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The utility model provides a developer with automatic positioning function preload ring grip machine, comprising a base, PLC controllers, pressure grip mechanism and advancing mechanism, the advancing mechanism includes rails, sliders, fixtures, motors and ball screws Vice bars, the slide is fixed on said base, said slider fixture fixedly connected to said top, bottom rails connected to the slide, the ball screw comprises a screw and a nut screwed the screw at one end and the motor output shaft fixing this with automatic

The utility model provides a vertebral body dilating saccule catheter. The vertebral body dilating saccule catheter comprises a saccule component, a protective sleeve, a handle component and a support wire component in the axial direction, wherein the saccule component comprises dual-cavity tubes, developing marks, a support wire, a saccule, a protective sleeve, and a spacing interface, wherein the developing marks are arranged in the