Pedicle screw and bar pressing device

Abstract

The invention provides a pedicle screw and a bar pressing device. The pedicle screw comprises a screw body and a screw base. A U-shaped bar containing groove divides the screw base into a left board body and a right board body. Positioning grooves are formed in the left side of the left board body and the right side of the right board body respectively. The pedicle screw is characterized in that positioning chutes with the upper open ends are longitudinally formed in the front sides and the rear sides of the upper ends of the left board body and the right board body respectively. The bar pressing device comprises an extension sleeve, a bar pressing sleeve and a bar pressing nut. A bar pressing groove is formed in the lower portion of the extension sleeve. Two opposite strip openings are formed in the side wall of the extension sleeve. Positioning elastic pieces are arranged in the strip openings. Positioning protrusions are arranged on the inner sides of the lower ends of the two positioning elastic pieces. Positioning sliding blocks matched with the positioning chutes and protruding inwards are arranged on the inner wall of the extension sleeve, the extension sleeve is sleeved with the bar pressing sleeve, and the bar pressing nut is arranged at the upper portion, above the bar pressing sleeve, of the extension sleeve. The pedicle screw and the bar pressing device have the advantages that connection is easy, convenient and quick, connection reliability is high, disengagement is not likely to happen, detachment is easy, the bar pressing operation speed is high, and efficiency is high.

Description

technical field [0001] The invention relates to the technical field of medical instruments for spinal surgery, in detail, it is a pedicle with simple and quick connection, high connection reliability, not easy to loose, easy to disassemble, fast operation speed and high efficiency when used in conjunction with each other Screw and bar device. Background technique [0002] We know that compression rod is an intraoperative operation that is often required in spinal orthopedic and posterior spinal minimally invasive surgery. The method is to press the connecting rod into the U-shaped groove of the screw through a tool or a long-tailed pedicle screw. For multi-segment posterior thoracolumbar surgery, when the pedicle screw is implanted into the patient's vertebral body, the position of the screw seat of the pedicle screw cannot be in a straight line in most cases, nor can it be completely fitted and fixed. The axis of the rod, after putting the connecting rod into the nail seat...

AI Technical Summary

Problems solved by technology

In actual use, there are the following disadvantages: 1. The tail of the screw is long, not only the processing is complicated and the cost is high, but also an additional breaking operation needs to be performed when the operation is completed; 2. After the operation is completed, the nut needs to be unscrewed from the bottom of the extension sleeve. Due to the large number of screws and sleeves used in orthopedic surgery, doctors need to spend a lot of time taking out the nuts one by one, which is very time-consuming, which not only prolongs the operation time, but also increases the risk of bleeding and infection for the patient; During the orthopedic process, when the rod exerts a lateral force on the extension sleeve, the extension sleeve will open and loosen; 4. When the extension sleeve is removed, the cylindrical protrusion on its side is easy to get stuck on the side of the screw seat In the groove of the wall, it needs to be shaken repeatedly from side to side to take it out, which greatly affects the smooth progress of the operation

Other existing compression rod devices or pedicle screw tail connection devices have disadvantages such as difficult connection, more difficult disassembly, long disassembly time, and low efficiency

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