Expansive pedicle screw and revision fixation method

Abstract

The invention relates to a novel expansive pedicle screw and a revision and fixation method. The novel expansive pedicle screw is applicable to posterior spinal fixation of patients with osteoporosisand revision after traditional screw mobilization. The screw can complete revision through secondary reinforced fixation of bone cement under the condition that the screw is not taken out. The screw comprises a U-shaped tail part, a tail cap, a screw main body, a screw inner core, a push rod and bone cement, wherein the U-shaped tail part and the screw main body are connected in uniaxial orientedand multiaxial universal connection modes; and the screw inner core is designed into solid inner core and hollow inner core. According to different inner diameters of the hollow cylinder of the screw,the far end of the screwed can be expanded by placing an isometric solid inner core, so that the holding force of the screw can be improved. Even the screw is loosened in later period, the bone cement is injected into the hollow inner core to replace the solid inner core, and bone cement can be diffused through side holes of the screw and inner core, and the solid inner core is replaced before the bone cement is solidified to restore the stability of the screw. The method has the advantages of reducing operation difficulty, reducing wounds, accelerating postoperative recovery, cost conservation and the like.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a novel expandable pedicle screw and a revision fixation method. Background technique [0002] The pedicle screw technique is currently the most commonly used fixation method in spinal surgery. The powerful three-column fixation effect of pedicle screws provides a strong guarantee for restoring the physiological curvature, biomechanics and stability of the spine. It is widely used in the fields of lumbar degenerative diseases, spinal tumors, spinal infections, and spinal trauma. . However, with the aging process of our country, more and more people suffer from osteoporosis. At present, my country has become the country with the largest population of osteoporosis in the world. According to the latest statistics, there are more than 90 million osteoporosis patients in my country, among which female patients over 50 years old account for 50% of the total population. Oste...

AI Technical Summary

Problems solved by technology

Osteoporosis patients have decreased bone mineral density, decreased bone mass, and degeneration of bone structure, which lead to a significant decrease in the fixation effect of pedicle screws. After surgery, the risks of screw loosening, screw pullout, and loss of structural stability are significantly increased, and even lead to Internal fixation failure

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