Pedicle screw rod system applied to cervical vertebral canal expansion operation

Abstract

The invention relates to a medical implant which is applied to cervical vertebrae canal expansion forming operation of patients suffering from cervical spondylosis, cervical spinal stenosis and cervical posterior longitudinal ligament ossification in bone surgery and neurosurgery, in particular to a pedicle screw rod system applied to the cervical vertebrae canal expansion operation. The pedicle screw rod system is an improvement of a traditional single-door type expansion forming operation, the matched screw rod system developed according to a double-door theory adopts a mode of a pair of cantilever type connecting rods, the vertebral plate can be expanded in the vertical direction, and therefore, the clinical effects of being small in wound, rapid in recovery, large in expansion amount,uniform in expansion, high in reliability and the like are achieved.

Description

technical field [0001] The application of the present invention belongs to the pedicle screw rod used in medical implants used in orthopedic surgery, especially neurosurgery to treat patients with cervical spondylosis, cervical spinal canal stenosis, and ossification of the posterior longitudinal ligament of the cervical spine. system. Background technique [0002] Since the mid-20th century, the posterior cervical single-door laminoplasty described by foreign scholars became popular, and this technique has been widely used in the treatment of patients with developmental cervical spinal stenosis and multi-segment degenerative cervical spinal stenosis. Cervical spondylotic myelopathy, and Ossification of the Posterior Longitudinal Ligament, has become the "golden rule"; the principle is to grind a longitudinal slit on one side of the cervical lamina while grinding away one-third of the lamina thickness on the other side Two, thereby using one side of the severed lamina as a ...

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Problems solved by technology

[0002] Since the mid-20th century, the posterior cervical single-door laminoplasty described by foreign scholars became popular, and this technique has been widely used in the treatment of patients with developmental cervical spinal stenosis and multi-segment degenerative cervical spinal stenosis. Cervical spondylotic myelopathy, and Ossification of the Posterior Longitudinal Ligament, has become the "golden rule"; the principle is to grind a longitudinal slit on one side of the cervical lamina while grinding away one-third of the lamina thickness on the other side Two, thereby using one side of the severed lamina as a "door" to set off to the opposite side, so as to achieve the purpose of artificially expanding the spinal canal; such as a patent No. CN 203790014 U, titled "An anti-retraction stable type cervical posterior single Door-opening nail system" and an application with the patent number CN 201920882 U titled "Titanium Plate System for Cervical Spinal Canal Enlargement and Forming" are the results of the academic circle's efforts to improve and perfect this "single-door" operation , but there are still problems that are difficult to overcome, that is, the "hinge" in the "single door" is not stable enough and is prone to breakage; if the opening distance of the "door" is too small, it is not enough to expand the spinal canal space When it is too large, the lifted lamina will still be irritated with the change of body position, causing pain and other discomfort. At the same time, because the gap between the opened "door" is too large, it is difficult to fuse; Putting it on one side will inevitably lead to the expansion of the spinal canal space to one side, making the relieved nerve compression uneven; in addition, due to the limitation of the mechanical structure of the similar nail-plate system, it is clinically called "reclosing the door". "It is not uncommon for the phenomenon of surgical failure

[0003] How to solve the unavoidable disadvantages in the "single door" operation, that is, uneven decompression, "door hinge" is easy to break, "door gap is too large", "doorway" is unstable, and it is easy to "close the door", etc. Clinical problems that urgently need to be solved in the medical field, especially in neurosurgery

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