Expanding instrument for space between lumbar spinous processes

Abstract

The invention relates to an expanding instrument for the space between lumbar spinous processes. The expanding instrument can effectively expand the space between the lumbar spinous processes and enlarge the inter-vertebral space of the lumbar, and meanwhile the spinous processes can be effectively prevented from disengaging from the expanding instrument. An expander body is formed by connecting two expanding rods through a rotating shaft. The front ends of the expanding rods are bent in an arc shape and connected with the respective expanding mouths. The expanding mouths can adapt to the spinous processes with different thicknesses, and screw holes of different lengths are formed in the upper ends of the expanding mouths. As screws are screwed in for temporary fixation according to the height of the spinous processes of a patient, the situation that the spinous processes disengage from the expanding mouths during treatment of the inter-vertebral space, so that an expander sinks and oppresses the dural sac can be prevented. The middle of the expanding rods is provided with a parallel expander composed of sliding chutes and an X-shaped component with sliding wheels. The rears of the expanding rods are provided with gripping handles, and locking devices at the tail ends of the gripping handles are connected through a threaded rod and a locking nut. The expanding instrument for the space between the lumbar spinous processes is simple in operation, convenient to use, capable of expanding the inter-vertebral space of the lumbar safely and reliably and beneficial to exposure of a surgical field; in addition, surgery time is shortened, the problem of lack of safe special expanding tools for the space between the lumbar spinous processes in existing orthopaedic instruments is solved, and the expanding instrument can be widely used for lumbar posterior vertebral canal decompression surgeries.

Description

technical field [0001] The invention relates to the field of spinal surgery, in particular to a lumbar interspinous process distraction instrument. Background technique [0002] Lumbar degenerative diseases are common and frequently-occurring diseases, including lumbar disc herniation, spondylolisthesis, and lumbar spinal stenosis. For those patients whose symptoms do not improve after strict conservative treatment, if they are combined with obvious lumbar instability, posterior lumbar laminectomy and decompression, lumbar interbody fusion and pedicle fixation are often used clinically. After the lamina of the corresponding segment is resected during the operation, the dural sac needs to be retracted, and the intervertebral space in front of it should be processed from both sides of the dura mater from back to front. Due to the narrowing of the intervertebral space after degeneration of the lumbar spine and hyperosteogeny at the posterior edge of the vertebral body, it is d...

AI Technical Summary

Problems solved by technology

At present, there is a lack of special lumbar interspinous process distraction instruments clinically. The existing spinal surgery distraction instruments are mainly used for pedicle screws or interlaminar distraction. When stretching, the effect of expanding the intervertebral space is limited, and it is easy to slide and fall off during use, causing dura mater damage and serious surgical complications

Images