Hollow, side hole, directional perfusion cervical pedicle bolt

Abstract

A hollow, side-hole, directional infusion vertebral pedicle screw system for orthopedic internal fixation is composed of three parts of a hollow vertebral pedicle screw, a nut and a directional injection screw core. The hollow screw is divided into a front screw and a back screw on the structure, which can be connected with a corresponding plate and a rod system; a side hole is respectively arranged in the three different planes of the front part of the front screw which are mutually arranged at the directions of 120 degrees and are perpendicular to a longitudinal shaft, the junction part (that is, a screw cap of the front screw) of the front screw and the back screw is provided with three corresponding point markers for real-time instructing the directions of the side holes of the front screw, the vertebral pedicle screw can inject bone cement and other vertebral strengthening materials into the front end or to the different directions of the outside after being screwed, and all the holes have directional functions. The directional injection screw core can be a series according to the different parameters of the directions of the side holes, which is also divided into a front end guide core and a back end positioning stalk on the structure. The hollow screw core which is provided with side holes is inserted to a back side hole to be inosculated with the side holes of the front screw of the vertebral pedicle screw; the inner surface of the back end fixing stalk is an internal thread which can be fixed with a syringe, the outer surface is an external hexagon to be corresponding to an internal hexagon of the back screw of the pedicle screw, when in injection after the positioning, only the side hole on the certain specific direction is unblocked, so as to achieve the purpose of directional infusion of the vertebral strengthening materials.

Description

technical field [0001] The present invention is an internal fixation device used in orthopedic surgery. The pedicle screw is mainly used for spinal instability, pedicle screw revision, and open and minimally invasive treatment of vertebral compression fractures, especially for senile osteoarthritis. Pain treatment and fracture reduction of vertebral compression fractures caused by porosity. Background technique [0002] Osteoporosis is a common problem with the aging population in the world, and the resulting spinal compression fracture (vertebral compression fracture, VCF) is particularly common in clinical practice. With the aging of our society, osteoporosis has not only become a problem that Chinese medical professionals need At the same time, it has also become an important social problem that the national health security system needs to face. The traditional treatment methods mainly include bed rest, drug analgesia, external fixation with braces, etc. The curative effe...

AI Technical Summary

Problems solved by technology

[0006] However, vertebroplasty and kyphoplasty have major limitations:

[0007] ①The stretching force before and after perfusion is limited, the expansion force that the vertebral body can bear is limited in elderly patients, especially those with osteoporosis, and the effect of restoring and reconstructing the height of the vertebral body and correcting kyphosis is limited;

[0009] ③Kyphoplasty is slightly better than vertebroplasty in restoring the height of the vertebral body and correcting kyphotic deformity, but the operation time and X-ray exposure time are significantly longer, so it is not suitable for patients who cannot tolerate long-term prone positions and those with poor physical fitness. poor patients;

[0010] ④The expansion balloon used in kyphoplasty is expensive;

[0011] ⑤ In vertebroplasty and kyphoplasty, polymethyl methacrylate (PMMA) bone cement is generally chosen as the vertebral body reinforcement material, but PMMA has the following disadvantages: it does not have osteoconduction and induction activity, and cannot be degraded And bone replacement, the temperature is high during the polymerization process, which is easy to cause thermal damage to the surrounding tissues, and the unpolymerized monomer has cardio-pulmonary toxicity;

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