Externally fixing reductor for disclocated vertebral column

Abstract

The present invention relates to external fixing restorer used for treating human body spinal column slippage, it is composed of upper and lower supporting mechanisms and intermediate suspension mechanism, the upper, lower supporting mechanisms are same in structure and are respectively composed of supporting plate and a pair of regulatable supporting nail; the suspension mechanism is composed of horizontal bar, pulling bar and traction nail, the horizontal bar is connected with pulling bar by pulling rod, a pair of adjustable traction nail are set on the pulling bar, the two ends of horizontal bar are regulatably connected with corresponding two long screws, the middle part of horizontal bar is regulatably connected with a long screw at its backside. Advantages: small wound during treating, high treating success rate, easy assembling and disassembling of apparatus, etc.

Description

technical field [0001] The invention relates to an orthopedic treatment instrument, in particular to an external fixation resetter for treating human spinal spondylolisthesis. Background technique [0002] At present, in the orthopedic treatment of spondylolisthesis, internal fixation reducers are used, which are composed of nail rods or nail-plate structures, and belong to short-segment devices. The internal fixation treatment device has relatively large trauma during treatment, inconvenient installation and disassembly of the device, poor firmness and stability, and weak reset force. It is a one-time reset during treatment, which is not easy to succeed sometimes and may cause nerve damage. And because the internal fixator is a short-segment device, its force mechanism is like a cantilever suspension, so that the force on the lower screw is very large, and the screw is prone to loosening, bending, breaking, or even pulling out, failing to achieve the purpose of treatment ...

AI Technical Summary

Problems solved by technology

The internal fixation therapy device has a large trauma during treatment, inconvenient installation and disassembly of the device, poor firmness and stability, and weak reset force

It is a one-time reduction during treatment, which is sometimes not successful and may cause nerve damage

And because the internal fixator is a short-segment device, its force mechanism is like a cantilever suspension, so that the force on the lower screw is very large, and the screw is prone to loosening, bending, breaking, or even pulling out, failing to achieve the purpose of treatment

In addition, due to the relatively large camber angles of the 4th and 5th lumbar vertebral pedicles in the human body, when the internal fixator is used for treatment, due to the difficulty in exposing the instrument itself or the surgical field, it is often unable to adapt to such a large camber angle, making the screws of the internal fixator As the camber angle decreases, the length of the screw path in the vertebral body becomes shorter, which eventually leads to a decrease in the screw fixation force and affects the treatment effect

In addition, when the internal fixator treats the fifth lumbar spondylolisthesis, the inferior screw can only be fixed on the sacrum, which is a cancellous bone, which cannot provide a good fixation basis for the screws.

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