One-way automatic stretching pedicle screw and application thereof

Abstract

The invention relates to a one-way automatic stretching pedicle screw and application thereof. The one-way automatic stretching pedicle screw comprises a screw cap, a compressing gasket and a screw body. The screw body penetrates through the screw cap and is limited and fixed through the compressing gasket. The screw body penetrates through a round runway through hole at the tail end of the screw cap, and a spherical joint of the screw body is matched with a spherical joint socket I of the screw cap; the compressing gasket is clamped in, a spherical joint socket II of the gasket is matched with the spherical joint of the screw body, and two edges of the gasket protrude to be clamped to a groove of the screw cap; a cylindrical joint of a screw head with the screw body is matched with the round runway through hole at the tail end of the screw cap and a horn mouth on a single side to realize single planemovement; the invention also discloses an application of the one-way automatic stretching pedicle screw, mobility between the screw body and the screw cap is determined by opening size of the horn mouth so that design of single-plane screws of different mobility requirements is achieved; various specifications can be provided according to different thread sizes of the screw body, and the pedicle screw is adaptable to different occasions owing to screw bodies with different diameters and lengths.

Description

【Technical field】 [0001] The invention relates to the technical field of orthopedic medical devices, in particular to a unidirectional self-expanding pedicle screw and its application. 【Background technique】 [0002] At present, the posterior spinal screw and rod internal fixation system has been widely used in the treatment of spinal injuries and diseases for bone reduction and fixation. Usually, pedicle screws, hooks and other fasteners are implanted and fixed to the vertebral body, and connected by connecting rods to play a supporting role. [0003] When the traditional uniaxial pedicle screw is used for fixation, if more than two vertebral bodies are to be fixed, the direction of the screw cap is often fixed after the pedicle screw is implanted on one side, and the U-shaped groove of the screw cap is not in the same line. And make it very difficult to place the connecting rod. In some cases of osteoporosis, the pedicle screw will often be loosened if placed forcibly. ...

AI Technical Summary

Problems solved by technology

However, for conditions such as scoliosis that need to be limited to a single plane of motion, the range of motion allowed by universal pedicle screws is too large

[0005] Therefore, the current uniaxial pedicle screws and universal pedicle screws have their disadvantages, and neither can well meet the current requirements of only a single plane of motion, such as scoliosis.

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