Implantable vertebral expanding device

The invention discloses an implantable vertebral expanding device. The implantable vertebral expanding device comprises an injection pipe and a push rod, wherein the push rod penetrates through the injection pipe; the push rod can slide along the injection pipe; a spraying nozzle is arranged at the far end of the injection pipe; a first end of the spraying nozzle is detachably connected to the farend of the injection pipe; an inner cavity of the spraying nozzle is communicated with the inner cavity of the injection pipe; a balloon is arranged at the outer part of the spraying nozzle; the spraying nozzle is provided with at least one first through hole; the first through hole is communicated with the inner cavity of the spraying nozzle and the inner cavity of the balloon. The first end ofthe spraying nozzle is in thread connection with the far end of the injection pipe; a sealed head with a pre-set conical degree is arranged at a second end of the spraying nozzle. The implantable vertebral expanding device disclosed by the invention is simple in structure and easy to manufacture; leakage of bone cement can be alleviated when a compressed vertebra is expanded, and the vertebra canbe recovered and the height of the vertebra can be effectively kept.