Split lengthening pedicle screw

Abstract

The invention relates to a split lengthening pedicle screw suitable for operations of a lumbar spinal stenosis patient. The split lengthening pedicle screw is composed of three parts including a screw head end, an internal connecting rod and a screw tail end, and the screw head end and the head side of the internal connecting rod are each provided with internal hexagonal tool screwing grooves; self-tapping threads are arranged on the outer wall of the screw head end and the outer wall of the screw tail end, a thread-free area is arranged in the middle of the internal connecting rod, thread areas are arranged at the two ends of the internal connecting rod, and the thread areas are meshed with threads on the inner walls of the screw head end and the screw tail end; hollow holes are formed in the screw head end, the internal connecting rod and the screw tail end, and corresponding guide needles can pass through the hollow holes. The split lengthening pedicle screw is applied to the operations of the clinic lumbar spinal stenosis patient, after the vertebral pedicle is cut off, the complete split lengthening pedicle screw is arranged in the vertebral pedicle, the internal connecting rod is rotated, while the screw is lengthened, the distance between breaking sections of the vertebral pedicle is driven to be increased, and the aims of lengthening the vertebral pedicle and expanding the cross sectional area of the neural canal and the hole diameter of the foramen intervertebrale are achieved. The split lengthening pedicle screw has the advantages of being simple in structure, convenient to operate, small in wound and the like.

Description

technical field [0001] The invention relates to a split extended pedicle screw suitable for operation on patients with lumbar spinal stenosis, and belongs to the field of spinal surgery medical instruments. Background technique [0002] Lumbar spinal stenosis refers to a clinical syndrome characterized by lumbago and leg pain and intermittent claudication as the main manifestations caused by the reduction in the volume of the bone-ligamentous spinal canal due to various reasons, resulting in a reduction in the activity space of lumbar nerves and blood vessels. With the acceleration of the aging process of the population, the incidence of lumbar spinal stenosis is getting higher and higher, and the number of patients undergoing surgery is also increasing year by year. [0003] The traditional standard surgery for lumbar spinal stenosis is total laminectomy. The spinous process, lamina, ligamentum flavum and some facet joints will be resected during the operation, and pe...

AI Technical Summary

Problems solved by technology

However, these devices have disadvantages such as complex structure, difficult operation, large trauma, and frequent bleeding, and very suitable devices have not been reported yet.

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