Internal fixing device for lumbar spondyloschisis

Abstract

The invention discloses an internal fixing device for lumbar spondyloschisis. The internal fixing device comprises pedicle screws and vertebral plate hooks, wherein the two pedicle screws are respectively arranged at the two ends of a triangular connection body, long-shaped groove holes are symmetrically arranged on the shoulder parts of the two sides of the triangular connection body, longitudinal rods and a 7-shaped fixing piece are symmetrically arranged above the triangular connection body, the longitudinal rods are tightly pressed by the 7-shaped fixing piece, the top ends of the longitudinal rods are arranged on the triangular connection body, one end of the 7-shaped fixing piece can be fixedly connected with the longitudinal rods through bolts, the other end of the 7-shpaed fixing piece is inserted into the long-shaped groove hole of the triangular connection body, a T-shaped card is arranged at the end, and the vertebral plate hooks are respectively arranged at the bottom endsof the two longitudinal rods. The internal fixing device disclosed by the invention can comply with the vertebral plate hooks and the longitudinal rods through the 7-shaped fixing piece to obtain theoptimal fixing direction, so that compression on spondylolysis is effectively achieved; by means of the triangular connection body, connection of the internal fixing devices on the two sides can be achieved, and s table whole structure can be constructed; the internal fixing device has the advantages of convenience in operation, single-segment fixation, minimal invasion and accuracy.

Description

technical field [0001] The invention relates to a medical appliance, in particular to a lumbar isthmic internal fixation device. Background technique [0002] Lumbar spondylolisthesis refers to the isthmus bone defect or discontinuity between the upper and lower articular processes of one or both vertebral arches. Clinical statistics show that the incidence of spondylolisthesis in patients with low back pain is 8%. For adolescents, some patients can be cured through conservative treatment methods such as drugs and physical therapy. For those with persistent low back pain or nerve damage, spondylolisthesis and obvious intervertebral disc degeneration within a short term (3-6 months), surgical treatment may be considered. The traditional internal fixation methods are: 1) isthmus screw fixation (Buck method), which requires accurate screw positioning, difficult operation, and high surgical failure rate; 2) wire binding method (Scott method), which is invasive and difficult to ...

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Problems solved by technology

[0003] At present, there are also some documents disclosing a hook screw internal fixation device for lumbar spondylolysis for surgical treatment, such as Chinese patent application number 201320322115.3, announcement number CN203280475U, the title of invention is "a kind of spina isthmus internal fixation device", Chinese patent application number 200910098962.4, the name of the invention is "lumbar isthmus reduction and internal fixation system", the Chinese patent application number is 98213544.0, the name of the invention is "pedicle screw-lamina hook fixation device", the Chinese patent application number is 99240639.0, the name of the invention is "a lumbar spine Isthmus Memory Alloy Segmental Internal Fixator", etc., although these open documents can solve some problems of lumbar isthmus, but in actual use, there are the following shortcomings: 1) The position of the pedicle screw is basically fixed, and the upper vertebra is designed to be fixed. The best position of the plate hook should be hooked on the notch of the lamina, but the position where the lamina hook can be clamped during the operation is not necessarily on the notch, which will cause the nail hook to not be on the expected line, and can only be connected with a curved rod. Failure to comply with the designed biomechanics will increase the risk of detachment of the lamina hook; 2) According to the experience reported in many related literatures, in order to avoid the impact of the pedicle screw on the isthmus, it is generally recommended that the screw insertion position be a little more lateral and higher than the conventional one , so that the pressure of the bone graft in the isthmus cannot be well achieved, and it will lead to instability of the bone graft in the isthmus, which will affect the healing of the bone graft; 3) the current hook screw internal fixation system is used on both sides alone, and the overall connection cannot be achieved. The existing problems are When the lumbar spine is physically active, the two nail hooks move inconsistently, which increases the risk of falling off

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