Bi-flexible vertebral arch pedicle screw rod fixation system for screw rod

Abstract

A bi-flexible vertebral arch pedicle screw rod fixation system for a screw rod used in orthopaedic and neurosurgical operations is characterized in that a vertebral arch pedicle screw and a connecting rod are a flexible vertebral arch pedicle screw and a flexible connecting rod respectively and both have micro-dynamic functions. A screw body of the flexible vertebral arch pedicle screw and a screw seat are connected by a flexible body composed of a cylindrical spring, rigid rods at both ends of the flexible connecting rod and one section or a plurality of interval-distribution sections in the middle are connected by a flexible body composed of a cylindrical spring; the flexible vertebral arch pedicle screw is connected with the screw body and the screw seat at both ends of one section of the cylindrical spring; the flexible connecting rod is connected and fixed with one section of rigid metal rod at each end of the cylindrical spring, and the outer diameter of the cylindrical springs is not larger than that of the connected rigid metal rods. Because of the elastic range of motion of the screw rod, the fixed spinal segment has better non-fusion fixation effect than a single flexible screw rod, and is more conducive to reducing the stress concentration of the adjacent segments and preventing the degeneration of the adjacent segments.

Description

technical field [0001] The invention relates to a human body implant used in orthopedics and neurosurgery, in particular to a double-flexible pedicle screw fixation system. Background technique [0002] At present, the pedicle screw and rod fixation system used in orthopedic surgery is composed of several pedicle screws (hereinafter referred to as "nails") and connecting rods (hereinafter referred to as "rods") connecting each pedicle screw. The early pedicle screw and rod fixation system was made according to the theory of "rigid fixation and fusion" called "golden law". Its characteristics are: the connecting rod is a rigid rod. However, at the end of the operation, after the screw plug is locked on the connecting rod, the entire pedicle screw-rod system, together with the implanted diseased vertebral body, are fixed into one The whole body without relative movement; however, with the continuous development of the academic circle, people discovered a phenomenon, that is, ...

AI Technical Summary

Problems solved by technology

[0002] At present, the pedicle screw and rod fixation system used in orthopedic surgery is composed of several pedicle screws (hereinafter referred to as "nails") and connecting rods (hereinafter referred to as "rods") connecting each pedicle screw. The early pedicle screw and rod fixation system was made according to the theory of "rigid fixation and fusion" called "golden law". Its characteristics are: the connecting rod is a rigid rod. However, at the end of the operation, after the screw plug is locked on the connecting rod, the entire pedicle screw-rod system, together with the implanted diseased vertebral body, are fixed into one The whole body without relative movement; however, with the continuous development of the academic circle, people discovered a phenomenon, that is, if each vertebral body after operation can maintain a small relative movement, it is more conducive to reducing the stress of adjacent segments The possible damage caused by concentration is conducive to its recovery; therefore, a product "Dynamic Rod" with micro-dynamic function was developed according to the "non-fusion fixation" theory, also known as the "non-rigid fixation" theory. and "Dynamic Nail" are used clinically, although both of them produce expected good clinical effects, they also have defects worthy of improvement: as the patent No. is CN 102475571A, the dynamic rod named "Connecting Rod Structure", Because of the large outer diameter of the active segment shown, it cannot be applied in minimally invasive surgery, and its large volume has also been criticized clinically; another example is the patent number CN 202136405U, which is named "micro-incremental support vertebra The dynamic nail of "pedicle nail" is also limited in popularization and application because of its high notch, complex structure, and possible wear and tear; more importantly, the above two are only from the "rod" or "stick" According to the latest academic research, if both the "rod" and the "nail" can present the "micro-dynamic" function at the same time, the entire pedicle screw-rod system can achieve more dimensional activities , to adapt to complex spinal movements, better reduce the stress concentration of adjacent segments, and reduce the occurrence and development of adjacent segment degeneration

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