Pedicle screw internal fixator for strengthening spine

Abstract

A pedicle screw internal fixator for strengthening spine comprises a pedicle screw which comprises an expandable fixing sleeve and a head membrane sleeve. The expandable fixing sleeve comprises an expandable fixing sleeve body, and a first expansion piece, a second expansion piece and a third expansion piece arranged at the head of the expandable fixing sleeve body. The first expansion piece is provided with a left first expansion piece membrane rod inserting hole, a first expansion piece membrane sleeve inserting groove and a right first expansion piece membrane rod inserting hole. The second expansion piece is provided with a left second expansion piece membrane rod inserting hole, a second expansion piece membrane sleeve inserting groove and a right second expansion piece membrane rod inserting hole. The third expansion piece is provided with a left third expansion piece membrane rod inserting hole, a third expansion piece membrane sleeve inserting groove and a right third expansion piece membrane rod inserting hole. Thus, the expandable fixing sleeve is firmly fixed to the spine, the pedicle screw can be installed more firmly, and the case that the pedicle screw becomes loose and is fixed unstably is avoided.

Description

technical field [0001] The invention relates to an internal fixation device for spinal column reinforcing pedicle screws. Background technique [0002] Spinal fractures, spinal tumors, cervical spondylosis, cervical spinal stenosis, lumbar disc herniation, lumbar spinal stenosis, lumbar segmental instability, lumbar slippage and other diseases are very common in clinical practice. These diseases can cause pain, inability to stand, neck and shoulder pain, low back pain, pain and numbness of lower limbs, intermittent claudication, and even clinical symptoms of defecation and sexual dysfunction, which seriously affect the life, health and quality of life of patients. Treatment of these patients often requires spinal immobilization techniques. [0003] In 1959, Boucher et al first applied pedicle screw fixation to the spine. In 1970, clinical cases were reported successively in France and Switzerland. Since the 1980s, pedicle screw instruments have been widely accepted throug...

AI Technical Summary

Problems solved by technology

[0004] With the continuous development of the operation, more and more complications have been found, one of which is that the screw is loose, the fixation is not firm, or the position of the screw is not good for the first time during the operation, and it cannot be adjusted. Difficult, the screw cannot be removed after the bone cement is driven in

Especially for patients with osteoporosis, it is more difficult to adjust the screw, and the holding force of the screw is worse. Once it is misplaced, it is difficult to adjust

Images