Single-plane pedicle screw

Abstract

The invention discloses a single-plane pedicle screw and relates to the technical field of orthopedics department medical apparatus. The single-plane pedicle screw comprises a screw base, a positioning compression ring and a ball-head screw and is characterized in that lateral platforms are disposed on the left side and the right side of the upper portion of the ball head of the ball-head screw, the upper side of each lateral platform is arc-shaped and protrude upwards, the ball head, between the two lateral platforms, of the ball-head screw is provided with a central boss, the upper side of the central boss is arc-shaped and protrude upwards, the arc circle center of the central boss and the connecting line of the arc circle centers of the two lateral platforms are on the same straight line, two arc-shaped concave faces matched with the two lateral platforms are disposed on the lower portion of the positioning compression ring and on the left side and the right side of a rod placing groove, and an arc-shaped groove matched with the central boss is disposed in the positioning compression ring in the middle of the two arc-shaped concave faces. The single-plane pedicle screw has the advantages that the single-plane pedicle screw is even in stress and high in overall strength, the screw is less prone to deformation during use, a screw-rod system is good in overall stability and safe and reliable, and the like.

Description

technical field [0001] The invention relates to the technical field of orthopedic medical devices. Specifically, it is a single plane with high overall strength, is not prone to deformation and failure during use, has good overall structural stability of the nail-rod system, is safe and reliable during operation, and has a good postoperative fixation effect. Pedicle screws. Background technique [0002] As we know, the existing pedicle screws are mainly uniaxial pedicle screws and universal pedicle screws. When the uniaxial pedicle screw is used to fix two or more vertebral bodies, the direction of the screw cap is fixed after one side of the pedicle screw is implanted, and the U-shaped grooves of the two screw caps are not in the same straight line, so the connecting rod is inserted difficulty. Although the universal pedicle screw overcomes the above-mentioned shortcomings, it is not suitable for scoliosis orthopedic surgery due to its universal feature. The advent of un...

AI Technical Summary

Problems solved by technology

After the shape of the ball socket and the ball head that cooperate with each other is changed, the force between the two is unbalanced, which affects the overall strength of the pedicle screw. It is prone to deformation during use and prone to screw failure during the operation, which seriously affects the safety of the operation. Surgical risks for patients

At the same time, due to the small contact surface with the bottom ball socket, the structural stability of the screw-rod system is poor, and the ball head and the ball socket are easy to slip, resulting in the loss of the screw fixation angle of the patient after the operation, which affects the surgical effect

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