Pelvis and spinal column internal fixing device for treating lumbar vertebrae olisthy olisthe

Abstract

Disclosed a pelricspine reduction internal fixation device for treating spondylolisthesis belonging to surgical instrument and providing an internal fixation device which can fix steadily, recover position efficiently, and has a staple that hard to pull out and destroyed. It comprises two bolts at pedicle of vertebral arch for guiding, two double hooks, and a umbosacral rod. The bolt at pedicle of vertebral arch for guiding comprises a part if pedicle of vertebral arch in pole type and a guiding part while the parts is linked by gimbal suspension in the corner dimension of 80-180 degree and the free end of first part is screw. The free end of guiding part has link screw which is locked to one end of double hooks by locking nut, and the umbosacral also has screw. The two bolts at pedicle of vertebral arch for guiding and the two double hooks that mounted transversely up and down are eudipleural. Said device can increase strength of guiding and recovering position, increase the stability of fixing point, supply continuous guiding and suspension and can be operated easily with little injury.

Description

technical field [0001] The invention relates to an internal fixation device for pelvic spine reduction for treating lumbar spondylolisthesis, and belongs to the technical field of surgical medical instruments. Background technique [0002] Lumbar spondylolisthesis is a common and frequently-occurring disease among middle-aged and elderly people. Patients may suffer from pain and limited mobility in mild cases, or inability to move and lose mobility in severe cases, causing great pain to patients. Since the late 1980s and early 1990s, pedicle screw internal fixation devices have been widely used clinically, making reduction and correction of the lower lumbar spine gradually a reality. There are many types of pedicle screw internal fixation devices, such as Roy-Canille plate, Dick’s fixation device, CD pedicle screw device, Steffee plate, AO internal fixation device, Concord plate, etc. These devices have the advantages of high fusion rate and sufficient decompression of comp...

AI Technical Summary

Problems solved by technology

However, in clinical practice, it is also found that these devices still have some shortcomings, mainly in the following aspects: ① Both the fixation nail and the lifting nail are in the spine, which is a kind of spine-to-spine fixation, the moment arm is short, and the lifting and reset effect is small; ②The local stress is concentrated, which is easy to cause broken nails and rods; ③The pedicle screws are straight screws, which are easy to pull out during the operation or when the patient moves after the operation; ④Both the fixed screws and lifting screws are pedicle screws, which increase risk of pedicle burst and nerve damage

The above shortcomings lead to hidden dangers such as small reduction effect, easy pull-out of straight nails, low fixation strength and stability, and easy breakage of nails and rods after surgery. The pain of re-operation

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