Medical pedicle screw component with telescopic double thread and capable of resisting pullout

Abstract

The invention relates to a medical pedicle screw component with a telescopic double thread and capable of resisting pullout. The medical pedicle screw component with the telescopic double thread and capable of resisting the pullout is characterized in that a thread control shaft is arranged in a hollow cavity of a nail body, the thread control shaft is matched with connection rods, the connection rods are connected with telescopic screws, and the telescopic screws are arranged in a plurality of holes formed in the outer wall at the front end of the nail body. Furthermore, the cross section of the thread control shaft is of a butterfly structure, the thread control shaft comprises a middle shaft and a first support body and a second support body which are symmetrically arranged along the center line of the middle shaft, two slide pieces matched with the connection rods are fixed on the outer side of each of the first support body and the second support body, the cross section of each slide piece is in a crescent shape, the two slide pieces on each of the first support body and the second support body are oppositely arranged, and therefore rising and falling of the telescopic screws are adjusted by rotating the thread control shaft, unscrewing of threads is achieved by rotating the thread control shaft, stability of internal fixation of a spine is improved when bone rarefaction is cured or secondary screw placement is performed for revision, and occurrence rate of loosening or even detachment is reduced.

Description

technical field [0001] The invention belongs to the field of medical auxiliary equipment, and in particular relates to a medical retractable double-threaded and pull-out-resistant pedicle screw assembly. Background technique [0002] Spinal fusion is one of the main treatments for many diseases of the spine. The number of spinal fusion operations in the United States is increasing year by year. From 1998 to 2008, the number of cervical, thoracic, and lumbar fusions increased by 90% per 100,000 population. , 61% and 141% (Rajaee SS, Bae HW, Kanim LE, Delamarter RB. Spinal fusion in the United States: analysis of trends from 1998to 2008. Spine (Phila Pa 1976) 2012; 37(1):67-76) . Spinal fusion is mostly realized by posterior pedicle screw + fixation rod-screw rod system, but with the aging of the population and the resulting increase in the incidence of osteoporosis, as well as the loosening of the pedicle screws, the spinal cord The increase in revision surgery due to fusio...

AI Technical Summary

Problems solved by technology

Spinal fusion is mostly realized by posterior pedicle screw + fixation rod-screw rod system, but with the aging of the population and the resulting increase in the incidence of osteoporosis, as well as the loosening of the pedicle screws, the spinal cord The increase in revision surgery due to fusion failure (Rajaee SS, Kanim LEA, Bae HW. National trends in revision spinal fusion in the USA: Patient characteristics and complications. Bone Joint J 2014; 96B(6):807-16), traditional Pedicle screw fixation technology is greatly challenged

For osteoporosis and vertebral bodies with secondary screw placement during revision, the traditional pedicle screw fixation is easy to loose, and it is difficult to achieve firm fixation; in recent years, domestic and foreign scholars have carried out various explorations and improvements, including screw sheath, expansion Screw components, injectable screw components, etc., although the fixation of osteoporosis and revision vertebral pedicle screws can also be achieved, the change of the screw component after expansion or injection is irreversible

Once there is a problem with the pedicle screw, the internal fixation needs to be removed, and these improvements cannot achieve smooth removal

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