Dynamic inner fixing rod for lumbar vertebrae

Abstract

The invention discloses a dynamic inner fixing rod for the lumbar vertebrae. The dynamic inner fixing rod is characterized by comprising a cylindrical outer titanium rod sleeve (1) and an inner titanium rod core (2); the cylindrical outer titanium rod sleeve (1) is provided with a center through hole (11), at least one cylindrical boss (12) is arranged on the outer periphery of the outer titanium rod sleeve (1), and each cylindrical boss (12) is provided with a spiral groove (13); one end of the inner titanium rod core (2) is provided with a boss (21), and a cylindrical rod (22) is arranged at the other end of the inner titanium rod core (2) and internally sleeves the center through hole (11) of the outer titanium rod sleeve (1). The dynamic inner fixing rod for the lumbar vertebrae has the advantages that the dynamic inner fixing rod for percutaneous minimal invasion of the lumbar vertebrae is capable of well fitting the curve of the spine to keep the lumbar vertebrae in an original biomechanical curve; due to the fact that the spiral grooves of the outer titanium rod sleeve can be compressed, stretched and deformed to realize micromotion, stability of the lumbar vertebrae can be maintained while mobility of a fixed segment can be kept partially, and degeneration of adjacent segments is decelerated to realize rehydration of the fixed segment.

Description

technical field [0001] The invention relates to an orthopedic medical device, in particular to a lumbar dynamic internal fixation rod. Background technique [0002] The main function of a healthy lumbar spine is to stabilize adjacent vertebral bodies, protect nerves, and support part of the body's weight. However, when the lumbar spine disease is likely to affect these functions and affect people's normal life activities. For some lumbar diseases, lumbar pedicle screw fixation is a better treatment method, and it is widely used at home and abroad. The lumbar internal fixation orthopedic rod is the connecting rod used to connect each pedicle screw in lumbar pedicle screw internal fixation. The traditional lumbar internal fixation orthopedic rod uses a cylindrical metal rod. When it is implanted into the human body for orthopedic correction, due to the difference in rigidity between the metal and the lumbar spine, the traditional spinal internal fixation orthopedic rod canno...

AI Technical Summary

Problems solved by technology

The traditional lumbar internal fixation orthopedic rod uses a cylindrical metal rod. When it is implanted into the human body for orthopedic correction, due to the difference in rigidity between the metal and the lumbar spine, the traditional spinal internal fixation orthopedic rod cannot fit the curvature of the lumbar spine well. Although the lesion is treated, the load distribution of the lumbar spine will be destroyed at the same time, increasing the load on the adjacent segments of the lesion and increasing the risk of degeneration of the adjacent segments

Once the traditional lumbar internal fixation orthopedic rod fails to fuse, it will not only fail to treat the lesion, but also damage the adjacent segment of the lumbar spine, which will bring more pain to the patient

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