Polyaxial pedicle screw fixing device with self-breaking screw

Abstract

The invention relates to a polyaxial pedicle screw fixing device with a self-breaking screw and belongs to the technical field of medical equipment. The fixing device is the main part of a spine and thoracolumbar spine posterior approach internal fixation system and used for fast assembling a pedicle screw and a fixing rod. The polyaxial pedicle screw fixing device comprises a screw seat, the self-breaking screw, a pressing block, a screw head and a C-shaped clamp ring and is characterized in that two symmetrically U-shaped grooves are arranged in the lateral wall of one side of the screw seat, an implanting hole is arranged inside the screw seat, an axial groove is arranged inside the implanting hole, the outer lateral wall of the pressing block is provided with a protrusion correspondingto the axial groove, the screw head and the pressing block are connected in a sleeved manner, the C-shaped clamp ring is embedded into an annular groove in the bottom of the screw seat, and self-breaking screw is connected with the upper portion of the screw seat through a rectangular thread. The polyaxial pedicle screw fixing device has the advantages that the device is simple to operate, capable of achieving fast fixing, capable transmitting large torque and capable of preventing the thread abrasion of the self-breaking screw, the twisting off torque of the self-breaking screw is consistent, quantification locking is achieved, and surgery efficiency and accuracy are increased.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a universal pedicle screw fixation device with self-breaking screws. Background technique [0002] Advances in medical technology are the major drivers for the growth of the spinal implants market, with prevalence of spinal deformities such as arthritis, scoliosis, vertebral fractures, spondylolisthesis, and synovium (herniated disc) making the market The expanding demand, moreover, the growing number of geriatric population is driving the demand for spinal implants in the future. Since Boucher et al. applied pedicle screw technology in spinal fusion surgery in 1959, pedicle screw technology has been widely used in the treatment of spinal trauma, inflammation, tumor, deformity and degenerative diseases, and has achieved recognized good results. Because of its advantages of achieving three-column stability, providing immediate fixation for the spine, large orthopedic force, and...

AI Technical Summary

Problems solved by technology

[0004] Through the research on the existing technology, it is found that when the pedicle screw fixation device is placed during the operation, the operator often judges whether the screw head is locked by experience, and if the operator cannot quickly install the fixation rod after inserting the screw, or It is because the assembly and positioning between the fixation rod and the screw is too slow, which will inevitably prolong the operation time, consume more energy of the operator, and delay the postoperative recovery period of the patient.

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