A cobalt-chromium-molybdenum thoracolumbar posterior screw-rod system

Abstract

The invention discloses a cobalt-chromiun-molybdenum thoracolumbar posterior screw-rod system. The cobalt-chromiun-molybdenum thoracolumbar posterior screw-rod system comprises pedicle screws, rectangular rods and plug screws. Different parts are prepared from a cobalt-chromiun-molybdenum material, a titanium alloy material and a pure titanium material, under the condition that the stress intensity required by the system is ensured, the sizes of the parts in the system are reduced, and the harm to the human body is reduced. Meanwhile, through the design of matching structures of concrete structures, the combination of the system and the spine is more stable, and the use effect is improved.

Description

technical field [0001] This patent belongs to the technical field of medical devices, and specifically relates to a cobalt-chromium-molybdenum thoracolumbar posterior screw-rod system. Background technique [0002] The most common solution to spinal diseases such as thoracolumbar spine is spinal internal fixation, which has been developed in the internal fixation of the thoracolumbar spine until now, and the posterior spinal internal fixation is a relatively common method. [0003] Posterior spine internal fixation is usually achieved by implanting a screw-rod system. The thoracolumbar posterior screw-rod system is a system fixed on the thoracic or lumbar spine. After the system is implanted in the thoracolumbar spine, it may cause implantation The movement of the entry segment is excessively restricted, resulting in adjacent segment degeneration and unreliable or even failure of bone graft fusion. At the same time, excessive internal stress concentration may lead to system ...

AI Technical Summary

Problems solved by technology

[0003] Posterior spinal internal fixation is usually achieved by implanting a screw-rod system. The thoracolumbar posterior screw-rod system is a system fixed on the thoracic or lumbar spine. After the system is implanted in the thoracolumbar spine, it may cause implantation The movement of the entry segment is excessively restricted, resulting in adjacent segment degeneration and unreliable or even failure of bone graft fusion. At the same time, excessive internal stress concentration may lead to system failure, loosening, and broken nails.

The thoracolumbar posterior screw-rod system in the prior art is mainly made of titanium alloy and stainless steel, mainly including titanium alloy screws and titanium alloy orthopedic rods. Based on the consideration of stress factors and the strength of titanium alloy, the vertebral rods currently on the market Pedicle screws and orthopedic rods are relatively large in size and thick in diameter. Although this can ensure the overall rigidity of the entire spinal internal fixation system, it also brings unfavorable factors such as too high notches and too much interference with tissue growth in the body.

Images