Pedicle screw rod system and manufacturing method thereof

Abstract

The invention relates to a pedicle screw rod system. The pedicle screw rod system comprises a pedicle screw, a screw cap and a connecting rod, wherein the pedicle screw, the screw cap and the connecting rod are made of polyether-ether-ketone or polyether-ether-ketone composite materials through a 3D printing technology; the pedicle screw comprises a cylindrical screw head and a conical screw rod;a connecting hole is formed in the top of the screw head, and threads of the screw rod adopt anti-loosening and anti-pulling design; the screw cap comprises a connecting ring and a conical connectingshaft; the connecting shaft is arranged in the connecting hole in a penetrating mode and connected with the connecting hole in an interference fit mode; and the connecting rod is arranged in the connecting ring in a penetrating mode and pre-bent according to the physiological radian of a spine to be preset into various types with different lengths. According to the pedicle screw rod system, wasteof raw materials is reduced, the production cost is reduced, and the pedicle screw rod system is high in radiability and good in stability.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a pedicle screw rod system and a manufacturing method thereof. Background technique [0002] The pedicle screw-rod system is widely used in the field of spinal surgery, and it is often necessary to use the pedicle screw-rod system to complete fixation in the posterior surgery of spinal tumors, spinal degeneration, spinal trauma, and spinal deformity. [0003] Most of the existing pedicle screw-rod systems are made of metal materials such as titanium alloys, which have poor radiolucency and are prone to artifacts in postoperative nuclear magnetic resonance (MRI) and computerized tomography (CT). It affects the doctor's inspection and judgment of the affected area; furthermore, the pedicle screw rod system is produced by traditional manufacturing processes such as injection molding, molding, extrusion molding and mechanical processing (such as cutting processing), which cau...

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Problems solved by technology

[0003] Most of the existing pedicle screw-rod systems are made of metal materials such as titanium alloys, which have poor radiolucency and are prone to artifacts in postoperative nuclear magnetic resonance (MRI) and computerized tomography (CT). It affects the doctor's inspection and judgment of the affected area; furthermore, the pedicle screw rod system is produced by traditional manufacturing processes such as injection molding, molding, extrusion molding and mechanical processing (such as cutting processing), which causes waste of raw materials to a certain extent and increases product quality. Cost; In addition, limited by traditional manufacturing techniques and other factors, the thread design of the pedicle screw-rod system manufactured by this process is simple, and the anti-pullout performance is low, so it is difficult to achieve a good effect of preventing pedicle screw loosening

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