Atlantoaxial dislocation posterior repositor acting on screws and rods and provided with double movable arms

Abstract

The invention provides an atlantoaxial dislocation posterior repositor acting on screws and rods and provided with double movable arms. The atlantoaxial dislocation posterior repositor is characterized by comprising a clip-shaped limiting frame, the clip-shaped limiting frame has a first support and a second support, the middle intersection positions of the first support and the second support areconnected in a crossed manner, and a movable support arm for tightly pressing an axis screw and a fixing rod to play a push reposition role is arranged at the head end of the first support; a movablehook arm for tightly hooking an atlas screw and the fixing rod and capable of performing pull reposition is arranged at the head end of the second support; and the tail ends of the first support andthe second support are used as handle ends. During reposition, the repositor can realize reposition by applying force with a single arm or double arms, can provide extra reposition force, can controlthe reposition distance accurately, solves the problems of insufficient posterior reposition force, reposition operation difficulty and poor reposition effects in the prior art, and can also be used for reposition of other vertebra dislocation besides atlantoaxial dislocation.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a posterior reducer for atlantoaxial dislocation with double movable arms acting on nail rods. Background technique [0002] In the atlantoaxial, cervical, and lumbar vertebrae, when reduction is required due to dislocation or slippage, the posterior vertebral arch screw fixation rod reduction system is usually used. However, the above-mentioned vertebral body reduction through screw rod fixation mainly relies on screws. The lifting effect of the rod is used to achieve reset. Due to the limited lifting and reset force of the nail-rod system, it is often necessary to increase the pre-bending arc of the fixing rod to increase the reset force. However, repeated rod replacement operations are required to achieve a satisfactory reset, but this method is very difficult. It is difficult to precisely control the reset distance. In addition, even with repeated rod bending and rod changing,...

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a posterior resetter for atlantoaxial dislocation with double movable arms acting on nail rods, which solves the problems of posterior reset, difficult reset operation and poor reset effect in the prior art

Images