A drill guide for drilling screw holes in bone fragments that are to be stabilized by means of a device composed of a compression plate and round-headed screws, the drill guide having a hollow outer cylinder and hollow inner cylinder, positioned so that the hollow inner cylinder can be slid axially within...http://www.google.es/patents/US5507801?utm_source=gb-gplus-sharePatente US5507801 - Compression drill guide
