Low-profile easily-locked universal pedicle screw

Abstract

The invention relates to a low-profile easily-locked universal pedicle screw for fixation and correction use in posterior spinal instrumentation and belongs to the field of medical instruments. The low-profile easily-locked universal pedicle screw is composed of a screw body and a cap which are split; the top of the screw body is provided with a spherical head and is inserted into the cap; the side of the cap at the spherical head is provided with a U-shaped groove for mounting a connection rod and a lock screw for fixing the connection rod; a side fixing presser is arranged between the connection rod and the spherical head and is fixed to the cap through a clamp spring. The low-profile easily-locked universal pedicle screw has good locking convenience, great activity and good anti-pull strength, enables screw fixation to be less difficult and fixation effect to be enhanced, can prevent screw loosening, and has simplified operating steps, shorter operating time and improved fixing effect, with fewer complications occurred.

Description

technical field [0001] The invention relates to a low-profile and easy-to-lock universal pedicle screw used for fixation and correction during posterior spinal fixation surgery, which belongs to the field of medical instruments. Background technique [0002] Posterior spinal surgery is a commonly used surgical method. When it comes to fixation or correction, the screw-rod internal fixation system is indispensable. This screw-rod system is usually composed of pedicle screws and their fasteners and connecting rods. At present, pedicle screws can be basically divided into two types, namely, uniaxial fixed pedicle screws and multiaxial universal pedicle screws. screw. When the uniaxial pedicle screw is used for fixation, the technical requirements for screw placement are very high. If the U-shaped grooves of the two screws are not parallel, the connecting rod and the U-shaped groove will change from surface contact to point contact, resulting in stress concentration and easy sc...

AI Technical Summary

Problems solved by technology

However, the universal movement of the universal pedicle screw currently used is small, it is not easy to install the connecting rod, and the locking mechanism is realized by the mechanical pressure of a single clip, so it cannot be realized like the uniaxial pedicle screw. Parallel distraction and compression, not to mention rotation orthopedic, so only used to stabilize the spine

Even so, the notch of these screw caps after fixation is relatively high, and the position above the pedicle where the screw is placed is the most muscular position, which often leads to the long-term deterioration of the muscle tissue at the postoperative fixation site due to the high notch cap. Chronic low back pain due to friction injury

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