Spinal internal fixation extension rod

Abstract

The invention relates to a spinal internal fixation extension rod. The rod is characterized in that: both ends of a first connecting rod are respectively provided with a hexagonal prism of the first connecting rod, the hexagonal prism of the first connecting rod is provided with a locking screw hole of the first connecting rod, the connecting end of a second connecting rod is provided with a hexagonal prism-shaped groove of the second connecting rod, the connecting end is provided with a locking screw hole of the connecting end of the second connecting rod, the locking screw hole of the connecting end of the second connecting rod penetrates the connecting rod, the tail end of the second connecting rod is provided with a hexagonal prism of the second connecting rod, and the hexagonal prismof the second connecting rod is provided with a locking screw hole of the tail end of the second connecting rod. The hexagonal prism of the first connecting rod is inserted into the hexagonal prism-shaped groove of the second connecting rod, and a locking screw is inserted into the locking screw hole of the connecting end of the second connecting rod for detachable and fixed connection, so that the first connecting rod and the second connecting rod are in detachable and fixed connection. According to the present invention, the rod has a simple structure, and is directly extended base on the original connecting rod, which facilitates carrying out reoperation, too much wound exposure is not need, and surgical trauma is reduced.

Description

technical field [0001] The invention relates to a spinal internal fixation extension rod. Background technique [0002] Spinal internal fixation pedicle screw-rod system is often used to treat various spinal degenerative and unstable diseases. After the internal fixation is completed, due to biomechanical changes, the adjacent segments of the fixed segment often degenerate (especially in the In this case, a second operation on the adjacent segment is often required and re-fixation. In order to reduce the trauma of the second operation, it is usually selected to further extend the original connecting rod. At this time, a domino joint is required. Complete the process. [0003] The domino joints used in the prior art are juxtaposed hollow block or tubular structures, respectively connecting the connecting rods in the initial operation and the connecting rods added in the second operation, and have multiple rotating structures for adjusting the gap between the two rods. angle...

AI Technical Summary

Problems solved by technology

[0004] In actual use, there are the following defects: 1. The side-by-side structure takes up a lot of space, leaving less space for surgical operations, which increases the difficulty of surgery; 2. There are many locking structures, and the operation is complicated, so it is difficult to ensure that the two rods are not changed All structures are locked at the same time under the premise of relative position, which also increases the complexity of the manufacturing process; 3. The original connecting rod needs to leave sufficient length at the end to ensure that it can be firmly connected with the joint, but in many cases, the first time During the operation, a longer tail end is not reserved predictably. At this time, the original incision needs to be exposed, the original connecting rod is taken out as a whole, and then a longer connecting rod is replaced, which increases the trauma of the operation.

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