failure occurrence rates can be reduced.

Description

technical field [0001] The invention belongs to medical auxiliary equipment, and relates to pedicle screws used in spinal internal fixation, in particular to an injectable pedicle reinforcement screw assembly, which is mainly used to improve the stability of spinal internal fixation under the condition of osteoporosis and reduce internal Risk of fixed failure. Background technique [0002] At present, transpedicular internal fixation has become a routine technique in spinal surgery. Pedicle screws can be used for three-dimensional correction of spinal deformity and reconstruction of spinal stability by means of traction, compression, and rotation. The key to the stability of pedicle screws depends on the ability to obtain sufficient "bone-screw" interface holding force, and this holding force must continue until a solid bony fusion between the vertebral bodies is achieved. However, in clinical work, osteoporosis often leads to a decrease in the fixation ability of pedicle ...

AI Technical Summary

Problems solved by technology

[0004] 1. The capacity of the screw channel is limited, the dose of bone cement injected is limited, and the effect of enhancing the stability of the screw has certain limitations;

[0005] 2. In the traditional reinforcement method, the bone cement is relatively evenly distributed in the bone around the screw, tightly wrapping the screw, which is likely to cause a large amount of damage to the surrounding bone during the screw removal process, which is difficult for screw removal and secondary screw placement. create difficulties and risks;

[0006] 3. More importantly, during the process of screwing in the screw, the bone cement is squeezed into the surrounding bone by the screw, and its flow and distribution are uncontrolled, which is prone to leakage and compression of nerves, etc., especially when the pedicle When a microfracture occurs in the cortex without being discovered, the bone cement is easily squeezed into the spinal canal when the screw is screwed in, compressing the spinal cord and nerves.

Once leakage occurs in the spinal canal, even if the screw is removed in time, the problem of compression in the spinal canal cannot be solved

Even if the screw channel is carefully explored during the operation, and the dose and pressure of the injected material are carefully controlled, the occurrence of leakage cannot be completely avoided, which brings great challenges to the operation of the surgeon and limits the wide application in clinical practice.

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