Posterior lumbar internal fixation appliance

Abstract

The invention relates to the technical field of medical devices, in particular to a posterior lumbar internal fixation appliance, comprising a uniaxial pedicle screw with threads, a long tail nail holder arranged at the upper end of the uniaxial pedicle screw for mounting a longitudinal connecting rod, and a short tail nail holder arranged on the long tail nail holder for mounting a transverse connecting rod. The posterior lumbar internal fixation appliance has the advantages of simple structure, convenient use, high holding force of screw, and not easy to be prolapsed, and is particularly suitable for the surgical treatment of osteoporosis combined with lumbar vertebral diseases. The misaligned vertebral body can be restored by using the high holding force of screw during the operation, so as to achieve the purpose of correcting the deformity.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a lumbar posterior internal fixation orthosis. Background technique [0002] At present, for various forms of lumbar diseases such as spinal fractures, degeneration, tumors, and inflammations, the pedicle screw-rod system is often used for fixation treatment; the existing lumbar posterior pedicle screw system consists of a pedicle screw and a The connecting rods on the pedicle screws are composed of two pairs of pedicle screws that are screwed into two different vertebral bodies respectively during use, and the two connecting rods are longitudinally connected between the two pairs of pedicle screws to play a role of connection and fixation role. For example, the "Posterior Lumbar Internal Fixation Device" disclosed in Chinese Patent 2010205759082 and the "Dynamic Posterior Lumbar Fixation Device" disclosed in Chinese Patent 2012200237653. These fixation devices only hav...

AI Technical Summary

Problems solved by technology

However, there are still some defects in this technology: 1. The bone cement lacks biological activity: after the bone cement is injected, a bone cement interlayer is formed between the screw and the bone interface; this layer of bone cement lacks biological activity and cannot be absorbed, and bone cement may eventually appear. Abrasion and debris lead to loosening of the pedicle screws; 2. Difficulty removing the internal fixation: the bone cement is tightly combined with the screw, and it is difficult to remove the cured bone cement

Therefore, once the internal fixation breaks, revision surgery is very difficult

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