The invention discloses an olecranal fracture fixator. The olecranal fracture fixator comprises an arc-shaped
tail end
nail plate, an expanding screw, and a
screw cap, wherein a through hole allowing the expanding screw to pass through is formed in the
tail end
nail plate, external threads matched with the
screw cap are arranged on the expanding screw, after the
screw cap is screwed to the expanding screw, the
tail end
nail plate tightly pushes against the olecroanon of an applied person, the expanding screw is a hollow
pipe and comprises an outer section with large outer
diameter and an inner section with small
diameter, a conical section is arranged between the outer section and the inner section, an American valve is arranged at the free end of the outer section, a tapered opening is arranged at the free end of the inner section, and at least one air outlet hole is formed in the side wall of the inner section; the olecranal fracture fixator further comprises a section of rubber hose, wherein one end of the rubber hose compresses and hoops the conical section through a sleeve with the inner bore taper being the same as the taper of the conical section, the other overturned end of the rubber hose is stuffed into the tapered opening, and a
plunger piston with the taper being the same as that of the tapered opening is adopted for stuffing up. The olecranal fracture fixator realizes fixing through air inflation expansion of the rubber hose, the flexibility of the acting force is adjustable, and the taking out is easy and convenient.