Dynamic lumbar vertebra fixing system

Abstract

The invention discloses a dynamic lumbar vertebra fixing system. The dynamic lumbar vertebra fixing system comprises a dynamic rod (1), and at least two pedicle screws (2) connected to the dynamic rod (1), wherein the upper part of each pedicle screw (2) has a cavity; a screw bolt (3) is arranged in the cavity and is in threaded connection with the pedicle screw (2); the dynamic rod (1) passes through the cavity in the upper part of the pedicle screw (2); the screw bolt (3) in the cavity presses the dynamic rod (1); the dynamic rod (1) is a hollow rod; an elastic core shaft (1-2) is inserted into a hole of the dynamic rod (1); at least one section of lead screw part (1-1) of which the diameter is larger than those of two sides is arranged on an excircle of the dynamic rod (1); and more than one circles of lead threads (1-1-1) are arranged on the lead screw part (1-1). The dynamic lumbar vertebra fixing system can return a lumbar segment to a normal three-dimensional line and keep the normal height of a lumbar disc well, allows the limited movement of a spinal column and well accords with the physiological stability of the spinal column, so that the effects of relieving pains and preventing regression of neighboring segments are achieved.

Description

technical field [0001] The invention relates to a medical spinal internal fixation device, in particular to a lumbar dynamic fixation system. Background technique [0002] At present, the lumbar dynamic fixation system is used for the treatment of unstable lumbar degenerative diseases, laminectomy and unilateral facet joint resection for postoperative stabilization, lumbar spinal stenosis requiring extensive laminectomy decompression and spinal insufficiency. Stable patients, multi-segment lumbar spinal stenosis, intervertebral disc herniation and vertebral instability, unilateral vertebral body decompression surgery and other diseases. [0003] For the above-mentioned diseases, fusion and fixation methods have been used in previous operations, that is, the method of reducing and fixing the intervertebral joints with spinal pedicle screws and fixation rods. After this method of fixation, the intervertebral joints become inactive joints. If this fixation is performed in mul...

AI Technical Summary

Problems solved by technology

[0008] The various dynamic fixation systems mentioned above have various disadvantages and the products are complex, the operation difficulty is greatly increased compared with conventional operations, and the operation time is longer

[0009] Chinese patent CN201755245U discloses a dynamic rod for intervertebral fixation of the spine. The dynamic rod is composed of two rigid rods connected by joints. Abrasion and loosening will occur between them, and microscopic metal particles will be produced due to abrasion, which may have an impact on the central nervous system

Images