A surgical device, in particular for percutaneous osteoplastic surgery, for example vertebroplastic operations or the like, and/or for biopsy operations, includes at least a guide for injection of a therapeutic fluid into a bony part, for example a cementing fluid, a needle being slidable internally of said guide, which needle having a first end provided with a gripping knob, and a second end opposite the first end, the guide having a first end which defines an obliquely-shaped dispensing opening of the fluid internally of the bony part, and a second end which defines a loading opening of the fluid at the outside of the bony part, the second end including a grip exhibiting two wings having different shapes, such that the position and orientation of the oblique profile of the opening can be recognized.
